//
// Creates an H-Shape
//
// | |
// |_____|
// | |
// | |
//
public bool CreatesHShape(Intersection thatInter)
{
// A valid transversal is required for this shape
if (!this.CreatesAValidTransversalWith(thatInter))
{
return(false);
}
// Both intersections must be standing on (and not endpoints)
if (!this.StandsOn() || !thatInter.StandsOn())
{
return(false);
}
if (this.StandsOnEndpoint() || this.StandsOnEndpoint())
{
return(false);
}
Point thisTipOfT = this.CreatesTShape();
Point thatTipOfT = thatInter.CreatesTShape();
Segment transversal = this.AcquireTransversal(thatInter);
// The tips of the intersections must be within the transversal (at the endpoint) for an H
if (!transversal.PointLiesOnAndBetweenEndpoints(thisTipOfT))
{
return(false);
}
if (!transversal.PointLiesOnAndBetweenEndpoints(thatTipOfT))
{
return(false);
}
return(true);
}
//
// Creates a Leaner-Shape (a bench you can sit on)
//
// top
// |______ tipStands
// |
// tipEndpt ______|
//
// Returns <tipEndpoint, tipStands>
public KeyValuePair <Point, Point> CreatesLeanerShape(Intersection thatInter)
{
KeyValuePair <Point, Point> nullPair = new KeyValuePair <Point, Point>(null, null);
// A valid transversal is required for this shape
if (!this.CreatesAValidTransversalWith(thatInter))
{
return(nullPair);
}
if (this.StandsOnEndpoint() && thatInter.StandsOnEndpoint())
{
return(nullPair);
}
//
// Determine which is the stands and which is the endpoint
//
Intersection endpointInter = null;
Intersection standsInter = null;
if (this.StandsOnEndpoint() && thatInter.StandsOn())
{
endpointInter = this;
standsInter = thatInter;
}
else if (thatInter.StandsOnEndpoint() && this.StandsOn())
{
endpointInter = thatInter;
standsInter = this;
}
else
{
return(nullPair);
}
//
// Acquire Points
//
Point tipStands = standsInter.CreatesTShape();
Segment transversal = this.AcquireTransversal(thatInter);
Segment parallelEndpoint = endpointInter.OtherSegment(transversal);
Point tipEndpoint = parallelEndpoint.OtherPoint(endpointInter.intersect);
// Determine sides
Segment crossingTester = new Segment(tipEndpoint, tipStands);
Point intersection = transversal.FindIntersection(crossingTester);
// F-Shape
if (!transversal.PointLiesOnAndBetweenEndpoints(intersection))
{
return(nullPair);
}
// Desired Leaner shape
return(new KeyValuePair <Point, Point>(tipEndpoint, tipStands));
}
// Corresponding angles if:
// offRightEnd
// standsOn (o) o e
// o e standsOnEndpoint (e)
// offLeftEnd eeeoeeeeeeee
// o
// o
//
// Returns <offLeftEnd, offRightEnd>
//
public KeyValuePair <Point, Point> CreatesSimpleTShape(Intersection thatInter)
{
KeyValuePair <Point, Point> nullPair = new KeyValuePair <Point, Point>(null, null);
// A valid transversal is required for this shape
if (!this.CreatesAValidTransversalWith(thatInter))
{
return(nullPair);
}
if (this.StandsOnEndpoint() && thatInter.StandsOnEndpoint())
{
return(nullPair);
}
//
// Determine which is the crossing intersection and which stands on the endpoints
//
Intersection endpointInter = null;
Intersection standsInter = null;
if (this.StandsOnEndpoint() && thatInter.StandsOn())
{
endpointInter = this;
standsInter = thatInter;
}
else if (thatInter.Crossing() && this.StandsOnEndpoint())
{
endpointInter = thatInter;
standsInter = this;
}
else
{
return(nullPair);
}
//
// Determine if the endpoint intersection extends beyond the stands parallel line
//
