将几何/路径转换为Minilanguage字符串？

问题描述

追踪如何以编程方式将路径字符串转换为WPF中的路径对象并不难，但有没有内置函数可将几何或路径转换回迷你语言中的字符串？

解决方案

编辑：刚才看到这个，我认为应该有一个叫做其中应该能够做到这一点，事实上也是如此。只需创建其中一个并使用。

---

您可以使用 XamlWriter 类将对象输出为XAML，几何图形将自动缩小为迷你语言。

例如如果这是您的输入：

 < DrawingImage x：Name =segmentsDrawing> 
< DrawingImage.Drawing> 
< DrawingGroup> 
 
< GeometryDrawing Brush =Red> 
< GeometryDrawing.Pen> 
  < GeometryDrawing.Geometry> 
< PathGeometry> 
< PathFigure StartPoint =100,100> 
< PathFigure.Segments> 
< LineSegment Point =100,0/> 
< ArcSegment Point =186.6,150SweepDirection =ClockwiseSize =100,100/> 
< LineSegment Point =100,100/> 
 < / PathFigure> 
< / PathGeometry> 
< /GeometryDrawing.Geometry> 
< / GeometryDrawing> 
 
< GeometryDrawing Brush =Blue> 
< GeometryDrawing.Pen> 
  < GeometryDrawing.Geometry> 
< PathGeometry> 
< PathFigure StartPoint =100,100> 
< PathFigure.Segments> 
< LineSegment Point =186.6,150/> 
< ArcSegment Point =13.4,150SweepDirection =ClockwiseSize =100,100/> 
< LineSegment Point =100,100/> 
 < / PathFigure> 
< / PathGeometry> 
< /GeometryDrawing.Geometry> 
< / GeometryDrawing> 
 
< GeometryDrawing Brush =Green> 
< GeometryDrawing.Pen> 
  < GeometryDrawing.Geometry> 
< PathGeometry> 
< PathFigure StartPoint =100,100> 
< PathFigure.Segments> 
< LineSegment Point =13.4,150/> 
< ArcSegment Point =100,0SweepDirection =ClockwiseSize =100,100/> 
< LineSegment Point =100,100/> 
 < / PathFigure> 
< / PathGeometry> 
< /GeometryDrawing.Geometry> 
< / GeometryDrawing> 
< / DrawingGroup> 
 < / DrawingImage> 
  

...并且您序列化它...

$ b $我们可以使用XmlTextWriter（新的XmlTextWriter）（@C：\Users\Public\Test.xml，new UTF8Encoding（））;
writer.Formatting = Formatting.Indented;
writer.Indentation = 1;
writer.IndentChar ='\t';
XamlWriter.Save（segmentsDrawing，writer）;

...您会得到以下内容：

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

所有 PathGeometry 语言。如果你想在你的应用程序中使用它，我想你可以把它写到 MemoryStream 并通过创建一个 XmlDocument 。

It's not too hard to track down how to programmatically convert path strings into path objects in WPF, but is there a built-in function to convert a geometry or path back to a string in the mini-language?

解决方案

Edit: Looking at this just now i thought that there should be a class called GeometryConverter which should be able to do this, and indeed there is. Just create one of those and use ConvertToString on the geometry you want to convert.

---

You can use the XamlWriter class to output objects as XAML, geometry will automatically be reduced to the mini-language.

e.g. if this is your input:

<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>

...and you serialize it...

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);

...you get the following:

<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>

All the PathGeometry is now in mini-language. If you want to use this right away in your application i suppose you could write it to a MemoryStream and get the data from it by creating a XmlDocument from it.

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