mattercontrol/PartPreviewWindow/View3D/View3DWidget.cs

/*
Copyright (c) 2014, Lars Brubaker
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this
   list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

The views and conclusions contained in the software and documentation are those
of the authors and should not be interpreted as representing official policies,
either expressed or implied, of the FreeBSD Project.
*/
//#define DoBooleanTest

using MatterHackers.Agg;
using MatterHackers.Agg.Transform;
using MatterHackers.Agg.UI;
using MatterHackers.Agg.VertexSource;
using MatterHackers.Localizations;
using MatterHackers.MatterControl.CustomWidgets;
using MatterHackers.MatterControl.DataStorage;
using MatterHackers.MatterControl.PrinterCommunication;
using MatterHackers.MatterControl.PrintLibrary.Provider;
using MatterHackers.MatterControl.PrintQueue;
using MatterHackers.MatterControl.SlicerConfiguration;
using MatterHackers.MeshVisualizer;
using MatterHackers.PolygonMesh;
using MatterHackers.PolygonMesh.Processors;
using MatterHackers.RayTracer;
using MatterHackers.RayTracer.Traceable;
using MatterHackers.RenderOpenGl;
using MatterHackers.VectorMath;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Diagnostics;
using System.Globalization;
using System.IO;
using System.Threading;
using System.Threading.Tasks;

namespace MatterHackers.MatterControl.PartPreviewWindow
{
	public partial class View3DWidget : PartPreview3DWidget
	{
		internal HeightValueDisplay heightDisplay;
		private readonly int EditButtonHeight = 44;
		private Action afterSaveCallback = null;
		private Button applyScaleButton;
		private List<MeshGroup> asynchMeshGroups = new List<MeshGroup>();
		private List<ScaleRotateTranslate> asynchMeshGroupTransforms = new List<ScaleRotateTranslate>();
		private List<PlatingMeshGroupData> asynchPlatingDatas = new List<PlatingMeshGroupData>();
		private FlowLayoutWidget doEdittingButtonsContainer;
		private bool editorThatRequestedSave = false;
		private FlowLayoutWidget enterEditButtonsContainer;
		private CheckBox expandMaterialOptions;
		private CheckBox expandMirrorOptions;
		private CheckBox expandRotateOptions;
		private CheckBox expandScaleOptions;
		private CheckBox expandViewOptions;
		private ExportPrintItemWindow exportingWindow = null;
		private ObservableCollection<GuiWidget> extruderButtons = new ObservableCollection<GuiWidget>();
		private bool firstDraw = true;
		private bool hasDrawn = false;
		private FlowLayoutWidget materialOptionContainer;
		private List<PlatingMeshGroupData> MeshGroupExtraData;
		private MeshSelectInfo meshSelectInfo;
		private FlowLayoutWidget mirrorOptionContainer;
		private OpenMode openMode;
		private bool partHasBeenEdited = false;
		private List<string> pendingPartsToLoad = new List<string>();
		private PrintItemWrapper printItemWrapper;
		private ProgressControl processingProgressControl;
		private FlowLayoutWidget rotateOptionContainer;
		private SaveAsWindow saveAsWindow = null;
		private SplitButton saveButtons;
		private bool saveSucceded = true;
		private FlowLayoutWidget scaleOptionContainer;
		private MHNumberEdit scaleRatioControl;
		private EventHandler SelectionChanged;
		private RGBA_Bytes[] SelectionColors = new RGBA_Bytes[] { new RGBA_Bytes(131, 4, 66), new RGBA_Bytes(227, 31, 61), new RGBA_Bytes(255, 148, 1), new RGBA_Bytes(247, 224, 23), new RGBA_Bytes(143, 212, 1) };
		private EditableNumberDisplay[] sizeDisplay = new EditableNumberDisplay[3];
		private Stopwatch timeSinceLastSpin = new Stopwatch();
		private Stopwatch timeSinceReported = new Stopwatch();
		private Dictionary<string, List<GuiWidget>> transformControls = new Dictionary<string, List<GuiWidget>>();
		private Matrix4X4 transformOnMouseDown = Matrix4X4.Identity;
		private CheckBox uniformScale;
		private EventHandler unregisterEvents;

		private UpArrow3D upArrow;

		private bool viewIsInEditModePreLock = false;

		private FlowLayoutWidget viewOptionContainer;

		private bool wasInSelectMode = false;

		public View3DWidget(PrintItemWrapper printItemWrapper, Vector3 viewerVolume, Vector2 bedCenter, MeshViewerWidget.BedShape bedShape, WindowMode windowType, AutoRotate autoRotate, OpenMode openMode = OpenMode.Viewing)
		{
			this.openMode = openMode;
			this.windowType = windowType;
			allowAutoRotate = (autoRotate == AutoRotate.Enabled);
			autoRotating = allowAutoRotate;
			MeshGroupExtraData = new List<PlatingMeshGroupData>();
			MeshGroupExtraData.Add(new PlatingMeshGroupData());

			this.printItemWrapper = printItemWrapper;

			FlowLayoutWidget mainContainerTopToBottom = new FlowLayoutWidget(FlowDirection.TopToBottom);
			mainContainerTopToBottom.HAnchor = Agg.UI.HAnchor.Max_FitToChildren_ParentWidth;
			mainContainerTopToBottom.VAnchor = Agg.UI.VAnchor.Max_FitToChildren_ParentHeight;

			FlowLayoutWidget centerPartPreviewAndControls = new FlowLayoutWidget(FlowDirection.LeftToRight);
			centerPartPreviewAndControls.Name = "centerPartPreviewAndControls";
			centerPartPreviewAndControls.AnchorAll();

			GuiWidget viewArea = new GuiWidget();
			viewArea.AnchorAll();
			{
				meshViewerWidget = new MeshViewerWidget(viewerVolume, bedCenter, bedShape, "Press 'Add' to select an item.".Localize());

				PutOemImageOnBed();

				meshViewerWidget.AnchorAll();
			}
			viewArea.AddChild(meshViewerWidget);

			centerPartPreviewAndControls.AddChild(viewArea);
			mainContainerTopToBottom.AddChild(centerPartPreviewAndControls);

			FlowLayoutWidget buttonBottomPanel = new FlowLayoutWidget(FlowDirection.LeftToRight);
			buttonBottomPanel.HAnchor = HAnchor.ParentLeftRight;
			buttonBottomPanel.Padding = new BorderDouble(3, 3);
			buttonBottomPanel.BackgroundColor = ActiveTheme.Instance.PrimaryBackgroundColor;

			buttonRightPanel = CreateRightButtonPanel(viewerVolume.y);
			buttonRightPanel.Name = "buttonRightPanel";
			buttonRightPanel.Visible = false;

			CreateOptionsContent();

			// add in the plater tools
			{
				FlowLayoutWidget editToolBar = new FlowLayoutWidget();

				string progressFindPartsLabel = "Entering Editor".Localize();
				string progressFindPartsLabelFull = "{0}:".FormatWith(progressFindPartsLabel);

				processingProgressControl = new ProgressControl(progressFindPartsLabelFull, ActiveTheme.Instance.PrimaryTextColor, ActiveTheme.Instance.PrimaryAccentColor);
				processingProgressControl.VAnchor = Agg.UI.VAnchor.ParentCenter;
				editToolBar.AddChild(processingProgressControl);
				editToolBar.VAnchor |= Agg.UI.VAnchor.ParentCenter;
				processingProgressControl.Visible = false;

				// If the window is embeded (in the center pannel) and there is no item loaded then don't show the add button
				enterEditButtonsContainer = new FlowLayoutWidget();
				{
					Button addButton = textImageButtonFactory.Generate("Insert".Localize(), "icon_insert_32x32.png");
					addButton.ToolTipText = "Insert an .stl, .amf or .zip file".Localize();
					addButton.Margin = new BorderDouble(right: 0);
					enterEditButtonsContainer.AddChild(addButton);
					addButton.Click += (sender, e) =>
					{
						UiThread.RunOnIdle(() =>
						{
							DoAddFileAfterCreatingEditData = true;
							EnterEditAndCreateSelectionData();
						});
					};
					if (printItemWrapper != null
						&& printItemWrapper.PrintItem.ReadOnly)
					{
						addButton.Enabled = false;
					}

					Button enterEdittingButton = textImageButtonFactory.Generate("Edit".Localize(), "icon_edit_32x32.png");
					enterEdittingButton.Name = "3D View Edit";
					enterEdittingButton.Margin = new BorderDouble(right: 4);
					enterEdittingButton.Click += (sender, e) =>
					{
						EnterEditAndCreateSelectionData();
					};

					if (printItemWrapper != null
						&& printItemWrapper.PrintItem.ReadOnly)
					{
						enterEdittingButton.Enabled = false;
					}

					Button exportButton = textImageButtonFactory.Generate("Export...".Localize());
					if (printItemWrapper != null &&
						(printItemWrapper.PrintItem.Protected || printItemWrapper.PrintItem.ReadOnly))
					{
						exportButton.Enabled = false;
					}

					exportButton.Margin = new BorderDouble(right: 10);
					exportButton.Click += (sender, e) =>
					{
						UiThread.RunOnIdle(() =>
						{
							OpenExportWindow();
						});
					};

					enterEditButtonsContainer.AddChild(enterEdittingButton);
					enterEditButtonsContainer.AddChild(exportButton);
				}
				editToolBar.AddChild(enterEditButtonsContainer);

				doEdittingButtonsContainer = new FlowLayoutWidget();
				doEdittingButtonsContainer.Visible = false;

				{
					Button addButton = textImageButtonFactory.Generate("Insert".Localize(), "icon_insert_32x32.png");
					addButton.Margin = new BorderDouble(right: 10);
					doEdittingButtonsContainer.AddChild(addButton);
					addButton.Click += (sender, e) =>
					{
						UiThread.RunOnIdle(() =>
						{
							FileDialog.OpenFileDialog(
								new OpenFileDialogParams(ApplicationSettings.OpenDesignFileParams, multiSelect: true),
								(openParams) =>
								{
									LoadAndAddPartsToPlate(openParams.FileNames);
								});
						});
					};

					GuiWidget separator = new GuiWidget(1, 2);
					separator.BackgroundColor = ActiveTheme.Instance.PrimaryTextColor;
					separator.Margin = new BorderDouble(4, 2);
					separator.VAnchor = VAnchor.ParentBottomTop;
					doEdittingButtonsContainer.AddChild(separator);

					Button ungroupButton = textImageButtonFactory.Generate("Ungroup".Localize());
					doEdittingButtonsContainer.AddChild(ungroupButton);
					ungroupButton.Click += (sender, e) =>
					{
						UngroupSelectedMeshGroup();
					};

					Button groupButton = textImageButtonFactory.Generate("Group".Localize());
					doEdittingButtonsContainer.AddChild(groupButton);
					groupButton.Click += (sender, e) =>
					{
						GroupSelectedMeshs();
					};

					Button alignButton = textImageButtonFactory.Generate("Align".Localize());
					doEdittingButtonsContainer.AddChild(alignButton);
					alignButton.Click += (sender, e) =>
					{
						AlignToSelectedMeshGroup();
					};

					Button arrangeButton = textImageButtonFactory.Generate("Arrange".Localize());
					doEdittingButtonsContainer.AddChild(arrangeButton);
					arrangeButton.Click += (sender, e) =>
					{
						AutoArrangePartsInBackground();
					};

					GuiWidget separatorTwo = new GuiWidget(1, 2);
					separatorTwo.BackgroundColor = ActiveTheme.Instance.PrimaryTextColor;
					separatorTwo.Margin = new BorderDouble(4, 2);
					separatorTwo.VAnchor = VAnchor.ParentBottomTop;
					doEdittingButtonsContainer.AddChild(separatorTwo);