Segment transversal = this.AcquireTransversal(thatInter);
Segment transversalEndpoint = endpointInter.GetCollinearSegment(transversal);
if (transversal.PointLiesOnAndBetweenEndpoints(transversalEndpoint.Point1) &&
transversal.PointLiesOnAndBetweenEndpoints(transversalEndpoint.Point2))
{
return(nullPair);
}
//
// Acquire the returning points
//
Segment parallelEndpoint = endpointInter.OtherSegment(transversal);
Point offLeftEnd = transversalEndpoint.OtherPoint(endpointInter.intersect);
Point offRightEnd = parallelEndpoint.OtherPoint(endpointInter.intersect);
return(new KeyValuePair <Point, Point>(offLeftEnd, offRightEnd));
}
//
// Creates a flying shape using a CROSSING intersection
// offCross
// |
// ______|______ <--crossingInter
// |
// _____|_____ <--standsInter
//
// Returns <offCross>
//
public Point CreatesFlyingShapeWithCrossing(Intersection thatInter)
{
// A valid transversal is required for this shape
if (!this.CreatesAValidTransversalWith(thatInter))
{
return(null);
}
// We hould not have have endpoint standing as that is handled elsewhere
if (this.StandsOnEndpoint() || thatInter.StandsOnEndpoint())
{
return(null);
}
//
// Determine which is the crossing intersection and which stands on the endpoints
//
Intersection crossingInter = null;
Intersection standsInter = null;
if (this.Crossing() && thatInter.StandsOn())
{
crossingInter = this;
standsInter = thatInter;
}
else if (thatInter.Crossing() && this.StandsOn())
{
crossingInter = thatInter;
standsInter = this;
}
else
{
return(null);
}
Segment transversal = this.AcquireTransversal(thatInter);
// Stands on intersection must have BOTH points not on the transversal line
// |
// ______|______
// |
// |_____
// |
// |
if (!transversal.PointLiesOn(standsInter.CreatesTShape()))
{
return(null);
}
// Success, we have the desired shape
// Acquire return point: offCross
Segment transversalCrossing = crossingInter.GetCollinearSegment(transversal);
return(Segment.Between(crossingInter.intersect, transversalCrossing.Point1, standsInter.intersect) ?
transversalCrossing.Point1 : transversalCrossing.Point2);
}
//
// o
// eoooooooo offStands
// e
//offEndpoint eeeeeee
// o
// Returns: <offEndpoint, offStands>
public KeyValuePair <Point, Point> CreatesSimpleSShape(Intersection thatInter)
{
KeyValuePair <Point, Point> nullPair = new KeyValuePair <Point, Point>(null, null);
// A valid transversal is required for this shape
if (!this.CreatesAValidTransversalWith(thatInter))
{
return(nullPair);
}
// Restrict to desired combination
if (this.StandsOnEndpoint() && thatInter.StandsOnEndpoint())
{
return(nullPair);
}
//
// Determine which is the stands and which is the endpoint
//
Intersection endpointInter = null;
Intersection standsInter = null;
if (this.StandsOnEndpoint() && thatInter.StandsOn())
{
endpointInter = this;
standsInter = thatInter;
}
else if (thatInter.StandsOnEndpoint() && this.StandsOn())
{
endpointInter = this;
standsInter = thatInter;
}
else
{
return(nullPair);
}
// Determine S shape
Point offStands = standsInter.CreatesTShape();
Segment transversal = this.AcquireTransversal(thatInter);
Segment parallelEndpoint = endpointInter.OtherSegment(transversal);
Point offEndpoint = parallelEndpoint.OtherPoint(endpointInter.intersect);
Segment crossingTester = new Segment(offStands, offEndpoint);
Point intersection = transversal.FindIntersection(crossingTester);
