mattercontrol/original/MatterControlLib/PartPreviewWindow/RoundedRectShape.cs

/*
Copyright (c) 2019, 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
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
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*/

using MatterHackers.Agg;
using MatterHackers.Agg.VertexSource;

namespace MatterHackers.MatterControl.PartPreviewWindow
{
	public class RoundedRectShape : FlattenCurves
	{ 
		public RoundedRectShape(RectangleDouble rect, double radius)
			: this (rect, radius, radius, radius, radius)
		{
		}

		public RoundedRectShape(RectangleDouble rect, double topLeftRadius = 0, double topRightRadius = 0, double bottomRightRadius = 0, double bottomLeftRadius = 0)
			: base(BuildShape(rect, topLeftRadius, topRightRadius, bottomRightRadius, bottomLeftRadius))
		{
		}

		private static IVertexSource BuildShape(RectangleDouble rect, double topLeftRadius, double topRightRadius, double bottomRightRadius, double bottomLeftRadius)
		{
			// See https://photos.app.goo.gl/YdTiehf6ih7fSoDA9 for point diagram

			var centerY = rect.YCenter;

			double radius;
			var tabShape2 = new VertexStorage();

			// A -> B
			radius = bottomLeftRadius;

			tabShape2.MoveTo(rect.Left + radius, rect.Bottom);
			if (radius > 0)
			{
				tabShape2.Curve3(rect.Left, rect.Bottom, rect.Left, rect.Bottom + radius);
			}

			// C -> D
			radius = topLeftRadius;
			tabShape2.LineTo(rect.Left, rect.Top - radius);
			if (radius > 0)
			{
				tabShape2.Curve3(rect.Left, rect.Top, rect.Left + radius, rect.Top);
			}

			// E -> F
			radius = topRightRadius;
			tabShape2.LineTo(rect.Right - radius, rect.Top);
			if (radius > 0)
			{
				tabShape2.Curve3(rect.Right, rect.Top, rect.Right, rect.Top - radius);
			}

			// G -> H
			radius = bottomRightRadius;
			tabShape2.LineTo(rect.Right, rect.Bottom + radius);
			if (radius > 0)
			{
				tabShape2.Curve3(rect.Right, rect.Bottom, rect.Right - radius, rect.Bottom);
			}

			// H -> A
			radius = bottomLeftRadius;
			tabShape2.LineTo(rect.Left - radius, rect.Bottom);

			return new FlattenCurves(tabShape2);
		}
	}
}