mattercontrol/MatterControlLib/DesignTools/Operations/Path/InflatePathObject3D.cs

/*
Copyright (c) 2018, Lars Brubaker, John Lewin
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
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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of the authors and should not be interpreted as representing official policies,
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*/

using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Threading.Tasks;
using ClipperLib;
using MatterHackers.Agg.UI;
using MatterHackers.Agg.VertexSource;
using MatterHackers.DataConverters2D;
using MatterHackers.DataConverters3D;
using MatterHackers.Localizations;
using MatterHackers.MatterControl.PartPreviewWindow;
using MatterHackers.PolygonMesh.Processors;
using MatterHackers.VectorMath;

namespace MatterHackers.MatterControl.DesignTools.Operations
{
	public enum ExpandStyles
	{
		Flat,
		Round,
		Sharp,
	}

    public class InflatePathObject3D : PathObject3D, IEditorDraw, IObject3DControlsProvider
    {
		public InflatePathObject3D()
		{
			Name = "Inflate Path".Localize();
		}

		[Description("The amount to expand the path lines.")]
		public DoubleOrExpression Inflate { get; set; } = .2;

		[EnumDisplay(Mode = EnumDisplayAttribute.PresentationMode.Buttons)]
		public ExpandStyles Style { get; set; } = ExpandStyles.Sharp;

        public override bool MeshIsSolidObject => false;
        
		public void AddObject3DControls(Object3DControlsLayer object3DControlsLayer)
		{
			object3DControlsLayer.AddControls(ControlTypes.Standard2D);
		}

		public override async void OnInvalidate(InvalidateArgs invalidateArgs)
		{
			if ((invalidateArgs.InvalidateType.HasFlag(InvalidateType.Children)
				|| invalidateArgs.InvalidateType.HasFlag(InvalidateType.Matrix)
				|| invalidateArgs.InvalidateType.HasFlag(InvalidateType.Path))
				&& invalidateArgs.Source != this
				&& !RebuildLocked)
			{
				await Rebuild();
			}
			else if ((invalidateArgs.InvalidateType.HasFlag(InvalidateType.Properties) && invalidateArgs.Source == this))
			{
				await Rebuild();
			}
			else if (Expressions.NeedRebuild(this, invalidateArgs))
			{
				await Rebuild();
			}
			else
			{
				base.OnInvalidate(invalidateArgs);
			}
		}

		public override Task Rebuild()
		{
			this.DebugDepth("Rebuild");
			using (RebuildLock())
			{
				InsetPath();
				// set the mesh to show the path
				this.Mesh = VertexStorage.Extrude(Constants.PathPolygonsHeight);
			}

			this.CancelAllParentBuilding();
			Parent?.Invalidate(new InvalidateArgs(this, InvalidateType.Path));
			return Task.CompletedTask;
		}

		private void InsetPath()
		{
			var path = this.CombinedVisibleChildrenPaths();
			if (path == null)
			{
				// clear our existing data
				VertexStorage = new VertexStorage();
				return;
			}

			VertexStorage = path.Offset(Inflate.Value(this), GetJoinType(Style));
		}

		public static JoinType GetJoinType(ExpandStyles style)
		{
			ClipperLib.JoinType joinType = JoinType.jtMiter;
			switch (style)
			{
				case ExpandStyles.Flat:
					joinType = JoinType.jtSquare;
					break;
				case ExpandStyles.Round:
					joinType = JoinType.jtRound;
					break;
			}

			return joinType;
		}
	}
}