return(transversal.PointLiesOnAndBetweenEndpoints(intersection) ? new KeyValuePair <Point, Point>(offEndpoint, offStands) : nullPair);
}
//
// Creates a shape like a crazy person flying
//
// | |
// |_____|___ off
// | |
// | |
//
// Similar to H-shape with an extended point
// Returns the 'larger' intersection that contains the point: off
public KeyValuePair <Intersection, Point> CreatesFlyingShape(Intersection thatInter)
{
KeyValuePair <Intersection, Point> nullPair = new KeyValuePair <Intersection, Point>(null, null);
// A valid transversal is required for this shape
if (!this.CreatesAValidTransversalWith(thatInter))
{
return(nullPair);
}
// Both intersections must be standing on (and not endpoints)
if (!this.StandsOn() || !thatInter.StandsOn())
{
return(nullPair);
}
if (this.StandsOnEndpoint() || thatInter.StandsOnEndpoint())
{
return(nullPair);
}
Point thisTipOfT = this.CreatesTShape();
Point thatTipOfT = thatInter.CreatesTShape();
Segment transversal = this.AcquireTransversal(thatInter);
// We have an H-Shape if the tips of the intersections are at the endpoints of the transversal
if (transversal.PointLiesOnAndBetweenEndpoints(thisTipOfT) && transversal.PointLiesOnAndBetweenEndpoints(thatTipOfT))
{
return(nullPair);
}
Intersection retInter = null;
Point off = null;
if (transversal.PointLiesOnAndBetweenEndpoints(thisTipOfT))
{
retInter = thatInter;
off = thatTipOfT;
}
else
{
retInter = this;
off = thisTipOfT;
}
return(new KeyValuePair <Intersection, Point>(retInter, off));
}
//
// Creates an F-Shape
// top
// _____ offEnd <--- Stands on Endpt
// |
// |_____ offStands <--- Stands on
// |
// |
// bottom
// Order of non-collinear points is order of intersections: <this, that>
public KeyValuePair<Point, Point> CreatesFShape(Intersection thatInter)
{
KeyValuePair<Point, Point> nullPair = new KeyValuePair<Point, Point>(null, null);
// A valid transversal is required for this shape
if (!this.CreatesAValidTransversalWith(thatInter)) return nullPair;
// Avoid both standing on an endpoint
if (this.StandsOnEndpoint() && thatInter.StandsOnEndpoint()) return nullPair;
Intersection endpt = null;
Intersection standsOn = null;
if (this.StandsOnEndpoint() && thatInter.StandsOn())
{
endpt = this;
standsOn = thatInter;
}
else if (thatInter.StandsOnEndpoint() && this.StandsOn())
{
endpt = thatInter;
standsOn = this;
}
else return nullPair;
Segment transversal = this.AcquireTransversal(thatInter);
Segment transversalStands = standsOn.GetCollinearSegment(transversal);
//
// Determine Top and bottom to avoid PI shape
//
Point top = null;
Point bottom = null;
if (Segment.Between(standsOn.intersect, transversalStands.Point1, endpt.intersect))
{
bottom = transversalStands.Point1;
top = transversalStands.Point2;
}
else
{
bottom = transversalStands.Point2;
top = transversalStands.Point1;
}
// Avoid: ____ Although this shouldn't happen since both intersections do not stand on endpoints
// ____|
if (transversal.HasPoint(top) && transversal.HasPoint(bottom)) return nullPair;
// Also avoid Simple PI-Shape
//
if (!transversal.HasPoint(top) && !transversal.HasPoint(bottom)) return nullPair;
// Find the two points that make the points of the F
Segment parallelEndPt = endpt.OtherSegment(transversal);
Segment parallelStands = standsOn.OtherSegment(transversal);
Point offEnd = transversal.PointLiesOn(parallelEndPt.Point1) ? parallelEndPt.Point2 : parallelEndPt.Point1;
Point offStands = transversal.PointLiesOn(parallelStands.Point1) ? parallelStands.Point2 : parallelStands.Point1;
