最近在研究WPF的PATH ，想做一个透视效果的贴图，但是效果如下，没有达到视线由近及远的效果。

想要达到效果如下

代码如下：

  <Grid>
        <Canvas Margin="5">
        <Path Canvas.Left="10" Canvas.Top="10"  Stroke="Green">
                <Path.Data>
                    <PathGeometry>
                        <PathFigure StartPoint="0,300" IsClosed="True">
                            <LineSegment Point="500,300"></LineSegment>
                            <LineSegment Point="240,190"></LineSegment>
                            <LineSegment Point="120,190"></LineSegment>
                        </PathFigure>
                    </PathGeometry>
                </Path.Data>
                <Path.Fill>
                    <ImageBrush ImageSource="floor.jpg" Stretch="UniformToFill"></ImageBrush>
                </Path.Fill>
        </Path>
        </Canvas>
       
    </Grid>

那我高手可以指点一下啊。