private static void FlipScanEdgeEvent(DTSweepContext tcx, TriangulationPoint ep, TriangulationPoint eq, DelaunayTriangle flipTriangle, DelaunayTriangle t, TriangulationPoint p) { DelaunayTriangle ot; TriangulationPoint op, newP; bool inScanArea; ot = t.NeighborAcrossFrom(p); op = ot.OppositePoint(t, p); if (ot == null) { throw new Exception("FLIP failed due to missing triangle"); } if (tcx.IsDebugEnabled) { Console.WriteLine("scan next point"); tcx.DTDebugContext.PrimaryTriangle = t; tcx.DTDebugContext.SecondaryTriangle = ot; } inScanArea = TriangulationUtil.InScanArea(eq, flipTriangle.PointCCWFrom(eq), flipTriangle.PointCWFrom(eq), op); if (inScanArea) { FlipEdgeEvent(tcx, eq, op, ot, op); } else { if (NextFlipPoint(ep, eq, ot, op, out newP)) { FlipScanEdgeEvent(tcx, ep, eq, flipTriangle, ot, newP); } } }
private static void FlipEdgeEvent(DTSweepContext tcx, TriangulationPoint ep, TriangulationPoint eq, DelaunayTriangle t, TriangulationPoint p) { DelaunayTriangle ot = t.NeighborAcrossFrom(p); TriangulationPoint op = ot.OppositePoint(t, p); if (ot == null) { throw new InvalidOperationException("[BUG:FIXME] FLIP failed due to missing triangle"); } if (tcx.IsDebugEnabled) { tcx.DTDebugContext.PrimaryTriangle = t; tcx.DTDebugContext.SecondaryTriangle = ot; } bool inScanArea = TriangulationUtil.InScanArea(p, t.PointCCWFrom(p), t.PointCWFrom(p), op); if (inScanArea) { RotateTrianglePair(t, p, ot, op); tcx.MapTriangleToNodes(t); tcx.MapTriangleToNodes(ot); if (p == eq && op == ep) { if (eq == tcx.EdgeEvent.ConstrainedEdge.Q && ep == tcx.EdgeEvent.ConstrainedEdge.P) { if (tcx.IsDebugEnabled) { Console.WriteLine("[FLIP] - constrained edge done"); } t.MarkConstrainedEdge(ep, eq); ot.MarkConstrainedEdge(ep, eq); Legalize(tcx, t); Legalize(tcx, ot); } else { if (tcx.IsDebugEnabled) { Console.WriteLine("[FLIP] - subedge done"); } } } else { Orientation o = TriangulationUtil.Orient2d(eq, op, ep); t = NextFlipTriangle(tcx, o, t, ot, p, op); FlipEdgeEvent(tcx, ep, eq, t, p); } } else { TriangulationPoint newP = null; if (NextFlipPoint(ep, eq, ot, op, out newP)) { FlipScanEdgeEvent(tcx, ep, eq, t, ot, newP); EdgeEvent(tcx, ep, eq, t, p); } } }