// Check this is not a crazy F
// _____
// |
// ____|
// |
// |
Point intersection = transversal.FindIntersection(new Segment(offEnd, offStands));
if (transversal.PointLiesOnAndBetweenEndpoints(intersection)) return nullPair;
// Return in the order of 'off' points: <this, that>
return this.Equals(endpt) ? new KeyValuePair<Point, Point>(offEnd, offStands) : new KeyValuePair<Point, Point>(offStands, offEnd);
}
//
// Creates a flying shape using a CROSSING intersection
// offCross
// |
// ______|______ <--crossingInter
// |
// _____|_____ <--standsInter
//
// Returns <offCross>
//
public Point CreatesFlyingShapeWithCrossing(Intersection thatInter)
{
// A valid transversal is required for this shape
if (!this.CreatesAValidTransversalWith(thatInter)) return null;
// We hould not have have endpoint standing as that is handled elsewhere
if (this.StandsOnEndpoint() || thatInter.StandsOnEndpoint()) return null;
//
// Determine which is the crossing intersection and which stands on the endpoints
//
Intersection crossingInter = null;
Intersection standsInter = null;
if (this.Crossing() && thatInter.StandsOn())
{
crossingInter = this;
standsInter = thatInter;
}
else if (thatInter.Crossing() && this.StandsOn())
{
crossingInter = thatInter;
standsInter = this;
}
else return null;
Segment transversal = this.AcquireTransversal(thatInter);
// Stands on intersection must have BOTH points not on the transversal line
// |
// ______|______
// |
// |_____
// |
// |
if (!transversal.PointLiesOn(standsInter.CreatesTShape())) return null;
// Success, we have the desired shape
// Acquire return point: offCross
Segment transversalCrossing = crossingInter.GetCollinearSegment(transversal);
return Segment.Between(crossingInter.intersect, transversalCrossing.Point1, standsInter.intersect) ?
transversalCrossing.Point1 : transversalCrossing.Point2;
}
//
// Creates a shape like a crazy person flying
//
// | |
// |_____|___ off
// | |
// | |
//
// Similar to H-shape with an extended point
// Returns the 'larger' intersection that contains the point: off
public KeyValuePair<Intersection, Point> CreatesFlyingShape(Intersection thatInter)
{
KeyValuePair<Intersection, Point> nullPair = new KeyValuePair<Intersection,Point>(null, null);
// A valid transversal is required for this shape
if (!this.CreatesAValidTransversalWith(thatInter)) return nullPair;
// Both intersections must be standing on (and not endpoints)
if (!this.StandsOn() || !thatInter.StandsOn()) return nullPair;
if (this.StandsOnEndpoint() || thatInter.StandsOnEndpoint()) return nullPair;
Point thisTipOfT = this.CreatesTShape();
Point thatTipOfT = thatInter.CreatesTShape();
Segment transversal = this.AcquireTransversal(thatInter);
// We have an H-Shape if the tips of the intersections are at the endpoints of the transversal
if (transversal.PointLiesOnAndBetweenEndpoints(thisTipOfT) && transversal.PointLiesOnAndBetweenEndpoints(thatTipOfT)) return nullPair;
Intersection retInter = null;
Point off = null;
if (transversal.PointLiesOnAndBetweenEndpoints(thisTipOfT))
{
retInter = thatInter;
off = thatTipOfT;
}
else
{
retInter = this;
off = thisTipOfT;
}
return new KeyValuePair<Intersection, Point>(retInter, off);
}
//
// Creates a Chair
//
// | | |
// |_____|____ leftInter |_________ tipOfT
// | | |
// | | |
// off tipOfT
//
// bottomInter
//
// <leftInter, bottomInter>
