static public bool edge_rendering_delegate(Edge edge, object edgeLine_path)
{
Path path = edgeLine_path as Path;
ICurve cv = edge.EdgeCurve;
var t_middle = cv.GetParameterAtLength(cv.Length / 2);
var dva = cv.Derivative(t_middle); //求中点的导数
var midPoint = cv[t_middle]; // Common.WpfPoint( cv[t_middle]);
float x = (float)midPoint.X, y = (float)midPoint.Y;
var geo2 = DataDefine.get_svg2();
MatrixTransform mt = new MatrixTransform();
Func <double, double> rad2Deg = v => { return(v * 180 / Math.PI); };
//mt.Matrix.
var deg = rad2Deg(Math.Atan2(dva.Y, dva.X));
var mat = Matrix.Identity;
mat.TranslatePrepend(x, y);
mat.RotatePrepend(deg);
mat.ScalePrepend(-0.2f, 0.2f);
mt.Matrix = mat;
geo2.Transform = mt;
var circle = new EllipseGeometry(new WpfPoint(x, y), 2, 2);
PathGeometry pp = new PathGeometry();
pp.FillRule = FillRule.EvenOdd;
pp.AddGeometry(Common.GetICurveWpfGeometry(cv));
pp.AddGeometry(circle);
pp.AddGeometry(geo2);
path.Data = pp;
return(true);
}
