/// <summary>
/// Add the 2D projection of the given arc
/// to the current element outline union
/// </summary>
static public bool AddToUnion(
Polygons union,
VertexLookup vl,
Clipper c,
Arc arc)
{
IList <XYZ> pts = arc.Tessellate();
int n = pts.Count;
Polygons faces = new Polygons(1);
Polygon face2d = new Polygon(n);
IntPoint a = vl.GetOrAdd(pts[0]);
face2d.Add(a);
for (int i = 1; i < n; ++i)
{
IntPoint b = vl.GetOrAdd(pts[i]);
if (b != a)
{
face2d.Add(b);
a = b;
}
}
faces.Add(face2d);
return(c.AddPaths(faces, PolyType.ptSubject, true));
}
/// <summary>
/// Return the union of the outermost room boundary
/// loop projected onto the XY plane.
/// </summary>
static public bool AddToUnionRoom(
Polygons union,
List <LineSegment> curves,
VertexLookup vl,
Clipper c,
IList <IList <BoundarySegment> > boundary)
{
int n = boundary.Count;
Debug.Assert(0 < n,
"expected at least one room boundary loop");
Polygons faces = new Polygons(n);
Polygon face2d = new Polygon(boundary[0].Count);
foreach (IList <BoundarySegment> loop in boundary)
{
// Outer curve loops are counter-clockwise
face2d.Clear();
foreach (BoundarySegment s in loop)
{
IList <XYZ> pts = s.GetCurve().Tessellate();
IntPoint a = vl.GetOrAdd(pts[0]);
face2d.Add(a);
n = pts.Count;
for (int i = 1; i < n; ++i)
{
IntPoint b = vl.GetOrAdd(pts[i]);
if (b != a)
{
face2d.Add(b);
a = b;
}
}
faces.Add(face2d);
}
}
return(c.AddPaths(faces, PolyType.ptSubject, true));
}
/// <summary>
/// Add the 2D projection of the given mesh triangles
/// to the current element outline union
/// </summary>
static public bool AddToUnion(
Polygons union,
VertexLookup vl,
Clipper c,
Mesh m)
{
int n = m.NumTriangles;
Polygons triangles = new Polygons(n);
Polygon triangle = new Polygon(3);
for (int i = 0; i < n; ++i)
{
MeshTriangle mt = m.get_Triangle(i);
triangle.Clear();
triangle.Add(vl.GetOrAdd(mt.get_Vertex(0)));
triangle.Add(vl.GetOrAdd(mt.get_Vertex(1)));
triangle.Add(vl.GetOrAdd(mt.get_Vertex(2)));
triangles.Add(triangle);
}
return(c.AddPaths(triangles, PolyType.ptSubject, true));
}
/// <summary>
/// Add the 2D projection of the given face
/// to the current element outline union
/// </summary>
static public bool AddToUnion(
Polygons union,
VertexLookup vl,
Clipper c,
Face f)
{
IList <CurveLoop> loops = f.GetEdgesAsCurveLoops();
// ExporterIFCUtils class can also be used for
// non-IFC purposes. The SortCurveLoops method
// sorts curve loops (edge loops) so that the
// outer loops come first.
IList <IList <CurveLoop> > sortedLoops
= ExporterIFCUtils.SortCurveLoops(loops);
int n = loops.Count;
Debug.Assert(0 < n,
"expected at least one face loop");
Polygons faces = new Polygons(n);
Polygon face2d = new Polygon(loops[0].NumberOfCurves());
//foreach( IList<CurveLoop> loops2
// in sortedLoops )
foreach (CurveLoop loop in loops)
{
// Outer curve loops are counter-clockwise
if (loop.IsCounterclockwise(XYZ.BasisZ))
{
face2d.Clear();
foreach (Curve curve in loop)
{
IList <XYZ> pts = curve.Tessellate();
IntPoint a = vl.GetOrAdd(pts[0]);
face2d.Add(a);
n = pts.Count;
for (int i = 1; i < n; ++i)
{
IntPoint b = vl.GetOrAdd(pts[i]);
if (b != a)
{
face2d.Add(b);
a = b;
}
}
}
faces.Add(face2d);
}
}
return(c.AddPaths(faces, PolyType.ptSubject, true));
}
/// <summary>
/// Return the union of all outlines projected onto
/// the XY plane from the geometry solids and meshes
/// </summary>
static public bool AddToUnion(
Polygons union,
List <LineSegment> curves,
VertexLookup vl,
Clipper c,
GeometryElement geoElem)
{
foreach (GeometryObject obj in geoElem)
{
// Curve
// Edge
// Face
// GeometryElement
// GeometryInstance
// Mesh
// Point
// PolyLine
// Profile
// Solid
// Skip objects that contribute no 2D surface
Curve curve = obj as Curve;
if (null != curve)
{
Arc arc = curve as Arc;
if (null != arc && arc.IsCyclic)
{
AddToUnion(union, vl, c, arc);
}
else if (curve.IsBound)
{
curves.Add(new LineSegment(
vl.GetOrAdd(curve.GetEndPoint(0)),
vl.GetOrAdd(curve.GetEndPoint(1))));
}
continue;
}
Solid solid = obj as Solid;
if (null != solid)
{
foreach (Face f in solid.Faces)
{
// Skip pretty common case: vertical planar face
if (f is PlanarFace &&
Util.IsHorizontal(((PlanarFace)f).FaceNormal))
{
continue;
}
AddToUnion(union, vl, c, f);
}
continue;
}
Mesh mesh = obj as Mesh;
if (null != mesh)
{
AddToUnion(union, vl, c, mesh);
continue;
}
GeometryInstance inst = obj as GeometryInstance;
if (null != inst)
{
GeometryElement txGeoElem
= inst.GetInstanceGeometry(
Transform.Identity); // inst.Transform
AddToUnion(union, curves, vl, c, txGeoElem);
continue;
}
Debug.Assert(false,
"expected only solid, mesh or instance");
}
return(true);
}