private static void AddSegmentToPath(Microsoft.Msagl.Splines.ICurve seg, ref System.Drawing.Drawing2D.GraphicsPath p)
{
const float radiansToDegrees = (float)(180.0 / Math.PI);
Microsoft.Msagl.Splines.LineSegment line = seg as Microsoft.Msagl.Splines.LineSegment;
if (line != null)
{
p.AddLine(PointF(line.Start), PointF(line.End));
}
else
{
Microsoft.Msagl.Splines.CubicBezierSegment cb = seg as Microsoft.Msagl.Splines.CubicBezierSegment;
if (cb != null)
{
p.AddBezier(PointF(cb.B(0)), PointF(cb.B(1)), PointF(cb.B(2)), PointF(cb.B(3)));
}
else
{
Microsoft.Msagl.Splines.Ellipse ellipse = seg as Microsoft.Msagl.Splines.Ellipse;
if (ellipse != null)
{
p.AddArc((float)(ellipse.Center.X - ellipse.AxisA.Length), (float)(ellipse.Center.Y - ellipse.AxisB.Length),
(float)(2 * ellipse.AxisA.Length), (float)(2 * ellipse.AxisB.Length), (float)(ellipse.ParStart * radiansToDegrees),
(float)((ellipse.ParEnd - ellipse.ParStart) * radiansToDegrees));
}
}
}
}
private static System.Drawing.Drawing2D.GraphicsPath FillTheGraphicsPath(Microsoft.Msagl.Splines.ICurve iCurve)
{
Microsoft.Msagl.Splines.Curve curve = iCurve as Microsoft.Msagl.Splines.Curve;
System.Drawing.Drawing2D.GraphicsPath path = new System.Drawing.Drawing2D.GraphicsPath();
foreach (Microsoft.Msagl.Splines.ICurve seg in curve.Segments)
{
AddSegmentToPath(seg, ref path);
}
return(path);
}
static bool WithinEpsilon(Microsoft.Msagl.Splines.ICurve bc, double start, double end)
{
int n = 3; //hack !!!!
double d = (end - start) / n;
P2 s = bc[start];
P2 e = bc[end];
return(DistToSegm(bc[start + d], s, e) < epsilon
&&
DistToSegm(bc[start + d * (n - 1)], s, e) < epsilon);
}
internal static List <ObjectWithBox> TessellateCurve(DEdge dedge, double radiusForUnderlyingPolylineCorners)
{
DrawingEdge edge = dedge.DrawingEdge;
Microsoft.Msagl.Splines.ICurve bc = edge.Attr.EdgeCurve;
double lineWidth = edge.Attr.LineWidth;
List <ObjectWithBox> ret = new List <ObjectWithBox>();
int n = 1;
bool done;
do
{
double d = (bc.ParEnd - bc.ParStart) / (double)n;
done = true;
if (n <= 64)//don't break a segment into more than 64 parts
{
for (int i = 0; i < n; i++)
{
if (!WithinEpsilon(bc, d * i, d * (i + 1)))
{
n *= 2;
done = false;
break;
}
}
}
}while (!done);
double del = (bc.ParEnd - bc.ParStart) / n;
for (int j = 0; j < n; j++)
{
Line line = new Line(dedge, bc[del * (double)j], bc[del * (double)(j + 1)], lineWidth);
ret.Add(line);
}
//if (dedge.Label != null)
// ret.Add(new LabelGeometry(dedge.Label, edge.Label.Left,
// edge.Label.Bottom, new P2(edge.Label.Size.Width, edge.Label.Size.Height)));
if (edge.Attr.ArrowAtTarget)
{
ret.Add(new Line(dedge, (P2)edge.Attr.EdgeCurve.End, edge.Attr.ArrowAtTargetPosition, edge.Attr.LineWidth));
}
if (edge.Attr.ArrowAtSource)
{
ret.Add(
new Line(dedge, edge.Attr.EdgeCurve.Start, edge.Attr.ArrowAtSourcePosition, edge.Attr.LineWidth));
}
if (radiusForUnderlyingPolylineCorners > 0)
{
AddUnderlyingPolylineTessellation(ret, dedge, radiusForUnderlyingPolylineCorners);
}
return(ret);
}
