private void DrawEllipse(StreamGeometryContext context)
{
// Do not use because it is in DrawLine(...)
// context.BeginFigure(...);
double controlPointRatio = (Math.Sqrt(2) - 1) * 4 / 3;
var x0 = X2 - Radius;
var x1 = X2 - Radius * controlPointRatio;
var x2 = X2;
var x3 = X2 + Radius * controlPointRatio;
var x4 = X2 + Radius;
var y0 = Y2 - Radius;
var y1 = Y2 - Radius * controlPointRatio;
var y2 = Y2;
var y3 = Y2 + Radius * controlPointRatio;
var y4 = Y2 + Radius;
context.BeginFigure(new Point(x2, y0), false, true);
context.BezierTo(new Point(x3, y0), new Point(x4, y1), new Point(x4, y2), true, true);
context.BezierTo(new Point(x4, y3), new Point(x3, y4), new Point(x2, y4), true, true);
context.BezierTo(new Point(x1, y4), new Point(x0, y3), new Point(x0, y2), true, true);
context.BezierTo(new Point(x0, y1), new Point(x1, y0), new Point(x2, y0), true, true);
}
/// <summary>
/// Draw an arc
/// </summary>
/// <param name="context"></param>
private void InternalDrawNodeGeometry(StreamGeometryContext context)
{
if (R == 0 || Spokes == null || Spokes.Count < 2)
{
return;
}
context.BeginFigure(Center, false, false);
context.LineTo(spokep(0), true, false);
for (int i = 1; i < Spokes.Count; i++)
{
if (Math.Abs(Spokes[i] - Spokes[i - 1]) > 2 * Math.PI - .001)
{
// Display a circle
double ControlPointRatio = (Math.Sqrt(2) - 1) * 4 / 3;
var x0 = Center.X - R;
var x1 = Center.X - R * ControlPointRatio;
var x2 = Center.X;
var x3 = Center.X + R * ControlPointRatio;
var x4 = Center.X + R;
var y0 = Center.Y - R;
var y1 = Center.Y - R * ControlPointRatio;
var y2 = Center.Y;
var y3 = Center.Y + R * ControlPointRatio;
var y4 = Center.Y + R;
context.BeginFigure(new Point(x2, y0), true, true);
context.BezierTo(new Point(x3, y0), new Point(x4, y1), new Point(x4, y2), true, true);
context.BezierTo(new Point(x4, y3), new Point(x3, y4), new Point(x2, y4), true, true);
context.BezierTo(new Point(x1, y4), new Point(x0, y3), new Point(x0, y2), true, true);
context.BezierTo(new Point(x0, y1), new Point(x1, y0), new Point(x2, y0), true, true);
}
else
{
bool largearc = Math.Abs(Spokes[i] - Spokes[i - 1]) > Math.PI;
SweepDirection sd = SweepDirection.Counterclockwise;
if (Spokes[i] < Spokes[i - 1])
{
sd = SweepDirection.Clockwise;
}
context.ArcTo(spokep(i), new Size(R, R), 0, largearc, sd, true, false);
}
context.BeginFigure(Center, false, false);
context.LineTo(spokep(i), true, false);
}
}
private void button1_Click(object sender, System.Windows.RoutedEventArgs e)
{
Path path = new Path();
Canvas.SetLeft(path, 00); //设置和canvas1的相对位置
Canvas.SetTop(path, 00);
path.Stroke = Brushes.Red;
path.StrokeThickness = 2;
StreamGeometry sg = new StreamGeometry();
sg.FillRule = FillRule.EvenOdd; //取消交叉部分
//打开1个属于sg的StreamGeometryContext（sg.Open()）
using (StreamGeometryContext sgc = sg.Open()){
//设置图形的起点，true可利用图形剪裁，true构成封闭图形
sgc.BeginFigure(new Point(0, 200), true, true);
//绘制直线，终点，true描边，true平滑连接
sgc.LineTo(new Point(100, 150), true, true);
Point p = new Point(200, 150); //椭圆弧终点
Size s = new Size(100, 50); //圆弧宽、高
//绘制圆弧参数：终点，大小，沿X轴旋转角度，大于180度弧线，旋转方向，描边，平滑连接
sgc.ArcTo(p, s, 0, true, SweepDirection.Clockwise, true, true);
Point p1 = new Point(200, 150); //第1个控制点
Point p2 = new Point(300, 10); //第2个控制点
Point p3 = new Point(400, 230); //终点
sgc.BezierTo(p1, p2, p3, true, true); //绘制贝塞尔曲线
}
path.Data = sg;
this.canvas1.Children.Add(path); //canvas1是path的容器
this.image.Clip = sg; //剪裁图片
}
/// <summary>
/// 使用原始序列和指定的连接方式绘制几何图形
/// </summary>
/// <param name="points">样本序列</param>
/// <param name="isFilled">是否填充</param>
/// <param name="isClosed">是否闭合</param>
/// <returns>连接得到的几何图形</returns>
private Geometry DrawGeometry(List <Point> points, bool isFilled, bool isClosed, LineType type)
{
if (points != null)
{
StreamGeometry geometry = new StreamGeometry();
using (StreamGeometryContext ctx = geometry.Open()) //打开一个画板
{
ctx.BeginFigure(points[0], isFilled /* is filled */, isClosed /* is closed */); //设定画图的起始点
//画出一系列线段并且以折线的形式顺次连接
if (type == LineType.Line)
{
for (int i = 1; i < points.Count && points[i].X <= 480; i++)
{
ctx.LineTo(points[i], true, false);
}
}
//使用bezier曲线进行连接
else if (type == LineType.Bezier)
{
Bezier bezier = new Bezier(points, 0.7);
for (int i = 1; i < points.Count; i++)
{
ctx.BezierTo(bezier.controlPointCollection[2 * i - 2], bezier.controlPointCollection[2 * i - 1], points[i], true, false);
}
}
}
return(geometry);//返回得到的点列
}
else
{
throw new Exception("请先输入参数");
}
}
private void OnMeasurePropertyChanged(DependencyPropertyChangedEventArgs args)
{
if (_StreamGeometry == null)
{
_StreamGeometry = new StreamGeometry();
}
if (Points == null)
{
return;
}
using (StreamGeometryContext sgc = _StreamGeometry.Open()) {
// Get Bezier Spline Control Points.
