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Part: Compute center of gravity for compounds

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* If the compound contains solids then other shape types like faces or edges are ignored
* If the compound contains no solids but faces then edges are ignored
* If the compound contains no faces but edges then vertexes are ignored
This commit is contained in:
wmayer
2023-03-02 18:32:08 +01:00
committed by wwmayer
parent b062b22b09
commit ebe791649a
1 changed files with 51 additions and 20 deletions
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71
src/Mod/Part/App/TopoShape.cpp
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@@ -1174,34 +1174,65 @@ Base::BoundBox3d TopoShape::getBoundBox() const
return box;
}
namespace {
bool getShapeProperties(const TopoDS_Shape& shape, GProp_GProps& prop)
{
TopExp_Explorer xpSolid(shape, TopAbs_SOLID);
if (xpSolid.More()) {
BRepGProp::VolumeProperties(shape, prop);
return true;
}
TopExp_Explorer xpFace(shape, TopAbs_FACE);
if (xpFace.More()) {
BRepGProp::SurfaceProperties(shape, prop);
return true;
}
TopExp_Explorer xpEdge(shape, TopAbs_EDGE);
if (xpEdge.More()) {
BRepGProp::LinearProperties(shape, prop);
return true;
}
TopExp_Explorer xpVert(shape, TopAbs_VERTEX);
if (xpVert.More()) {
gp_Pnt pnts;
int count = 0;
for (; xpVert.More(); xpVert.Next()) {
count++;
gp_Pnt pnt = BRep_Tool::Pnt(TopoDS::Vertex(xpVert.Current()));
pnts.SetX(pnts.X() + pnt.X());
pnts.SetY(pnts.Y() + pnt.Y());
pnts.SetZ(pnts.Z() + pnt.Z());
}
pnts.SetX(pnts.X() / count);
pnts.SetY(pnts.Y() / count);
pnts.SetZ(pnts.Z() / count);
prop = GProp_GProps(pnts);
return true;
}
return false;
}
}
bool TopoShape::getCenterOfGravity(Base::Vector3d& center) const
{
if (_Shape.IsNull())
return false;
// Computing of CentreOfMass
gp_Pnt pnt;
if (_Shape.ShapeType() == TopAbs_VERTEX) {
pnt = BRep_Tool::Pnt(TopoDS::Vertex(_Shape));
}
else {
GProp_GProps prop;
if (_Shape.ShapeType() == TopAbs_EDGE || _Shape.ShapeType() == TopAbs_WIRE) {
BRepGProp::LinearProperties(_Shape, prop);
}
else if (_Shape.ShapeType() == TopAbs_FACE || _Shape.ShapeType() == TopAbs_SHELL) {
BRepGProp::SurfaceProperties(_Shape, prop);
}
else {
BRepGProp::VolumeProperties(_Shape, prop);
}
pnt = prop.CentreOfMass();
GProp_GProps prop;
if (getShapeProperties(_Shape, prop)) {
gp_Pnt pnt = prop.CentreOfMass();
center.Set(pnt.X(), pnt.Y(), pnt.Z());
return true;
}
center.Set(pnt.X(), pnt.Y(), pnt.Z());
return true;
return false;
}
void TopoShape::Save (Base::Writer& writer) const