void WriteBezierSegment(CubicBezierSegment bs) {
WriteStartElement(GeometryToken.CubicBezierSegment);
WriteAttribute(GeometryToken.Points, PointsToString(bs.B(0), bs.B(1), bs.B(2), bs.B(3)));
WriteEndElement();
}
string CubicBezierSegmentToString(CubicBezierSegment cubic, char previousInstruction) {
var str = PointsToString(cubic.B(1), cubic.B(2), cubic.B(3));
return previousInstruction=='C'?str:"C"+str;
}
string CubicBezierSegmentToString(CubicBezierSegment cubic)
{
return "C" + PointsToString(cubic.B(1), cubic.B(2), cubic.B(3));
}
private bool BezierSegIntersectsBoundary(CubicBezierSegment seg) {
double side = Point.SignedDoubledTriangleArea(seg.B(0), seg.B(1), seg.B(2));
if (side > 0)
return BezierSegIntersectsTree(seg, thinLeftHierarchy) || BezierSegIntersectsTree(seg, leftHierarchy);
else
return BezierSegIntersectsTree(seg, thinRightHierarchy) || BezierSegIntersectsTree(seg, rightHierarchy);
}
static GraphicsPath CreateControlPointPolygon(Tuple<double, double> t, CubicBezierSegment cubic){
var gp = new GraphicsPath();
gp.AddLines(new[]{PP(cubic.B(0)), PP(cubic.B(1)), PP(cubic.B(2)), PP(cubic.B(3))});
return gp;
}
internal static void DrawControlPoints(Graphics g, CubicBezierSegment bs){
using (var pen = new Pen(Color.Green, (float) (1.0/1000.0))){
pen.DashPattern = new[]{1, (float) 1};
pen.DashStyle = DashStyle.Dot;
g.DrawLine(pen, PointF(bs.B(0)), PointF(bs.B(1)));
g.DrawLine(pen, PointF(bs.B(1)), PointF(bs.B(2)));
g.DrawLine(pen, PointF(bs.B(2)), PointF(bs.B(3)));
}
}
static void DrawBezier(DGraph graphToDraw, Pen myPen, Graphics g, CubicBezierSegment bs){
g.DrawBezier(myPen, (float) bs.B(0).X, (float) bs.B(0).Y,
(float) bs.B(1).X, (float) bs.B(1).Y,
(float) bs.B(2).X, (float) bs.B(2).Y,
(float) bs.B(3).X, (float) bs.B(3).Y);
if(graphToDraw.DrawingGraph.ShowControlPoints)
DrawControlPoints(g, bs);
}