PointCollection pnts = cardinalSpline(Points, .5, Closed);
sgc.BeginFigure(pnts[0], true, false);
for (int i = 1; i < pnts.Count; i += 3)
{
sgc.BezierTo(pnts[i], pnts[i + 1], pnts[i + 2], true, false);
}
}
InvalidateMeasure();
OnRenderPropertyChanged(args);
}
internal static void DrawArc(this StreamGeometryContext ctx,
Point center, double radiusX, double radiusY,
ArcPos pos)
{
var x0 = center.X - radiusX;
var x1 = center.X - radiusX * ControlPointRatio;
var x2 = center.X;
var x3 = center.X + radiusX * ControlPointRatio;
var x4 = center.X + radiusX;
var y0 = center.Y - radiusY;
var y1 = center.Y - radiusY * ControlPointRatio;
var y2 = center.Y;
var y3 = center.Y + radiusY * ControlPointRatio;
var y4 = center.Y + radiusY;
switch (pos)
{
case ArcPos.RightTop:
ctx.BeginFigure(new Point(x2, y0), false, false);
ctx.BezierTo(new Point(x3, y0), new Point(x4, y1), new Point(x4, y2), true, true);
break;
case ArcPos.LeftTop:
ctx.BeginFigure(new Point(x2, y0), false, false);
ctx.BezierTo(new Point(x1, y0), new Point(x0, y1), new Point(x0, y2), true, true);
break;
case ArcPos.RightBottom:
ctx.BeginFigure(new Point(x2, y4), false, false);
ctx.BezierTo(new Point(x3, y4), new Point(x4, y3), new Point(x4, y2), true, true);
break;
case ArcPos.LeftBottom:
ctx.BeginFigure(new Point(x2, y4), false, false);
ctx.BezierTo(new Point(x1, y4), new Point(x0, y3), new Point(x0, y2), true, true);
break;
default:
throw new ArgumentOutOfRangeException(nameof(pos), pos, null);
}
}
internal static void DrawEllipse(this StreamGeometryContext ctx,
Point center, double radiusX, double radiusY, bool isFilled, bool isStroked)
{
var x0 = center.X - radiusX;
var x1 = center.X - radiusX * ControlPointRatio;
var x2 = center.X;
var x3 = center.X + radiusX * ControlPointRatio;
var x4 = center.X + radiusX;
var y0 = center.Y - radiusY;
var y1 = center.Y - radiusY * ControlPointRatio;
var y2 = center.Y;
var y3 = center.Y + radiusY * ControlPointRatio;
var y4 = center.Y + radiusY;
ctx.BeginFigure(new Point(x2, y0), isFilled, true);
ctx.BezierTo(new Point(x3, y0), new Point(x4, y1), new Point(x4, y2), isStroked, true);
ctx.BezierTo(new Point(x4, y3), new Point(x3, y4), new Point(x2, y4), isStroked, true);
ctx.BezierTo(new Point(x1, y4), new Point(x0, y3), new Point(x0, y2), isStroked, true);
ctx.BezierTo(new Point(x0, y1), new Point(x1, y0), new Point(x2, y0), isStroked, true);
}
public override void Draw(DrawingContext ctx, Matrix matrix)
{
if (!this.IsValid)
{
return;
}
PathFigureEditor pathFigureEditor = new PathFigureEditor(this.PathGeometry.Figures[this.FigureIndex]);
StreamGeometry streamGeometry = new StreamGeometry();
StreamGeometryContext streamGeometryContext = streamGeometry.Open();
switch (this.PathPointKind)
{
case PathPointKind.Start:
throw new InvalidOperationException(ExceptionStringTable.PathSegmentAdornerIsolatedPointSegment);
case PathPointKind.Arc:
ArcSegment arcSegment = (ArcSegment)pathFigureEditor.PathFigure.Segments[this.SegmentIndex];
streamGeometryContext.BeginFigure(this.GetPoint(pathFigureEditor, -1), false, false);
streamGeometryContext.ArcTo(arcSegment.Point, arcSegment.Size, arcSegment.RotationAngle, arcSegment.IsLargeArc, arcSegment.SweepDirection, true, false);
break;
case PathPointKind.Line:
streamGeometryContext.BeginFigure(this.GetPoint(pathFigureEditor, -1), false, false);
streamGeometryContext.LineTo(this.GetPoint(pathFigureEditor, 0), true, false);
break;
case PathPointKind.Quadratic:
streamGeometryContext.BeginFigure(this.GetPoint(pathFigureEditor, -2), false, false);
streamGeometryContext.QuadraticBezierTo(this.GetPoint(pathFigureEditor, -1), this.GetPoint(pathFigureEditor, 0), true, false);
break;
case PathPointKind.Cubic:
streamGeometryContext.BeginFigure(this.GetPoint(pathFigureEditor, -3), false, false);
streamGeometryContext.BezierTo(this.GetPoint(pathFigureEditor, -2), this.GetPoint(pathFigureEditor, -1), this.GetPoint(pathFigureEditor, 0), true, false);
break;
case PathPointKind.BezierHandle:
throw new InvalidOperationException(ExceptionStringTable.PathSegmentAdornerLastPointIsBezier);
default:
throw new NotImplementedException(ExceptionStringTable.PathSegmentAdornerUnknownPathPoint);
}
streamGeometryContext.Close();
MatrixTransform matrixTransform = new MatrixTransform(matrix);
matrixTransform.Freeze();
