private static List<EdgeAggregator> InstantiateIntersection(Parallel parallel, Intersection inter1, Intersection inter2)
{
List<EdgeAggregator> newGrounded = new List<EdgeAggregator>();
// Avoid:
// | |
// __| ________|
// | |
// | |
// Both intersections (transversal segments) must contain the actual transversal; that is, a direct, segment relationship must exist
if (!inter1.CreatesAValidTransversalWith(inter2)) return newGrounded;
// No corresponding angles if we have:
//
// | | |
// |__________| |_________
// |
// |
//
if (inter1.StandsOnEndpoint() && inter2.StandsOnEndpoint()) return newGrounded;
// if (Utilities.DEBUG) System.Diagnostics.Debug.WriteLine("Working on: \n\t" + inter1.ToString() + "\n\t" + inter2.ToString());
//
// Verify we have a parallel / intersection situation using the given information
//
Segment transversal = inter1.AcquireTransversal(inter2);
// Ensure the non-traversal segments align with the parallel segments
Segment coincidingParallel1 = parallel.CoincidesWith(inter1.OtherSegment(transversal));
Segment coincidingParallel2 = parallel.CoincidesWith(inter2.OtherSegment(transversal));
// The pair of non-transversals needs to align exactly with the parallel pair of segments
if (coincidingParallel1 == null || coincidingParallel2 == null) return newGrounded;
// STANDARD Dual Crossings
// Corresponding angles:
//
// | |
// ___|__________|__
// | |
// | |
//
if (inter1.Crossing() && inter2.Crossing()) return InstantiateCompleteIntersection(parallel, inter1, inter2);
// NOT Corresponding if an H-Shape
//
// | |
// |_____|
// | |
// | |
//
if (inter1.CreatesHShape(inter2)) return newGrounded;
// NOT Corresponding angles if:
//
// |______
// |
// ______|
// |
//
KeyValuePair<Point, Point> sShapePoints = inter1.CreatesStandardSShape(inter2);
if (sShapePoints.Key != null && sShapePoints.Value != null) return newGrounded;
// NOT Corresponding angles if:
//
// |______
// |
// ______|
KeyValuePair<Point, Point> leanerShapePoints = inter1.CreatesLeanerShape(inter2);
if (leanerShapePoints.Key != null && leanerShapePoints.Value != null) return newGrounded;
// Corresponding angles if:
// _____
// |
// |_____
// |
// |
//
KeyValuePair<Point, Point> fShapePoints = inter1.CreatesFShape(inter2);
if (fShapePoints.Key != null && fShapePoints.Value != null)
{
return InstantiateFIntersection(parallel, inter1, fShapePoints.Key, inter2, fShapePoints.Value);
}
sShapePoints = inter1.CreatesSimpleSShape(inter2);
if (sShapePoints.Key != null && sShapePoints.Value != null) return newGrounded;
// Corresponding angles if:
// o e
// standsOn (o) o e standsOnEndpoint (e)
// eeeoeeeeeeee
// o
// o
//
KeyValuePair<Point, Point> simpleTShapePoints = inter1.CreatesSimpleTShape(inter2);
if (simpleTShapePoints.Key != null && simpleTShapePoints.Value != null)
{
return InstantiateSimpleTIntersection(parallel, inter1, inter2, simpleTShapePoints.Key, simpleTShapePoints.Value);
}
// Corresponding angles if:
// ____________
// | |
// | |
//
KeyValuePair<Point, Point> piShapePoints = inter1.CreatesSimplePIShape(inter2);
if (piShapePoints.Key != null && piShapePoints.Value != null)
{
return InstantiateSimplePiIntersection(parallel, inter1, inter2, piShapePoints.Key, piShapePoints.Value);
}
// Corresponding if:
//
// | | |
// |_____|____ |_________
// | | |
// | | |
//
KeyValuePair<Point, Point> chairShapePoints = inter1.CreatesChairShape(inter2);
if (chairShapePoints.Key != null && chairShapePoints.Value != null)
{
return InstantiateChairIntersection(parallel, inter1, chairShapePoints.Key, inter2, chairShapePoints.Value);
}
// Corresponding angles if:
// ____________
// | |
// | |
//
piShapePoints = inter1.CreatesPIShape(inter2);
if (piShapePoints.Key != null && piShapePoints.Value != null)
{
return InstantiatePiIntersection(parallel, inter1, piShapePoints.Key, inter2, piShapePoints.Value);
}
//
// | |
// _____|____ ______|______
// | |
// |_____ _____|
//
KeyValuePair<Point, Point> crossedTShapePoints = inter1.CreatesCrossedTShape(inter2);
if (crossedTShapePoints.Key != null && crossedTShapePoints.Value != null)
{
return InstantiateCrossedTIntersection(parallel, inter1, inter2, crossedTShapePoints.Key, crossedTShapePoints.Value);
}
// Corresponding if a flying-Shape
//
// | |
// |_____|___
// | |
// | |
//
KeyValuePair<Intersection, Point> flyingShapeValues = inter1.CreatesFlyingShape(inter2);
if (flyingShapeValues.Key != null && flyingShapeValues.Value != null)
{
return InstantiateFlyingIntersection(parallel, inter1, inter2, flyingShapeValues.Key, flyingShapeValues.Value);
}
// |
// ______|______
// |
// _____|_____
Point offCross = inter1.CreatesFlyingShapeWithCrossing(inter2);
