mattercontrol/MatterControlLib/DesignTools/Operations/DecimateObject3D.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.
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   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
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*/

using System;
using System.ComponentModel;
using System.Threading.Tasks;
using g3;
using MatterHackers.Agg;
using MatterHackers.Agg.UI;
using MatterHackers.DataConverters3D;
using MatterHackers.Localizations;
using MatterHackers.MatterControl.DesignTools.Operations;
using MatterHackers.PolygonMesh;
using MatterHackers.PolygonMesh.Processors;

namespace MatterHackers.MatterControl.DesignTools
{
	public class DecimateObject3D : OperationSourceContainerObject3D, IPropertyGridModifier
	{
		public DecimateObject3D()
		{
			Name = "Reduce".Localize();
		}

		public enum ReductionMode
		{
			[EnumName("Count")]
			Polygon_Count,
			[EnumName("Percent")]
			Polygon_Percent
		}

		public override bool Persistable => ApplicationController.Instance.UserHasPermission(this);

		[EnumDisplay(Mode = EnumDisplayAttribute.PresentationMode.Buttons)]
		public ReductionMode Mode { get; set; } = ReductionMode.Polygon_Percent;

		[ReadOnly(true)]
		[Description("The original number of polygons.")]
		public int SourcePolygonCount
		{
			get
			{
				var total = 0;
				foreach (var sourceItem in SourceContainer.VisibleMeshes())
				{
					total += sourceItem.Mesh.Faces.Count;
				}

				return total;
			}

			set
			{
			}
		}

		[Description("The target number of polygons.")]
		public int TargetCount { get; set; } = -1;

		[Description("The percentage of polygons to keep.")]
		public double TargetPercent { get; set; } = 50;

		[Description("Ensure that each reduced point is on the surface of the original mesh. This is not normally required and slows the computation significantly.")]
		public bool MaintainSurface { get; set; } = false;

		[ReadOnly(true)]
		[Description("The number of polygons determined by the percentage reduction.")]
		[DisplayName("Final Count")]
		public int CountAfterPercentReduction
		{
			get
			{
				return TargetCount;
			}

			set
			{
			}
		}

		public Mesh Reduce(Mesh inMesh, int targetCount)
		{
			var mesh = inMesh.ToDMesh3();
			var reducer = new Reducer(mesh);

			if (MaintainSurface)
			{
				var tree = new DMeshAABBTree3(new DMesh3(mesh));
				tree.Build();
				var target = new MeshProjectionTarget(tree.Mesh, tree);
				reducer.SetProjectionTarget(target);
				reducer.ProjectionMode = Reducer.TargetProjectionMode.Inline;
			}

			reducer.ReduceToTriangleCount(Math.Max(4, targetCount));

			return reducer.Mesh.ToMesh();
		}

		public override Task Rebuild()
		{
			this.DebugDepth("Rebuild");

			var rebuildLocks = this.RebuilLockAll();

			var valuesChanged = false;

			// check if we have be initialized
			if (Mode == ReductionMode.Polygon_Count)
			{
				TargetCount = agg_basics.Clamp(TargetCount, 4, SourcePolygonCount, ref valuesChanged);
				TargetPercent = TargetCount / (double)SourcePolygonCount * 100;
			}
			else
			{
				TargetPercent = agg_basics.Clamp(TargetPercent, 0, 100, ref valuesChanged);
				TargetCount = (int)(SourcePolygonCount * TargetPercent / 100);
			}

			return TaskBuilder(
				"Reduce".Localize(),
				(reporter, cancellationToken) =>
				{
					SourceContainer.Visible = true;
					RemoveAllButSource();

					foreach (var sourceItem in SourceContainer.VisibleMeshes())
					{
						var originalMesh = sourceItem.Mesh;
						var targetCount = (int)(originalMesh.Faces.Count * TargetPercent / 100);
						var reducedMesh = Reduce(originalMesh, targetCount);

						var newMesh = new Object3D()
						{
							Mesh = reducedMesh,
							OwnerID = sourceItem.ID
						};
						newMesh.CopyProperties(sourceItem, Object3DPropertyFlags.All);
						this.Children.Add(newMesh);
					}

					SourceContainer.Visible = false;

					UiThread.RunOnIdle(() =>
					{
						rebuildLocks.Dispose();
						Invalidate(InvalidateType.DisplayValues);
						this.CancelAllParentBuilding();
						Parent?.Invalidate(new InvalidateArgs(this, InvalidateType.Children));
					});

					return Task.CompletedTask;
				});
		}

		public void UpdateControls(PublicPropertyChange change)
		{
			if (change.Context.GetEditRow(nameof(TargetPercent)) is GuiWidget percentWidget)
			{
				percentWidget.Visible = Mode == ReductionMode.Polygon_Percent;
			}

			if (change.Context.GetEditRow(nameof(CountAfterPercentReduction)) is GuiWidget roTargetCountWidget)
			{
				roTargetCountWidget.Visible = Mode == ReductionMode.Polygon_Percent;
			}

			if (change.Context.GetEditRow(nameof(TargetCount)) is GuiWidget countWidget)
			{
				countWidget.Visible = Mode == ReductionMode.Polygon_Count;
			}
		}
	}
}