streamGeometry.Transform = (Transform)matrixTransform;
streamGeometry.Freeze();
Pen pen = this.IsActive ? this.ThickPathSegmentPen : this.ThinPathSegmentPen;
ctx.DrawGeometry((Brush)null, pen, (System.Windows.Media.Geometry)streamGeometry);
ctx.DrawGeometry((Brush)null, PathSegmentAdorner.HitTestPen, (System.Windows.Media.Geometry)streamGeometry);
}
/// <summary>
/// Draws the And-Control
/// </summary>
/// <param name="context"></param>
protected void InternalDrawAndGeometry(StreamGeometryContext context)
{
Point pt1 = new Point(Width, 0);
Point pt2 = new Point(Width / 2, 0);
Point pt3 = new Point(-Width / 2, Height / 2);
Point pt4 = new Point(Width / 2, Height);
Point pt5 = new Point(Width, Height);
context.BeginFigure(pt1, true, true);
context.LineTo(pt2, true, false);
context.BezierTo(pt2, pt3, pt4, true, true);
context.LineTo(pt5, true, false);
}
public void DrawCurve(double x0, double y0, double x1, double y1, double x2, double y2,
double x3, double y3, Brush strokeBrush, double lineWidth)
{
StreamGeometry geometry = new StreamGeometry();
using (StreamGeometryContext ctx = geometry.Open())
{
ctx.BeginFigure(new Point(x0, y0), false, false);
ctx.BezierTo(new Point(x1, y1), new Point(x2, y2),
new Point(x3, y3), true, false);
}
dc.DrawGeometry(Brushes.Transparent, new Pen(strokeBrush, lineWidth), geometry);
}
public void DrawAndFillBeziers(Pen pen, Brush brush, TPointF[] points, TClippingStyle clippingStyle)
{
if (points == null || points.Length <= 1)
{
return;
}
if (!CheckPoints(points))
{
return;
}
StreamGeometry Line = new StreamGeometry();
using (StreamGeometryContext sc = Line.Open())
{
sc.BeginFigure(new Point(points[0].X, points[0].Y), brush != null, false);
for (int i = 1; i < points.Length - 2; i += 3)
{
sc.BezierTo(new Point(points[i].X, points[i].Y), new Point(points[i + 1].X, points[i + 1].Y), new Point(points[i + 2].X, points[i + 2].Y), true, true);
}
}
if (Line.CanFreeze)
{
Line.Freeze();
}
if (brush != null)
{
switch (clippingStyle)
{
case TClippingStyle.Exclude:
IntersectClip(Reverse(Line));
break;
case TClippingStyle.Include:
IntersectClip(Line);
break;
default:
//Will be handled below.
break;
}
}
if (clippingStyle == TClippingStyle.None)
{
FCanvas.DrawGeometry(brush, pen, Line);
}
}
public void DrawPath(IEnumerable <PathOp> ops, Pen pen, Brush brush)
{
StreamGeometry streamGeometry = new StreamGeometry();
using (StreamGeometryContext geometryContext = streamGeometry.Open())
{
foreach (var op in ops)
{
var mt = op as MoveTo;
if (mt != null)
{
geometryContext.BeginFigure(mt.Point.GetPoint(), true, false);
continue;
}
var lt = op as LineTo;
if (lt != null)
{
geometryContext.LineTo(lt.Point.GetPoint(), true, false);
continue;
}
var at = op as ArcTo;
if (at != null)
{
/*
* Point c1, c2;
* at.GetCircles(pp, out c1, out c2);
* var circleCenter = at.LargeArc ^ !at.SweepClockwise ? c2 : c1;
* var rotationAngle = (float)Math.Atan2(at.Point.Y - circleCenter.Y, at.Point.X - circleCenter.X);
* geometryContext.ArcTo(at.Point.GetPoint(), at.Radius.GetSize(), rotationAngle,
* at.LargeArc, at.SweepClockwise ? SweepDirection.Clockwise : SweepDirection.Counterclockwise,
* true, false
* );*/
throw new NotImplementedException();
}
var ct = op as CurveTo;
if (ct != null)
{
geometryContext.BezierTo(ct.Control1.GetPoint(), ct.Control2.GetPoint(), ct.Point.GetPoint(), true, false);
}
throw new NotSupportedException();
}
}
dc.DrawGeometry(brush?.GetBrush(), pen?.GetPen(), streamGeometry);
}
public static void DrawFigure(this StreamGeometryContext ctx, PathFigure figure)
{
ctx.BeginFigure(figure.StartPoint, figure.IsFilled, figure.IsClosed);
foreach (var segment in figure.Segments)
{
if (segment is LineSegment lineSegment)
{
ctx.LineTo(lineSegment.Point, lineSegment.IsStroked, lineSegment.IsSmoothJoin);
continue;
}
if (segment is BezierSegment bezierSegment)
{
ctx.BezierTo(bezierSegment.Point1, bezierSegment.Point2, bezierSegment.Point3, bezierSegment.IsStroked, bezierSegment.IsSmoothJoin);
continue;
}
if (segment is QuadraticBezierSegment quadraticSegment)
{
ctx.QuadraticBezierTo(quadraticSegment.Point1, quadraticSegment.Point2, quadraticSegment.IsStroked, quadraticSegment.IsSmoothJoin);
continue;
}
if (segment is PolyLineSegment polyLineSegment)
{
ctx.PolyLineTo(polyLineSegment.Points, polyLineSegment.IsStroked, polyLineSegment.IsSmoothJoin);
continue;