					Button copyButton = textImageButtonFactory.Generate("Copy".Localize());
					copyButton.Name = "3D View Copy";
					doEdittingButtonsContainer.AddChild(copyButton);
					copyButton.Click += (sender, e) =>
					{
						MakeCopyOfGroup();
					};

					Button deleteButton = textImageButtonFactory.Generate("Remove".Localize());
					deleteButton.Name = "3D View Delete";
					doEdittingButtonsContainer.AddChild(deleteButton);
					deleteButton.Click += (sender, e) =>
					{
						DeleteSelectedMesh();
					};

					GuiWidget separatorThree = new GuiWidget(1, 2);
					separatorThree.BackgroundColor = ActiveTheme.Instance.PrimaryTextColor;
					separatorThree.Margin = new BorderDouble(4, 1);
					separatorThree.VAnchor = VAnchor.ParentBottomTop;
					doEdittingButtonsContainer.AddChild(separatorThree);

					Button leaveEditModeButton = textImageButtonFactory.Generate("Cancel".Localize(), centerText: true);
					leaveEditModeButton.Click += (sender, e) =>
					{
						UiThread.RunOnIdle(() =>
						{
							if (saveButtons.Visible)
							{
								StyledMessageBox.ShowMessageBox(ExitEditingAndSaveIfRequired, "Would you like to save your changes before exiting the editor?", "Save Changes", StyledMessageBox.MessageType.YES_NO);
							}
							else
							{
								if (partHasBeenEdited)
								{
									ExitEditingAndSaveIfRequired(false);
								}
								else
								{
									SwitchStateToNotEditing();
								}
							}
						});
					};
					doEdittingButtonsContainer.AddChild(leaveEditModeButton);

					// put in the save button
					AddSaveAndSaveAs(doEdittingButtonsContainer);
				}

				KeyDown += (sender, e) =>
				{
					KeyEventArgs keyEvent = e as KeyEventArgs;
					if (keyEvent != null && !keyEvent.Handled)
					{
						if (keyEvent.KeyCode == Keys.Delete || keyEvent.KeyCode == Keys.Back)
						{
							DeleteSelectedMesh();
						}

						if (keyEvent.KeyCode == Keys.Escape)
						{
							if (meshSelectInfo.downOnPart)
							{
								meshSelectInfo.downOnPart = false;

								ScaleRotateTranslate translated = SelectedMeshGroupTransform;
								translated.translation = transformOnMouseDown;
								SelectedMeshGroupTransform = translated;

								Invalidate();
							}
						}
					}
				};

				editToolBar.AddChild(doEdittingButtonsContainer);
				buttonBottomPanel.AddChild(editToolBar);
			}

			GuiWidget buttonRightPanelHolder = new GuiWidget(HAnchor.FitToChildren, VAnchor.ParentBottomTop);
			buttonRightPanelHolder.Name = "buttonRightPanelHolder";
			centerPartPreviewAndControls.AddChild(buttonRightPanelHolder);
			buttonRightPanelHolder.AddChild(buttonRightPanel);
			buttonRightPanel.VisibleChanged += (sender, e) =>
			{
				buttonRightPanelHolder.Visible = buttonRightPanel.Visible;
			};

			viewControls3D = new ViewControls3D(meshViewerWidget);

			viewControls3D.ResetView += (sender, e) =>
			{
				SetDefaultView();
			};

			buttonRightPanelDisabledCover = new Cover(HAnchor.ParentLeftRight, VAnchor.ParentBottomTop);
			buttonRightPanelDisabledCover.BackgroundColor = new RGBA_Bytes(ActiveTheme.Instance.PrimaryBackgroundColor, 150);
			buttonRightPanelHolder.AddChild(buttonRightPanelDisabledCover);

			viewControls3D.PartSelectVisible = false;
			LockEditControls();

			GuiWidget leftRightSpacer = new GuiWidget();
			leftRightSpacer.HAnchor = HAnchor.ParentLeftRight;
			buttonBottomPanel.AddChild(leftRightSpacer);

			if (windowType == WindowMode.StandAlone)
			{
				Button closeButton = textImageButtonFactory.Generate("Close".Localize());
				buttonBottomPanel.AddChild(closeButton);
				closeButton.Click += (sender, e) =>
				{
					CloseOnIdle();
				};
			}

			mainContainerTopToBottom.AddChild(buttonBottomPanel);

			this.AddChild(mainContainerTopToBottom);
			this.AnchorAll();

			meshViewerWidget.TrackballTumbleWidget.TransformState = TrackBallController.MouseDownType.Rotation;
			AddChild(viewControls3D);

			AddHandlers();

			UiThread.RunOnIdle(AutoSpin);

			if (printItemWrapper == null && windowType == WindowMode.Embeded)
			{
				enterEditButtonsContainer.Visible = false;
			}

			if (windowType == WindowMode.Embeded)
			{
				PrinterConnectionAndCommunication.Instance.CommunicationStateChanged.RegisterEvent(SetEditControlsBasedOnPrinterState, ref unregisterEvents);
				if (windowType == WindowMode.Embeded)
				{
					// make sure we lock the controls if we are printing or paused
					switch (PrinterConnectionAndCommunication.Instance.CommunicationState)
					{
						case PrinterConnectionAndCommunication.CommunicationStates.Printing:
						case PrinterConnectionAndCommunication.CommunicationStates.Paused:
							LockEditControls();
							break;
					}
				}
			}

			ActiveTheme.Instance.ThemeChanged.RegisterEvent(ThemeChanged, ref unregisterEvents);

			upArrow = new UpArrow3D(this);
			heightDisplay = new HeightValueDisplay(this);
			heightDisplay.Visible = false;
			meshViewerWidget.interactionVolumes.Add(upArrow);

			// make sure the colors are set correctl
			ThemeChanged(this, null);

			saveButtons.VisibleChanged += (sender, e) =>
			{
				partHasBeenEdited = true;
			};

			SetDefaultView();

#if DoBooleanTest
            DrawBefore += CreateBooleanTestGeometry;
            DrawAfter += RemoveBooleanTestGeometry;
#endif
		}

#if DoBooleanTest
        MeshGroup booleanGroup;
        ScaleRotateTranslate groupTransform;
        Vector3 offset = new Vector3();
        Vector3 direction = new Vector3(.11, .12, .13);
        Vector3 centering = new Vector3(100, 100, 20);
        private void CreateBooleanTestGeometry(GuiWidget drawingWidget, DrawEventArgs e)
        {
            Mesh boxA = PlatonicSolids.CreateCube(40, 40, 40);
			//boxA.Triangulate();
            boxA.Translate(centering);
            Mesh boxB = PlatonicSolids.CreateCube(40, 40, 40);
			//boxB.Triangulate();

            for (int i = 0; i < 3; i++)
            {
                if (Math.Abs(direction[i] + offset[i]) > 10)
                {
                    direction[i] = -direction[i];
                }
            }
            offset += direction;

            boxB.Translate(offset + centering);

            booleanGroup = new MeshGroup();
            booleanGroup.Meshes.Add(PolygonMesh.Csg.CsgOperations.Union(boxA, boxB));
            meshViewerWidget.MeshGroups.Add(booleanGroup);

            groupTransform = ScaleRotateTranslate.Identity();
            meshViewerWidget.MeshGroupTransforms.Add(groupTransform);
        }

        private void RemoveBooleanTestGeometry(GuiWidget drawingWidget, DrawEventArgs e)
        {
            meshViewerWidget.MeshGroups.Remove(booleanGroup);
            meshViewerWidget.MeshGroupTransforms.Remove(groupTransform);
			UiThread.RunOnIdle(() => Invalidate(), 1.0 / 30.0);
        }
#endif

		public override void SetDefaultView()
		{
			meshViewerWidget.TrackballTumbleWidget.ZeroVelocity();
			meshViewerWidget.TrackballTumbleWidget.TrackBallController.Reset();
			meshViewerWidget.TrackballTumbleWidget.TrackBallController.Scale = .03;
			meshViewerWidget.TrackballTumbleWidget.TrackBallController.Translate(-new Vector3(ActiveSliceSettings.Instance.BedCenter));
			meshViewerWidget.TrackballTumbleWidget.TrackBallController.Rotate(Quaternion.FromEulerAngles(new Vector3(0, 0, MathHelper.Tau / 16)));
			meshViewerWidget.TrackballTumbleWidget.TrackBallController.Rotate(Quaternion.FromEulerAngles(new Vector3(-MathHelper.Tau * .19, 0, 0)));
		}

		public enum AutoRotate { Enabled, Disabled };

		public enum OpenMode { Viewing, Editing }

		public enum WindowMode { Embeded, StandAlone };

		private enum TraceInfoOpperation { DONT_COPY, DO_COPY };

		public bool DisplayAllValueData { get; set; }

		public bool HaveSelection
		{
			get { return MeshGroups.Count > 0 && SelectedMeshGroupIndex > -1; }
		}

		public List<MeshGroup> MeshGroups
		{
			get { return meshViewerWidget.MeshGroups; }
		}

		public List<ScaleRotateTranslate> MeshGroupTransforms
		{
			get { return meshViewerWidget.MeshGroupTransforms; }
		}

		public MeshGroup SelectedMeshGroup
		{
			get { return meshViewerWidget.SelectedMeshGroup; }
		}

		public int SelectedMeshGroupIndex
		{
			get
			{
				return meshViewerWidget.SelectedMeshGroupIndex;
			}
			set
			{
				if (value != SelectedMeshGroupIndex)
				{
					meshViewerWidget.SelectedMeshGroupIndex = value;
					if (SelectionChanged != null)
					{
						SelectionChanged(this, null);
					}
					Invalidate();
				}
			}
		}

		public ScaleRotateTranslate SelectedMeshGroupTransform
		{
			get { return meshViewerWidget.SelectedMeshGroupTransform; }
			set { meshViewerWidget.SelectedMeshGroupTransform = value; }
		}

		public WindowMode windowType { get; set; }
		private bool DoAddFileAfterCreatingEditData { get; set; }

		public override void OnClosed(EventArgs e)
		{
			if (unregisterEvents != null)
			{
				unregisterEvents(this, null);
			}

			base.OnClosed(e);
		}

		public override void OnDragDrop(FileDropEventArgs fileDropEventArgs)
		{
			if (AllowDragDrop())
			{
				pendingPartsToLoad.Clear();
				foreach (string droppedFileName in fileDropEventArgs.DroppedFiles)
				{
					string extension = Path.GetExtension(droppedFileName).ToLower();
					if (extension != "" && ApplicationSettings.OpenDesignFileParams.Contains(extension))
					{
						pendingPartsToLoad.Add(droppedFileName);
					}
				}

				if (pendingPartsToLoad.Count > 0)
				{
					bool enterEditModeBeforeAddingParts = enterEditButtonsContainer.Visible == true;
					if (enterEditModeBeforeAddingParts)
					{
						EnterEditAndCreateSelectionData();
					}
					else
					{
						LoadAndAddPartsToPlate(pendingPartsToLoad.ToArray());
					}
				}
			}

			base.OnDragDrop(fileDropEventArgs);
		}

		public override void OnDragEnter(FileDropEventArgs fileDropEventArgs)
		{
			if (AllowDragDrop())
			{
				foreach (string file in fileDropEventArgs.DroppedFiles)
				{
					string extension = Path.GetExtension(file).ToLower();
					if (extension != "" && ApplicationSettings.OpenDesignFileParams.Contains(extension))
					{
						fileDropEventArgs.AcceptDrop = true;
					}
				}
			}
			base.OnDragEnter(fileDropEventArgs);
		}

