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Add support for ellipses with SemiAxis2 > SemiAxis1

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This commit is contained in:
Thomas Krijnen
2014-03-03 19:07:39 +00:00
parent 05c98de100
commit ec2ed06272
4 changed files with 556 additions and 2 deletions
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src/ifcgeom/IfcGeomCurves.cpp
+14 -2
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@@ -23,6 +23,8 @@
* *
********************************************************************************/
#include <algorithm>
#include <gp_Pnt.hxx>
#include <gp_Vec.hxx>
#include <gp_Dir.hxx>
@@ -96,7 +98,12 @@ bool IfcGeom::convert(const IfcSchema::IfcCircle::ptr l, Handle(Geom_Curve)& cur
bool IfcGeom::convert(const IfcSchema::IfcEllipse::ptr l, Handle(Geom_Curve)& curve) {
double x = l->SemiAxis1() * IfcGeom::GetValue(GV_LENGTH_UNIT);
double y = l->SemiAxis2() * IfcGeom::GetValue(GV_LENGTH_UNIT);
if ( x == 0.0f || y == 0.0f || y > x ) { return false; }
if (x < ALMOST_ZERO || y < ALMOST_ZERO) { return false; }
// Open Cascade does not allow ellipses of which the minor radius
// is greater than the major radius. Hence, in this case, the
// ellipse is rotated. Note that special care needs to be taken
// when creating a trimmed curve off of an ellipse like this.
const bool rotated = y > x;
gp_Trsf trsf;
IfcSchema::IfcAxis2Placement placement = l->Position();
if (placement->is(IfcSchema::Type::IfcAxis2Placement3D)) {
@@ -106,7 +113,12 @@ bool IfcGeom::convert(const IfcSchema::IfcEllipse::ptr l, Handle(Geom_Curve)& cu
IfcGeom::convert((IfcSchema::IfcAxis2Placement2D*)placement,trsf2d);
trsf = trsf2d;
}
gp_Ax2 ax = gp_Ax2().Transformed(trsf);
gp_Ax2 ax = gp_Ax2();
if (rotated) {
ax.Rotate(ax.Axis(), M_PI / 2.);
std::swap(x, y);
}
ax.Transform(trsf);
curve = new Geom_Ellipse(ax, x, y);
return true;
}