}
if (segment is PolyBezierSegment polyBezierSegment)
{
ctx.PolyBezierTo(polyBezierSegment.Points, polyBezierSegment.IsStroked, polyBezierSegment.IsSmoothJoin);
continue;
}
if (segment is PolyQuadraticBezierSegment polyQuadraticSegment)
{
ctx.PolyQuadraticBezierTo(polyQuadraticSegment.Points, polyQuadraticSegment.IsStroked, polyQuadraticSegment.IsSmoothJoin);
continue;
}
if (segment is ArcSegment arcSegment)
{
ctx.ArcTo(arcSegment.Point, arcSegment.Size, arcSegment.RotationAngle, arcSegment.IsLargeArc, arcSegment.SweepDirection, arcSegment.IsStroked, arcSegment.IsSmoothJoin);
continue;
}
}
}
public static void DrawFigure(StreamGeometryContext ctx, PathFigure figure)
{
ctx.BeginFigure(figure.StartPoint, figure.IsFilled, figure.IsClosed);
foreach (var segment in figure.Segments)
{
var lineSegment = segment as WpfLineSegment;
if (lineSegment != null)
{
ctx.LineTo(lineSegment.Point, lineSegment.IsStroked, lineSegment.IsSmoothJoin); continue;
}
var bezierSegment = segment as BezierSegment;
if (bezierSegment != null)
{
ctx.BezierTo(bezierSegment.Point1, bezierSegment.Point2, bezierSegment.Point3, bezierSegment.IsStroked, bezierSegment.IsSmoothJoin); continue;
}
var quadraticSegment = segment as QuadraticBezierSegment;
if (quadraticSegment != null)
{
ctx.QuadraticBezierTo(quadraticSegment.Point1, quadraticSegment.Point2, quadraticSegment.IsStroked, quadraticSegment.IsSmoothJoin); continue;
}
var polyLineSegment = segment as PolyLineSegment;
if (polyLineSegment != null)
{
ctx.PolyLineTo(polyLineSegment.Points, polyLineSegment.IsStroked, polyLineSegment.IsSmoothJoin); continue;
}
var polyBezierSegment = segment as PolyBezierSegment;
if (polyBezierSegment != null)
{
ctx.PolyBezierTo(polyBezierSegment.Points, polyBezierSegment.IsStroked, polyBezierSegment.IsSmoothJoin); continue;
}
var polyQuadraticSegment = segment as PolyQuadraticBezierSegment;
if (polyQuadraticSegment != null)
{
ctx.PolyQuadraticBezierTo(polyQuadraticSegment.Points, polyQuadraticSegment.IsStroked, polyQuadraticSegment.IsSmoothJoin); continue;
}
var arcSegment = segment as ArcSegment;
if (arcSegment != null)
{
ctx.ArcTo(arcSegment.Point, arcSegment.Size, arcSegment.RotationAngle, arcSegment.IsLargeArc, arcSegment.SweepDirection, arcSegment.IsStroked, arcSegment.IsSmoothJoin); continue;
}
}
}
/// <summary>
/// Generates a WPF geometry for a single graphic path geometry
/// </summary>
public static Geometry GenerateGeometry(GraphicPathGeometry graphicPathGeometry)
{
if (graphicPathGeometry == null)
{
return(null);
}
StreamGeometry geometry = new StreamGeometry();
geometry.FillRule = ConvertFillRule(graphicPathGeometry.FillRule);
StreamGeometryContext ctx = geometry.Open();
foreach (var segment in graphicPathGeometry.Segments)
{
switch (segment)
{
case GraphicMoveSegment graphicMove:
{
ctx.BeginFigure(graphicMove.StartPoint, true, graphicMove.IsClosed);
break;
}
case GraphicLineSegment graphicLineTo:
{
ctx.LineTo(graphicLineTo.To, true, true);
break;
}
case GraphicCubicBezierSegment graphicCubicBezier:
{
ctx.BezierTo(graphicCubicBezier.ControlPoint1, graphicCubicBezier.ControlPoint2, graphicCubicBezier.EndPoint, true, true);
break;
}
case GraphicQuadraticBezierSegment graphicQuadraticBezier:
{
ctx.QuadraticBezierTo(graphicQuadraticBezier.ControlPoint, graphicQuadraticBezier.EndPoint, true, true);
break;
}
}
}
ctx.Close();
geometry.Freeze();
return(geometry);
}
internal void FillContextForICurve(StreamGeometryContext context, ICurve iCurve)
{
if (iCurve == null)
{
return;
}
context.BeginFigure(CommonX.WpfPoint(iCurve.Start), false, false);
var c = iCurve as Curve;
if (c != null)
{
FillContexForCurve(context, c);
}
else
{
var cubicBezierSeg = iCurve as CubicBezierSegment;
if (cubicBezierSeg != null)
{
context.BezierTo(CommonX.WpfPoint(cubicBezierSeg.B(1)), CommonX.WpfPoint(cubicBezierSeg.B(2)),
CommonX.WpfPoint(cubicBezierSeg.B(3)), true, false);
}
else
{
var ls = iCurve as LineSegment;
if (ls != null)
{
context.LineTo(CommonX.WpfPoint(ls.End), true, false);
}
else
{
var rr = iCurve as RoundedRect;
if (rr != null)
{
FillContexForCurve(context, rr.Curve);
}
else
{
var poly = iCurve as Polyline;
FillContexForPolyline(context, poly);
}
}
}
}
}
private void InternalDrawArrowGeometry(StreamGeometryContext context)
{
_lstCtrPoints.Clear();
List <Point> lstPoints = new List <Point>();
