//--------------------------------------------------------------------------------------------------
void _ImportArcSegment(SvgPathSegArc svgSegment, ref int startPoint)
{
var radiusX = svgSegment.RadiusX;
var radiusY = svgSegment.RadiusY;
var rotation = -svgSegment.Angle.ToRad();
var startPnt2d = svgSegment.Start;
var endPnt2d = svgSegment.End;
var centerPnt2d = Geom2dUtils.FindEllipseCenterFromEndpoints(
startPnt2d, endPnt2d,
radiusX, radiusY, rotation,
(int)svgSegment.Size != (int)svgSegment.Sweep);
// Do we have a circle arc?
if (Math.Abs(radiusX - radiusY) < 0.0001)
{
var axis = Ax2d.OX.Rotated(Pnt2d.Origin, rotation).Translated(centerPnt2d.ToVec());
var circ = new gp_Circ2d(axis, radiusX, svgSegment.Sweep != SvgArcSweep.Positive);
//Debug.WriteLine("StartParam: {0} - EndParam: {1}", ElCLib.Parameter(circ, startPnt2d), ElCLib.Parameter(circ, endPnt2d));
var startParam = ElCLib.Parameter(circ, startPnt2d);
var endParam = ElCLib.Parameter(circ, endPnt2d);
if (endParam < startParam)
{
endParam += 2 * Math.PI;
}
var rimPnt2d = ElCLib.Value(startParam + (endParam - startParam) / 2, circ);
var endPoint = _AddPoint(endPnt2d);
_Segments.Add(new SketchSegmentArc(startPoint, endPoint, _AddPoint(rimPnt2d)));
startPoint = endPoint;
}
else
{
// No, we have a elliptical arc
// Construct ellipse, convert to bezier
var axis = Ax2d.OX.Rotated(Pnt2d.Origin, rotation).Translated(centerPnt2d.ToVec());
var ellipse = new gp_Elips2d(axis, radiusX, radiusY, svgSegment.Sweep != SvgArcSweep.Positive);
var startParam = ElCLib.Parameter(ellipse, startPnt2d);
var endParam = ElCLib.Parameter(ellipse, endPnt2d);
if (double.IsNaN(startParam) || double.IsNaN(endParam))
{
Messages.Warning("Invalid elliptical arc found in SVG file.");
return;
}
var bezierPointArray = Geom2dUtils.EllipticalArcToBezier(ellipse, startParam, endParam);
foreach (var bezierPoints in bezierPointArray)
{
var endPoint = _AddPoint(bezierPoints.p2);
_Segments.Add(new SketchSegmentBezier(startPoint, _AddPoint(bezierPoints.c1), _AddPoint(bezierPoints.c2), endPoint));
startPoint = endPoint;
}
}
}
//--------------------------------------------------------------------------------------------------
void _ImportEllipticalArc(DxfDomEllipse dxfEllipse)
{
var centerPoint = dxfEllipse.CenterPoint;
var majorRimPoint = centerPoint.Translated(dxfEllipse.MajorAxisPointOffset.ToVec());
var minorRimPoint = centerPoint.Translated(dxfEllipse.MajorAxisPointOffset.ToVec().Rotated(90.0.ToRad()).Scaled(dxfEllipse.Ratio));
var ellipse = Geom2dUtils.MakeEllipse(centerPoint, majorRimPoint, minorRimPoint);
var bezierPointArray = Geom2dUtils.EllipticalArcToBezier(ellipse, dxfEllipse.StartParameter, dxfEllipse.EndParameter);
foreach (var bezierPoints in bezierPointArray)
{
var startPoint = _AddPoint(bezierPoints.p1);
var endPoint = _AddPoint(bezierPoints.p2);
_Segments.Add(new SketchSegmentBezier(startPoint, _AddPoint(bezierPoints.c1, false), _AddPoint(bezierPoints.c2, false), endPoint));
}
}