kriastans/InkCanvasForClass
kriastans/InkCanvasForClass
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支持绘制焦点在 y 轴上的双曲线

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clover_yan 2023-11-05 10:48:39 +08:00 committed by Kengwang
parent e3098d68fb
commit 40a4b9905a
1 changed files with 27 additions and 12 deletions
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39
Ink Canvas/MainWindow.xaml.cs
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@ -4748,16 +4748,31 @@ namespace Ink_Canvas
{ {
//第二笔：画双曲线 //第二笔：画双曲线
double k = drawMultiStepShapeSpecialParameter3; double k = drawMultiStepShapeSpecialParameter3;
a = Math.Sqrt(Math.Abs((endP.X - iniP.X) * (endP.X - iniP.X) - (endP.Y - iniP.Y) * (endP.Y - iniP.Y) / (k * k))); bool isHyperbolaFocalPointOnXAxis = Math.Abs((endP.Y - iniP.Y) / (endP.X - iniP.X)) < k;
b = a * k; if (isHyperbolaFocalPointOnXAxis) { // 焦点在 x 轴上
pointList = new List<Point>(); a = Math.Sqrt(Math.Abs((endP.X - iniP.X) * (endP.X - iniP.X) - (endP.Y - iniP.Y) * (endP.Y - iniP.Y) / (k * k)));
for (double i = a; i <= Math.Abs(endP.X - iniP.X); i += 0.5) b = a * k;
{ pointList = new List<Point>();
double rY = Math.Sqrt(Math.Abs(k * k * i * i - b * b)); for (double i = a; i <= Math.Abs(endP.X - iniP.X); i += 0.5)
pointList.Add(new Point(iniP.X + i, iniP.Y - rY)); {
pointList2.Add(new Point(iniP.X + i, iniP.Y + rY)); double rY = Math.Sqrt(Math.Abs(k * k * i * i - b * b));
pointList3.Add(new Point(iniP.X - i, iniP.Y - rY)); pointList.Add(new Point(iniP.X + i, iniP.Y - rY));
pointList4.Add(new Point(iniP.X - i, iniP.Y + rY)); pointList2.Add(new Point(iniP.X + i, iniP.Y + rY));
pointList3.Add(new Point(iniP.X - i, iniP.Y - rY));
pointList4.Add(new Point(iniP.X - i, iniP.Y + rY));
}
} else { // 焦点在 y 轴上
a = Math.Sqrt(Math.Abs((endP.Y - iniP.Y) * (endP.Y - iniP.Y) - (endP.X - iniP.X) * (endP.X - iniP.X) * (k * k)));
b = a / k;
pointList = new List<Point>();
for (double i = a; i <= Math.Abs(endP.Y - iniP.Y); i += 0.5)
{
double rX = Math.Sqrt(Math.Abs(i * i / k / k - b * b));
pointList.Add(new Point(iniP.X - rX, iniP.Y + i));
pointList2.Add(new Point(iniP.X + rX, iniP.Y + i));
pointList3.Add(new Point(iniP.X - rX, iniP.Y - i));
pointList4.Add(new Point(iniP.X + rX, iniP.Y - i));
}
} }
try try
{ {
@ -4777,12 +4792,12 @@ namespace Ink_Canvas
{ {
//画焦点 //画焦点
c = Math.Sqrt(a * a + b * b); c = Math.Sqrt(a * a + b * b);
stylusPoint = new StylusPoint(iniP.X + c, iniP.Y, (float)1.0); stylusPoint = isHyperbolaFocalPointOnXAxis ? new StylusPoint(iniP.X + c, iniP.Y, (float)1.0) : new StylusPoint(iniP.X, iniP.Y + c, (float)1.0);
point = new StylusPointCollection(); point = new StylusPointCollection();
point.Add(stylusPoint); point.Add(stylusPoint);
stroke = new Stroke(point) { DrawingAttributes = inkCanvas.DefaultDrawingAttributes.Clone() }; stroke = new Stroke(point) { DrawingAttributes = inkCanvas.DefaultDrawingAttributes.Clone() };
strokes.Add(stroke.Clone()); strokes.Add(stroke.Clone());
stylusPoint = new StylusPoint(iniP.X - c, iniP.Y, (float)1.0); stylusPoint = isHyperbolaFocalPointOnXAxis ? new StylusPoint(iniP.X - c, iniP.Y, (float)1.0) : new StylusPoint(iniP.X, iniP.Y - c, (float)1.0);
point = new StylusPointCollection(); point = new StylusPointCollection();
point.Add(stylusPoint); point.Add(stylusPoint);
stroke = new Stroke(point) { DrawingAttributes = inkCanvas.DefaultDrawingAttributes.Clone() }; stroke = new Stroke(point) { DrawingAttributes = inkCanvas.DefaultDrawingAttributes.Clone() };