		public override void OnDragOver(FileDropEventArgs fileDropEventArgs)
		{
			if (AllowDragDrop())
			{
				foreach (string file in fileDropEventArgs.DroppedFiles)
				{
					string extension = Path.GetExtension(file).ToLower();
					if (extension != "" && ApplicationSettings.OpenDesignFileParams.Contains(extension))
					{
						fileDropEventArgs.AcceptDrop = true;
					}
				}
			}
			base.OnDragOver(fileDropEventArgs);
		}

		public override void OnDraw(Graphics2D graphics2D)
		{
			if (firstDraw)
			{
				ClearBedAndLoadPrintItemWrapper(printItemWrapper);
				firstDraw = false;
			}

			if (HaveSelection)
			{
				upArrow.SetPosition();
				heightDisplay.SetPosition();
			}

			hasDrawn = true;
			base.OnDraw(graphics2D);
			DrawStuffForSelectedPart(graphics2D);
		}

		private ViewControls3DButtons? activeButtonBeforeMouseOverride = null;
		private ViewControls3DButtons? activeButtonBeforeKeyOverride = null;

		public override void OnKeyDown(KeyEventArgs keyEvent)
		{
			if (activeButtonBeforeKeyOverride == null)
			{
				activeButtonBeforeKeyOverride = viewControls3D.ActiveButton;

				if (keyEvent.Alt)
				{
					viewControls3D.ActiveButton = ViewControls3DButtons.Rotate;
				}
				else if (keyEvent.Shift)
				{
					viewControls3D.ActiveButton = ViewControls3DButtons.Translate;
				}
				else if (keyEvent.Control)
				{
					viewControls3D.ActiveButton = ViewControls3DButtons.Scale;
				}
			}

			base.OnKeyDown(keyEvent);
		}

		public override void OnKeyUp(KeyEventArgs keyEvent)
		{
			if (activeButtonBeforeKeyOverride != null)
			{
				viewControls3D.ActiveButton = (ViewControls3DButtons)activeButtonBeforeKeyOverride;
				activeButtonBeforeKeyOverride = null;
			}

			base.OnKeyUp(keyEvent);
		}

		public override void OnMouseDown(MouseEventArgs mouseEvent)
		{
			// Show transform override
			if (activeButtonBeforeMouseOverride == null && mouseEvent.Button == MouseButtons.Right)
			{
				activeButtonBeforeMouseOverride = viewControls3D.ActiveButton;
				viewControls3D.ActiveButton = ViewControls3DButtons.Rotate;
			}
			else if (activeButtonBeforeMouseOverride == null && mouseEvent.Button == MouseButtons.Middle)
			{
				activeButtonBeforeMouseOverride = viewControls3D.ActiveButton;
				viewControls3D.ActiveButton = ViewControls3DButtons.Translate;
			}

			autoRotating = false;
			base.OnMouseDown(mouseEvent);
			if (meshViewerWidget.TrackballTumbleWidget.UnderMouseState == Agg.UI.UnderMouseState.FirstUnderMouse)
			{
				if (meshViewerWidget.TrackballTumbleWidget.TransformState == TrackBallController.MouseDownType.None
					&& mouseEvent.Button == MouseButtons.Left
					&& ModifierKeys != Keys.Shift
					&& ModifierKeys != Keys.Control
					&& ModifierKeys != Keys.Alt)
				{
					if (!meshViewerWidget.MouseDownOnInteractionVolume)
					{
						int meshGroupHitIndex;
						if (FindMeshGroupHitPosition(mouseEvent.Position, out meshGroupHitIndex))
						{
							meshSelectInfo.hitPlane = new PlaneShape(Vector3.UnitZ, meshSelectInfo.planeDownHitPos.z, null);
							SelectedMeshGroupIndex = meshGroupHitIndex;

							transformOnMouseDown = SelectedMeshGroupTransform.translation;

							Invalidate();
							meshSelectInfo.downOnPart = true;
						}
						else
						{
							SelectedMeshGroupIndex = -1;
						}

						UpdateSizeInfo();
					}
				}
			}
		}

		public override void OnMouseMove(MouseEventArgs mouseEvent)
		{
			if (meshViewerWidget.TrackballTumbleWidget.TransformState == TrackBallController.MouseDownType.None && meshSelectInfo.downOnPart)
			{
				Vector2 meshViewerWidgetScreenPosition = meshViewerWidget.TransformFromParentSpace(this, new Vector2(mouseEvent.X, mouseEvent.Y));
				Ray ray = meshViewerWidget.TrackballTumbleWidget.GetRayFromScreen(meshViewerWidgetScreenPosition);
				IntersectInfo info = meshSelectInfo.hitPlane.GetClosestIntersection(ray);
				if (info != null)
				{
					Vector3 delta = info.hitPosition - meshSelectInfo.planeDownHitPos;

					Matrix4X4 totalTransform = Matrix4X4.CreateTranslation(new Vector3(-meshSelectInfo.lastMoveDelta));
					totalTransform *= Matrix4X4.CreateTranslation(new Vector3(delta));
					meshSelectInfo.lastMoveDelta = delta;

					ScaleRotateTranslate translated = SelectedMeshGroupTransform;
					translated.translation *= totalTransform;
					SelectedMeshGroupTransform = translated;

					Invalidate();
				}
			}

			base.OnMouseMove(mouseEvent);
		}

		public override void OnMouseUp(MouseEventArgs mouseEvent)
		{
			if (meshViewerWidget.TrackballTumbleWidget.TransformState == TrackBallController.MouseDownType.None
				&& meshSelectInfo.downOnPart
				&& meshSelectInfo.lastMoveDelta != Vector3.Zero)
			{
				PartHasBeenChanged();
			}

			meshSelectInfo.downOnPart = false;

			if (activeButtonBeforeMouseOverride != null)
			{
				viewControls3D.ActiveButton = (ViewControls3DButtons)activeButtonBeforeMouseOverride;
				activeButtonBeforeMouseOverride = null;
			}

			base.OnMouseUp(mouseEvent);
		}

		public void PartHasBeenChanged()
		{
			saveButtons.Visible = true;
		}

		public void ThemeChanged(object sender, EventArgs e)
		{
			processingProgressControl.FillColor = ActiveTheme.Instance.PrimaryAccentColor;

			MeshViewerWidget.SetMaterialColor(1, ActiveTheme.Instance.PrimaryAccentColor);
		}

		private void AddHandlers()
		{
			expandViewOptions.CheckedStateChanged += expandViewOptions_CheckedStateChanged;
			expandMirrorOptions.CheckedStateChanged += expandMirrorOptions_CheckedStateChanged;
			if (expandMaterialOptions != null)
			{
				expandMaterialOptions.CheckedStateChanged += expandMaterialOptions_CheckedStateChanged;
			}
			expandRotateOptions.CheckedStateChanged += expandRotateOptions_CheckedStateChanged;
			expandScaleOptions.CheckedStateChanged += expandScaleOptions_CheckedStateChanged;

			SelectionChanged += SetApplyScaleVisability;
		}

		private void AddMaterialControls(FlowLayoutWidget buttonPanel)
		{
			extruderButtons.Clear();
			for (int extruderIndex = 0; extruderIndex < ActiveSliceSettings.Instance.ExtruderCount; extruderIndex++)
			{
				FlowLayoutWidget colorSelectionContainer = new FlowLayoutWidget(FlowDirection.LeftToRight);
				colorSelectionContainer.HAnchor = HAnchor.ParentLeftRight;
				colorSelectionContainer.Padding = new BorderDouble(5);

				string colorLabelText = "Material {0}".Localize().FormatWith(extruderIndex + 1);
				RadioButton extruderSelection = new RadioButton(colorLabelText, textColor: ActiveTheme.Instance.PrimaryTextColor);
				extruderButtons.Add(extruderSelection);
				extruderSelection.SiblingRadioButtonList = extruderButtons;
				colorSelectionContainer.AddChild(extruderSelection);
				colorSelectionContainer.AddChild(new HorizontalSpacer());
				int extruderIndexLocal = extruderIndex;
				extruderSelection.Click += (sender, e) =>
				{
					if (SelectedMeshGroupIndex != -1)
					{
						foreach (Mesh mesh in SelectedMeshGroup.Meshes)
						{
							MeshMaterialData material = MeshMaterialData.Get(mesh);
							if (material.MaterialIndex != extruderIndexLocal + 1)
							{
								material.MaterialIndex = extruderIndexLocal + 1;
								PartHasBeenChanged();
							}
						}
					}
				};

				this.SelectionChanged += (sender, e) =>
				{
					if (SelectedMeshGroup != null)
					{
						Mesh mesh = SelectedMeshGroup.Meshes[0];
						MeshMaterialData material = MeshMaterialData.Get(mesh);

						for (int i = 0; i < extruderButtons.Count; i++)
						{
							if (material.MaterialIndex - 1 == i)
							{
								((RadioButton)extruderButtons[i]).Checked = true;
							}
						}
					}
				};

				buttonPanel.AddChild(colorSelectionContainer);
			}
		}

		private void AddMirrorControls(FlowLayoutWidget buttonPanel)
		{
			List<GuiWidget> mirrorControls = new List<GuiWidget>();
			transformControls.Add("Mirror", mirrorControls);

			textImageButtonFactory.FixedWidth = EditButtonHeight;

			FlowLayoutWidget buttonContainer = new FlowLayoutWidget(FlowDirection.LeftToRight);
			buttonContainer.HAnchor = HAnchor.ParentLeftRight;

			Button mirrorXButton = textImageButtonFactory.Generate("X", centerText: true);
			buttonContainer.AddChild(mirrorXButton);
			mirrorControls.Add(mirrorXButton);
			mirrorXButton.Click += (object sender, EventArgs mouseEvent) =>
			{
				if (SelectedMeshGroupIndex != -1)
				{
					SelectedMeshGroup.ReverseFaceEdges();

					ScaleRotateTranslate scale = SelectedMeshGroupTransform;
					scale.scale *= Matrix4X4.CreateScale(-1, 1, 1);
					SelectedMeshGroupTransform = scale;

					PlatingHelper.PlaceMeshGroupOnBed(MeshGroups, MeshGroupTransforms, SelectedMeshGroupIndex);

					PartHasBeenChanged();
					Invalidate();
				}
			};

			Button mirrorYButton = textImageButtonFactory.Generate("Y", centerText: true);
			buttonContainer.AddChild(mirrorYButton);
			mirrorControls.Add(mirrorYButton);
			mirrorYButton.Click += (object sender, EventArgs mouseEvent) =>
			{
				if (SelectedMeshGroupIndex != -1)
				{
					SelectedMeshGroup.ReverseFaceEdges();

					ScaleRotateTranslate scale = SelectedMeshGroupTransform;
					scale.scale *= Matrix4X4.CreateScale(1, -1, 1);
					SelectedMeshGroupTransform = scale;

					PlatingHelper.PlaceMeshGroupOnBed(MeshGroups, MeshGroupTransforms, SelectedMeshGroupIndex);

					PartHasBeenChanged();
					Invalidate();
				}
			};

			Button mirrorZButton = textImageButtonFactory.Generate("Z", centerText: true);
			buttonContainer.AddChild(mirrorZButton);
			mirrorControls.Add(mirrorZButton);
			mirrorZButton.Click += (object sender, EventArgs mouseEvent) =>
			{
				if (SelectedMeshGroupIndex != -1)
				{
					SelectedMeshGroup.ReverseFaceEdges();

					ScaleRotateTranslate scale = SelectedMeshGroupTransform;
					scale.scale *= Matrix4X4.CreateScale(1, 1, -1);
					SelectedMeshGroupTransform = scale;