// Returns the legs of the chair in specific ordering: <off, bottomTip>
public KeyValuePair<Point, Point> CreatesChairShape(Intersection thatInter)
{
KeyValuePair<Point, Point> nullPair = new KeyValuePair<Point, Point>(null, null);
// A valid transversal is required for this shape
if (!this.CreatesAValidTransversalWith(thatInter)) return nullPair;
// Both intersections must be standing on (and not endpoints)
if (!this.StandsOn() || !thatInter.StandsOn()) return nullPair;
if (this.StandsOnEndpoint() || thatInter.StandsOnEndpoint()) return nullPair;
Point thisTipOfT = this.CreatesTShape();
Point thatTipOfT = thatInter.CreatesTShape();
Segment transversal = this.AcquireTransversal(thatInter);
Intersection leftInter = null;
Intersection bottomInter = null;
// Avoid:
// |
// |______
// | |
// | |
// this is leftInter
Point bottomTip = null;
if (transversal.PointLiesOn(thisTipOfT))
{
if (transversal.PointLiesOnAndBetweenEndpoints(thisTipOfT)) return nullPair;
leftInter = this;
bottomInter = thatInter;
bottomTip = thisTipOfT;
}
// thatInter is leftInter
else if (transversal.PointLiesOn(thatTipOfT))
{
if (transversal.PointLiesOnAndBetweenEndpoints(thatTipOfT)) return nullPair;
leftInter = thatInter;
bottomInter = this;
bottomTip = thisTipOfT;
}
// Otherwise, this indicates a PI-shaped scenario
else return nullPair;
//
// Returns the bottom of the legs of the chair
//
Segment parallelLeft = leftInter.OtherSegment(transversal);
Segment crossingTester = new Segment(parallelLeft.Point1, bottomTip);
Point intersection = transversal.FindIntersection(crossingTester);
Point off = transversal.PointLiesOnAndBetweenEndpoints(intersection) ? parallelLeft.Point2 : parallelLeft.Point1;
return new KeyValuePair<Point, Point>(off, bottomTip);
}
// Corresponding angles if:
// offRightEnd
// standsOn (o) o e
// o e standsOnEndpoint (e)
// offLeftEnd eeeoeeeeeeee
// o
// o
//
// Returns <offLeftEnd, offRightEnd>
//
public KeyValuePair<Point, Point> CreatesSimpleTShape(Intersection thatInter)
{
KeyValuePair<Point, Point> nullPair = new KeyValuePair<Point, Point>(null, null);
// A valid transversal is required for this shape
if (!this.CreatesAValidTransversalWith(thatInter)) return nullPair;
if (this.StandsOnEndpoint() && thatInter.StandsOnEndpoint()) return nullPair;
//
// Determine which is the crossing intersection and which stands on the endpoints
//
Intersection endpointInter = null;
Intersection standsInter = null;
if (this.StandsOnEndpoint() && thatInter.StandsOn())
{
endpointInter = this;
standsInter = thatInter;
}
else if (thatInter.Crossing() && this.StandsOnEndpoint())
{
endpointInter = thatInter;
standsInter = this;
}
else return nullPair;
//
// Determine if the endpoint intersection extends beyond the stands parallel line
//
Segment transversal = this.AcquireTransversal(thatInter);
Segment transversalEndpoint = endpointInter.GetCollinearSegment(transversal);
if (transversal.PointLiesOnAndBetweenEndpoints(transversalEndpoint.Point1) &&
transversal.PointLiesOnAndBetweenEndpoints(transversalEndpoint.Point2)) return nullPair;
//
// Acquire the returning points
//
Segment parallelEndpoint = endpointInter.OtherSegment(transversal);
Point offLeftEnd = transversalEndpoint.OtherPoint(endpointInter.intersect);
Point offRightEnd = parallelEndpoint.OtherPoint(endpointInter.intersect);
return new KeyValuePair<Point, Point>(offLeftEnd, offRightEnd);
}
// top
// o
