95 lines
3.7 KiB
C#
95 lines
3.7 KiB
C#
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using System;
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using System.Runtime.CompilerServices;
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using System.Windows;
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using System.Windows.Media;
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namespace WPFDark.Internals
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{
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internal static class StreamGeometryContextExtensions
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{
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// https://stackoverflow.com/questions/2979834/how-to-draw-a-full-ellipse-in-a-streamgeometry-in-wpf
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private static readonly double ControlPointRatio = (Math.Sqrt(2) - 1) * 4 / 3;
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internal static void DrawEllipse(this StreamGeometryContext ctx,
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Point center, double radiusX, double radiusY, bool isFilled, bool isStroked)
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{
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var x0 = center.X - radiusX;
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var x1 = center.X - radiusX * ControlPointRatio;
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var x2 = center.X;
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var x3 = center.X + radiusX * ControlPointRatio;
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var x4 = center.X + radiusX;
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var y0 = center.Y - radiusY;
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var y1 = center.Y - radiusY * ControlPointRatio;
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var y2 = center.Y;
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var y3 = center.Y + radiusY * ControlPointRatio;
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var y4 = center.Y + radiusY;
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ctx.BeginFigure(new Point(x2, y0), isFilled, true);
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ctx.BezierTo(new Point(x3, y0), new Point(x4, y1), new Point(x4, y2), isStroked, true);
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ctx.BezierTo(new Point(x4, y3), new Point(x3, y4), new Point(x2, y4), isStroked, true);
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ctx.BezierTo(new Point(x1, y4), new Point(x0, y3), new Point(x0, y2), isStroked, true);
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ctx.BezierTo(new Point(x0, y1), new Point(x1, y0), new Point(x2, y0), isStroked, true);
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}
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internal static void DrawArc(this StreamGeometryContext ctx,
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Point center, double radiusX, double radiusY,
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ArcPos pos)
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{
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var x0 = center.X - radiusX;
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var x1 = center.X - radiusX * ControlPointRatio;
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var x2 = center.X;
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var x3 = center.X + radiusX * ControlPointRatio;
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var x4 = center.X + radiusX;
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var y0 = center.Y - radiusY;
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var y1 = center.Y - radiusY * ControlPointRatio;
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var y2 = center.Y;
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var y3 = center.Y + radiusY * ControlPointRatio;
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var y4 = center.Y + radiusY;
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switch (pos)
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{
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case ArcPos.RightTop:
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ctx.BeginFigure(new Point(x2, y0), false, false);
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ctx.BezierTo(new Point(x3, y0), new Point(x4, y1), new Point(x4, y2), true, true);
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break;
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case ArcPos.LeftTop:
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ctx.BeginFigure(new Point(x2, y0), false, false);
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ctx.BezierTo(new Point(x1, y0), new Point(x0, y1), new Point(x0, y2), true, true);
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break;
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case ArcPos.RightBottom:
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ctx.BeginFigure(new Point(x2, y4), false, false);
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ctx.BezierTo(new Point(x3, y4), new Point(x4, y3), new Point(x4, y2), true, true);
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break;
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case ArcPos.LeftBottom:
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ctx.BeginFigure(new Point(x2, y4), false, false);
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ctx.BezierTo(new Point(x1, y4), new Point(x0, y3), new Point(x0, y2), true, true);
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break;
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default:
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throw new ArgumentOutOfRangeException(nameof(pos), pos, null);
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}
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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internal static void DrawTriangle(this StreamGeometryContext ctx,
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Point pos1, Point pos2, Point pos3, bool isStroked, bool isClosed)
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{
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ctx.BeginFigure(pos1, true, isClosed);
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ctx.LineTo(pos2, isStroked, false);
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ctx.LineTo(pos3, isStroked, false);
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}
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}
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internal enum ArcPos
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{
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RightTop,
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LeftTop,
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RightBottom,
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LeftBottom
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}
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}
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