//--------------------------------------------------------------------------------------------------
TopoDS_Face _MakeBendSectionFace(MakeContext context)
{
if (_Relief == ReliefFlags.None)
{
return(context.FlangeFace);
}
if (context.OppositeEdge == null)
{
Messages.Error("No opposite edge found for building relief.");
return(null);
}
if (_Relief.HasFlag(Relief & ReliefFlags.Rectangular))
{
// Get notch depth = half distance between both bend and op edge
var distTool = new BRepExtrema_DistShapeShape(context.BendEdge, context.OppositeEdge);
var notchDepth = distTool.Value() * 0.5;
var notchVector = context.TopDirection.ToVec().Multiplied(-notchDepth);
// Get edge points
var points = new Pnt[4];
var bendEdgeAdaptor = new BRepAdaptor_Curve(context.BendEdge);
points[0] = bendEdgeAdaptor.Value(bendEdgeAdaptor.FirstParameter());
points[1] = bendEdgeAdaptor.Value(bendEdgeAdaptor.LastParameter());
var opEdgeAdaptor = new BRepAdaptor_Curve(context.OppositeEdge);
points[2] = opEdgeAdaptor.Value(opEdgeAdaptor.LastParameter());
points[3] = opEdgeAdaptor.Value(opEdgeAdaptor.FirstParameter());
// Move
if (_Relief.HasFlag(ReliefFlags.OppositeSide))
{
notchVector.Reverse();
points[2].Translate(notchVector);
points[3].Translate(notchVector);
}
else
{
points[0].Translate(notchVector);
points[1].Translate(notchVector);
}
// Make face
return(TopoUtils.MakeFace(points));
}
return(null);
}
//--------------------------------------------------------------------------------------------------
bool _AddSectionToResult(MakeContext context, Section section, Trsf transformation)
{
if (section.IsBendSection)
{
// Calculate k-factor and bend allowance
// k = 0.65 + 0.5 * log(r/s)
// This is DIN/ISO value range of 0..2
var thickness = section.BendParameter.Radii[0].Distance(section.BendParameter.Radii[1]).Abs();
var radius = Math.Min(section.BendParameter.Radii[0], section.BendParameter.Radii[1]);
var kfac = (0.65 + 0.5 * Math.Log10(radius / thickness)).Clamp(0.0, 1.0);
var bendAllowance = (radius + thickness * 0.5 * kfac) * section.BendParameter.AngleRad;
if (context.DebugOutput)
{
Messages.Trace($"The bend section has following parameters: thickness {thickness} radius {radius} kfactor {kfac} angle {section.BendParameter.AngleRad} bend allowance {bendAllowance}.");
}
var axes = new []
{
section.BendParameter.Axes[0],
section.BendParameter.Axes[1]
};
// Which side of the bend section is our in-side?
// A point translated along the XDirection of the axis using one of the radii must be on the edge.
var swapSign = 1.0;
var edgeAdaptor = new BRepAdaptor_Curve(section.BendParameter.ConnectedInSharedEdges[0]);
var pnt0 = axes[0].Location.Translated(axes[0].XDirection.ToVec() * section.BendParameter.Radii[0]);
var pnt1 = axes[0].Location.Translated(axes[0].XDirection.ToVec() * section.BendParameter.Radii[1]);
if (!(edgeAdaptor.Line().Contains(pnt0, 0.000001) || edgeAdaptor.Line().Contains(pnt1, 0.000001)))
{
swapSign = -1.0;
axes[0].Rotate(section.BendParameter.Axes[0].Axis, section.BendParameter.AngleRad);
axes[1].Rotate(section.BendParameter.Axes[1].Axis, section.BendParameter.AngleRad);
}
axes[0].Transform(transformation);
axes[1].Transform(transformation);
// Create no bend section, if kfac==0
if (kfac > 0.0)
{
// Reconstruct faces
var pnts = new Pnt[4]; // Corner points of one section
pnts[0] = axes[0].Location.Translated(axes[0].XDirection.ToVec() * section.BendParameter.Radii[0]);
pnts[1] = axes[1].Location.Translated(axes[1].XDirection.ToVec() * section.BendParameter.Radii[0]);
pnts[2] = axes[0].Location.Translated(axes[0].XDirection.ToVec() * section.BendParameter.Radii[1]);
pnts[3] = axes[1].Location.Translated(axes[1].XDirection.ToVec() * section.BendParameter.Radii[1]);
var extrudeVec = axes[0].YDirection.ToVec() * swapSign * bendAllowance; // Vector to extrude to the other section
// Top/Bottom
context.Sewer.Add(TopoUtils.MakeFace(new[] { pnts[0], pnts[0].Translated(extrudeVec), pnts[1].Translated(extrudeVec), pnts[1] }));
context.Sewer.Add(TopoUtils.MakeFace(new[] { pnts[2], pnts[2].Translated(extrudeVec), pnts[3].Translated(extrudeVec), pnts[3] }));
// Sides
