public virtual void DrawArc(double x1, double y1, double x2, double y2, double bulge)
{
double cx, cy, rad;
if (!GeomUtil.GetArcCenterFromBulge(x1, y1, x2, y2, bulge, out cx, out cy))
{
DrawLine(x1, y1, x2, y2);
return;
}
rad = GeomUtil.GetArcRadiusFromBulge(x1, y1, x2, y2, bulge);
DrawEllipticArc(cx, cy, rad, rad, 0.0, GeomUtil.Angle(cx, cy, x1, y1), GeomUtil.GetArcSweepAngleFromBulge(bulge));
}
public virtual void DrawArcT(double x1, double y1, double x2, double y2, double bulge)
{
var t = Transform;
if (t.IsUniform)
{
//the arc will still be an arc after transform
//transform it an draw with standrad arc function
t.Apply(x1, y1, out x1, out y1, true);
t.Apply(x2, y2, out x2, out y2, true);
DrawArc(x1, y1, x2, y2, t.Determinant < 0.0 ? -bulge : bulge); //-buylge to support mirrored arcs
return;
}
else
{ //the arc might change into an elliptic arc
double cx, cy, rad;
if (!GeomUtil.GetArcCenterFromBulge(x1, y1, x2, y2, bulge, out cx, out cy))
{
//the arc is a line
DrawLineT(x1, y1, x2, y2);
return;
}
rad = GeomUtil.GetArcRadiusFromBulge(x1, y1, x2, y2, bulge);
DrawEllipticArcT(cx, cy, rad, rad, 0.0, GeomUtil.Angle(cx, cy, x1, y1), GeomUtil.GetArcSweepAngleFromBulge(bulge));
}
}
