public void CloseContour()
{
if (_isOpen)
{
_context.EndFigure(true);
_isOpen = false;
}
}
// 在此覆写方法中实现图形
protected override Geometry CreateDefiningGeometry()
{
StreamGeometry streamGeometry = new StreamGeometry();
using (StreamGeometryContext context = streamGeometry.Open())
{
double X1 = StartPoint.X;
double X2 = EndPoint.X;
double Y1 = StartPoint.Y;
double Y2 = EndPoint.Y;
// 往右走一部分的点
double X1Right = X1 + RightBias;
double X2Right = X2 + RightBias;
//(X1,Y1)--------(X1Right,Y1)
// |
// |
// |
//(X2,Y2)<|------(X2Right,Y2)
// 这里要计算的角就是下侧的边了
double theta = Math.Atan2(Y2 - Y2, X2Right - X2);
double sint = Math.Sin(theta);
double cost = Math.Cos(theta);
Point pt1 = new Point(X1, Y1);
Point pt2 = new Point(X1Right, Y1);
Point pt3 = new Point(X2Right, Y2);
Point pt4 = new Point(X2, Y2);
double HeadWidth = this.HeadWidth;
double HeadHeight = this.HeadHeight;
// 箭帽的两个点
Point pt5 = new Point(
X2 + (HeadWidth * cost - HeadHeight * sint),
Y2 + (HeadWidth * sint + HeadHeight * cost));
Point pt6 = new Point(
X2 + (HeadWidth * cost + HeadHeight * sint),
Y2 - (HeadHeight * cost - HeadWidth * sint));
context.BeginFigure(pt1, false);
context.LineTo(pt2);
context.LineTo(pt3);
context.LineTo(pt4);
context.LineTo(pt3); // 这里回到pt3和到pt2是避免从pt4闭合到pt1导致一大块Fill
context.LineTo(pt2);
context.EndFigure(false);
context.BeginFigure(pt5, true); // 带填充
context.LineTo(pt4);
context.LineTo(pt6);
context.EndFigure(true); // 箭帽闭合
Fill = Brushes.Black;
}
return(streamGeometry);
}
public override void MoveTo(float x0, float y0)
{
if (_isOpen)
{
_context.EndFigure(false); _isOpen = false;
}
// The second parameter does nothing on Skia: https://github.com/AvaloniaUI/Avalonia/issues/1419
_context.BeginFigure(new Point(x0, y0), _canvas.CurrentStyle == PaintStyle.Fill);
}
// 在此覆写方法中实现图形
protected override Geometry CreateDefiningGeometry()
{
StreamGeometry streamGeometry = new StreamGeometry();
using (StreamGeometryContext context = streamGeometry.Open())
{
// --
// | |
//------
//| |
//------
// 画锁圈
Point pt1 = new Point(Width / 4, Height / 2);
Point pt2 = new Point(Width / 4, 0);
Point pt3 = new Point(Width / 4 * 3, 0);
Point pt4 = new Point(Width / 4 * 3, Height / 2);
context.BeginFigure(pt1, false);
context.LineTo(pt2);
context.LineTo(pt3);
context.LineTo(pt4);
context.EndFigure(false);
// 画锁体
Point pt5 = new Point(0, Height / 2);
Point pt6 = new Point(Width, Height / 2);
Point pt7 = new Point(Width, Height);
Point pt8 = new Point(0, Height);
context.BeginFigure(pt5, false);
context.LineTo(pt6);
context.LineTo(pt7);
context.LineTo(pt8);
context.EndFigure(true);
// 画锁上X
//context.BeginFigure(pt5, false);
//context.LineTo(pt7);
//context.EndFigure(false);
//context.BeginFigure(pt6, false);
//context.LineTo(pt8);
//context.EndFigure(false);
}
return(streamGeometry);
}
// 在此覆写方法中实现图形
protected override Geometry CreateDefiningGeometry()
{
StreamGeometry streamGeometry = new StreamGeometry();
using (StreamGeometryContext context = streamGeometry.Open())
{
double X1 = StartPoint.X;
double X2 = EndPoint.X;
double Y1 = StartPoint.Y;
double Y2 = EndPoint.Y;
double theta = Math.Atan2(Y1 - Y2, X1 - X2);
double sint = Math.Sin(theta);
double cost = Math.Cos(theta);
Point pt1 = new Point(X1, Y1);
Point pt2 = new Point(X2, Y2);
double HeadWidth = this.HeadWidth;
double HeadHeight = this.HeadHeight;
Point pt3 = new Point(
