WPF笔记(1.10 绘图)——Hello，WPF！

原文: WPF笔记(1.10 绘图)——Hello，WPF！

书中的代码语法过时了，改写为以下(测试通过)：

         < Button >
             < Button.LayoutTransform >
                 < ScaleTransform  ScaleX = "3 "  ScaleY = "3 "   />
             </ Button.LayoutTransform >
             < StackPanel Orientation = " Horizontal " >
                 < Canvas Width = " 20 "  Height = " 18 "  VerticalAlignment = " Center " >
                     < Ellipse Canvas.Left = " 1 "  Canvas.Top = " 1 "  Width = " 16 "  Height = " 16 "
                      Fill = " Yellow "  Stroke = " Black "   />
                     < Ellipse Canvas.Left = " 4.5 "  Canvas.Top = " 5 "  Width = " 2.5 "  Height = " 3 "
                      Fill = " Black "   />
                     < Ellipse Canvas.Left = " 11 "  Canvas.Top = " 5 "  Width = " 2.5 "  Height = " 3 "
                      Fill = " Black "   />
                     < Path Data = " M 5,10 A 3,3 0 0 0 13,10 "  Stroke = " Blue "   />
                 </ Canvas >
                 < TextBlock VerticalAlignment = " Center " > Click !</ TextBlock >
             </ StackPanel >
         </ Button >

ScaleTransform将button放大3倍。
Canvas上画图，画一个笑脸，3个椭圆，黄色是脸的轮廓，黄色是眼睛。蓝色钢笔画的是嘴巴——可以顺便了解这四个元素在Canvas上是怎么精确定位的。