					PlatingHelper.PlaceMeshGroupOnBed(MeshGroups, MeshGroupTransforms, SelectedMeshGroupIndex);

					PartHasBeenChanged();
					Invalidate();
				}
			};
			buttonPanel.AddChild(buttonContainer);
			buttonPanel.AddChild(generateHorizontalRule());
			textImageButtonFactory.FixedWidth = 0;
		}

		private void AddRotateControls(FlowLayoutWidget buttonPanel)
		{
			List<GuiWidget> rotateControls = new List<GuiWidget>();
			transformControls.Add("Rotate".Localize(), rotateControls);

			textImageButtonFactory.FixedWidth = EditButtonHeight;

			FlowLayoutWidget degreesContainer = new FlowLayoutWidget(FlowDirection.LeftToRight);
			degreesContainer.HAnchor = HAnchor.ParentLeftRight;
			degreesContainer.Padding = new BorderDouble(5);

			string degreesLabelText = "Degrees".Localize();
			string degreesLabelTextFull = "{0}:".FormatWith(degreesLabelText);
			TextWidget degreesLabel = new TextWidget(degreesLabelText, textColor: ActiveTheme.Instance.PrimaryTextColor);
			degreesContainer.AddChild(degreesLabel);
			degreesContainer.AddChild(new HorizontalSpacer());

			MHNumberEdit degreesControl = new MHNumberEdit(45, pixelWidth: 40, allowNegatives: true, allowDecimals: true, increment: 5, minValue: -360, maxValue: 360);
			degreesControl.VAnchor = Agg.UI.VAnchor.ParentTop;
			degreesContainer.AddChild(degreesControl);
			rotateControls.Add(degreesControl);

			buttonPanel.AddChild(degreesContainer);

			FlowLayoutWidget rotateButtonContainer = new FlowLayoutWidget(FlowDirection.LeftToRight);
			rotateButtonContainer.HAnchor = HAnchor.ParentLeftRight;

			Button rotateXButton = textImageButtonFactory.Generate("", "icon_rotate_32x32.png");
			TextWidget centeredX = new TextWidget("X", pointSize: 10, textColor: ActiveTheme.Instance.PrimaryTextColor); centeredX.Margin = new BorderDouble(3, 0, 0, 0); centeredX.AnchorCenter(); rotateXButton.AddChild(centeredX);
			rotateButtonContainer.AddChild(rotateXButton);
			rotateControls.Add(rotateXButton);
			rotateXButton.Click += (object sender, EventArgs mouseEvent) =>
			{
				if (SelectedMeshGroupIndex != -1)
				{
					double radians = MathHelper.DegreesToRadians(degreesControl.ActuallNumberEdit.Value);
					// rotate it
					ScaleRotateTranslate rotated = SelectedMeshGroupTransform;
					rotated.rotation *= Matrix4X4.CreateRotationX(radians);
					SelectedMeshGroupTransform = rotated;

					PlatingHelper.PlaceMeshGroupOnBed(MeshGroups, MeshGroupTransforms, SelectedMeshGroupIndex);
					PartHasBeenChanged();
					Invalidate();
				}
			};

			Button rotateYButton = textImageButtonFactory.Generate("", "icon_rotate_32x32.png");
			TextWidget centeredY = new TextWidget("Y", pointSize: 10, textColor: ActiveTheme.Instance.PrimaryTextColor); centeredY.Margin = new BorderDouble(3, 0, 0, 0); centeredY.AnchorCenter(); rotateYButton.AddChild(centeredY);
			rotateButtonContainer.AddChild(rotateYButton);
			rotateControls.Add(rotateYButton);
			rotateYButton.Click += (object sender, EventArgs mouseEvent) =>
			{
				if (SelectedMeshGroupIndex != -1)
				{
					double radians = MathHelper.DegreesToRadians(degreesControl.ActuallNumberEdit.Value);
					// rotate it
					ScaleRotateTranslate rotated = SelectedMeshGroupTransform;
					rotated.rotation *= Matrix4X4.CreateRotationY(radians);
					SelectedMeshGroupTransform = rotated;
					PlatingHelper.PlaceMeshGroupOnBed(MeshGroups, MeshGroupTransforms, SelectedMeshGroupIndex);
					saveButtons.Visible = true;
					Invalidate();
				}
			};

			Button rotateZButton = textImageButtonFactory.Generate("", "icon_rotate_32x32.png");
			TextWidget centeredZ = new TextWidget("Z", pointSize: 10, textColor: ActiveTheme.Instance.PrimaryTextColor); centeredZ.Margin = new BorderDouble(3, 0, 0, 0); centeredZ.AnchorCenter(); rotateZButton.AddChild(centeredZ);
			rotateButtonContainer.AddChild(rotateZButton);
			rotateControls.Add(rotateZButton);
			rotateZButton.Click += (object sender, EventArgs mouseEvent) =>
			{
				if (SelectedMeshGroupIndex != -1)
				{
					double radians = MathHelper.DegreesToRadians(degreesControl.ActuallNumberEdit.Value);
					// rotate it
					ScaleRotateTranslate rotated = SelectedMeshGroupTransform;
					rotated.rotation *= Matrix4X4.CreateRotationZ(radians);
					SelectedMeshGroupTransform = rotated;

					PlatingHelper.PlaceMeshGroupOnBed(MeshGroups, MeshGroupTransforms, SelectedMeshGroupIndex);
					PartHasBeenChanged();
					Invalidate();
				}
			};

			buttonPanel.AddChild(rotateButtonContainer);

			Button layFlatButton = whiteButtonFactory.Generate("Align to Bed".Localize(), centerText: true);
			layFlatButton.Cursor = Cursors.Hand;
			buttonPanel.AddChild(layFlatButton);

			layFlatButton.Click += (object sender, EventArgs mouseEvent) =>
			{
				if (SelectedMeshGroupIndex != -1)
				{
					MakeLowestFaceFlat(SelectedMeshGroupIndex);

					PartHasBeenChanged();
					Invalidate();
				}
			};

			buttonPanel.AddChild(generateHorizontalRule());
			textImageButtonFactory.FixedWidth = 0;
		}

		private void AddSaveAndSaveAs(FlowLayoutWidget flowToAddTo)
		{
			TupleList<string, Func<bool>> buttonList = new TupleList<string, Func<bool>>();
			buttonList.Add("Save", () =>
			{
				MergeAndSavePartsToCurrentMeshFile();
				return true;
			});

			buttonList.Add("Save As", () =>
			{
				UiThread.RunOnIdle(OpenSaveAsWindow);
				return true;
			});

			SplitButtonFactory splitButtonFactory = new SplitButtonFactory();
			splitButtonFactory.FixedHeight = 40 * TextWidget.GlobalPointSizeScaleRatio;
			saveButtons = splitButtonFactory.Generate(buttonList, Direction.Up, imageName: "icon_save_32x32.png");
			saveButtons.Visible = false;

			saveButtons.Margin = new BorderDouble();
			saveButtons.VAnchor |= VAnchor.ParentCenter;

			flowToAddTo.AddChild(saveButtons);
		}

		private void AddScaleControls(FlowLayoutWidget buttonPanel)
		{
			List<GuiWidget> scaleControls = new List<GuiWidget>();
			transformControls.Add("Scale", scaleControls);

			// Put in the scale ratio edit field
			{
				FlowLayoutWidget scaleRatioContainer = new FlowLayoutWidget(FlowDirection.LeftToRight);
				scaleRatioContainer.HAnchor = HAnchor.ParentLeftRight;
				scaleRatioContainer.Padding = new BorderDouble(5);

				string scaleRatioLabelText = "Ratio".Localize();
				string scaleRatioLabelTextFull = "{0}:".FormatWith(scaleRatioLabelText);
				TextWidget scaleRatioLabel = new TextWidget(scaleRatioLabelTextFull, textColor: ActiveTheme.Instance.PrimaryTextColor);
				scaleRatioLabel.Margin = new BorderDouble(0, 0, 3, 0);
				scaleRatioLabel.VAnchor = VAnchor.ParentCenter;
				scaleRatioContainer.AddChild(scaleRatioLabel);

				scaleRatioContainer.AddChild(new HorizontalSpacer());

				scaleRatioControl = new MHNumberEdit(1, pixelWidth: 50 * TextWidget.GlobalPointSizeScaleRatio, allowDecimals: true, increment: .05);
				scaleRatioControl.SelectAllOnFocus = true;
				scaleRatioControl.VAnchor = VAnchor.ParentCenter;
				scaleRatioContainer.AddChild(scaleRatioControl);
				scaleRatioControl.ActuallNumberEdit.KeyPressed += (sender, e) =>
				{
					SetApplyScaleVisability(this, null);
				};

				scaleRatioControl.ActuallNumberEdit.KeyDown += (sender, e) =>
				{
					SetApplyScaleVisability(this, null);
				};

				scaleRatioControl.ActuallNumberEdit.EnterPressed += (object sender, KeyEventArgs keyEvent) =>
				{
					ApplyScaleFromEditField();
				};

				scaleRatioContainer.AddChild(CreateScaleDropDownMenu());

				buttonPanel.AddChild(scaleRatioContainer);

				scaleControls.Add(scaleRatioControl);
			}

			applyScaleButton = whiteButtonFactory.Generate("Apply Scale".Localize(), centerText: true);
			applyScaleButton.Visible = false;
			applyScaleButton.Cursor = Cursors.Hand;
			buttonPanel.AddChild(applyScaleButton);

			scaleControls.Add(applyScaleButton);
			applyScaleButton.Click += (object sender, EventArgs mouseEvent) =>
			{
				ApplyScaleFromEditField();
			};

			// add in the dimensions
			{
				buttonPanel.AddChild(createAxisScalingControl("x", 0));
				buttonPanel.AddChild(createAxisScalingControl("y", 1));
				buttonPanel.AddChild(createAxisScalingControl("z", 2));

				uniformScale = new CheckBox("Lock Ratio".Localize(), textColor: ActiveTheme.Instance.PrimaryTextColor);
				uniformScale.Checked = true;

				FlowLayoutWidget leftToRight = new FlowLayoutWidget();
				leftToRight.Padding = new BorderDouble(5, 3);

				leftToRight.AddChild(uniformScale);
				buttonPanel.AddChild(leftToRight);
			}

			buttonPanel.AddChild(generateHorizontalRule());
		}

		private bool AllowDragDrop()
		{
			if ((!enterEditButtonsContainer.Visible
				&& !doEdittingButtonsContainer.Visible)
				|| printItemWrapper == null || printItemWrapper.PrintItem.ReadOnly)
			{
				return false;
			}

			return true;
		}

		private void ApplyScaleFromEditField()
		{
			if (HaveSelection)
			{
				double scale = scaleRatioControl.ActuallNumberEdit.Value;
				if (scale > 0)
				{
					ScaleAxis(scale, 0);
					ScaleAxis(scale, 1);
					ScaleAxis(scale, 2);
				}
			}
		}

		private void AutoSpin()
		{
			if (!WidgetHasBeenClosed && autoRotating)
			{
				// add it back in to keep it running.
				UiThread.RunOnIdle(AutoSpin, .04);

				if ((!timeSinceLastSpin.IsRunning || timeSinceLastSpin.ElapsedMilliseconds > 50)
					&& hasDrawn)
				{
					hasDrawn = false;
					timeSinceLastSpin.Restart();

					Quaternion currentRotation = meshViewerWidget.TrackballTumbleWidget.TrackBallController.CurrentRotation.GetRotation();
					Quaternion invertedRotation = Quaternion.Invert(currentRotation);