X2 + (HeadWidth * cost - HeadHeight * sint),
Y2 + (HeadWidth * sint + HeadHeight * cost));
Point pt4 = new Point(
X2 + (HeadWidth * cost + HeadHeight * sint),
Y2 - (HeadHeight * cost - HeadWidth * sint));
// 绘制直线
context.BeginFigure(pt1, false);
context.LineTo(pt2);
context.EndFigure(false);
// 绘制封闭三角
context.BeginFigure(pt2, true);
context.LineTo(pt3);
context.LineTo(pt4);
context.EndFigure(true);
Fill = Brushes.Black;
}
return(streamGeometry);
}
private static void CreateGeometry(StreamGeometryContext context, Rect boundRect,
BorderGeometryKeypoints keypoints)
{
context.BeginFigure(keypoints.TopLeft, true);
// Top
context.LineTo(keypoints.TopRight);
// TopRight corner
var radiusX = boundRect.TopRight.X - keypoints.TopRight.X;
var radiusY = keypoints.RightTop.Y - boundRect.TopRight.Y;
if (radiusX != 0 || radiusY != 0)
{
context.ArcTo(keypoints.RightTop, new Size(radiusX, radiusY), 0, false, SweepDirection.Clockwise);
}
// Right
context.LineTo(keypoints.RightBottom);
// BottomRight corner
radiusX = boundRect.BottomRight.X - keypoints.BottomRight.X;
radiusY = boundRect.BottomRight.Y - keypoints.RightBottom.Y;
if (radiusX != 0 || radiusY != 0)
{
context.ArcTo(keypoints.BottomRight, new Size(radiusX, radiusY), 0, false, SweepDirection.Clockwise);
}
// Bottom
context.LineTo(keypoints.BottomLeft);
// BottomLeft corner
radiusX = keypoints.BottomLeft.X - boundRect.BottomLeft.X;
radiusY = boundRect.BottomLeft.Y - keypoints.LeftBottom.Y;
if (radiusX != 0 || radiusY != 0)
{
context.ArcTo(keypoints.LeftBottom, new Size(radiusX, radiusY), 0, false, SweepDirection.Clockwise);
}
// Left
context.LineTo(keypoints.LeftTop);
// TopLeft corner
radiusX = keypoints.TopLeft.X - boundRect.TopLeft.X;
radiusY = keypoints.LeftTop.Y - boundRect.TopLeft.Y;
if (radiusX != 0 || radiusY != 0)
{
context.ArcTo(keypoints.TopLeft, new Size(radiusX, radiusY), 0, false, SweepDirection.Clockwise);
}
context.EndFigure(true);
}
public void AddPathSegment(StreamGeometryContext canvasPathBuilder, ref bool closed)
{
if (!closed)
{
canvasPathBuilder.EndFigure(false);
}
else
{
closed = false;
}
canvasPathBuilder.BeginFigure(new Point(_points[0], _points[1]), true);
}
private void DrawPolygonsByStreamGeometry(
IList <IList <ScreenPoint> > polygons,
OxyColor fill,
OxyColor stroke,
double thickness,
EdgeRenderingMode edgeRenderingMode,
double[] dashArray,
LineJoin lineJoin)
{
Path path = null;
StreamGeometry streamGeometry = null;
StreamGeometryContext sgc = null;
var count = 0;
Func <ScreenPoint, Point> toPointFunc;
if (edgeRenderingMode == EdgeRenderingMode.PreferSpeed) // aliased
{
toPointFunc = ToPixelAlignedPoint;
}
else
{
toPointFunc = ToPoint;
}
bool isSolid = !fill.IsUndefined();
IBrush cachedBrush = null;
if (isSolid)
{
cachedBrush = GetCachedBrush(fill);
}
foreach (var polygon in polygons)
{
if (path == null)
{
path = CreateAndAdd <Path>();
SetStroke(path, stroke, thickness, edgeRenderingMode, lineJoin, dashArray, 0);
if (isSolid)
{
path.Fill = cachedBrush;
}
streamGeometry = new StreamGeometry();
sgc = streamGeometry.Open();
sgc.SetFillRule(FillRule.NonZero);
}
var first = true;
foreach (var p in polygon)
{
if (first)
{
sgc.BeginFigure(toPointFunc(p), isSolid);
first = false;
}
else
{
sgc.LineTo(toPointFunc(p));
}
}
sgc.EndFigure(true);
count++;
// Must limit the number of figures, otherwise drawing errors...
