[WPF]如何在画布上绘制网格？
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[WPF]How to draw a grid on canvas?
提问by ske
How to draw the following chart as a background on custom canvas inherited from Canvas - system ui element?
如何在继承自 Canvas-system ui 元素的自定义画布上绘制以下图表作为背景？
Thanks for any useful links.
感谢您提供任何有用的链接。
回答by King King
You can just set Canvas.Backgroundto some DrawingBrush. This brush can just need to render a Rectangle (by using some RectangleGeometry). Because of supporting for TileMode, we can repeat this rectangle along both horizontal and vertical axes and make the full grid for you:
您可以设置Canvas.Background为 some DrawingBrush。这个画笔只需要渲染一个矩形（通过使用 some RectangleGeometry）。由于支持TileMode，我们可以沿水平和垂直轴重复此矩形并为您制作完整的网格：
<Canvas>
<Canvas.Background>
<DrawingBrush TileMode="Tile" Viewport="-10,-10,40,40"
ViewportUnits="Absolute">
<DrawingBrush.Drawing>
<GeometryDrawing>
<GeometryDrawing.Geometry>
<RectangleGeometry Rect="0,0,50,50"/>
</GeometryDrawing.Geometry>
<GeometryDrawing.Pen>
<Pen Brush="Gray" Thickness="1"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
</DrawingBrush.Drawing>
</DrawingBrush>
</Canvas.Background>
</Canvas>
Note that you can draw something outside the Canvas but its Background is always inside its region. So you need to set the Size for your Canvas correctly.
请注意，您可以在画布之外绘制一些内容，但其背景始终位于其区域内。因此，您需要正确设置 Canvas 的 Size。
