//--------------------------------------------------------------------------------------------------
protected void AddBezierCurve(Geom2d_BezierCurve geom2DBezier, double first, double last, bool reverse)
{
if (geom2DBezier.Degree() > 3)
{
// Try to reduce the order of the curve
var continuity = geom2DBezier.Continuity();
if (continuity != GeomAbs_Shape.GeomAbs_C0)
{
continuity = GeomAbs_Shape.GeomAbs_C1;
}
var converter = new Geom2dConvert_ApproxCurve(geom2DBezier, 0.001 /*Precision.Confusion() * 10*/, continuity, 1000, 3);
if (!(converter.IsDone() && converter.HasResult()))
{
Messages.Warning("SvgExporter: Bezier curve has an undecreasable order of " + geom2DBezier.Degree() + ".");
return;
}
AddBSplineCurve(converter.Curve(), first, last, reverse);
return;
}
// Create segment, SVG path does not support UV
geom2DBezier.Segment(first, last);
Pnt2d c1, c2;
var start = reverse ? geom2DBezier.EndPoint() : geom2DBezier.StartPoint();
var end = reverse ? geom2DBezier.StartPoint() : geom2DBezier.EndPoint();
BoundingBox?.Add(start);
BoundingBox?.Add(end);
switch (geom2DBezier.Degree())
{
case 1:
AddToPath(new SvgPathSegLineto(start, end));
break;
case 2:
c1 = geom2DBezier.Pole(2);
BoundingBox?.Add(c1);
AddToPath(new SvgPathSegCurvetoQuadratic(start, c1, end));
break;
case 3:
c1 = geom2DBezier.Pole(reverse ? 3 : 2);
c2 = geom2DBezier.Pole(reverse ? 2 : 3);
BoundingBox?.Add(c1);
BoundingBox?.Add(c2);
AddToPath(new SvgPathSegCurvetoCubic(start, c1, c2, end));
break;
default:
Messages.Warning("SvgExporter: Bezier curve has an unsupported order of " + geom2DBezier.Degree() + ".");
break;
}
}
//--------------------------------------------------------------------------------------------------
void _AddBezierCurve(Geom2d_BezierCurve geom2DBezier, double firstParameter, double lastParameter)
{
int p1, p2, p3, p4;
switch (geom2DBezier.Degree())
{
case 1:
p1 = _AddPoint(geom2DBezier.StartPoint());
p2 = _AddPoint(geom2DBezier.EndPoint());
_Segments.Add(new SketchSegmentLine(p1, p2));
break;
case 2:
p1 = _AddPoint(geom2DBezier.StartPoint());
p2 = _AddPoint(geom2DBezier.Pole(2), false);
p3 = _AddPoint(geom2DBezier.EndPoint());
_Segments.Add(new SketchSegmentBezier(p1, p2, p3));
break;
case 3:
p1 = _AddPoint(geom2DBezier.StartPoint());
p2 = _AddPoint(geom2DBezier.Pole(2), false);
p3 = _AddPoint(geom2DBezier.Pole(3), false);
p4 = _AddPoint(geom2DBezier.EndPoint());
_Segments.Add(new SketchSegmentBezier(p1, p2, p3, p4));
break;
default:
// Try to reduce the order of the curve
var continuity = geom2DBezier.Continuity();
if (continuity != GeomAbs_Shape.GeomAbs_C0)
{
continuity = GeomAbs_Shape.GeomAbs_C1;
}
var trimmedCurve = new Geom2d_TrimmedCurve(geom2DBezier, firstParameter, lastParameter);
var converter = new Geom2dConvert_ApproxCurve(trimmedCurve, 0.001 /*Precision.Confusion() * 10*/, continuity, 1000, 3);
if (!(converter.IsDone() && converter.HasResult()))
{
Messages.Warning("DxfImporter: Bezier curve has an undecreasable order of " + geom2DBezier.Degree() + ".");
return;
}
_AddBSplineCurve(converter.Curve());
break;
}
}
//--------------------------------------------------------------------------------------------------
public static bool RenderBezierCurve(IDrawingRenderer renderer, Geom2d_BezierCurve bezier, double first, double last, bool reverse)
{
if (renderer.Capabilities.BezierCurveMaxDegree > 0)
{
var maxDegree = Math.Min(3, renderer.Capabilities.BezierCurveMaxDegree);
if (bezier.Degree() > maxDegree)
{
// Try to reduce the order of the curve
var continuity = bezier.Continuity();
if (continuity != GeomAbs_Shape.GeomAbs_C0)
{
continuity = GeomAbs_Shape.GeomAbs_C1;
}
var converter = new Geom2dConvert_ApproxCurve(bezier, 0.0001, continuity, 1000, maxDegree);
if (!(converter.IsDone() && converter.HasResult()))
{
Messages.Warning("BrepRenderHelper: Bezier curve has an undecreasable order of " + bezier.Degree() + ".");
return(false);
}
return(RenderBSplineCurve(renderer, converter.Curve(), first, last, reverse));
}
bezier.Segment(first, last);
Pnt2d c1, c2;
var start = reverse ? bezier.EndPoint() : bezier.StartPoint();
var end = reverse ? bezier.StartPoint() : bezier.EndPoint();
switch (bezier.Degree())
{
case 1:
renderer.Line(start, end);
return(true);
case 2:
c1 = bezier.Pole(2);
renderer.BezierCurve(new[] { start, c1, end });
return(true);
case 3:
c1 = bezier.Pole(reverse ? 3 : 2);
c2 = bezier.Pole(reverse ? 2 : 3);
renderer.BezierCurve(new[] { start, c1, c2, end });
return(true);
default:
Messages.Warning("BrepRenderHelper: Bezier curve has an unsupported order of " + bezier.Degree() + ".");
break;
}
return(false);
}
else
{
// Try to create B-Spline curve
var bsplineCurve = ShapeConstruct.ConvertCurveToBSpline(bezier, first, last, 0.0001, bezier.Continuity(), 10000, 3);
if (bsplineCurve != null)
{
return(RenderBSplineCurve(renderer, bsplineCurve, first, last, reverse));
}
Messages.Warning("BrepRenderHelper: Bezier curve is not supported by exporter and conversion to BSpline failed.");
return(false);
}
}