/// <summary>
/// build the shape of the elbow (internal or external) by building the sliding face and building the wire with the given spline
/// </summary>
/// <param name="connectionSpline"> the spline to slide on</param>
/// <param name="bendingAngle">the angle of our future elbow</param>
/// <param name="bendingRadius"> the radius of the elbow</param>
/// <param name="n">modifies the number of triangles</param>
/// <param name="shift">makes the shape begin before 0*pi/180 and end after bendingAngle, we use it to hollow correctly the shape (put 0 for the external part, and something like pi/16 for the internal part)</param>
/// <returns>the shape of the elbow (external or internal part)</returns>
public TopoDS_Shape Build(Geom_BSplineCurve connectionSpline, double bendingAngle, double bendingRadius, double n, double shift)
{
bool firstIteration = true; // check if it is the first iteration
BRepBuilderAPI_MakeWire aMakeWire = new BRepBuilderAPI_MakeWire(); // initialize our wire
gp_Pnt lastPnt = new gp_Pnt(); // initialize our last point
double angle = bendingAngle * Math.PI / 180; // our angle in radian
double lp = connectionSpline.LastParameter(); // often 1
double fp = connectionSpline.FirstParameter(); // often 0
double percentage = (angle + 2 * shift) / (2 * Math.PI); // percentage of the spline to get ( because our spline goes from 0 to 2pi, but we dont want all)
double pas = (lp * percentage - fp) / n; // the step for the iteration on the spline
for (double i = fp; i < lp * percentage; i = i + pas) // fp already includes the small shift if it got any
{
if (firstIteration)
{ // we get our first point
lastPnt = connectionSpline.Value(i);
firstIteration = false;
}
else
{ // and now we add a new edge(last point, current point) on our wire
aMakeWire.Add(new BRepBuilderAPI_MakeEdge(lastPnt, connectionSpline.Value(i)).Edge());
lastPnt = connectionSpline.Value(i);
}
}
// create the pipe with the spline and the section
TopoDS_Wire W = MakeWire(bendingRadius); // the face to be slided
BRepOffsetAPI_MakePipeShell piper = new BRepOffsetAPI_MakePipeShell(aMakeWire.Wire()); // initialize with the wire to slide on
BRepBuilderAPI_TransitionMode Mode = new BRepBuilderAPI_TransitionMode();
Mode = BRepBuilderAPI_TransitionMode.BRepBuilderAPI_RoundCorner;
piper.SetTransitionMode(Mode); // to have a curved shape
piper.Add(W, true, true); // first= true to get a pipe and not something else really weird
piper.Build(); // create the shape
piper.MakeSolid(); //*/
return(piper.Shape());
}
//--------------------------------------------------------------------------------------------------
protected override bool MakeInternal(MakeFlags flags)
{
if (!Segments.Any() || !Points.Any())
{
var makeVertex = new BRepBuilderAPI_MakeVertex(Pnt.Origin);
BRep = makeVertex.Vertex();
HasErrors = false;
return(base.MakeInternal(flags));
}
// Create edges
var freeSegmentEdges = new Dictionary <SketchSegment, TopoDS_Edge>();
foreach (var segmentKvp in _Segments)
{
var segment = segmentKvp.Value;
if (segment.IsAuxilliary)
{
continue;
}
var segEdge = segment.MakeEdge(_Points);
if (segEdge == null)
{
Messages.Warning($"The segment {segmentKvp.Key} of type {segment.GetType().Name} failed creating an edge.");
continue;
}
freeSegmentEdges.Add(segment, segEdge);
AddNamedSubshape("seg", segEdge, segmentKvp.Key);
}
// Create wires
var wires = new List <TopoDS_Wire>();
while (freeSegmentEdges.Any())
{
var nextSegmentEdge = freeSegmentEdges.First();
var frontSegment = nextSegmentEdge.Key;
freeSegmentEdges.Remove(nextSegmentEdge.Key);
var makeWire = new BRepBuilderAPI_MakeWire(nextSegmentEdge.Value);
if ((frontSegment.StartPoint != -1) || (frontSegment.EndPoint != -1))
{
var backSegment = frontSegment;
while (freeSegmentEdges.Any())
{
nextSegmentEdge = freeSegmentEdges.FirstOrDefault(kvp => kvp.Key.IsConnected(frontSegment));
if (nextSegmentEdge.Value != null)
{
frontSegment = nextSegmentEdge.Key;
}
else
{
nextSegmentEdge = freeSegmentEdges.FirstOrDefault(kvp => kvp.Key.IsConnected(backSegment));
if (nextSegmentEdge.Value != null)
{
backSegment = nextSegmentEdge.Key;
}
else
{
// disconnected segment
break;
}
}
makeWire.Add(nextSegmentEdge.Value);
freeSegmentEdges.Remove(nextSegmentEdge.Key);
}
}
// Get wire shape
var wire = makeWire.Wire();
if (wire == null)
{
Messages.Error("Error when creating a wire.");
return(false);
}
wires.Add(wire);
}
// Create resulting shape
var builder = new TopoDS_Builder();
var shape = new TopoDS_Compound();
builder.MakeCompound(shape);
foreach (var wire in wires)
{
builder.Add(shape, wire);
}
BRep = shape;
return(base.MakeInternal(flags));
}