如何创建棋盘格局？

Question

可能是一个微不足道的问题:我需要填充一个带有棋盘图案的矩形,其中每个单元的大小为1x1像素.如何在XAML中为此模式创建矢量几何？我没有使用Blend我正在手工制作矢量图形.

谢谢康斯坦丁

Answer 1

您将从以下XAML获得以下内容:

..

这是XAML的长版本,拼写出正在创建的几何体.RectangleGeometry元素的Rect属性采用left,top,width,height序列.

<Window x:Class="WpfApplication2.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="250" Width="250">
    <Canvas>
        <Rectangle Width="100" Height="100" Canvas.Left="10" Canvas.Top="10">
            <Rectangle.Fill>
                <DrawingBrush Stretch="None" TileMode="Tile" Viewport="0,0,2,2" ViewportUnits="Absolute">

                    <!-- a drawing of 4 checkerboard tiles -->
                    <DrawingBrush.Drawing>
                        <DrawingGroup>

                            <!-- checkerboard background -->
                            <GeometryDrawing Brush="White">
                                <GeometryDrawing.Geometry>
                                    <RectangleGeometry Rect="0,0,2,2" />
                                </GeometryDrawing.Geometry>
                            </GeometryDrawing>

                            <!-- two checkerboard foreground tiles -->
                            <GeometryDrawing Brush="Black">
                                <GeometryDrawing.Geometry>
                                    <GeometryGroup>
                                        <RectangleGeometry Rect="0,0,1,1" />
                                        <RectangleGeometry Rect="1,1,1,1" />
                                    </GeometryGroup>
                                </GeometryDrawing.Geometry>
                            </GeometryDrawing>

                        </DrawingGroup>
                    </DrawingBrush.Drawing>
                </DrawingBrush>
            </Rectangle.Fill>
        </Rectangle>
    </Canvas>
</Window>

以下较短版本呈现完全相同的图像,但使用几何的简写表示法.棋盘图块呈现为路径.

<Window x:Class="WpfApplication2.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="250" Width="250">
    <Canvas>
        <Rectangle Width="100" Height="100" Canvas.Left="10" Canvas.Top="10">
            <Rectangle.Fill>
                <DrawingBrush Stretch="None" TileMode="Tile" Viewport="0,0,2,2" ViewportUnits="Absolute">
                    <DrawingBrush.Drawing>
                        <DrawingGroup>
                            <GeometryDrawing Geometry="M0,0 L2,0 2,2, 0,2Z" Brush="White"/>
                            <GeometryDrawing Geometry="M0,1 L2,1 2,2, 1,2 1,0 0,0Z" Brush="Black"/>
                        </DrawingGroup>
                    </DrawingBrush.Drawing>
                </DrawingBrush>
            </Rectangle.Fill>
        </Rectangle>
    </Canvas>
</Window>

警告:当矩形位于整数坐标上时,这很有效.如果它位于小数坐标(例如Canvas.Left ="10.5"而不是"10"),则刷子将具有抗锯齿并且将失去清晰图案. SnapToDevicePixels无济于事.只要矩形的位置已知,就可以设置DrawingBrush的RelativeTransform来偏移小数分量,以避免消除锯齿.

Answer 2

在Oren的答案的基础上，这是一个紧凑的版本，它绘制了在颜色选择器和其他地方看到的漂亮的方格灰色背景：

<DrawingBrush TileMode="Tile" Viewport="0,0,32,32" ViewportUnits="Absolute">
  <DrawingBrush.Drawing>
    <GeometryDrawing Geometry="M0,0 H1 V1 H2 V2 H1 V1 H0Z" Brush="LightGray"/>
  </DrawingBrush.Drawing>
</DrawingBrush>