[英]Draw a filled triangle in DrawingContext
這是這個問題的后續行動。
我試圖使用DrawingContext
繪制一個填充三角形,它在DrawingVisual
渲染
目前,我已設法使用以下C#代碼繪制三角形的輪廓:
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:
如何繪制一個三角形,除了我繪制的邊框還有紅色填充?
使用dc.DrawGeometry
創建填充形狀。
編輯:這個:
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,如果您必須創建PathGeometry
並且使用DrawGeometry
您也可以使用它, DrawGeometry
您不需要原始的線條圖。
dc.DrawGeometry(Brushes.Red, new Pen(Brushes.Black, 3), geo);
也許有點舊,但它可能會幫助別人。 它不使用PathGeometry,而是使用Stream幾何。 “ 這種幾何形狀是PathGeometry的輕量級替代品 ”
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);
有關StreamGeometry的更多信息,請訪問: https ://msdn.microsoft.com/en-us/library/system.windows.media.streamgeometry.aspx
問候。
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