List <Point> lstCtrPoints = new List <Point>();
foreach (Point pt in BezierPoints)
{
lstPoints.Add(new Point(pt.X, pt.Y));
}
if (_bDrawing == true && (BezierTmpPoint.X > 0 || BezierTmpPoint.Y > 0))
{
lstPoints.Add(new Point(BezierTmpPoint.X, BezierTmpPoint.Y));
for (int i = 0; i < lstPoints.Count; i++)
{
lstCtrPoints.AddRange(Control1(lstPoints, i));
if (i < lstPoints.Count - 1)
{
_lstCtrPoints.AddRange(Control1(lstPoints, i));
}
}
}
else if (_bDrawing == false)
{
for (int i = 0; i < lstPoints.Count; i++)
{
lstCtrPoints.AddRange(Control1(lstPoints, i));
_lstCtrPoints.AddRange(Control1(lstPoints, i));
}
}
if (lstPoints != null && lstPoints.Count > 1)
{
Point ptStart = lstPoints[0];
Point ptEnd = lstPoints[lstPoints.Count - 1];
//先绘制开始线帽
SetLineCap(lstPoints[lstPoints.Count - 2], ptEnd, ptStart, lstPoints[1]);
context.BeginFigure(ptStart, true, false);
//再绘制曲线
for (int i = 1; i < lstPoints.Count; i++)
{
context.BezierTo(lstCtrPoints[i * 2 - 1], lstCtrPoints[i * 2], lstPoints[i], true, true);
}
}
}
public void DrawBezier(Point[] pts, DrawingContext dc, Brush brush)
{
foreach (Point pt in pts)//绘制点
{
dc.DrawEllipse(brush, null, pt, 5, 5);
}
StreamGeometry sg = new StreamGeometry();
StreamGeometryContext sgc = sg.Open();
sgc.BeginFigure(pts[0], true, false);
sgc.BezierTo(pts[1], pts[2], pts[3], true, true);
sgc.BeginFigure(pts[0], true, false);
sgc.PolyLineTo(pts, true, true);
sgc.Close();
Pen pen = new Pen(brush, 1);
dc.DrawGeometry(null, pen, sg);
}
private static void DeserializeBezierTo(BinaryReader br, byte firstByte, StreamGeometryContext sc)
{
Point point1;
Point point2 = new Point();
Point point3 = new Point();
bool isStroked;
bool isSmoothJoin;
DeserializePointAndTwoBools(br, firstByte, out point1, out isStroked, out isSmoothJoin);
point2.X = XamlSerializationHelper.ReadDouble(br);
point2.Y = XamlSerializationHelper.ReadDouble(br);
point3.X = XamlSerializationHelper.ReadDouble(br);
point3.Y = XamlSerializationHelper.ReadDouble(br);
sc.BezierTo(point1, point2, point3, isStroked, isSmoothJoin);
}
static void FillContexForCurve(StreamGeometryContext context, Curve c)
{
foreach (ICurve seg in c.Segments)
{
var bezSeg = seg as CubicBezierSegment;
if (bezSeg != null)
{
context.BezierTo(CommonX.WpfPoint(bezSeg.B(1)),
CommonX.WpfPoint(bezSeg.B(2)), CommonX.WpfPoint(bezSeg.B(3)), true, false);
}
else
{
var ls = seg as LineSegment;
if (ls != null)
{
context.LineTo(CommonX.WpfPoint(ls.End), true, false);
}
else
{
var ellipse = seg as Ellipse;
if (ellipse != null)
{
// context.LineTo(Common.WpfPoint(ellipse.End),true,false);
double sweepAngle = EllipseSweepAngle(ellipse);
bool largeArc = Math.Abs(sweepAngle) >= Math.PI;
Rectangle box = ellipse.FullBox();
context.ArcTo(CommonX.WpfPoint(ellipse.End),
new Size(box.Width / 2, box.Height / 2),
sweepAngle,
largeArc,
sweepAngle < 0
? SweepDirection.Counterclockwise
: SweepDirection.Clockwise,
true, true);
}
else
{
throw new NotImplementedException();
}
}
}
}
}
/// <summary>
/// Returns the geometry scaled to the provided size.
/// </summary>
/// <param name="width">The width.</param>
/// <param name="height">The height.</param>
public Geometry Scaled(double width, double height)
{
StreamGeometry Result = new StreamGeometry();
GeometryScale ScaledWidth = (WidthScale != null) ? new GeometryScale(WidthScale, width) : null;
GeometryScale ScaledHeight = (HeightScale != null) ? new GeometryScale(HeightScale, height) : null;
using (StreamGeometryContext sgc = Result.Open())
{
sgc.BeginFigure(ScaledPoint(Figure.StartPoint, ScaledWidth, ScaledHeight), Figure.IsFilled, Figure.IsClosed);
foreach (PathSegment Segment in Figure.Segments)
{
LineSegment AsLineSegment;
PolyLineSegment AsPolyLineSegment;
BezierSegment AsBezierSegment;
PolyBezierSegment AsPolyBezierSegment;
if ((AsLineSegment = Segment as LineSegment) != null)
{
sgc.LineTo(ScaledPoint(AsLineSegment.Point, ScaledWidth, ScaledHeight), AsLineSegment.IsStroked, AsLineSegment.IsSmoothJoin);
}
else if ((AsPolyLineSegment = Segment as PolyLineSegment) != null)
{
sgc.PolyLineTo(ScaledPointList(AsPolyLineSegment.Points, ScaledWidth, ScaledHeight), AsPolyLineSegment.IsStroked, AsPolyLineSegment.IsSmoothJoin);
}
else if ((AsBezierSegment = Segment as BezierSegment) != null)
{