context.Sewer.Add(TopoUtils.MakeFace(new[] { pnts[0], pnts[0].Translated(extrudeVec), pnts[2].Translated(extrudeVec), pnts[2] }));
context.Sewer.Add(TopoUtils.MakeFace(new[] { pnts[1], pnts[1].Translated(extrudeVec), pnts[3].Translated(extrudeVec), pnts[3] }));
}
// Create transform for connected sections
var rotTrsf = new Trsf(axes[0].Axis, swapSign * -section.BendParameter.AngleRad);
transformation.PreMultiply(rotTrsf);
var dispTrsf = new Trsf(axes[0].YDirection.ToVec() * swapSign * bendAllowance);
transformation.PreMultiply(dispTrsf);
//section.Faces.ForEach(f => context.Sewer.Add(f));
}
else
{
// Copy all faces to the result
foreach (var face in section.Faces)
{
var transformedFace = face.Moved(new TopLoc_Location(transformation));
context.Sewer.Add(transformedFace);
//context.Sewer.Add(face);
}
}
// Process children
foreach (var child in section.Children)
{
_AddSectionToResult(context, child, transformation);
}
return(true);
}
//--------------------------------------------------------------------------------------------------
bool _MakeFlangeFace(MakeContext context)
{
if (_StartGap <= 0 && _EndGap <= 0)
{
context.FlangeFace = context.TargetFace;
return(true);
}
// Get points from bend edge and opposite edge
var points = new Pnt[4];
var bendEdgeAdaptor = new BRepAdaptor_Curve(context.BendEdge);
points[0] = bendEdgeAdaptor.Value(bendEdgeAdaptor.FirstParameter());
points[1] = bendEdgeAdaptor.Value(bendEdgeAdaptor.LastParameter());
if (points[0].Distance(points[1]) <= (_StartGap + _EndGap))
{
Messages.Error("The sum of start and end gap is higher than the length of the bending edge.");
return(false);
}
if (context.OppositeEdge == null)
{
Messages.Error("No opposite edge found for building flange face.");
return(false);
}
// Move vertices from bend edge to op edge
var distTool = new BRepExtrema_DistShapeShape(context.BendEdge, context.OppositeEdge);
var upVector = context.TopDirection.ToVec().Reversed() * distTool.Value();
points[2] = points[0].Translated(upVector);
points[3] = points[1].Translated(upVector);
// Sort points, Short edges must be 1->2 and 3->0
if (context.BendEdge.Orientation() == TopAbs_Orientation.TopAbs_REVERSED)
{
points.Swap(0, 1);
}
if (points[0].Distance(points[3]) > points[0].Distance(points[2]))
{
points.Swap(2, 3);
}
// Move
if (_StartGap > 0)
{
var startVector = context.BendAxis.Direction.ToVec().Multiplied(_StartGap);
points[0].Translate(startVector);
points[3].Translate(startVector);
}
if (_EndGap > 0)
{
var endVector = context.BendAxis.Direction.ToVec().Multiplied(-_EndGap);
points[1].Translate(endVector);
points[2].Translate(endVector);
}
// Generate face and new edges
context.FlangeFace = TopoUtils.MakeFace(points);
if (context.FlangeFace == null)
{
Messages.Error("Failed making flange face with gaps.");
return(false);
}
context.BendEdge = new BRepBuilderAPI_MakeEdge(points[0], points[1]).Edge();
context.OppositeEdge = new BRepBuilderAPI_MakeEdge(points[3], points[2]).Edge();
// Split original face to avoid problems with additional flanges on the same face
TopoDS_Edge startGapEdge = null, endGapEdge = null;
var splitOp = new BRepFeat_SplitShape(context.TargetShape);
if (_StartGap > 0)
{
startGapEdge = new BRepBuilderAPI_MakeEdge(points[0], points[3]).Edge();
splitOp.Add(startGapEdge, context.TargetFace);
}
if (_EndGap > 0)
{
endGapEdge = new BRepBuilderAPI_MakeEdge(points[1], points[2]).Edge();
splitOp.Add(endGapEdge, context.TargetFace);
}
splitOp.Build();
if (!splitOp.IsDone())
{
Messages.Error("Failed spliting gap edges into target face.");
return(false);
}
UpdateModifiedSubshapes(context.TargetShape, splitOp);
context.ModifiedTargetShape = splitOp.Shape();
// Update named shapes
var splitFaceList = splitOp.Modified(context.TargetFace).ToList();
foreach (var splitShape in splitFaceList)
{
var edges = splitShape.Edges();
foreach (var edge in edges)
{
if (startGapEdge != null && context.StartGapFace == null &&
edge.Orientation() == splitShape.Orientation() &&
edge.IsSame(startGapEdge))
{
context.StartGapFace = splitShape;
break;
}
if (endGapEdge != null && context.EndGapFace == null &&
edge.Orientation() != splitShape.Orientation() &&
edge.IsSame(endGapEdge))
{
context.EndGapFace = splitShape;
break;
}
}
}
return(true);
}
