WPF–System.Windows.Controls.Canvas

更改坐标原点

通过 ScaleTransform 加上 TranslateTransform 来完成，下面的例子中是一个 1000 乘 1000 大小的 Canvas, 希望将其坐标原点移到中心，就是 500，500 处

<Canvas Height="1000" Width="1000">
    <Canvas.Resources>
        <Style TargetType="{x:Type TextBlock}">
            <Setter Property="RenderTransform">
                <Setter.Value>
                    <ScaleTransform ScaleY="-1"/>
                </Setter.Value>
            </Setter>
        </Style>
    </Canvas.Resources>
    <Canvas.RenderTransform>
        <TransformGroup>
            <ScaleTransform ScaleY="-1"/>
            <TranslateTransform X="500" Y="500"/>
        </TransformGroup>
    </Canvas.RenderTransform>
    <Line X1="0" Y1="0" X2="100" Y2="100" Stroke="Black" StrokeThickness="1"/>
    <Line X1="90" Y1="100" X2="110" Y2="100" Stroke="Red" StrokeThickness="1"/>
    <Line X1="100" Y1="90" X2="100" Y2="110" Stroke="Red" StrokeThickness="1"/>
    <TextBlock Text="hello!" Canvas.Left="-100" Canvas.Top="0"/>
</Canvas>

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