sgc.BezierTo(ScaledPoint(AsBezierSegment.Point1, ScaledWidth, ScaledHeight), ScaledPoint(AsBezierSegment.Point2, ScaledWidth, ScaledHeight), ScaledPoint(AsBezierSegment.Point3, ScaledWidth, ScaledHeight), AsBezierSegment.IsStroked, AsBezierSegment.IsSmoothJoin);
}
else if ((AsPolyBezierSegment = Segment as PolyBezierSegment) != null)
{
sgc.PolyBezierTo(ScaledPointList(AsPolyBezierSegment.Points, ScaledWidth, ScaledHeight), AsPolyBezierSegment.IsStroked, AsPolyBezierSegment.IsSmoothJoin);
}
}
}
return(Result);
}
private void clearAndDrawCurves(IEnumerable <CubicBezier> curves, bool colorize)
{
using (DrawingContext dctx = _drawing.Open())
{
clearDrawing(dctx);
int i = 0;
foreach (CubicBezier curve in curves)
{
// each curve segment is a seperate StreamGeometry since they use different pens
Pen pen = colorize ? _partPens[i++ % _partPens.Length] : _partPens[0];
StreamGeometry geo = new StreamGeometry();
using (StreamGeometryContext gctx = geo.Open())
{
gctx.BeginFigure(toWpfPoint(curve.p0), false, false);
gctx.BezierTo(toWpfPoint(curve.p1), toWpfPoint(curve.p2), toWpfPoint(curve.p3), true, false);
}
geo.Freeze();
dctx.DrawGeometry(null, pen, geo);
}
}
}
private void button1_Click(object sender, System.Windows.RoutedEventArgs e)
{
StreamGeometry sg = new StreamGeometry();
sg.FillRule = FillRule.EvenOdd;
using (StreamGeometryContext sgc = sg.Open()){
sgc.BeginFigure(new Point(0, 200), true, true);
sgc.LineTo(new Point(100, 150), true, true);
Point p = new Point(200, 150); //椭圆弧终点
Size s = new Size(100, 50); //圆弧宽、高
sgc.ArcTo(p, s, 0, true, SweepDirection.Clockwise, true, true);
Point p1 = new Point(200, 150); //第1个控制点
Point p2 = new Point(300, 10); //第2个控制点
Point p3 = new Point(400, 230); //终点
sgc.BezierTo(p1, p2, p3, true, true); //绘制贝塞尔曲线
}
GeometryDrawing gd = new GeometryDrawing(); //定义绘制几何形状对象
gd.Geometry = sg; //绘制的几何图形
LinearGradientBrush lgb = new LinearGradientBrush(); //定义线性渐变
//默认的线性渐变是沿对角线方向进行的，
//StartPoint是被填充区域的左上角 (0,0)，EndPoint是被填充区域的右下角 (1,1)，
//EndPoint(1,0)水平方向，EndPoint(0,1)垂直方向。
lgb.StartPoint = new Point(0, 0);
lgb.EndPoint = new Point(1, 0);
lgb.GradientStops.Add(new GradientStop(Colors.Red, 0.1)); //插入渐变停止点
lgb.GradientStops.Add(new GradientStop(Colors.LightSkyBlue, 0.25));
lgb.GradientStops.Add(new GradientStop(Colors.Blue, 0.5));
lgb.GradientStops.Add(new GradientStop(Colors.LightGreen, 0.75));
gd.Brush = lgb; //绘制图形填充色
gd.Pen = new Pen(Brushes.Red, 2); //描边色
DrawingImage di = new DrawingImage(gd); //绘制图像用于显示
Image myimage = new Image(); //定义图像对象
myimage.Source = di; //赋予图像对象
Canvas.SetLeft(myimage, 60); //位置坐标
Canvas.SetTop(myimage, 30);
this.canvas1.Children.Add(myimage); //图像装入容器显示
}
/// <span class="code-SummaryComment"><summary></span>
/// Draws an Arrow
/// <span class="code-SummaryComment"></summary></span>
private void InternalDrawArrowGeometry(StreamGeometryContext context)
{
vm = DataContext as ConnectionViewModel;
if (vm == null)
{
return;
}
if (vm.Type == EdgeLineType.Line)
{
context.BeginFigure(FromPoint, false, false);
context.LineTo(ToPoint, true, false);
}
else if (vm.Type == EdgeLineType.Bezier)
{
var bezierPoints = vm.GetBezierPoints();
context.BeginFigure(bezierPoints[0], false, false);
context.BezierTo(bezierPoints[1], bezierPoints[2], bezierPoints[3], true, true);
}
}
public StreamGeometryBezierToExample()
{
// Create a StreamGeometry to use to specify myPath.
StreamGeometry geometry = new StreamGeometry();
geometry.FillRule = FillRule.EvenOdd;
// Open a StreamGeometryContext that can be used to describe this StreamGeometry
// object's contents.
using (StreamGeometryContext ctx = geometry.Open())
{
// Set the begin point of the shape.
ctx.BeginFigure(new Point(10, 100), true /* is filled */, false /* is closed */);
// Create a Bezier curve using the 3 specifed points where the first two points
// are control points and the last point is the destination point for the curve.
ctx.BezierTo(new Point(100, 0), new Point(200, 200), new Point(300, 100),
true /* is stroked */, false /* is smooth join */);
}
// Create a path to draw a geometry with.
Path myPath = new Path();
myPath.Stroke = Brushes.Black;
myPath.StrokeThickness = 1;
// Freeze the geometry (make it unmodifiable)
// for additional performance benefits.
geometry.Freeze();
// specify the shape (Bezier Curve) of the path using the StreamGeometry.
myPath.Data = geometry;
// Add path shape to the UI.