					Quaternion rotateAboutZ = Quaternion.FromEulerAngles(new Vector3(0, 0, .01));
					rotateAboutZ = invertedRotation * rotateAboutZ * currentRotation;
					meshViewerWidget.TrackballTumbleWidget.TrackBallController.Rotate(rotateAboutZ);
					Invalidate();
				}
			}
		}

		private void ReportProgressChanged(double progress0To1, string processingState, out bool continueProcessing)
		{
			if (!timeSinceReported.IsRunning || timeSinceReported.ElapsedMilliseconds > 100
				|| processingState != processingProgressControl.ProgressMessage)
			{
				UiThread.RunOnIdle(() =>
				{
					processingProgressControl.RatioComplete = progress0To1;
					processingProgressControl.ProgressMessage = processingState;
				});
				timeSinceReported.Restart();
			}
			continueProcessing = true;
		}

		private void ClearBedAndLoadPrintItemWrapper(PrintItemWrapper printItemWrapper)
		{
			SwitchStateToNotEditing();

			MeshGroups.Clear();
			MeshGroupExtraData.Clear();
			MeshGroupTransforms.Clear();
			if (printItemWrapper != null)
			{
				// remove it first to make sure we don't double add it
				PrintItemWrapper.FileHasChanged.UnregisterEvent(ReloadMeshIfChangeExternaly, ref unregisterEvents);
				PrintItemWrapper.FileHasChanged.RegisterEvent(ReloadMeshIfChangeExternaly, ref unregisterEvents); ;

				// don't load the mesh until we get all the rest of the interface built
				meshViewerWidget.LoadDone += new EventHandler(meshViewerWidget_LoadDone);

				Vector2 bedCenter = new Vector2();
				MeshViewerWidget.CenterPartAfterLoad doCentering = MeshViewerWidget.CenterPartAfterLoad.DONT;

				if (ActiveSliceSettings.Instance != null
				&& ActiveSliceSettings.Instance.CenterOnBed())
				{
					doCentering = MeshViewerWidget.CenterPartAfterLoad.DO;
					bedCenter = ActiveSliceSettings.Instance.BedCenter;
				}

				meshViewerWidget.LoadMesh(printItemWrapper.FileLocation, doCentering, bedCenter);
			}

			partHasBeenEdited = false;
		}

		private GuiWidget createAxisScalingControl(string axis, int axisIndex)
		{
			FlowLayoutWidget leftToRight = new FlowLayoutWidget();
			leftToRight.Padding = new BorderDouble(5, 3);

			TextWidget sizeDescription = new TextWidget("{0}:".FormatWith(axis), textColor: ActiveTheme.Instance.PrimaryTextColor);
			sizeDescription.VAnchor = Agg.UI.VAnchor.ParentCenter;
			leftToRight.AddChild(sizeDescription);

			sizeDisplay[axisIndex] = new EditableNumberDisplay(textImageButtonFactory, "100", "1000.00");
			sizeDisplay[axisIndex].EditComplete += (sender, e) =>
			{
				if (HaveSelection)
				{
					SetNewModelSize(sizeDisplay[axisIndex].GetValue(), axisIndex);
					sizeDisplay[axisIndex].SetDisplayString("{0:0.00}".FormatWith(SelectedMeshGroup.GetAxisAlignedBoundingBox().Size[axisIndex]));
					UpdateSizeInfo();
				}
				else
				{
					sizeDisplay[axisIndex].SetDisplayString("---");
				}
			};

			leftToRight.AddChild(sizeDisplay[axisIndex]);

			return leftToRight;
		}

		private void CreateOptionsContent()
		{
			AddRotateControls(rotateOptionContainer);
			AddScaleControls(scaleOptionContainer);
		}

		private void CreateRenderTypeRadioButtons(FlowLayoutWidget viewOptionContainer)
		{
			string renderTypeString = UserSettings.Instance.get("defaultRenderSetting");
			if (renderTypeString == null)
			{
				if (ActiveTheme.Instance.DisplayMode == ActiveTheme.ApplicationDisplayType.Touchscreen)
				{
					renderTypeString = "Shaded";
				}
				else
				{
					renderTypeString = "Outlines";
				}
				UserSettings.Instance.set("defaultRenderSetting", renderTypeString);
			}
			RenderOpenGl.RenderTypes renderType;
			bool canParse = Enum.TryParse<RenderOpenGl.RenderTypes>(renderTypeString, out renderType);
			if (canParse)
			{
				meshViewerWidget.RenderType = renderType;
			}

			{
				RadioButton renderTypeShaded = new RadioButton("Shaded".Localize(), textColor: ActiveTheme.Instance.PrimaryTextColor);
				renderTypeShaded.Checked = (meshViewerWidget.RenderType == RenderTypes.Shaded);

				renderTypeShaded.CheckedStateChanged += (sender, e) =>
				{
					meshViewerWidget.RenderType = RenderTypes.Shaded;
					UserSettings.Instance.set("defaultRenderSetting", meshViewerWidget.RenderType.ToString());
				};
				viewOptionContainer.AddChild(renderTypeShaded);
			}

			{
				RadioButton renderTypeOutlines = new RadioButton("Outlines".Localize(), textColor: ActiveTheme.Instance.PrimaryTextColor);
				renderTypeOutlines.Checked = (meshViewerWidget.RenderType == RenderTypes.Outlines);
				renderTypeOutlines.CheckedStateChanged += (sender, e) =>
				{
					meshViewerWidget.RenderType = RenderTypes.Outlines;
					UserSettings.Instance.set("defaultRenderSetting", meshViewerWidget.RenderType.ToString());
				};
				viewOptionContainer.AddChild(renderTypeOutlines);
			}

			{
				RadioButton renderTypePolygons = new RadioButton("Polygons".Localize(), textColor: ActiveTheme.Instance.PrimaryTextColor);
				renderTypePolygons.Checked = (meshViewerWidget.RenderType == RenderTypes.Polygons);
				renderTypePolygons.CheckedStateChanged += (sender, e) =>
				{
					meshViewerWidget.RenderType = RenderTypes.Polygons;
					UserSettings.Instance.set("defaultRenderSetting", meshViewerWidget.RenderType.ToString());
				};
				viewOptionContainer.AddChild(renderTypePolygons);
			}
		}

		private FlowLayoutWidget CreateRightButtonPanel(double buildHeight)
		{
			FlowLayoutWidget buttonRightPanel = new FlowLayoutWidget(FlowDirection.TopToBottom);
			buttonRightPanel.Width = 200;
			{
				BorderDouble buttonMargin = new BorderDouble(top: 3);

				expandRotateOptions = expandMenuOptionFactory.GenerateCheckBoxButton("Rotate".Localize().ToUpper(), "icon_arrow_right_no_border_32x32.png", "icon_arrow_down_no_border_32x32.png");
				expandRotateOptions.Margin = new BorderDouble(bottom: 2);
				buttonRightPanel.AddChild(expandRotateOptions);

				rotateOptionContainer = new FlowLayoutWidget(FlowDirection.TopToBottom);
				rotateOptionContainer.HAnchor = HAnchor.ParentLeftRight;
				rotateOptionContainer.Visible = false;
				buttonRightPanel.AddChild(rotateOptionContainer);

				expandScaleOptions = expandMenuOptionFactory.GenerateCheckBoxButton("Scale".Localize().ToUpper(), "icon_arrow_right_no_border_32x32.png", "icon_arrow_down_no_border_32x32.png");
				expandScaleOptions.Margin = new BorderDouble(bottom: 2);
				buttonRightPanel.AddChild(expandScaleOptions);

				scaleOptionContainer = new FlowLayoutWidget(FlowDirection.TopToBottom);
				scaleOptionContainer.HAnchor = HAnchor.ParentLeftRight;
				scaleOptionContainer.Visible = false;
				buttonRightPanel.AddChild(scaleOptionContainer);

				// put in the mirror options
				{
					expandMirrorOptions = expandMenuOptionFactory.GenerateCheckBoxButton("Mirror".Localize().ToUpper(), "icon_arrow_right_no_border_32x32.png", "icon_arrow_down_no_border_32x32.png");
					expandMirrorOptions.Margin = new BorderDouble(bottom: 2);
					buttonRightPanel.AddChild(expandMirrorOptions);

					mirrorOptionContainer = new FlowLayoutWidget(FlowDirection.TopToBottom);
					mirrorOptionContainer.HAnchor = HAnchor.ParentLeftRight;
					mirrorOptionContainer.Visible = false;
					buttonRightPanel.AddChild(mirrorOptionContainer);

					AddMirrorControls(mirrorOptionContainer);
				}

				// put in the material options
				int numberOfExtruders = ActiveSliceSettings.Instance.ExtruderCount;

				expandMaterialOptions = expandMenuOptionFactory.GenerateCheckBoxButton("Materials".Localize().ToUpper(), "icon_arrow_right_no_border_32x32.png", "icon_arrow_down_no_border_32x32.png");
				expandMaterialOptions.Margin = new BorderDouble(bottom: 2);

				if (numberOfExtruders > 1)
				{
					buttonRightPanel.AddChild(expandMaterialOptions);

					materialOptionContainer = new FlowLayoutWidget(FlowDirection.TopToBottom);
					materialOptionContainer.HAnchor = HAnchor.ParentLeftRight;
					materialOptionContainer.Visible = false;

					buttonRightPanel.AddChild(materialOptionContainer);
					AddMaterialControls(materialOptionContainer);
				}

				// put in the view options
				{
					expandViewOptions = expandMenuOptionFactory.GenerateCheckBoxButton("Display".Localize().ToUpper(), "icon_arrow_right_no_border_32x32.png", "icon_arrow_down_no_border_32x32.png");
					expandViewOptions.Margin = new BorderDouble(bottom: 2);
					buttonRightPanel.AddChild(expandViewOptions);

					viewOptionContainer = new FlowLayoutWidget(FlowDirection.TopToBottom);
					viewOptionContainer.HAnchor = HAnchor.ParentLeftRight;
					viewOptionContainer.Padding = new BorderDouble(left: 4);
					viewOptionContainer.Visible = false;
					{
						CheckBox showBedCheckBox = new CheckBox("Show Print Bed".Localize(), textColor: ActiveTheme.Instance.PrimaryTextColor);
						showBedCheckBox.Checked = true;
						showBedCheckBox.CheckedStateChanged += (sender, e) =>
						{
							meshViewerWidget.RenderBed = showBedCheckBox.Checked;
						};
						viewOptionContainer.AddChild(showBedCheckBox);

						if (buildHeight > 0)
						{
							CheckBox showBuildVolumeCheckBox = new CheckBox("Show Print Area".Localize(), textColor: ActiveTheme.Instance.PrimaryTextColor);
							showBuildVolumeCheckBox.Checked = false;
							showBuildVolumeCheckBox.Margin = new BorderDouble(bottom: 5);
							showBuildVolumeCheckBox.CheckedStateChanged += (sender, e) =>
							{
								meshViewerWidget.RenderBuildVolume = showBuildVolumeCheckBox.Checked;
							};
							viewOptionContainer.AddChild(showBuildVolumeCheckBox);
						}

						if (ActiveTheme.Instance.IsTouchScreen)
						{
							UserSettings.Instance.set("defaultRenderSetting", RenderTypes.Shaded.ToString());
						}
						else
						{
							CreateRenderTypeRadioButtons(viewOptionContainer);
						}
					}
					buttonRightPanel.AddChild(viewOptionContainer);
				}