if (offCross != null) return InstantiateFlyingCrossedIntersection(parallel, inter1, inter2, offCross);
// |
// ______|______
// |
// |_____
// |
offCross = inter1.CreatesExtendedChairShape(inter2);
if (offCross != null) return InstantiateExtendedChairIntersection(parallel, inter1, inter2, offCross);
return newGrounded;
}
private static List<EdgeAggregator> CheckAndGenerateParallelImplySameSide(Intersection inter1, Intersection inter2, Parallel parallel)
{
List<EdgeAggregator> newGrounded = new List<EdgeAggregator>();
// The two intersections should not be at the same vertex
if (inter1.intersect.Equals(inter2.intersect)) return newGrounded;
// Determine the transversal
Segment transversal = inter1.AcquireTransversal(inter2);
if (transversal == null) return newGrounded;
//
// Ensure the non-traversal segments align with the parallel segments
//
Segment parallel1 = inter1.OtherSegment(transversal);
Segment parallel2 = inter2.OtherSegment(transversal);
// The non-transversals should not be the same (coinciding)
if (parallel1.IsCollinearWith(parallel2)) return newGrounded;
Segment coincidingParallel1 = parallel.CoincidesWith(parallel1);
Segment coincidingParallel2 = parallel.CoincidesWith(parallel2);
// The pair of non-transversals needs to align exactly with the parallel pair of segments
if (coincidingParallel1 == null || coincidingParallel2 == null) return newGrounded;
// Both intersections should not be referring to an intersection point on the same parallel segment
if (parallel.segment1.PointLiesOn(inter1.intersect) && parallel.segment1.PointLiesOn(inter2.intersect)) return newGrounded;
if (parallel.segment2.PointLiesOn(inter1.intersect) && parallel.segment2.PointLiesOn(inter2.intersect)) return newGrounded;
// The resultant candidate parallel segments shouldn't share any vertices
if (coincidingParallel1.SharedVertex(coincidingParallel2) != null) return newGrounded;
if (inter1.StandsOnEndpoint() && inter2.StandsOnEndpoint())
{
//
// Creates a basic S-Shape with standsOnEndpoints
//
// ______ offThat
// |
// offThis ______|
//
// Return <offThis, offThat>
KeyValuePair<Point, Point> sShapePoints = inter1.CreatesBasicSShape(inter2);
if (sShapePoints.Key != null && sShapePoints.Value != null) return newGrounded;
//
// Creates a basic C-Shape with standsOnEndpoints
//
// offThis ______
// |
// offThat ______|
//
// Return <offThis, offThat>
KeyValuePair<Point, Point> cShapePoints = inter1.CreatesBasicCShape(inter2);
if (cShapePoints.Key != null && cShapePoints.Value != null)
{
return GenerateSimpleC(parallel, inter1, cShapePoints.Key, inter2, cShapePoints.Value);
}
return newGrounded;
}
// _______/________
// /
// /
// ______/_______
// /
if (inter1.Crossing() && inter2.Crossing()) return GenerateDualCrossings(parallel, inter1, inter2);
// Alt. Int if an H-Shape
//
// | |
// |_____|
// | |
// | |
//
if (inter1.CreatesHShape(inter2)) return GenerateH(parallel, inter1, inter2);
// Corresponding if a flying-Shape
//
// | |
// |_____|___ offCross
// | |
// | |
//
Point offCross = inter1.CreatesFlyingShapeWithCrossing(inter2);
if (offCross != null)
{
return GenerateFlying(parallel, inter1, inter2, offCross);
}
//
// Creates a shape like an extended t
// offCross offCross
// | |
// _____|____ ______|______
// | |
// |_____ offStands offStands _____|
//
// Returns <offStands, offCross>
KeyValuePair<Point, Point> tShapePoints = inter1.CreatesCrossedTShape(inter2);
if (tShapePoints.Key != null && tShapePoints.Value != null)
{
return GenerateCrossedT(parallel, inter1, inter2, tShapePoints.Key, tShapePoints.Value);
}
//
// Creates a Topped F-Shape
// top
// offLeft __________ offEnd <--- Stands on
// |
// |_____ off <--- Stands on
// |
// |
// bottom
//
// Returns: <bottom, off>
KeyValuePair<Intersection, Point> toppedFShapePoints = inter1.CreatesToppedFShape(inter2);
if (toppedFShapePoints.Key != null && toppedFShapePoints.Value != null)
{
return GenerateToppedFShape(parallel, inter1, inter2, toppedFShapePoints.Key, toppedFShapePoints.Value);
}
// Corresponding angles if:
// ____________
// | |
// | |
//
KeyValuePair<Point, Point> piShapePoints = inter1.CreatesPIShape(inter2);
if (piShapePoints.Key != null && piShapePoints.Value != null)
{
return InstantiatePiIntersection(parallel, inter1, piShapePoints.Key, inter2, piShapePoints.Value);
}
// Corresponding angles if:
// _____
// |
// |_____
// |
// |
//
KeyValuePair<Point, Point> fShapePoints = inter1.CreatesFShape(inter2);
if (fShapePoints.Key != null && fShapePoints.Value != null)
{
return InstantiateFIntersection(parallel, inter1, fShapePoints.Key, inter2, fShapePoints.Value);
}
return newGrounded;
}