wpf-DrawingBrush注意点

1.DrawingBrush是笔刷 :)

2.用Drawing属性(Drawing类)来绘制区域

3.GeometryDrawing(负责填充,它是笔,结合Geometry类抽象轮廊)用于绘制一个特定笔刷和画笔的几何形状Geometry)
例如

                            <GeometryDrawing.Brush>
                                <LinearGradientBrush>
                                    <GradientStop Offset="0.0" Color="Blue" />
                                    <GradientStop Offset="1.0" Color="#CCCCFF" />
                                </LinearGradientBrush>
                            </GeometryDrawing.Brush>
                            <GeometryDrawing.Pen>
                                <Pen Thickness="10" Brush="Black" />
                            </GeometryDrawing.Pen>

4.Geometry 类(负责画画)只定义形状的几何图形，无法呈现自身(就是说它是抽象的,只是一个轮廊而已,需要Brush来填充,但其本身无法填充,需要容器)

                      <GeometryDrawing.Geometry>
                        <RectangleGeometry Rect="0,0,100,100" />
                      </GeometryDrawing.Geometry>

5.DrawingGroup
可以放置多个Drawing,同时DrawingGroup也是Drawing,所以也可以放DrawingGroup

6.GeometryGroup
可以放置多个Geometry