// offStands oooooooe
// e
//offEndpoint eeeeeee
// o
// bottom
// Returns: <offEndpoint, offStands>
public KeyValuePair<Point, Point> CreatesSimplePIShape(Intersection thatInter)
{
KeyValuePair<Point, Point> nullPair = new KeyValuePair<Point, Point>(null, null);
// A valid transversal is required for this shape
if (!this.CreatesAValidTransversalWith(thatInter)) return nullPair;
// Restrict to desired combination
if (this.StandsOnEndpoint() && thatInter.StandsOnEndpoint()) return nullPair;
//
// Determine which is the stands and which is the endpoint
//
Intersection endpointInter = null;
Intersection standsInter = null;
if (this.StandsOnEndpoint() && thatInter.StandsOn())
{
endpointInter = this;
standsInter = thatInter;
}
else if (thatInter.StandsOnEndpoint() && this.StandsOn())
{
endpointInter = this;
standsInter = thatInter;
}
else return nullPair;
//
// Avoid Some shapes
//
Segment transversal = this.AcquireTransversal(thatInter);
Segment transversalStands = standsInter.GetCollinearSegment(transversal);
Point top = null;
Point bottom = null;
if (Segment.Between(standsInter.intersect, transversalStands.Point1, endpointInter.intersect))
{
top = transversalStands.Point1;
bottom = transversalStands.Point2;
}
else
{
top = transversalStands.Point2;
bottom = transversalStands.Point1;
}
// Avoid: ____ Although this shouldn't happen since both intersections do not stand on endpoints
// ____|
//
// Also avoid Simple F-Shape
//
if (transversal.HasPoint(top) || transversal.HasPoint(bottom)) return nullPair;
// Determine S shape
Point offStands = standsInter.CreatesTShape();
Segment parallelEndpoint = endpointInter.OtherSegment(transversal);
Point offEndpoint = parallelEndpoint.OtherPoint(endpointInter.intersect);
Segment crossingTester = new Segment(offStands, offEndpoint);
Point intersection = transversal.FindIntersection(crossingTester);
// S-shape // PI-Shape
return transversal.PointLiesOnAndBetweenEndpoints(intersection) ? nullPair : new KeyValuePair<Point, Point>(offEndpoint, offStands);
}
// top
// o
// offStands oooooooe
// e
//offEndpoint eeeeeee
// o
// bottom
// Returns: <offEndpoint, offStands>
public KeyValuePair <Point, Point> CreatesSimplePIShape(Intersection thatInter)
{
KeyValuePair <Point, Point> nullPair = new KeyValuePair <Point, Point>(null, null);
// A valid transversal is required for this shape
if (!this.CreatesAValidTransversalWith(thatInter))
{
return(nullPair);
}
// Restrict to desired combination
if (this.StandsOnEndpoint() && thatInter.StandsOnEndpoint())
{
return(nullPair);
}
//
// Determine which is the stands and which is the endpoint
//
Intersection endpointInter = null;
Intersection standsInter = null;
if (this.StandsOnEndpoint() && thatInter.StandsOn())
{
endpointInter = this;
standsInter = thatInter;
}
else if (thatInter.StandsOnEndpoint() && this.StandsOn())
{
endpointInter = this;
standsInter = thatInter;
}
else
{
return(nullPair);
}
//
// Avoid Some shapes
//
Segment transversal = this.AcquireTransversal(thatInter);
Segment transversalStands = standsInter.GetCollinearSegment(transversal);
Point top = null;
Point bottom = null;
if (Segment.Between(standsInter.intersect, transversalStands.Point1, endpointInter.intersect))
{
top = transversalStands.Point1;
bottom = transversalStands.Point2;
}
else
{
top = transversalStands.Point2;
bottom = transversalStands.Point1;
}
// Avoid: ____ Although this shouldn't happen since both intersections do not stand on endpoints
