internal void AddToGraph(TransientGraphUtility transUtil, bool routeToCenter)
{
// We use only border vertices if !routeToCenter.
if (routeToCenter)
{
CenterVertex = transUtil.FindOrAddVertex(this.Location);
}
}
internal void ExtendEdgeChain(TransientGraphUtility transUtil, VisibilityVertex paddedBorderVertex
, VisibilityVertex targetVertex, Rectangle limitRect, bool routeToCenter)
{
// Extend the edge chain to the opposite side of the limit rectangle.
transUtil.ExtendEdgeChain(targetVertex, limitRect, this.MaxVisibilitySegment, this.pointAndCrossingsList, this.IsOverlapped);
// In order for Nudger to be able to map from the (near-) endpoint vertex to a PortEntry, we must
// always connect a vertex at UnpaddedBorderIntersect to the paddedBorderVertex, even if routeToCenter.
var unpaddedBorderVertex = transUtil.FindOrAddVertex(UnpaddedBorderIntersect);
transUtil.FindOrAddEdge(unpaddedBorderVertex, paddedBorderVertex, this.unpaddedToPaddedBorderWeight);
if (routeToCenter)
{
// Link the CenterVertex to the vertex at UnpaddedBorderIntersect.
transUtil.ConnectVertexToTargetVertex(ObstaclePort.CenterVertex, unpaddedBorderVertex, OutwardDirection, InitialWeight);
}
}
internal void AddToAdjacentVertex(TransientGraphUtility transUtil, VisibilityVertex targetVertex
, Rectangle limitRect, bool routeToCenter)
{
VisibilityVertex borderVertex = transUtil.VisGraph.FindVertex(this.VisibilityBorderIntersect);
if (null != borderVertex)
{
ExtendFromBorderVertex(transUtil, borderVertex, limitRect, routeToCenter);
return;
}
// There is no vertex at VisibilityBorderIntersect, so create it and link it to targetVertex.
// Note: VisibilityBorderIntersect may == targetIntersect if that is on our border, *and*
// targetIntersect may be on the border of a touching obstacle, in which case this will splice
// into or across the adjacent obstacle, which is consistent with "touching is overlapped".
// So we don't use UnpaddedBorderIntersect as prevPoint when calling ExtendEdgeChain.
// VisibilityBorderIntersect may be rounded just one Curve.DistanceEpsilon beyond the ScanSegment's
// perpendicular coordinate; e.g. our X may be targetIntersect.X + Curve.DistanceEpsilon, thereby
// causing the direction from VisibilityBorderIntersect to targetIntersect to be W instead of E.
// So use the targetIntersect if they are close enough; they will be equal for flat borders, and
// otherwise the exact value we use only needs be "close enough" to the border. (We can't use
// CenterVertex as the prevPoint because that could be an impure direction).
// Update: With the change to carry MaxVisibilitySegment within the PortEntrance, PortManager finds
// targetVertex between VisibilityBorderIntersect and MaxVisibilitySegment.End, so this should no longer
// be able to happen.
// See RectilinearTests.PaddedBorderIntersectMeetsIncomingScanSegment for an example of what happens
// when VisibilityBorderIntersect is on the incoming ScanSegment (it jumps out above with borderVertex found).
if (OutwardDirection == PointComparer.GetPureDirection(targetVertex.Point, this.VisibilityBorderIntersect))
{
Debug.Assert(false, "Unexpected reversed direction between VisibilityBorderIntersect and targetVertex");
// ReSharper disable HeuristicUnreachableCode
this.VisibilityBorderIntersect = targetVertex.Point;
borderVertex = targetVertex;
// ReSharper restore HeuristicUnreachableCode
}
else
{
borderVertex = transUtil.FindOrAddVertex(this.VisibilityBorderIntersect);
transUtil.FindOrAddEdge(borderVertex, targetVertex, InitialWeight);
}
ExtendEdgeChain(transUtil, borderVertex, targetVertex, limitRect, routeToCenter);
}
internal void GetVertex(TransientGraphUtility transUtil, Point point) {
this.Vertex = transUtil.FindOrAddVertex(point);
}
internal void GetVertex(TransientGraphUtility transUtil, Point point)
{
this.Vertex = transUtil.FindOrAddVertex(point);
}
internal void ExtendEdgeChain(TransientGraphUtility transUtil, VisibilityVertex paddedBorderVertex
, VisibilityVertex targetVertex, Rectangle limitRect, bool routeToCenter) {
// Extend the edge chain to the opposite side of the limit rectangle.