if (count > MaxFiguresPerGeometry)
{
sgc.Dispose();
path.Data = streamGeometry;
path = null;
count = 0;
}
}
if (path != null)
{
sgc.Dispose();
path.Data = streamGeometry;
}
}
private void DrawEllipsesByStreamGeometry(
IList <OxyRect> rects,
OxyColor fill,
OxyColor stroke,
double thickness,
EdgeRenderingMode edgeRenderingMode,
double[] dashArray,
LineJoin lineJoin)
{
const double ratio = 0.55228475; // (Math.Sqrt(2) - 1.0) * 4.0 / 3.0;
Path path = null;
StreamGeometry streamGeometry = null;
StreamGeometryContext sgc = null;
var count = 0;
bool isSolid = !fill.IsUndefined();
IBrush cachedBrush = null;
if (isSolid)
{
cachedBrush = GetCachedBrush(fill);
}
foreach (var rect in rects)
{
if (path == null)
{
path = CreateAndAdd <Path>();
SetStroke(path, stroke, thickness, edgeRenderingMode, lineJoin, dashArray, 0);
if (isSolid)
{
path.Fill = cachedBrush;
}
streamGeometry = new StreamGeometry();
sgc = streamGeometry.Open();
sgc.SetFillRule(FillRule.NonZero);
}
var a = rect.Width / 2.0;
var b = rect.Height / 2.0;
var x0 = rect.Center.X - a;
var x1 = rect.Center.X - a * ratio;
var x2 = rect.Center.X;
var x3 = rect.Center.X + a * ratio;
var x4 = rect.Center.X + a;
var y0 = rect.Center.Y - b;
var y1 = rect.Center.Y - b * ratio;
var y2 = rect.Center.Y;
var y3 = rect.Center.Y + b * ratio;
var y4 = rect.Center.Y + b;
sgc.BeginFigure(new Point(x2, y0), isSolid);
sgc.CubicBezierTo(new Point(x3, y0), new Point(x4, y1), new Point(x4, y2));
sgc.CubicBezierTo(new Point(x4, y3), new Point(x3, y4), new Point(x2, y4));
sgc.CubicBezierTo(new Point(x1, y4), new Point(x0, y3), new Point(x0, y2));
sgc.CubicBezierTo(new Point(x0, y1), new Point(x1, y0), new Point(x2, y0));
sgc.EndFigure(true);
count++;
// Must limit the number of figures, otherwise drawing errors...
if (count > MaxFiguresPerGeometry)
{
sgc.Dispose();
path.Data = streamGeometry;
path = null;
count = 0;
}
}
if (path != null)
{
sgc.Dispose();
path.Data = streamGeometry;
}
}
/// <summary>
/// Close the geometry to so no more path adding is allowed and return the instance so it can be rendered.
