如何解决WPF GeometryDrawing的画笔始终仅是透明的
这是一个测试应用,仅在窗口中显示阴影线椭圆。不管我怎么写,椭圆的背景都是透明的。不是我设置GeometryDrawing的颜色。我很沮丧生成的图片将椭圆的背景显示为绿色时应显示为透明。
<Window x:Class="MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:WpfApp2"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
Title="MainWindow"
Background="Red"
mc:Ignorable="d">
<Window.Resources>
<ResourceDictionary>
<DrawingBrush x:Key="HatchBrush"
Stretch="UniformToFill"
TileMode="Tile"
Viewbox="0 0 10 10"
ViewboxUnits="Absolute"
Viewport="0 0 10 10"
ViewportUnits="Absolute">
<DrawingBrush.Drawing>
<GeometryDrawing Brush="Green">
<GeometryDrawing.Geometry>
<GeometryGroup>
<LineGeometry StartPoint="0 0"
EndPoint="10 0" />
<LineGeometry StartPoint="0 0"
EndPoint="0 10" />
</GeometryGroup>
</GeometryDrawing.Geometry>
<GeometryDrawing.Pen>
<Pen Brush="Yellow"
EndLineCap="Square"
StartLineCap="Square"
Thickness="3" />
</GeometryDrawing.Pen>
</GeometryDrawing>
</DrawingBrush.Drawing>
</DrawingBrush>
</ResourceDictionary>
</Window.Resources>
<Grid Margin="5"
HorizontalAlignment="Stretch"
VerticalAlignment="Stretch">
<Ellipse x:Name="c_Ellipse"
HorizontalAlignment="Stretch"
VerticalAlignment="Stretch"
Fill="{StaticResource HatchBrush}"
Stroke="Black" />
</Grid>
</Window>
椭圆的背景应为绿色:
<GeometryDrawing Brush="Green">
解决方法
没有使用几何图形的Brush
的填充几何。
您可以使用RectangleGeometry而不是两个LineGeometries:
<GeometryDrawing Brush="Green">
<GeometryDrawing.Geometry>
<RectangleGeometry Rect="0,10,10"/>
</GeometryDrawing.Geometry>
<GeometryDrawing.Pen>
<Pen Brush="Yellow" Thickness="1.5"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
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