				GuiWidget verticalSpacer = new GuiWidget();
				verticalSpacer.VAnchor = VAnchor.ParentBottomTop;
				buttonRightPanel.AddChild(verticalSpacer);
			}

			buttonRightPanel.Padding = new BorderDouble(6, 6);
			buttonRightPanel.Margin = new BorderDouble(0, 1);
			buttonRightPanel.BackgroundColor = ActiveTheme.Instance.PrimaryBackgroundColor;
			buttonRightPanel.VAnchor = VAnchor.ParentBottomTop;

			return buttonRightPanel;
		}

		private DropDownMenu CreateScaleDropDownMenu()
		{
			DropDownMenu presetScaleMenu = new DropDownMenu("", Direction.Down);
			presetScaleMenu.NormalArrowColor = ActiveTheme.Instance.PrimaryTextColor;
			presetScaleMenu.HoverArrowColor = ActiveTheme.Instance.PrimaryTextColor;
			presetScaleMenu.MenuAsWideAsItems = false;
			presetScaleMenu.AlignToRightEdge = true;
			//presetScaleMenu.OpenOffset = new Vector2(-50, 0);
			presetScaleMenu.HAnchor = HAnchor.AbsolutePosition;
			presetScaleMenu.VAnchor = VAnchor.AbsolutePosition;
			presetScaleMenu.Width = 25;
			presetScaleMenu.Height = scaleRatioControl.Height + 2;

			presetScaleMenu.AddItem("mm to in (.0393)");
			presetScaleMenu.AddItem("in to mm (25.4)");
			presetScaleMenu.AddItem("mm to cm (.1)");
			presetScaleMenu.AddItem("cm to mm (10)");
			string resetLable = "reset".Localize();
			string resetLableFull = "{0} (1)".FormatWith(resetLable);
			presetScaleMenu.AddItem(resetLableFull);

			presetScaleMenu.SelectionChanged += (sender, e) =>
			{
				double scale = 1;
				switch (presetScaleMenu.SelectedIndex)
				{
					case 0:
						scale = 1.0 / 25.4;
						break;

					case 1:
						scale = 25.4;
						break;

					case 2:
						scale = .1;
						break;

					case 3:
						scale = 10;
						break;

					case 4:
						scale = 1;
						break;
				}

				scaleRatioControl.ActuallNumberEdit.Value = scale;
				ApplyScaleFromEditField();
			};

			return presetScaleMenu;
		}

		private void DeleteSelectedMesh()
		{
			// don't ever delete the last mesh
			if (SelectedMeshGroupIndex != -1
				&& MeshGroups.Count > 1)
			{
				MeshGroups.RemoveAt(SelectedMeshGroupIndex);
				MeshGroupExtraData.RemoveAt(SelectedMeshGroupIndex);
				MeshGroupTransforms.RemoveAt(SelectedMeshGroupIndex);
				SelectedMeshGroupIndex = Math.Min(SelectedMeshGroupIndex, MeshGroups.Count - 1);
				PartHasBeenChanged();
				Invalidate();
			}
		}

		private void DrawStuffForSelectedPart(Graphics2D graphics2D)
		{
			if (SelectedMeshGroup != null)
			{
				AxisAlignedBoundingBox selectedBounds = SelectedMeshGroup.GetAxisAlignedBoundingBox(SelectedMeshGroupTransform.TotalTransform);
				Vector3 boundsCenter = selectedBounds.Center;
				Vector3 centerTop = new Vector3(boundsCenter.x, boundsCenter.y, selectedBounds.maxXYZ.z);

				Vector2 centerTopScreenPosition = meshViewerWidget.TrackballTumbleWidget.GetScreenPosition(centerTop);
				centerTopScreenPosition = meshViewerWidget.TransformToParentSpace(this, centerTopScreenPosition);
				//graphics2D.Circle(screenPosition.x, screenPosition.y, 5, RGBA_Bytes.Cyan);

				PathStorage zArrow = new PathStorage();
				zArrow.MoveTo(-6, -2);
				zArrow.curve3(0, -4);
				zArrow.LineTo(6, -2);
				zArrow.LineTo(0, 12);
				zArrow.LineTo(-6, -2);

				VertexSourceApplyTransform translate = new VertexSourceApplyTransform(zArrow, Affine.NewTranslation(centerTopScreenPosition));

				//graphics2D.Render(translate, RGBA_Bytes.Black);
			}
		}

		private void ExitEditingAndSaveIfRequired(bool response)
		{
			if (response == true)
			{
				MergeAndSavePartsToCurrentMeshFile(SwitchStateToNotEditing);
			}
			else
			{
				SwitchStateToNotEditing();
				// and reload the part
				ClearBedAndLoadPrintItemWrapper(printItemWrapper);
			}
		}

		private void expandMaterialOptions_CheckedStateChanged(object sender, EventArgs e)
		{
			if (expandMaterialOptions.Checked == true)
			{
				expandScaleOptions.Checked = false;
				expandRotateOptions.Checked = false;
				expandViewOptions.Checked = false;
			}
			materialOptionContainer.Visible = expandMaterialOptions.Checked;
		}

		private void expandMirrorOptions_CheckedStateChanged(object sender, EventArgs e)
		{
			if (mirrorOptionContainer.Visible != expandMirrorOptions.Checked)
			{
				if (expandMirrorOptions.Checked == true)
				{
					expandScaleOptions.Checked = false;
					expandRotateOptions.Checked = false;
					expandViewOptions.Checked = false;
					expandMaterialOptions.Checked = false;
				}
				mirrorOptionContainer.Visible = expandMirrorOptions.Checked;
			}
		}

		private void expandRotateOptions_CheckedStateChanged(object sender, EventArgs e)
		{
			if (rotateOptionContainer.Visible != expandRotateOptions.Checked)
			{
				if (expandRotateOptions.Checked == true)
				{
					expandViewOptions.Checked = false;
					expandScaleOptions.Checked = false;
					expandMirrorOptions.Checked = false;
					expandMaterialOptions.Checked = false;
				}
				rotateOptionContainer.Visible = expandRotateOptions.Checked;
			}
		}

		private void expandScaleOptions_CheckedStateChanged(object sender, EventArgs e)
		{
			if (scaleOptionContainer.Visible != expandScaleOptions.Checked)
			{
				if (expandScaleOptions.Checked == true)
				{
					expandViewOptions.Checked = false;
					expandRotateOptions.Checked = false;
					expandMirrorOptions.Checked = false;
					expandMaterialOptions.Checked = false;
				}
				scaleOptionContainer.Visible = expandScaleOptions.Checked;
			}
		}

		private void expandViewOptions_CheckedStateChanged(object sender, EventArgs e)
		{
			if (viewOptionContainer.Visible != expandViewOptions.Checked)
			{
				if (expandViewOptions.Checked == true)
				{
					expandScaleOptions.Checked = false;
					expandRotateOptions.Checked = false;
					expandMirrorOptions.Checked = false;
					expandMaterialOptions.Checked = false;
				}
				viewOptionContainer.Visible = expandViewOptions.Checked;
			}
		}

		private bool FindMeshGroupHitPosition(Vector2 screenPosition, out int meshHitIndex)
		{
			meshHitIndex = 0;
			if (MeshGroupExtraData.Count == 0 || MeshGroupExtraData[0].meshTraceableData == null)
			{
				return false;
			}

			List<IPrimitive> mesheTraceables = new List<IPrimitive>();
			for (int i = 0; i < MeshGroupExtraData.Count; i++)
			{
				foreach (IPrimitive traceData in MeshGroupExtraData[i].meshTraceableData)
				{
					mesheTraceables.Add(new Transform(traceData, MeshGroupTransforms[i].TotalTransform));
				}
			}
			IPrimitive allObjects = BoundingVolumeHierarchy.CreateNewHierachy(mesheTraceables);

			Vector2 meshViewerWidgetScreenPosition = meshViewerWidget.TransformFromParentSpace(this, screenPosition);
			Ray ray = meshViewerWidget.TrackballTumbleWidget.GetRayFromScreen(meshViewerWidgetScreenPosition);
			IntersectInfo info = allObjects.GetClosestIntersection(ray);
			if (info != null)
			{
				meshSelectInfo.planeDownHitPos = info.hitPosition;
				meshSelectInfo.lastMoveDelta = new Vector3();

				for (int i = 0; i < MeshGroupExtraData.Count; i++)
				{
					List<IPrimitive> insideBounds = new List<IPrimitive>();
					foreach (IPrimitive traceData in MeshGroupExtraData[i].meshTraceableData)
					{
						traceData.GetContained(insideBounds, info.closestHitObject.GetAxisAlignedBoundingBox());
					}
					if (insideBounds.Contains(info.closestHitObject))
					{
						meshHitIndex = i;
						return true;
					}
				}
			}

			return false;
		}

		private GuiWidget generateHorizontalRule()
		{
			GuiWidget horizontalRule = new GuiWidget();
			horizontalRule.Height = 1;
			horizontalRule.Margin = new BorderDouble(0, 1, 0, 3);
			horizontalRule.HAnchor = HAnchor.ParentLeftRight;
			horizontalRule.BackgroundColor = new RGBA_Bytes(255, 255, 255, 200);
			return horizontalRule;
		}

		private async void LoadAndAddPartsToPlate(string[] filesToLoad)
		{
			if (MeshGroups.Count > 0 && filesToLoad != null && filesToLoad.Length > 0)
			{
				string loadingPartLabel = "Loading Parts".Localize();
				string loadingPartLabelFull = "{0}:".FormatWith(loadingPartLabel);
				processingProgressControl.ProcessType = loadingPartLabelFull;
				processingProgressControl.Visible = true;
				processingProgressControl.PercentComplete = 0;
				LockEditControls();

				PushMeshGroupDataToAsynchLists(TraceInfoOpperation.DO_COPY);

				await Task.Run(() => loadAndAddPartsToPlate(filesToLoad));

				if (WidgetHasBeenClosed)
				{
					return;
				}

				UnlockEditControls();
				PartHasBeenChanged();

				bool addingOnlyOneItem = asynchMeshGroups.Count == MeshGroups.Count + 1;

				if (MeshGroups.Count > 0)
				{
					PullMeshGroupDataFromAsynchLists();
					if (addingOnlyOneItem)
					{
						// if we are only adding one part to the plate set the selection to it
						SelectedMeshGroupIndex = asynchMeshGroups.Count - 1;
					}
				}
			}
		}

		private void loadAndAddPartsToPlate(string[] filesToLoadIncludingZips)
		{
			Thread.CurrentThread.CurrentCulture = CultureInfo.InvariantCulture;

			List<string> filesToLoad = new List<string>();
			if (filesToLoadIncludingZips != null && filesToLoadIncludingZips.Length > 0)
			{
				for (int i = 0; i < filesToLoadIncludingZips.Length; i++)
				{
					string loadedFileName = filesToLoadIncludingZips[i];
					string extension = Path.GetExtension(loadedFileName).ToUpper();
					if ((extension != "" && MeshFileIo.ValidFileExtensions().Contains(extension)))
					{
						filesToLoad.Add(loadedFileName);
					}
					else if (extension == ".ZIP")
					{
						ProjectFileHandler project = new ProjectFileHandler(null);
						List<PrintItem> partFiles = project.ImportFromProjectArchive(loadedFileName);
						if (partFiles != null)
						{
							foreach (PrintItem part in partFiles)
							{
								filesToLoad.Add(part.FileLocation);
							}
						}
					}
				}

				string progressMessage = "Loading Parts...".Localize();
				double ratioPerFile = 1.0 / filesToLoad.Count;
				double currentRatioDone = 0;
				for (int i = 0; i < filesToLoad.Count; i++)
				{
					string loadedFileName = filesToLoad[i];
					List<MeshGroup> loadedMeshGroups = MeshFileIo.Load(Path.GetFullPath(loadedFileName), (double progress0To1, string processingState, out bool continueProcessing) =>
					{
						continueProcessing = !this.WidgetHasBeenClosed;
						double ratioAvailable = (ratioPerFile * .5);
						double currentRatio = currentRatioDone + progress0To1 * ratioAvailable;
						ReportProgressChanged(currentRatio, progressMessage, out continueProcessing);
					});

					if (WidgetHasBeenClosed)
					{
						return;
					}
					if (loadedMeshGroups != null)
					{
						double ratioPerSubMesh = ratioPerFile / loadedMeshGroups.Count;
						double subMeshRatioDone = 0;

						for (int subMeshIndex = 0; subMeshIndex < loadedMeshGroups.Count; subMeshIndex++)
						{
							MeshGroup meshGroup = loadedMeshGroups[subMeshIndex];

