//--------------------------------------------------------------------------------------------------
public static bool RenderEllipse(IDrawingRenderer renderer, Geom2d_Ellipse ellipse, double first, double last, bool reverse)
{
if (renderer.Capabilities.EllipseAsCurve)
{
var bsplineCurve = ShapeConstruct.ConvertCurveToBSpline(ellipse, first, last, 0.001, GeomAbs_Shape.GeomAbs_C1, 100, 3);
if (bsplineCurve != null)
{
return(RenderBSplineCurve(renderer, bsplineCurve, first, last, reverse));
}
return(false);
}
var center = ellipse.Location();
var majorRadius = ellipse.MajorRadius();
var minorRadius = ellipse.MinorRadius();
double rotation = ellipse.XAxis().Direction.Angle(Dir2d.DX);
if (ellipse.Position().Sense() > 0)
{
first = Maths.DoublePI - first;
last = Maths.DoublePI - last;
}
if (reverse)
{
first.Swap(ref last);
}
renderer.Ellipse(center, majorRadius, minorRadius, rotation, first, last);
return(false);
}
//--------------------------------------------------------------------------------------------------
protected void AddEllipse(Geom2d_Ellipse geom2DEllipse, double first, double last, bool reverse)
{
if (Math.Abs(last - first) < geom2DEllipse.Period())
{
// Ellipse arc
var start = geom2DEllipse.Value(reverse ? last : first);
var end = geom2DEllipse.Value(reverse ? first : last);
// Add the midpoint seems to be the simplest way to improve the BB
BoundingBox?.Add(geom2DEllipse.Value(first + (last - first) / 2));
// Get parameters of ellipse
double radiusX = geom2DEllipse.MajorRadius();
double radiusY = geom2DEllipse.MinorRadius();
double angleX = Maths.NormalizeAngleDegree(geom2DEllipse.XAxis().Angle(Ax2d.OX).ToDeg());
double length = last - first;
double halfParameter = (geom2DEllipse.LastParameter() - geom2DEllipse.FirstParameter()) / 2.0;
var size = (length < halfParameter) ? SvgArcSize.Small : SvgArcSize.Large;
var sweep = geom2DEllipse.Position().Sense() > 0
? (reverse ? SvgArcSweep.Negative : SvgArcSweep.Positive)
: (reverse ? SvgArcSweep.Positive : SvgArcSweep.Negative);
AddToPath(new SvgPathSegArc(start, radiusX, radiusY, angleX, size, sweep, end));
}
else
{
// Complete ellipse
if (reverse)
{
geom2DEllipse = geom2DEllipse.Reversed() as Geom2d_Ellipse;
}
double rotationAngle = geom2DEllipse.XAxis().Angle(Ax2d.OX);
var segment = new SvgEllipseElement(geom2DEllipse.Location(), geom2DEllipse.MajorRadius(), geom2DEllipse.MinorRadius());
segment.Transforms.Add(new SvgRotateTransform(Maths.NormalizeAngleDegree(rotationAngle.ToDeg())));
CurrentGroup.Children.Add(segment);
// Enlarge BB
var f = geom2DEllipse.FirstParameter();
var q = (geom2DEllipse.LastParameter() - f) / 4;
BoundingBox?.Add(geom2DEllipse.Value(f));
BoundingBox?.Add(geom2DEllipse.Value(f + q));
BoundingBox?.Add(geom2DEllipse.Value(f + q * 2));
BoundingBox?.Add(geom2DEllipse.Value(f + q * 3));
}
}
//--------------------------------------------------------------------------------------------------
void _AddEllipse(Geom2d_Ellipse ellipse, double first, double last)
{
if (_Document.Flags.HasFlag(DxfFlags.ExportEllipseAsPolygon))
{
if (Math.Abs(last - first) < ellipse.Period())
{
// Elliptical arc
var trimmedCurve = new Geom2d_TrimmedCurve(ellipse, first, last);
_AddPolygonCurve(trimmedCurve);
}
else
{
// Full ellipse
_AddPolygonCurve(ellipse);
}
return;
}
var center = ellipse.Location();
var majorAxisPointOffset = ellipse.XAxis().Direction.ToVec().Multiplied(ellipse.MajorRadius());
var ratio = ellipse.MinorRadius() / ellipse.MajorRadius();
if (Math.Abs(last - first) < ellipse.Period())
{
// Elliptical arc
if (ellipse.Position().Sense() > 0)
{
var temp = first;
first = ellipse.Period() - last;
last = ellipse.Period() - temp;
}
var entity = new DxfDomEllipse(_CurrentLayer, center, majorAxisPointOffset.ToPnt(), ratio, first, last);
_Document.Entities.Add(entity);
}
else
{
// Full ellipse
var entity = new DxfDomEllipse(_CurrentLayer, center, majorAxisPointOffset.ToPnt(), ratio);
_Document.Entities.Add(entity);
}
}