transUtil.ExtendEdgeChain(targetVertex, limitRect, this.MaxVisibilitySegment, this.pointAndCrossingsList, this.IsOverlapped);
// In order for Nudger to be able to map from the (near-) endpoint vertex to a PortEntry, we must
// always connect a vertex at UnpaddedBorderIntersect to the paddedBorderVertex, even if routeToCenter.
var unpaddedBorderVertex = transUtil.FindOrAddVertex(UnpaddedBorderIntersect);
transUtil.FindOrAddEdge(unpaddedBorderVertex, paddedBorderVertex, this.unpaddedToPaddedBorderWeight);
if (routeToCenter) {
// Link the CenterVertex to the vertex at UnpaddedBorderIntersect.
transUtil.ConnectVertexToTargetVertex(ObstaclePort.CenterVertex, unpaddedBorderVertex, OutwardDirection, InitialWeight);
}
}
internal void AddToAdjacentVertex(TransientGraphUtility transUtil, VisibilityVertex targetVertex
, Rectangle limitRect, bool routeToCenter) {
VisibilityVertex borderVertex = transUtil.VisGraph.FindVertex(this.VisibilityBorderIntersect);
if (null != borderVertex) {
ExtendFromBorderVertex(transUtil, borderVertex, limitRect, routeToCenter);
return;
}
// There is no vertex at VisibilityBorderIntersect, so create it and link it to targetVertex.
// Note: VisibilityBorderIntersect may == targetIntersect if that is on our border, *and*
// targetIntersect may be on the border of a touching obstacle, in which case this will splice
// into or across the adjacent obstacle, which is consistent with "touching is overlapped".
// So we don't use UnpaddedBorderIntersect as prevPoint when calling ExtendEdgeChain.
// VisibilityBorderIntersect may be rounded just one Curve.DistanceEpsilon beyond the ScanSegment's
// perpendicular coordinate; e.g. our X may be targetIntersect.X + Curve.DistanceEpsilon, thereby
// causing the direction from VisibilityBorderIntersect to targetIntersect to be W instead of E.
// So use the targetIntersect if they are close enough; they will be equal for flat borders, and
// otherwise the exact value we use only needs be "close enough" to the border. (We can't use
// CenterVertex as the prevPoint because that could be an impure direction).
// Update: With the change to carry MaxVisibilitySegment within the PortEntrance, PortManager finds
// targetVertex between VisibilityBorderIntersect and MaxVisibilitySegment.End, so this should no longer
// be able to happen.
// See RectilinearTests.PaddedBorderIntersectMeetsIncomingScanSegment for an example of what happens
// when VisibilityBorderIntersect is on the incoming ScanSegment (it jumps out above with borderVertex found).
if (OutwardDirection == PointComparer.GetPureDirection(targetVertex.Point, this.VisibilityBorderIntersect)) {
Debug.Assert(false, "Unexpected reversed direction between VisibilityBorderIntersect and targetVertex");
// ReSharper disable HeuristicUnreachableCode
this.VisibilityBorderIntersect = targetVertex.Point;
borderVertex = targetVertex;
// ReSharper restore HeuristicUnreachableCode
}
else {
borderVertex = transUtil.FindOrAddVertex(this.VisibilityBorderIntersect);
transUtil.FindOrAddEdge(borderVertex, targetVertex, InitialWeight);
}
ExtendEdgeChain(transUtil, borderVertex, targetVertex, limitRect, routeToCenter);
}
internal void AddToGraph(TransientGraphUtility transUtil, bool routeToCenter) {
// We use only border vertices if !routeToCenter.
if (routeToCenter) {
CenterVertex = transUtil.FindOrAddVertex(this.Location);
}
}