							PlatingHelper.FindPositionForGroupAndAddToPlate(meshGroup, ScaleRotateTranslate.Identity(), asynchPlatingDatas, asynchMeshGroups, asynchMeshGroupTransforms);
							if (WidgetHasBeenClosed)
							{
								return;
							}
							PlatingHelper.CreateITraceableForMeshGroup(asynchPlatingDatas, asynchMeshGroups, asynchMeshGroups.Count - 1, (double progress0To1, string processingState, out bool continueProcessing) =>
							{
								continueProcessing = !this.WidgetHasBeenClosed;
								double ratioAvailable = (ratioPerFile * .5);
								//                    done outer loop  +  done this loop  +first 1/2 (load)+  this part * ratioAvailable
								double currentRatio = currentRatioDone + subMeshRatioDone + ratioAvailable + progress0To1 * ratioPerSubMesh;
								ReportProgressChanged(currentRatio, progressMessage, out continueProcessing);
							});

							subMeshRatioDone += ratioPerSubMesh;
						}
					}

					currentRatioDone += ratioPerFile;
				}
			}
		}

		private void LockEditControls()
		{
			viewIsInEditModePreLock = doEdittingButtonsContainer.Visible;
			enterEditButtonsContainer.Visible = false;
			doEdittingButtonsContainer.Visible = false;
			buttonRightPanelDisabledCover.Visible = true;
			if (viewControls3D.PartSelectVisible == true)
			{
				viewControls3D.PartSelectVisible = false;
				if (viewControls3D.ActiveButton == ViewControls3DButtons.PartSelect)
				{
					wasInSelectMode = true;
					viewControls3D.ActiveButton = ViewControls3DButtons.Rotate;
				}
			}
		}

		private void MakeLowestFaceFlat(int indexToLayFlat)
		{
			Vertex lowestVertex = MeshGroups[indexToLayFlat].Meshes[0].Vertices[0];
			Vector3 lowestVertexPosition = Vector3.Transform(lowestVertex.Position, MeshGroupTransforms[indexToLayFlat].rotation);
			Mesh meshToLayFlat = null;
			foreach (Mesh meshToCheck in MeshGroups[indexToLayFlat].Meshes)
			{
				// find the lowest point on the model
				for (int testIndex = 1; testIndex < meshToCheck.Vertices.Count; testIndex++)
				{
					Vertex vertex = meshToCheck.Vertices[testIndex];
					Vector3 vertexPosition = Vector3.Transform(vertex.Position, MeshGroupTransforms[indexToLayFlat].rotation);
					if (vertexPosition.z < lowestVertexPosition.z)
					{
						lowestVertex = meshToCheck.Vertices[testIndex];
						lowestVertexPosition = vertexPosition;
						meshToLayFlat = meshToCheck;
					}
				}
			}

			Face faceToLayFlat = null;
			double lowestAngleOfAnyFace = double.MaxValue;
			// Check all the faces that are connected to the lowest point to find out which one to lay flat.
			foreach (Face face in lowestVertex.ConnectedFaces())
			{
				double biggestAngleToFaceVertex = double.MinValue;
				foreach (Vertex faceVertex in face.Vertices())
				{
					if (faceVertex != lowestVertex)
					{
						Vector3 faceVertexPosition = Vector3.Transform(faceVertex.Position, MeshGroupTransforms[indexToLayFlat].rotation);
						Vector3 pointRelLowest = faceVertexPosition - lowestVertexPosition;
						double xLeg = new Vector2(pointRelLowest.x, pointRelLowest.y).Length;
						double yLeg = pointRelLowest.z;
						double angle = Math.Atan2(yLeg, xLeg);
						if (angle > biggestAngleToFaceVertex)
						{
							biggestAngleToFaceVertex = angle;
						}
					}
				}
				if (biggestAngleToFaceVertex < lowestAngleOfAnyFace)
				{
					lowestAngleOfAnyFace = biggestAngleToFaceVertex;
					faceToLayFlat = face;
				}
			}

			double maxDistFromLowestZ = 0;
			List<Vector3> faceVertexes = new List<Vector3>();
			foreach (Vertex vertex in faceToLayFlat.Vertices())
			{
				Vector3 vertexPosition = Vector3.Transform(vertex.Position, MeshGroupTransforms[indexToLayFlat].rotation);
				faceVertexes.Add(vertexPosition);
				maxDistFromLowestZ = Math.Max(maxDistFromLowestZ, vertexPosition.z - lowestVertexPosition.z);
			}

			if (maxDistFromLowestZ > .001)
			{
				Vector3 xPositive = (faceVertexes[1] - faceVertexes[0]).GetNormal();
				Vector3 yPositive = (faceVertexes[2] - faceVertexes[0]).GetNormal();
				Vector3 planeNormal = Vector3.Cross(xPositive, yPositive).GetNormal();

				// this code takes the minimum rotation required and looks much better.
				Quaternion rotation = new Quaternion(planeNormal, new Vector3(0, 0, -1));
				Matrix4X4 partLevelMatrix = Matrix4X4.CreateRotation(rotation);

				// rotate it
				ScaleRotateTranslate rotated = SelectedMeshGroupTransform;
				rotated.rotation *= partLevelMatrix;
				SelectedMeshGroupTransform = rotated;

				PlatingHelper.PlaceMeshGroupOnBed(MeshGroups, MeshGroupTransforms, SelectedMeshGroupIndex);

				PartHasBeenChanged();
				Invalidate();
			}
		}

		private void MergeAndSavePartsDoWork(SaveAsWindow.SaveAsReturnInfo returnInfo)
		{
			if (returnInfo != null)
			{
				PrintItem printItem = new PrintItem();
				printItem.Name = returnInfo.newName;
				printItem.FileLocation = Path.GetFullPath(returnInfo.fileNameAndPath);
				printItemWrapper = new PrintItemWrapper(printItem, returnInfo.destinationLibraryProvider.GetProviderLocator());
			}

			// we sent the data to the asynch lists but we will not pull it back out (only use it as a temp holder).
			PushMeshGroupDataToAsynchLists(TraceInfoOpperation.DO_COPY);

			Thread.CurrentThread.CurrentCulture = CultureInfo.InvariantCulture;
			try
			{
				// push all the transforms into the meshes
				for (int i = 0; i < asynchMeshGroups.Count; i++)
				{
					asynchMeshGroups[i].Transform(asynchMeshGroupTransforms[i].TotalTransform);

					bool continueProcessing;
					ReportProgressChanged((i + 1) * .4 / asynchMeshGroups.Count, "", out continueProcessing);
				}

				string[] metaData = { "Created By", "MatterControl", "BedPosition", "Absolute" };

				MeshOutputSettings outputInfo = new MeshOutputSettings(MeshOutputSettings.OutputType.Binary, metaData);
				if (Path.GetExtension(printItemWrapper.FileLocation).ToUpper() == ".STL")
				{
					printItemWrapper.FileLocation = Path.ChangeExtension(printItemWrapper.FileLocation, ".AMF");
				}

				MeshFileIo.Save(asynchMeshGroups, printItemWrapper.FileLocation, outputInfo, ReportProgressChanged);

				// Wait for a second to report the file changed to give the OS a chance to finish closing it.
				UiThread.RunOnIdle(printItemWrapper.ReportFileChange, 3);

				if (returnInfo != null
					&& returnInfo.destinationLibraryProvider != null)
				{
					// save this part to correct library provider
					LibraryProvider libraryToSaveTo = returnInfo.destinationLibraryProvider;
					if (libraryToSaveTo != null)
					{
						libraryToSaveTo.AddItem(printItemWrapper);
						libraryToSaveTo.Dispose();
					}
				}
				else // we have already save it and the library should pick it up
				{
				}

				saveSucceded = true;
			}
			catch (System.UnauthorizedAccessException e2)
			{
				Debug.Print(e2.Message);
				GuiWidget.BreakInDebugger();
				saveSucceded = false;
				UiThread.RunOnIdle(() =>
				{
					//Do something special when unauthorized?
					StyledMessageBox.ShowMessageBox(null, "Oops! Unable to save changes.", "Unable to save");
				});
			}
			catch (Exception e)
			{
				Debug.Print(e.Message);
				GuiWidget.BreakInDebugger();
				saveSucceded = false;
				UiThread.RunOnIdle(() =>
				{
					StyledMessageBox.ShowMessageBox(null, "Oops! Unable to save changes.", "Unable to save");
				});
			}
		}

		private void MergeAndSavePartsDoCompleted()
		{
			if (WidgetHasBeenClosed)
			{
				return;
			}
			UnlockEditControls();

			// NOTE: we do not pull the data back out of the asynch lists.
			if (saveSucceded)
			{
				saveButtons.Visible = false;
			}

			if (afterSaveCallback != null)
			{
				afterSaveCallback();
			}
		}

		private async void MergeAndSavePartsToCurrentMeshFile(Action eventToCallAfterSave = null)
		{
			editorThatRequestedSave = true;
			afterSaveCallback = eventToCallAfterSave;

			if (MeshGroups.Count > 0)
			{
				string progressSavingPartsLabel = "Saving".Localize();
				string progressSavingPartsLabelFull = "{0}:".FormatWith(progressSavingPartsLabel);
				processingProgressControl.ProcessType = progressSavingPartsLabelFull;
				processingProgressControl.Visible = true;
				processingProgressControl.PercentComplete = 0;
				LockEditControls();

				await Task.Run(() => MergeAndSavePartsDoWork(null));
				MergeAndSavePartsDoCompleted();
			}
		}

		private async void MergeAndSavePartsToNewMeshFile(SaveAsWindow.SaveAsReturnInfo returnInfo)
		{
			editorThatRequestedSave = true;
			if (MeshGroups.Count > 0)
			{
				string progressSavingPartsLabel = "Saving".Localize();
				string progressSavingPartsLabelFull = "{0}:".FormatWith(progressSavingPartsLabel);
				processingProgressControl.ProcessType = progressSavingPartsLabelFull;
				processingProgressControl.Visible = true;
				processingProgressControl.PercentComplete = 0;
				LockEditControls();

				await Task.Run(() => MergeAndSavePartsDoWork(returnInfo));
				MergeAndSavePartsDoCompleted();
			}
		}

		private void meshViewerWidget_LoadDone(object sender, EventArgs e)
		{
			if (windowType == WindowMode.Embeded)
			{
				switch (PrinterConnectionAndCommunication.Instance.CommunicationState)
				{
					case PrinterConnectionAndCommunication.CommunicationStates.Printing:
					case PrinterConnectionAndCommunication.CommunicationStates.Paused:
						break;

					default:
						UnlockEditControls();
						break;
				}
			}
			else
			{
				UnlockEditControls();
			}

			SelectionChanged(this, null);

			if (openMode == OpenMode.Editing)
			{
				UiThread.RunOnIdle(EnterEditAndCreateSelectionData);
			}

