[英]Draw a filled triangle in DrawingContext
这是这个问题的后续行动。
我试图使用DrawingContext
绘制一个填充三角形,它在DrawingVisual
渲染
目前,我已设法使用以下C#代码绘制三角形的轮廓:
private DrawingVisual CreateTriangle()
{
DrawingVisual triangle = new DrawingVisual();
using ( DrawingContext dc = triangle.RenderOpen() )
{
Pen drawingPen = new Pen(Brushes.Black,3);
dc.DrawLine(drawingPen, new Point(0, 50), new Point(50, 0));
dc.DrawLine(drawingPen, new Point(50, 0), new Point(50, 100));
dc.DrawLine(drawingPen, new Point(50, 100), new Point(0, 50));
}
return triangle;
}
我明白了:
如何绘制一个三角形,除了我绘制的边框还有红色填充?
使用dc.DrawGeometry
创建填充形状。
编辑:这个:
private DrawingVisual CreateTriangle()
{
var triangle = new DrawingVisual();
using (DrawingContext dc = triangle.RenderOpen())
{
var start = new Point(0, 50);
var segments = new []
{
new LineSegment(new Point(50,0), true),
new LineSegment(new Point(50, 100), true)
};
var figure = new PathFigure(start, segments, true);
var geo = new PathGeometry(new [] { figure });
dc.DrawGeometry(Brushes.Red, null, geo);
var drawingPen = new Pen(Brushes.Black, 3);
dc.DrawLine(drawingPen, new Point(0, 50), new Point(50, 0));
dc.DrawLine(drawingPen, new Point(50, 0), new Point(50, 100));
dc.DrawLine(drawingPen, new Point(50, 100), new Point(0, 50));
}
return triangle;
}
另外,如果您必须创建PathGeometry
并且使用DrawGeometry
您也可以使用它, DrawGeometry
您不需要原始的线条图。
dc.DrawGeometry(Brushes.Red, new Pen(Brushes.Black, 3), geo);
也许有点旧,但它可能会帮助别人。 它不使用PathGeometry,而是使用Stream几何。 “ 这种几何形状是PathGeometry的轻量级替代品 ”
Point p1 = new Point(0, 50);
Point p2 = new Point(50, 0);
Point p3 = new Point(50, 100);
StreamGeometry streamGeometry = new StreamGeometry();
using (StreamGeometryContext geometryContext = streamGeometry.Open())
{
geometryContext.BeginFigure(p1, true, true);
PointCollection points = new PointCollection{ p2, p3 };
geometryContext.PolyLineTo(points, true, true);
}
streamGeometry.Freeze();
context.DrawGeometry(Brushes.Red, new Pen(Brushes.Black,3), streamGeometry);
有关StreamGeometry的更多信息,请访问: https ://msdn.microsoft.com/en-us/library/system.windows.media.streamgeometry.aspx
问候。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.