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Enhance makeHelix to also support helixes that spiral downwards.

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This commit is contained in:
Markus Lampert 2016-11-28 15:10:25 -08:00
parent 3ce5ea6b35
commit fcc187880e
1 changed files with 5 additions and 2 deletions
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7
src/Mod/Part/App/TopoShape.cpp
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@ -1659,12 +1659,15 @@ TopoDS_Shape TopoShape::makeHelix(Standard_Real pitch, Standard_Real height,
Standard_Boolean leftHanded,
Standard_Boolean newStyle) const
{
if (pitch < Precision::Confusion())
if (fabs(pitch) < Precision::Confusion())
Standard_Failure::Raise("Pitch of helix too small");
if (height < Precision::Confusion())
if (fabs(height) < Precision::Confusion())
Standard_Failure::Raise("Height of helix too small");
if ((height > 0 && pitch < 0) || (height < 0 && pitch > 0))
Standard_Failure::Raise("Pitch and height of helix not compatible");
gp_Ax2 cylAx2(gp_Pnt(0.0,0.0,0.0) , gp::DZ());
Handle_Geom_Surface surf;
if (angle < Precision::Confusion()) {