/// </summary>
public StreamGeometry GetClosedGeometry()
{
_geometryContext.EndFigure(true);
_geometryContext.Dispose();
return(_geometry);
}
private static void CreateGeometry(StreamGeometryContext context, Rect boundRect, BorderCoordinates borderCoordinates)
{
var topLeft = new Point(borderCoordinates.LeftTop, 0);
var topRight = new Point(boundRect.Width - borderCoordinates.RightTop, 0);
var rightTop = new Point(boundRect.Width, borderCoordinates.TopRight);
var rightBottom = new Point(boundRect.Width, boundRect.Height - borderCoordinates.BottomRight);
var bottomRight = new Point(boundRect.Width - borderCoordinates.RightBottom, boundRect.Height);
var bottomLeft = new Point(borderCoordinates.LeftBottom, boundRect.Height);
var leftBottom = new Point(0, boundRect.Height - borderCoordinates.BottomLeft);
var leftTop = new Point(0, borderCoordinates.TopLeft);
if (topLeft.X > topRight.X)
{
var scaledX = borderCoordinates.LeftTop / (borderCoordinates.LeftTop + borderCoordinates.RightTop) * boundRect.Width;
topLeft = new Point(scaledX, topLeft.Y);
topRight = new Point(scaledX, topRight.Y);
}
if (rightTop.Y > rightBottom.Y)
{
var scaledY = borderCoordinates.TopRight / (borderCoordinates.TopRight + borderCoordinates.BottomRight) * boundRect.Height;
rightTop = new Point(rightTop.X, scaledY);
rightBottom = new Point(rightBottom.X, scaledY);
}
if (bottomRight.X < bottomLeft.X)
{
var scaledX = borderCoordinates.LeftBottom / (borderCoordinates.LeftBottom + borderCoordinates.RightBottom) * boundRect.Width;
bottomRight = new Point(scaledX, bottomRight.Y);
bottomLeft = new Point(scaledX, bottomLeft.Y);
}
if (leftBottom.Y < leftTop.Y)
{
var scaledY = borderCoordinates.TopLeft / (borderCoordinates.TopLeft + borderCoordinates.BottomLeft) * boundRect.Height;
leftBottom = new Point(leftBottom.X, scaledY);
leftTop = new Point(leftTop.X, scaledY);
}
var offset = new Vector(boundRect.TopLeft.X, boundRect.TopLeft.Y);
topLeft += offset;
topRight += offset;
rightTop += offset;
rightBottom += offset;
bottomRight += offset;
bottomLeft += offset;
leftBottom += offset;
leftTop += offset;
context.BeginFigure(topLeft, true);
//Top
context.LineTo(topRight);
//TopRight corner
var radiusX = boundRect.TopRight.X - topRight.X;
var radiusY = rightTop.Y - boundRect.TopRight.Y;
if (radiusX != 0 || radiusY != 0)
{
context.ArcTo(rightTop, new Size(radiusY, radiusY), 0, false, SweepDirection.Clockwise);
}
//Right
context.LineTo(rightBottom);
//BottomRight corner
radiusX = boundRect.BottomRight.X - bottomRight.X;
radiusY = boundRect.BottomRight.Y - rightBottom.Y;
if (radiusX != 0 || radiusY != 0)
{
context.ArcTo(bottomRight, new Size(radiusX, radiusY), 0, false, SweepDirection.Clockwise);
}
//Bottom
context.LineTo(bottomLeft);
//BottomLeft corner
radiusX = bottomLeft.X - boundRect.BottomLeft.X;
radiusY = boundRect.BottomLeft.Y - leftBottom.Y;
if (radiusX != 0 || radiusY != 0)
{
context.ArcTo(leftBottom, new Size(radiusX, radiusY), 0, false, SweepDirection.Clockwise);
}
//Left
context.LineTo(leftTop);
//TopLeft corner
radiusX = topLeft.X - boundRect.TopLeft.X;
radiusY = leftTop.Y - boundRect.TopLeft.Y;
if (radiusX != 0 || radiusY != 0)
{
context.ArcTo(topLeft, new Size(radiusX, radiusY), 0, false, SweepDirection.Clockwise);
}
context.EndFigure(true);
}
public void AddPathSegment(StreamGeometryContext canvasPathBuilder, ref bool closed)
{
canvasPathBuilder.EndFigure(closed);
closed = true;
}