//--------------------------------------------------------------------------------------------------
void _AddBSplineCurve(Geom2d_BSplineCurve bspline, double first, double last)
{
// Cut spline
bspline = Geom2dConvert.SplitBSplineCurve(bspline, first, last, 0.00001);
if (_Document.Flags.HasFlag(DxfFlags.ExportSplineAsPolygon))
{
_AddPolygonCurve(bspline);
return;
}
if (bspline.Degree() > 3)
{
// Try to reduce the order of the curve
var continuity = bspline.Continuity();
if (continuity != GeomAbs_Shape.GeomAbs_C0)
{
continuity = GeomAbs_Shape.GeomAbs_C1;
}
var converter = new Geom2dConvert_ApproxCurve(bspline, _Precision * 10.0, continuity, 100, 3);
if (!(converter.IsDone() && converter.HasResult()))
{
Messages.Warning("DxfExporter: BSpline curve has an undecreasable degree of " + bspline.Degree() + ".");
return;
}
bspline = converter.Curve();
}
var knotSource = bspline.KnotSequence();
var knots = new double[knotSource.Length()];
int sourceStart = knotSource.Lower();
for (int i = 0; i < knots.Length; i++)
{
knots[i] = knotSource.Value(sourceStart + i);
}
var points = new Pnt2d[bspline.NbPoles()];
var weights = new double[points.Length];
for (int i = 0; i < bspline.NbPoles(); i++)
{
points[i] = bspline.Pole(i + 1);
weights[i] = bspline.Weight(i + 1);
}
var flags = DxfDomSpline.SplineFlags.None;
if (bspline.IsRational())
{
flags = flags.Added(DxfDomSpline.SplineFlags.IsRational);
}
var entity = new DxfDomSpline(_CurrentLayer, bspline.Degree(), knots, points, weights, flags);
_Document.Entities.Add(entity);
}
//--------------------------------------------------------------------------------------------------
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;
}
}
//--------------------------------------------------------------------------------------------------
void _AddPolygonCurve(Geom2d_Curve curve)
{
var converter = new Geom2dConvert_ApproxCurve(curve, _Precision, GeomAbs_Shape.GeomAbs_C0, 500, 1);
if (!(converter.IsDone() && converter.HasResult()))
{
Messages.Error($"Cannot tesselate curve to polyline.");
return;
}
var approx = converter.Curve();
var points = new Pnt2d[approx.NbPoles()];
for (int i = 0; i < points.Length; i++)
{
points[i] = approx.Pole(i + 1);
}
var entity = new DxfDomLwPolyline("0", points);
_Document.Entities.Add(entity);
}
//--------------------------------------------------------------------------------------------------
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);
}
}
//--------------------------------------------------------------------------------------------------
public static bool RenderBSplineCurve(IDrawingRenderer renderer, Geom2d_BSplineCurve bspline, double first, double last, bool reverse)
{
if (renderer.Capabilities.BSplineCurveMaxDegree > 0)
{
bspline = Geom2dConvert.SplitBSplineCurve(bspline, first, last, 0.00001);
if (bspline.Degree() > renderer.Capabilities.BSplineCurveMaxDegree)
{
// Try to reduce the order of the curve
var continuity = bspline.Continuity();
if (continuity != GeomAbs_Shape.GeomAbs_C0)
{
continuity = GeomAbs_Shape.GeomAbs_C1;
}
var converter = new Geom2dConvert_ApproxCurve(bspline, 0.0001, continuity, 100, 3);
if (!(converter.IsDone() && converter.HasResult()))
{
Messages.Warning("BrepRenderHelper: BSpline curve has an undecreasable degree of " + bspline.Degree() + ".");
return(false);
}
bspline = converter.Curve();
}
var knotSource = bspline.KnotSequence();
var knots = new double[knotSource.Length()];
int sourceStart = knotSource.Lower();
for (int i = 0; i < knots.Length; i++)
{
knots[i] = knotSource.Value(sourceStart + i);
}
var points = new Pnt2d[bspline.NbPoles()];
var weights = new double[points.Length];
for (int i = 0; i < bspline.NbPoles(); i++)
{
points[i] = bspline.Pole(i + 1);
weights[i] = bspline.Weight(i + 1);
}
renderer.BSplineCurve(bspline.Degree(), knots, points, weights, bspline.IsRational());
return(true);
}
else
{
// Cannot render BSpline, Try bezier
var converter = new Geom2dConvert_BSplineCurveToBezierCurve(bspline, first, last, 0.001 /*Precision.PConfusion() * 10*/);
bool result = true;
if (reverse)
{
for (int i = converter.NbArcs(); i >= 1; i -= 1)
{
var arc = converter.Arc(i);
result &= RenderBezierCurve(renderer, arc, arc.FirstParameter(), arc.LastParameter(), true);
}
}
else
{
for (int i = 1; i <= converter.NbArcs(); i += 1)
{
var arc = converter.Arc(i);
result &= RenderBezierCurve(renderer, arc, arc.FirstParameter(), arc.LastParameter(), false);
}
}
return(result);
}
}