			SetDefaultView();
		}

		private bool PartsAreInPrintVolume()
		{
			if (ActiveSliceSettings.Instance != null
				&& !ActiveSliceSettings.Instance.CenterOnBed()
				&& ActivePrinterProfile.Instance.ActivePrinter != null)
			{
				AxisAlignedBoundingBox allBounds = MeshViewerWidget.GetAxisAlignedBoundingBox(MeshGroups);
				bool onBed = allBounds.minXYZ.z > -.001 && allBounds.minXYZ.z < .001; // really close to the bed
				RectangleDouble bedRect = new RectangleDouble(0, 0, ActiveSliceSettings.Instance.BedSize.x, ActiveSliceSettings.Instance.BedSize.y);
				bedRect.Offset(ActiveSliceSettings.Instance.BedCenter - ActiveSliceSettings.Instance.BedSize / 2);

				bool inBounds = bedRect.Contains(new Vector2(allBounds.minXYZ)) && bedRect.Contains(new Vector2(allBounds.maxXYZ));

				return onBed && inBounds;
			}

			return true;
		}

		private void OpenExportWindow()
		{
			if (exportingWindow == null)
			{
				exportingWindow = new ExportPrintItemWindow(this.printItemWrapper);
				exportingWindow.Closed += (sender, e) =>
				{
					exportingWindow = null;
				};
				exportingWindow.ShowAsSystemWindow();
			}
			else
			{
				exportingWindow.BringToFront();
			}
		}

		private void OpenSaveAsWindow()
		{
			if (saveAsWindow == null)
			{
				List<ProviderLocatorNode> providerLocator = null;
				if (printItemWrapper.SourceLibraryProviderLocator != null)
				{
					providerLocator = printItemWrapper.SourceLibraryProviderLocator;
				}
				saveAsWindow = new SaveAsWindow(MergeAndSavePartsToNewMeshFile, providerLocator, true, true);
				saveAsWindow.Closed += new EventHandler(SaveAsWindow_Closed);
			}
			else
			{
				saveAsWindow.BringToFront();
			}
		}

		private void PullMeshGroupDataFromAsynchLists()
		{
			if (MeshGroups.Count != asynchMeshGroups.Count)
			{
				PartHasBeenChanged();
			}

			MeshGroups.Clear();
			foreach (MeshGroup meshGroup in asynchMeshGroups)
			{
				MeshGroups.Add(meshGroup);
			}
			MeshGroupTransforms.Clear();
			foreach (ScaleRotateTranslate transform in asynchMeshGroupTransforms)
			{
				MeshGroupTransforms.Add(transform);
			}
			MeshGroupExtraData.Clear();
			foreach (PlatingMeshGroupData meshData in asynchPlatingDatas)
			{
				MeshGroupExtraData.Add(meshData);
			}

			if (MeshGroups.Count != MeshGroupTransforms.Count
				|| MeshGroups.Count != MeshGroupExtraData.Count)
			{
				throw new Exception("These all need to remain in sync.");
			}
		}

		private void PushMeshGroupDataToAsynchLists(TraceInfoOpperation traceInfoOpperation, ReportProgressRatio reportProgress = null)
		{
			UiThread.RunOnIdle(() =>
			{
				processingProgressControl.ProgressMessage = "Async Copy";
			});
			asynchMeshGroups.Clear();
			asynchMeshGroupTransforms.Clear();
			for (int meshGroupIndex = 0; meshGroupIndex < MeshGroups.Count; meshGroupIndex++)
			{
				MeshGroup meshGroup = MeshGroups[meshGroupIndex];
				MeshGroup newMeshGroup = new MeshGroup();
				for (int meshIndex = 0; meshIndex < meshGroup.Meshes.Count; meshIndex++)
				{
					Mesh mesh = meshGroup.Meshes[meshIndex];
					newMeshGroup.Meshes.Add(Mesh.Copy(mesh));
				}
				asynchMeshGroups.Add(newMeshGroup);
				asynchMeshGroupTransforms.Add(MeshGroupTransforms[meshGroupIndex]);
			}
			asynchPlatingDatas.Clear();

			for (int meshGroupIndex = 0; meshGroupIndex < MeshGroupExtraData.Count; meshGroupIndex++)
			{
				PlatingMeshGroupData meshData = new PlatingMeshGroupData();
				meshData.currentScale = MeshGroupExtraData[meshGroupIndex].currentScale;
				MeshGroup meshGroup = MeshGroups[meshGroupIndex];

				if (traceInfoOpperation == TraceInfoOpperation.DO_COPY)
				{
					meshData.meshTraceableData.AddRange(MeshGroupExtraData[meshGroupIndex].meshTraceableData);
				}

				asynchPlatingDatas.Add(meshData);
			}
			UiThread.RunOnIdle(() =>
			{
				processingProgressControl.ProgressMessage = "";
			});
		}

		private void ReloadMeshIfChangeExternaly(Object sender, EventArgs e)
		{
			PrintItemWrapper senderItem = sender as PrintItemWrapper;
			if (senderItem != null
				&& senderItem.FileLocation == printItemWrapper.FileLocation)
			{
				if (!editorThatRequestedSave)
				{
					ClearBedAndLoadPrintItemWrapper(printItemWrapper);
				}

				editorThatRequestedSave = false;
			}
		}

		private bool rotateQueueMenu_Click()
		{
			return true;
		}

		private void SaveAsWindow_Closed(object sender, EventArgs e)
		{
			this.saveAsWindow = null;
		}

		private void ScaleAxis(double scaleIn, int axis)
		{
			AxisAlignedBoundingBox originalMeshBounds = SelectedMeshGroup.GetAxisAlignedBoundingBox();

			AxisAlignedBoundingBox totalMeshBounds = SelectedMeshGroup.GetAxisAlignedBoundingBox(SelectedMeshGroupTransform.TotalTransform);

			AxisAlignedBoundingBox scaledBounds = SelectedMeshGroup.GetAxisAlignedBoundingBox(SelectedMeshGroupTransform.scale);

			// first we remove any scale we have applied and then scale to the new value
			Vector3 axisRemoveScalings = new Vector3();
			axisRemoveScalings.x = scaledBounds.Size.x / originalMeshBounds.Size.x;
			axisRemoveScalings.y = scaledBounds.Size.y / originalMeshBounds.Size.y;
			axisRemoveScalings.z = scaledBounds.Size.z / originalMeshBounds.Size.z;

			Matrix4X4 removeScaleMatrix = Matrix4X4.CreateScale(1 / axisRemoveScalings);

			Vector3 newScale = MeshGroupExtraData[SelectedMeshGroupIndex].currentScale;
			newScale[axis] = scaleIn;
			Matrix4X4 totalScale = removeScaleMatrix * Matrix4X4.CreateScale(newScale);

			ScaleRotateTranslate scale = SelectedMeshGroupTransform;
			scale.scale *= totalScale;
			SelectedMeshGroupTransform = scale;

			// And make sure its center has not changed
			AxisAlignedBoundingBox postScaleBounds = SelectedMeshGroup.GetAxisAlignedBoundingBox(SelectedMeshGroupTransform.TotalTransform);
			ScaleRotateTranslate translation = SelectedMeshGroupTransform;
			translation.translation *= Matrix4X4.CreateTranslation(totalMeshBounds.Center - postScaleBounds.Center);
			SelectedMeshGroupTransform = translation;

			PlatingHelper.PlaceMeshGroupOnBed(MeshGroups, MeshGroupTransforms, SelectedMeshGroupIndex);

			PartHasBeenChanged();
			Invalidate();
			MeshGroupExtraData[SelectedMeshGroupIndex].currentScale[axis] = scaleIn;
			SetApplyScaleVisability(this, null);
		}

		private bool scaleQueueMenu_Click()
		{
			return true;
		}

		private void SetApplyScaleVisability(Object sender, EventArgs e)
		{
			if (HaveSelection)
			{
				double scale = scaleRatioControl.ActuallNumberEdit.Value;
				if (scale != MeshGroupExtraData[SelectedMeshGroupIndex].currentScale[0]
					|| scale != MeshGroupExtraData[SelectedMeshGroupIndex].currentScale[1]
					|| scale != MeshGroupExtraData[SelectedMeshGroupIndex].currentScale[2])
				{
					applyScaleButton.Visible = true;
				}
				else
				{
					applyScaleButton.Visible = false;
				}
			}

			UpdateSizeInfo();
		}

		private void SetEditControlsBasedOnPrinterState(object sender, EventArgs e)
		{
			if (windowType == WindowMode.Embeded)
			{
				switch (PrinterConnectionAndCommunication.Instance.CommunicationState)
				{
					case PrinterConnectionAndCommunication.CommunicationStates.Printing:
					case PrinterConnectionAndCommunication.CommunicationStates.Paused:
						LockEditControls();
						break;

					default:
						UnlockEditControls();
						break;
				}
			}
		}

		private void SetNewModelSize(double sizeInMm, int axis)
		{
			if (HaveSelection)
			{
				// because we remove any current scale before we change to a new one we only get the size of the base mesh data
				AxisAlignedBoundingBox originalMeshBounds = SelectedMeshGroup.GetAxisAlignedBoundingBox();

				double currentSize = originalMeshBounds.Size[axis];
				double desiredSize = sizeDisplay[axis].GetValue();
				double scaleFactor = 1;
				if (currentSize != 0)
				{
					scaleFactor = desiredSize / currentSize;
				}

				if (uniformScale.Checked)
				{
					scaleRatioControl.ActuallNumberEdit.Value = scaleFactor;
					ApplyScaleFromEditField();
				}
				else
				{
					ScaleAxis(scaleFactor, axis);
				}
			}
		}

		private void SwitchStateToNotEditing()
		{
			if (!enterEditButtonsContainer.Visible)
			{
				enterEditButtonsContainer.Visible = true;
				processingProgressControl.Visible = false;
				buttonRightPanel.Visible = false;
				doEdittingButtonsContainer.Visible = false;
				viewControls3D.PartSelectVisible = false;
				if (viewControls3D.ActiveButton == ViewControls3DButtons.PartSelect)
				{
					viewControls3D.ActiveButton = ViewControls3DButtons.Rotate;
				}
				SelectedMeshGroupIndex = -1;
			}
		}

		private void UnlockEditControls()
		{
			buttonRightPanelDisabledCover.Visible = false;
			processingProgressControl.Visible = false;

			if (viewIsInEditModePreLock)
			{
				if (!enterEditButtonsContainer.Visible)
				{
					viewControls3D.PartSelectVisible = true;
					doEdittingButtonsContainer.Visible = true;
				}
			}
			else
			{
				enterEditButtonsContainer.Visible = true;
			}

			if (wasInSelectMode)
			{
				viewControls3D.ActiveButton = ViewControls3DButtons.PartSelect;
				wasInSelectMode = false;
			}

			UpdateSizeInfo();
		}

		private void UpdateSizeInfo()
		{
			if (sizeDisplay[0] != null
				&& SelectedMeshGroup != null)
			{
				AxisAlignedBoundingBox bounds = SelectedMeshGroup.GetAxisAlignedBoundingBox(SelectedMeshGroupTransform.scale);
				sizeDisplay[0].SetDisplayString("{0:0.00}".FormatWith(bounds.Size[0]));
				sizeDisplay[1].SetDisplayString("{0:0.00}".FormatWith(bounds.Size[1]));
				sizeDisplay[2].SetDisplayString("{0:0.00}".FormatWith(bounds.Size[2]));
			}
			else
			{
				sizeDisplay[0].SetDisplayString("---");
				sizeDisplay[1].SetDisplayString("---");
				sizeDisplay[2].SetDisplayString("---");
			}
		}

		internal struct MeshSelectInfo
		{
			internal bool downOnPart;
			internal PlaneShape hitPlane;
			internal Vector3 lastMoveDelta;
			internal Vector3 planeDownHitPos;
		}
	}
}