//--------------------------------------------------------------------------------------------------
public static bool RenderCircle(IDrawingRenderer renderer, Geom2d_Circle circle, double first, double last, bool reverse)
{
if (renderer.Capabilities.CircleAsCurve)
{
var bsplineCurve = ShapeConstruct.ConvertCurveToBSpline(circle, first, last, 0.001, GeomAbs_Shape.GeomAbs_C2, 100, 3);
if (bsplineCurve != null)
{
return(RenderBSplineCurve(renderer, bsplineCurve, first, last, reverse));
}
return(false);
}
var center = circle.Location();
var radius = circle.Radius();
double rotation = circle.XAxis().Direction.Angle(Dir2d.DX);
if (circle.Position().Sense() > 0)
{
first = Maths.DoublePI - first;
last = Maths.DoublePI - last;
}
if (reverse)
{
first.Swap(ref last);
}
renderer.Circle(center, radius, first - rotation, last - rotation);
return(true);
}
//--------------------------------------------------------------------------------------------------
void _AddCircle(Geom2d_Circle circle, double first, double last)
{
if (Math.Abs(last - first) < circle.Period())
{
// Circle arc
if (circle.Position().Sense() > 0)
{
var temp = first;
first = last;
last = temp;
}
var entity = new DxfDomCircle(_CurrentLayer, circle.Location(), circle.Radius(), circle.Value(first), circle.Value(last));
_Document.Entities.Add(entity);
}
else
{
// Full circle
var entity = new DxfDomCircle(_CurrentLayer, circle.Location(), circle.Radius());
_Document.Entities.Add(entity);
}
}
//--------------------------------------------------------------------------------------------------
protected void AddCircle(Geom2d_Circle geom2DCircle, double first, double last, bool reverse)
{
if (Math.Abs(last - first) < geom2DCircle.Period())
{
// Circle arc
var start = geom2DCircle.Value(reverse ? last : first);
var end = geom2DCircle.Value(reverse ? first : last);
// Add the midpoint seems to be the simplest way to improve the BB
BoundingBox?.Add(geom2DCircle.Value(first + (last - first) / 2));
// Get parameters of circle
double radius = geom2DCircle.Radius();
double length = last - first;
double halfParameter = (geom2DCircle.LastParameter() - geom2DCircle.FirstParameter()) / 2.0;
var size = (length < halfParameter) ? SvgArcSize.Small : SvgArcSize.Large;
var sweep = geom2DCircle.Position().Sense() > 0
? (reverse ? SvgArcSweep.Negative : SvgArcSweep.Positive)
: (reverse ? SvgArcSweep.Positive : SvgArcSweep.Negative);
AddToPath(new SvgPathSegArc(start, radius, radius, 0.0f, size, sweep, end));
}
else
{
// Complete circle
var circleCenter = geom2DCircle.Location();
var circleRadius = geom2DCircle.Radius();
if (CombineToPath)
{
if (geom2DCircle.Position().Sense() > 0)
{
reverse = !reverse;
}
ClosePath();
var rimPoints = new List <Pnt2d>(4)
{
new Pnt2d(circleCenter.X, circleCenter.Y + circleRadius),
new Pnt2d(circleCenter.X - circleRadius, circleCenter.Y),
new Pnt2d(circleCenter.X, circleCenter.Y - circleRadius),
new Pnt2d(circleCenter.X + circleRadius, circleCenter.Y),
};
SvgArcSweep sweep;
if (reverse)
{
rimPoints.Reverse();
sweep = SvgArcSweep.Positive;
}
else
{
sweep = SvgArcSweep.Negative;
}
AddToPath(new SvgPathSegArc(rimPoints[0], circleRadius, circleRadius, 45.0f, SvgArcSize.Small, sweep, rimPoints[1]));
AddToPath(new SvgPathSegArc(rimPoints[1], circleRadius, circleRadius, 45.0f, SvgArcSize.Small, sweep, rimPoints[2]));
AddToPath(new SvgPathSegArc(rimPoints[2], circleRadius, circleRadius, 45.0f, SvgArcSize.Small, sweep, rimPoints[3]));
AddToPath(new SvgPathSegArc(rimPoints[3], circleRadius, circleRadius, 45.0f, SvgArcSize.Small, sweep, rimPoints[0]));
ClosePath();
}
else
{
CurrentGroup.Children.Add(new SvgCircleElement(circleCenter, circleRadius));
}
// Enlarge BB
var f = geom2DCircle.FirstParameter();
var q = (geom2DCircle.LastParameter() - f) / 4;
BoundingBox?.Add(geom2DCircle.Value(f));
BoundingBox?.Add(geom2DCircle.Value(f + q));
BoundingBox?.Add(geom2DCircle.Value(f + q * 2));
BoundingBox?.Add(geom2DCircle.Value(f + q * 3));
}
}