StackPanel mainPanel = new StackPanel();
mainPanel.Children.Add(myPath);
this.Content = mainPanel;
}
/// <summary>
/// 绘图函数绘出图像如果过于折现化说明样本点密度过低，请改用bezier函数连接以改善图形
/// </summary>
/// <param name="values">样本序列</param>
/// <param name="isFilled"></param>
/// <param name="isClosed">是否闭合</param>
/// <returns></returns>
private Geometry DrawGeometry(List <Point> values, bool isFilled, bool isClosed, Type type)
{
try
{
StreamGeometry geometry = new StreamGeometry();
using (StreamGeometryContext ctx = geometry.Open())
{
ctx.BeginFigure(values[0], isFilled /* is filled */, isClosed /* is closed */);
//画出一系列线段并且连接成曲线
if (type == Type.Line)
{
for (int i = 1; i < values.Count && values[i].X <= 480; i++)
{
ctx.LineTo(values[i], true, false);
}
}
//使用bezier曲线进行连接
else if (type == Type.Bezier)
{
Bezier bezier = new Bezier(values, 0.7);
for (int i = 1; i < values.Count; i++)
{
ctx.BezierTo(bezier.controlPointCollection[2 * i - 2], bezier.controlPointCollection[2 * i - 1], values[i], true, false);
}
}
}
return(geometry);
}
catch (Exception)
{
MessageBox.Show("请先输入频率");
return(null);
}
}
public static void Write(this StreamGeometryContext ctx, PathSegment pathSegment)
{
switch (pathSegment)
{
case ArcSegment arc:
ctx.ArcTo(arc.Point, arc.Size, arc.RotationAngle, arc.IsLargeArc, arc.SweepDirection, false, false);
break;
case BezierSegment bezier:
ctx.BezierTo(bezier.Point1, bezier.Point2, bezier.Point3, false, false);
break;
case PolyBezierSegment polyBezier:
ctx.PolyBezierTo(polyBezier.Points, false, false);
break;
case PolyLineSegment polyLine:
ctx.PolyLineTo(polyLine.Points, false, false);
break;
case QuadraticBezierSegment quadraticBezier:
ctx.QuadraticBezierTo(quadraticBezier.Point1, quadraticBezier.Point2, false, false);
break;
case PolyQuadraticBezierSegment polyQuadraticBezier:
ctx.PolyQuadraticBezierTo(polyQuadraticBezier.Points, false, false);
break;
case LineSegment line:
ctx.LineTo(line.Point, false, false);
break;
default:
break;
}
}
/// <summary>
/// Parse a PathFigureCollection string
/// </summary>
internal void ParseToGeometryContext(
StreamGeometryContext context,
string pathString,
int startIndex)
{
// [BreakingChange] Dev10 Bug #453199
// We really should throw an ArgumentNullException here for context and pathString.
// From original code
// This is only used in call to Double.Parse
_formatProvider = System.Globalization.CultureInfo.InvariantCulture;
_context = context;
_pathString = pathString;
_pathLength = pathString.Length;
_curIndex = startIndex;
_secondLastPoint = new Point(0, 0);
_lastPoint = new Point(0, 0);
_lastStart = new Point(0, 0);
_figureStarted = false;
bool first = true;
char last_cmd = ' ';
while (ReadToken()) // Empty path is allowed in XAML
{
char cmd = _token;
if (first)
{
if ((cmd != 'M') && (cmd != 'm')) // Path starts with M|m
{
ThrowBadToken();
}
first = false;
}
switch (cmd)
{
case 'm':
case 'M':
// XAML allows multiple points after M/m
_lastPoint = ReadPoint(cmd, !AllowComma);
context.BeginFigure(_lastPoint, IsFilled, !IsClosed);
_figureStarted = true;
_lastStart = _lastPoint;
last_cmd = 'M';
while (IsNumber(AllowComma))
{
_lastPoint = ReadPoint(cmd, !AllowComma);
context.LineTo(_lastPoint, IsStroked, !IsSmoothJoin);
last_cmd = 'L';
}
break;
case 'l':
case 'L':
case 'h':
case 'H':
case 'v':
case 'V':
EnsureFigure();
do
{
switch (cmd)
{
case 'l': _lastPoint = ReadPoint(cmd, !AllowComma); break;
case 'L': _lastPoint = ReadPoint(cmd, !AllowComma); break;
case 'h': _lastPoint.X += ReadNumber(!AllowComma); break;
case 'H': _lastPoint.X = ReadNumber(!AllowComma); break;
case 'v': _lastPoint.Y += ReadNumber(!AllowComma); break;
case 'V': _lastPoint.Y = ReadNumber(!AllowComma); break;
}
context.LineTo(_lastPoint, IsStroked, !IsSmoothJoin);
}while (IsNumber(AllowComma));
last_cmd = 'L';
break;
case 'c':
case 'C': // cubic Bezier
case 's':
case 'S': // smooth cublic Bezier
EnsureFigure();
do
{
Point p;
if ((cmd == 's') || (cmd == 'S'))
{
if (last_cmd == 'C')
{
p = Reflect();
}
else
{
p = _lastPoint;
}
_secondLastPoint = ReadPoint(cmd, !AllowComma);
}
else
{
p = ReadPoint(cmd, !AllowComma);
_secondLastPoint = ReadPoint(cmd, AllowComma);
}
_lastPoint = ReadPoint(cmd, AllowComma);
context.BezierTo(p, _secondLastPoint, _lastPoint, IsStroked, !IsSmoothJoin);
last_cmd = 'C';
}while (IsNumber(AllowComma));
break;
case 'q':
case 'Q': // quadratic Bezier
case 't':
case 'T': // smooth quadratic Bezier
EnsureFigure();
do
{
if ((cmd == 't') || (cmd == 'T'))
{
if (last_cmd == 'Q')
{
_secondLastPoint = Reflect();
}
else
{
_secondLastPoint = _lastPoint;
}
_lastPoint = ReadPoint(cmd, !AllowComma);
}
else
{
_secondLastPoint = ReadPoint(cmd, !AllowComma);
_lastPoint = ReadPoint(cmd, AllowComma);
}
context.QuadraticBezierTo(_secondLastPoint, _lastPoint, IsStroked, !IsSmoothJoin);
last_cmd = 'Q';
