StreamGeometryContext 类解析

使用绘图命令描述几何图形。 此类与 StreamGeometry 类结合使用，以创建不支持数据绑定、动画或修改的轻量几何图形。

using System;using System.Windows;using System.Windows.Controls;using System.Windows.Media;using System.Windows.Shapes;namespace SDKSample{    // Use StreamGeometry with StreamGeometryContext to define a triangle shape.    public partial class StreamGeometryTriangleExample : Page    {        public StreamGeometryTriangleExample()        {            // Create a path to draw a geometry with.            Path myPath = new Path();            myPath.Stroke = Brushes.Black;            myPath.StrokeThickness = 1;            // 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())            {                // Begin the triangle at the point specified. Notice that the shape is set to                 // be closed so only two lines need to be specified below to make the triangle.                ctx.BeginFigure(new Point(10, 100), true /* is filled */, true /* is closed */);                // Draw a line to the next specified point.                ctx.LineTo(new Point(100, 100), true /* is stroked */, false /* is smooth join */);                // Draw another line to the next specified point.                ctx.LineTo(new Point(100, 50), true /* is stroked */, false /* is smooth join */);            }            // Freeze the geometry (make it unmodifiable)            // for additional performance benefits.            geometry.Freeze();            // Specify the shape (triangle) 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;        }    }}