获得几何长度 [英] Getting Geometry length

问题描述

有谁知道在Pixels中获取WPF几何体长度的有效方法吗？
我知道WPF中的几何图形是基于矢量的，因此实际上没有像素长度。但必须能够根据可见的绘制图像获取长度。我的意思是，如果我在1024x800像素的图像中绘制几何图形，它必须能够获得这些图像的长度。

我错了吗？还是有任何可能和有效获取这些信息的方式？

预先感谢您！

Michael

解决方案

我已经提出了一个解决方案，但不知道这是否是最有效率（最快）的方式。请您在此留下评论 - 谢谢大家。

 公共静态双GetLength进行（这种几何GEO）
 {$！ b $ b PathGeometry path = geo.GetFlattenedPathGeometry（）; 
 
双倍长度= 0.0; 
 
 foreach（PathFigure pf in path.Figures）
 {
 Point start = pf.StartPoint; 
 
的foreach（在pf.Segments PolyLineSegment SEG）
 {
的foreach（在seg.Points点点）
 {
长度+ =距离（开始，点）; 
 start = point; 
} 
} 
} 
 
返回长度; 
} 
 
私有静态双距离（点P1，P2点）
 {
返回Math.Sqrt（Math.Pow（p1.X  -  p2.X， 2）+ Math.Pow（p1.Y  -  p2.Y，2））; 
} 
  

Does anyone know an efficient way of getting the length of a WPF geometry in Pixels? I know that geometries in WPF are vector based and therefore do not really have a pixellength. But it has to be possible to get the length based on the visible drawn image. I mean if I draw some geometries in a 1024x800 pixel image it has to be possible to get the length of those.

Am I wrong here or is there any possible and efficient way of getting these informations?

Thank you in advance!

Michael

解决方案

I have come up with a solution, but don't know if this would be the most efficent (fastest) way of doing so. Please leave your comments on this - thank you all!

    public static double GetLength(this Geometry geo)
    {
        PathGeometry path = geo.GetFlattenedPathGeometry();

        double length = 0.0;

        foreach (PathFigure pf in path.Figures)
        {
            Point start = pf.StartPoint;

            foreach (PolyLineSegment seg in pf.Segments)
            {
                foreach (Point point in seg.Points)
                {
                    length += Distance(start, point);
                    start = point;
                }
            }
        }

        return length;
    }

    private static double Distance(Point p1, Point p2)
    {
        return Math.Sqrt(Math.Pow(p1.X - p2.X,2) + Math.Pow(p1.Y - p2.Y,2));
    }

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