Question

是否有人知道是否可以将DrawingContext保存或转换为Geometry？

E.g。之后

using (DrawingContext dc = RenderOpen())
{
    dc.DrawLine(penSelected, Data.MidTop, Data.MidTop + vertical);
    dc.DrawLine(pen, Data.MidTop - horizontal, Data.MidTop + thickness);
    dc.DrawLine(pen, Data.MidTop + vertical - thickness, Data.MidTop + horizontal + vertical);
    dc.DrawText(new FormattedText(Data.Time2.ToString("0.0"), cultureinfo, FlowDirection.LeftToRight, typeface, 8, Brushes.Black),
        Data.MidTop + 3 * thickness);
    dc.DrawText(new FormattedText(Data.Time2.ToString("0.0"), cultureinfo, FlowDirection.LeftToRight, typeface, 8, Brushes.Black),
        Data.MidTop + vertical - horizontal - 3 * thickness);
}

以某种方式将绘制的对象保存在几何体中？

Answer 1

当您使用可视内容填充DrawingVisual时，您实际上正在创建Drawing对象的分层集合，这些对象可由DrawingVisual的Drawing属性（DrawingGroup类型）访问。这些Drawing对象中的每一个实际上都是以下类型之一：

GeometryDrawing
GlyphRunDrawing
ImageDrawing
VideoDrawing
DrawingGroup

其中两个提供了获取几何的属性或方法。显然，GeometryDrawing具有Geometry属性，而GlyphRunDrawing具有GlyphRun属性，该属性返回GlyphRun对象，而该对象又具有BuildGeometry方法。此方法返回GlyphRun文本轮廓的几何。

从DrawingGroup创建Geometry的静态帮助器方法可能如下所示：

public static Geometry CreateGeometry(DrawingGroup drawingGroup)
{
    var geometry = new GeometryGroup();

    foreach (var drawing in drawingGroup.Children)
    {
        if (drawing is GeometryDrawing)
        {
            geometry.Children.Add(((GeometryDrawing)drawing).Geometry);
        }
        else if (drawing is GlyphRunDrawing)
        {
            geometry.Children.Add(((GlyphRunDrawing)drawing).GlyphRun.BuildGeometry());
        }
        else if (drawing is DrawingGroup)
        {
            geometry.Children.Add(CreateGeometry((DrawingGroup)drawing));
        }
    }

    geometry.Transform = drawingGroup.Transform;
    return geometry;
}

您只需将DrawingVisual的Drawing属性的值传递给此方法：

var geometry = CreateGeometry(visual.Drawing);

将DrawingContext转换为Geometry？

1 个答案: