Question

我有一个SVG图形，在400x400视图框的中心是一个264x264的正方形，并且正方形周围的68像素填充是图像的重要部分，我希望它出现在WPF中。我正在使用一个库将SVG绘图转换为WPF DrawingImage，在我将其填入页面进行预览之后输出如下：

<Page x:Class="Page1"
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
  xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
  mc:Ignorable="d" 
  d:DesignHeight="400" d:DesignWidth="400"
Title="Page1">

<Image>
    <Image.Source>
        <DrawingImage>
            <DrawingImage.Drawing>
                <DrawingGroup xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:svg="http://sharpvectors.codeplex.com/runtime/">
                    <DrawingGroup.Children>
                        <DrawingGroup>
                            <DrawingGroup.Children>
                                <DrawingGroup>
                                    <DrawingGroup.Children>
                                        <DrawingGroup>
                                            <DrawingGroup.Children>
                                                <GeometryDrawing Brush="#FFAAFFAA">
                                                    <GeometryDrawing.Pen>
                                                        <Pen Brush="#FF000000" Thickness="10" StartLineCap="Flat" EndLineCap="Flat" LineJoin="Miter" />
                                                    </GeometryDrawing.Pen>
                                                    <GeometryDrawing.Geometry>
                                                        <RectangleGeometry RadiusX="0" RadiusY="0" Rect="68,68,264,264" />
                                                    </GeometryDrawing.Geometry>
                                                </GeometryDrawing>
                                            </DrawingGroup.Children>
                                            <DrawingGroup.ClipGeometry>
                                                <RectangleGeometry Rect="0,0,400,400" />
                                            </DrawingGroup.ClipGeometry>
                                            <DrawingGroup.Transform>
                                                <TranslateTransform X="0" Y="0" />
                                            </DrawingGroup.Transform>
                                        </DrawingGroup>
                                    </DrawingGroup.Children>
                                </DrawingGroup>
                            </DrawingGroup.Children>
                            <DrawingGroup.ClipGeometry>
                                <RectangleGeometry Rect="0,0,400,400" />
                            </DrawingGroup.ClipGeometry>
                        </DrawingGroup>
                    </DrawingGroup.Children>
                </DrawingGroup>
            </DrawingImage.Drawing>
        </DrawingImage>
    </Image.Source>
</Image>
</Page>

生成的图像是一个完全填充其容器的正方形，而不是像我想要的那样在它周围留下一些空的空间。如何让WPF保留该空间而不是将其裁剪掉？

Answer 1

使用DrawingImage时，渲染Image时会忽略/裁剪空格。这篇文章讨论了同样的问题：Why is a GeometryDrawing displayed on Canvas with clipped coordinates?

您可以通过将空白空间绘制为绿色矩形后面的透明400x400矩形来实现您想要的效果：

...
<DrawingGroup>
    <DrawingGroup.Children>

        <!-- Added transparent "spacer": -->
        <GeometryDrawing Brush="Transparent">
            <GeometryDrawing.Geometry>
                <RectangleGeometry RadiusX="0" RadiusY="0" Rect="0,0,400,400" />
            </GeometryDrawing.Geometry>
        </GeometryDrawing>

        <!-- This was here before: -->
        <GeometryDrawing Brush="#FFAAFFAA">
            <GeometryDrawing.Pen>
                <Pen Brush="#FF000000" Thickness="10" 
                     StartLineCap="Flat" EndLineCap="Flat" LineJoin="Miter" />
            </GeometryDrawing.Pen>
            <GeometryDrawing.Geometry>
                <RectangleGeometry RadiusX="0" RadiusY="0" Rect="68,68,264,264" />
            </GeometryDrawing.Geometry>
        </GeometryDrawing>
        ...

如何防止WPF裁剪我的矢量图形？

1 个答案: