wpf - 将几何/路径转换为迷你语言字符串？

Question

追踪如何以编程方式将路径字符串转换为 WPF 中的路径对象并不太难，但是是否有内置函数将几何或路径转换回迷你语言中的字符串？

Answer 1

编辑:刚才看这个我觉得应该有一个类叫 GeometryConverter 这应该能够做到这一点，而且确实有。只需创建其中之一并使用 ConvertToString 在要转换的几何体上。

您可以使用 XamlWriter 类以 XAML 格式输出对象，几何图形将自动简化为迷你语言。

例如如果这是您的输入:

<DrawingImage x:Name="segmentsDrawing">
    <DrawingImage.Drawing>
        <DrawingGroup>

            <GeometryDrawing Brush="Red">
                <GeometryDrawing.Pen>
                    <Pen Brush="Black" />
                </GeometryDrawing.Pen>
                <GeometryDrawing.Geometry>
                    <PathGeometry>
                        <PathFigure StartPoint="100,100">
                            <PathFigure.Segments>
                                <LineSegment Point="100,0"/>
                                <ArcSegment Point="186.6,150"  SweepDirection="Clockwise" Size="100,100"/>
                                <LineSegment Point="100,100"/>
                            </PathFigure.Segments>
                        </PathFigure>
                    </PathGeometry>
                </GeometryDrawing.Geometry>
            </GeometryDrawing>

            <GeometryDrawing Brush="Blue">
                <GeometryDrawing.Pen>
                    <Pen Brush="Black"/>
                </GeometryDrawing.Pen>
                <GeometryDrawing.Geometry>
                    <PathGeometry>
                        <PathFigure StartPoint="100,100">
                            <PathFigure.Segments>
                                <LineSegment Point="186.6,150"/>
                                <ArcSegment Point="13.4,150" SweepDirection="Clockwise" Size="100,100"/>
                                <LineSegment Point="100,100"/>
                            </PathFigure.Segments>
                        </PathFigure>
                    </PathGeometry>
                </GeometryDrawing.Geometry>
            </GeometryDrawing>

            <GeometryDrawing Brush="Green">
                <GeometryDrawing.Pen>
                    <Pen Brush="Black"/>
                </GeometryDrawing.Pen>
                <GeometryDrawing.Geometry>
                    <PathGeometry>
                        <PathFigure StartPoint="100,100">
                            <PathFigure.Segments>
                                <LineSegment Point="13.4,150"/>
                                <ArcSegment Point="100,0" SweepDirection="Clockwise" Size="100,100"/>
                                <LineSegment Point="100,100"/>
                            </PathFigure.Segments>
                        </PathFigure>
                    </PathGeometry>
                </GeometryDrawing.Geometry>
            </GeometryDrawing>
        </DrawingGroup>
    </DrawingImage.Drawing>
</DrawingImage>

......然后你将它序列化......

XmlTextWriter writer = new XmlTextWriter(@"C:\Users\Public\Test.xml", new UTF8Encoding());
writer.Formatting = Formatting.Indented;
writer.Indentation = 1;
writer.IndentChar = '\t';
XamlWriter.Save(segmentsDrawing, writer);

...你得到以下信息:

<DrawingImage xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
    <DrawingImage.Drawing>
        <DrawingGroup>
            <DrawingGroup.Children>
                <GeometryDrawing Brush="#FFFF0000">
                    <GeometryDrawing.Pen>
                        <Pen Brush="#FF000000" />
                    </GeometryDrawing.Pen>
                    <GeometryDrawing.Geometry>
                        <PathGeometry Figures="M100,100L100,0A100,100,0,0,1,186.6,150L100,100" />
                    </GeometryDrawing.Geometry>
                </GeometryDrawing>
                <GeometryDrawing Brush="#FF0000FF">
                    <GeometryDrawing.Pen>
                        <Pen Brush="#FF000000" />
                    </GeometryDrawing.Pen>
                    <GeometryDrawing.Geometry>
                        <PathGeometry Figures="M100,100L186.6,150A100,100,0,0,1,13.4,150L100,100" />
                    </GeometryDrawing.Geometry>
                </GeometryDrawing>
                <GeometryDrawing Brush="#FF008000">
                    <GeometryDrawing.Pen>
                        <Pen Brush="#FF000000" />
                    </GeometryDrawing.Pen>
                    <GeometryDrawing.Geometry>
                        <PathGeometry Figures="M100,100L13.4,150A100,100,0,0,1,100,0L100,100" />
                    </GeometryDrawing.Geometry>
                </GeometryDrawing>
            </DrawingGroup.Children>
        </DrawingGroup>
    </DrawingImage.Drawing>
</DrawingImage>

所有 PathGeometry现在是迷你语言。如果您想立即在您的应用程序中使用它，我想您可以将它写入 MemoryStream并通过创建 XmlDocument 从中获取数据从中。