}while (IsNumber(AllowComma));
break;
case 'a':
case 'A':
EnsureFigure();
do
{
// A 3,4 5, 0, 0, 6,7
double w = ReadNumber(!AllowComma);
double h = ReadNumber(AllowComma);
double rotation = ReadNumber(AllowComma);
bool large = ReadBool();
bool sweep = ReadBool();
_lastPoint = ReadPoint(cmd, AllowComma);
context.ArcTo(
_lastPoint,
new Size(w, h),
rotation,
large,
#if PBTCOMPILER
sweep,
#else
sweep ? SweepDirection.Clockwise : SweepDirection.Counterclockwise,
#endif
IsStroked,
!IsSmoothJoin
);
}while (IsNumber(AllowComma));
last_cmd = 'A';
break;
case 'z':
case 'Z':
EnsureFigure();
context.SetClosedState(IsClosed);
_figureStarted = false;
last_cmd = 'Z';
_lastPoint = _lastStart; // Set reference point to be first point of current figure
break;
default:
ThrowBadToken();
break;
}
}
}
static private void CreateEdgePathFromCurve(StreamGeometryContext context, ICurve iCurve)
{
context.BeginFigure(iCurve.Start.ToWpf(), false, false);
var c = iCurve as Curve;
if (c != null)
{
FillContexForCurve(context, c);
return;
}
var cubicBezierSeg = iCurve as CubicBezierSegment;
if (cubicBezierSeg != null)
{
context.BezierTo(cubicBezierSeg.B(1).ToWpf(), cubicBezierSeg.B(2).ToWpf(), cubicBezierSeg.B(3).ToWpf(), true, false);
return;
}
var ls = iCurve as GeometryLineSegment;
if (ls != null)
{
context.LineTo(ls.End.ToWpf(), true, false);
return;
}
var rr = iCurve as RoundedRect;
if (rr != null)
{
FillContexForCurve(context, rr.Curve);
return;
}
var poly = iCurve as GeometryPolyline;
if (poly != null)
{
FillContexForPolyline(context, poly);
return;
}
var ellipse = iCurve as GeometryEllipse;
if (ellipse != null)
{
// context.LineTo(Common.WpfPoint(ellipse.End),true,false);
double sweepAngle = EllipseSweepAngle(ellipse);
bool largeArc = Math.Abs(sweepAngle) >= Math.PI;
GeometryRectangle box = ellipse.FullBox();
context.ArcTo(ellipse.End.ToWpf(),
new Size(box.Width / 2, box.Height / 2),
sweepAngle,
largeArc,
sweepAngle < 0
? SweepDirection.Counterclockwise
: SweepDirection.Clockwise,
true, true);
return;
}
else
{
throw new NotImplementedException($"{iCurve.GetType()}");
}
}
private static void DeserializeBezierTo(BinaryReader br, byte firstByte, StreamGeometryContext sc)
{
Point point1;
Point point2 = new Point();
Point point3 = new Point();
bool isStroked;
bool isSmoothJoin;
DeserializePointAndTwoBools(br, firstByte, out point1, out isStroked, out isSmoothJoin);
point2.X = XamlSerializationHelper.ReadDouble(br);
point2.Y = XamlSerializationHelper.ReadDouble(br);
point3.X = XamlSerializationHelper.ReadDouble(br);
point3.Y = XamlSerializationHelper.ReadDouble(br);
sc.BezierTo(point1, point2, point3, isStroked, isSmoothJoin);
}
void ellipse(double xm, double ym, double r, StreamGeometryContext context)
{
double ctrl_ell_x1 = Radius * kappa;
double ctrl_ell_y1 = Radius;
double ctrl_ell_x2 = Radius;
double ctrl_ell_y2 = Radius * kappa;
double ell_x = Radius * Math.Sin(2 * Math.PI * 0.25);
double ell_y = Radius * Math.Cos(2 * Math.PI * 0.25);
var ctrlPoint1 = new Point(xm + ctrl_ell_x1, ym - ctrl_ell_y1);
var ctrlPoint2 = new Point(xm + ctrl_ell_x2, ym - ctrl_ell_y2);
var point = new Point(xm + ell_x, ym - ell_y);
context.BezierTo(ctrlPoint1, ctrlPoint2, point, true, true);
//--------------------------------------------------------------------------
ctrl_ell_x2 = Radius * kappa;
ctrl_ell_y2 = -Radius;
ctrl_ell_x1 = Radius;
ctrl_ell_y1 = -Radius * kappa;
ell_x = Radius * Math.Sin(2 * Math.PI * 0.50);
ell_y = Radius * Math.Cos(2 * Math.PI * 0.50);
ctrlPoint1 = new Point(xm + ctrl_ell_x1, ym - ctrl_ell_y1);
ctrlPoint2 = new Point(xm + ctrl_ell_x2, ym - ctrl_ell_y2);
point = new Point(xm + ell_x, ym - ell_y);
context.BezierTo(ctrlPoint1, ctrlPoint2, point, true, true);
//--------------------------------------------------------------------------
ctrl_ell_x1 = -Radius * kappa;
ctrl_ell_y1 = -Radius;
ctrl_ell_x2 = -Radius;
ctrl_ell_y2 = -Radius * kappa;
ell_x = Radius * Math.Sin(2 * Math.PI * 0.75);
ell_y = Radius * Math.Cos(2 * Math.PI * 0.75);
ctrlPoint1 = new Point(xm + ctrl_ell_x1, ym - ctrl_ell_y1);
ctrlPoint2 = new Point(xm + ctrl_ell_x2, ym - ctrl_ell_y2);
point = new Point(xm + ell_x, ym - ell_y);
context.BezierTo(ctrlPoint1, ctrlPoint2, point, true, true);
//--------------------------------------------------------------------------
ctrl_ell_x2 = -Radius * kappa;
ctrl_ell_y2 = Radius;
ctrl_ell_x1 = -Radius;
ctrl_ell_y1 = Radius * kappa;
ell_x = Radius * Math.Sin(2 * Math.PI * 1);
ell_y = Radius * Math.Cos(2 * Math.PI * 1);
ctrlPoint1 = new Point(xm + ctrl_ell_x1, ym - ctrl_ell_y1);
ctrlPoint2 = new Point(xm + ctrl_ell_x2, ym - ctrl_ell_y2);
point = new Point(xm + ell_x, ym - ell_y);
context.BezierTo(ctrlPoint1, ctrlPoint2, point, true, true);
//--------------------------------------------------------------------------
}