// ____|
//
// Also avoid Simple F-Shape
//
if (transversal.HasPoint(top) || transversal.HasPoint(bottom))
{
return(nullPair);
}
// Determine S shape
Point offStands = standsInter.CreatesTShape();
Segment parallelEndpoint = endpointInter.OtherSegment(transversal);
Point offEndpoint = parallelEndpoint.OtherPoint(endpointInter.intersect);
Segment crossingTester = new Segment(offStands, offEndpoint);
Point intersection = transversal.FindIntersection(crossingTester);
// S-shape // PI-Shape
return(transversal.PointLiesOnAndBetweenEndpoints(intersection) ? nullPair : new KeyValuePair <Point, Point>(offEndpoint, offStands));
}
//
// Creates a Chair
//
// | | |
// |_____|____ leftInter |_________ tipOfT
// | | |
// | | |
// off tipOfT
//
// bottomInter
//
// <leftInter, bottomInter>
// Returns the legs of the chair in specific ordering: <off, bottomTip>
public KeyValuePair <Point, Point> CreatesChairShape(Intersection thatInter)
{
KeyValuePair <Point, Point> nullPair = new KeyValuePair <Point, Point>(null, null);
// A valid transversal is required for this shape
if (!this.CreatesAValidTransversalWith(thatInter))
{
return(nullPair);
}
// Both intersections must be standing on (and not endpoints)
if (!this.StandsOn() || !thatInter.StandsOn())
{
return(nullPair);
}
if (this.StandsOnEndpoint() || thatInter.StandsOnEndpoint())
{
return(nullPair);
}
Point thisTipOfT = this.CreatesTShape();
Point thatTipOfT = thatInter.CreatesTShape();
Segment transversal = this.AcquireTransversal(thatInter);
Intersection leftInter = null;
Intersection bottomInter = null;
// Avoid:
// |
// |______
// | |
// | |
// this is leftInter
Point bottomTip = null;
if (transversal.PointLiesOn(thisTipOfT))
{
if (transversal.PointLiesOnAndBetweenEndpoints(thisTipOfT))
{
return(nullPair);
}
leftInter = this;
bottomInter = thatInter;
bottomTip = thisTipOfT;
}
// thatInter is leftInter
else if (transversal.PointLiesOn(thatTipOfT))
{
if (transversal.PointLiesOnAndBetweenEndpoints(thatTipOfT))
{
return(nullPair);
}
leftInter = thatInter;
bottomInter = this;
bottomTip = thisTipOfT;
}
// Otherwise, this indicates a PI-shaped scenario
else
{
return(nullPair);
}
//
// Returns the bottom of the legs of the chair
//
Segment parallelLeft = leftInter.OtherSegment(transversal);
Segment crossingTester = new Segment(parallelLeft.Point1, bottomTip);
Point intersection = transversal.FindIntersection(crossingTester);
Point off = transversal.PointLiesOnAndBetweenEndpoints(intersection) ? parallelLeft.Point2 : parallelLeft.Point1;
return(new KeyValuePair <Point, Point>(off, bottomTip));
}
//
// Creates an H-Shape
//
// | |
// |_____|
// | |
// | |
//
public bool CreatesHShape(Intersection thatInter)
{
// A valid transversal is required for this shape
if (!this.CreatesAValidTransversalWith(thatInter)) return false;
// Both intersections must be standing on (and not endpoints)
if (!this.StandsOn() || !thatInter.StandsOn()) return false;
if (this.StandsOnEndpoint() || this.StandsOnEndpoint()) return false;
Point thisTipOfT = this.CreatesTShape();
Point thatTipOfT = thatInter.CreatesTShape();
Segment transversal = this.AcquireTransversal(thatInter);
// The tips of the intersections must be within the transversal (at the endpoint) for an H
if (!transversal.PointLiesOnAndBetweenEndpoints(thisTipOfT)) return false;
if (!transversal.PointLiesOnAndBetweenEndpoints(thatTipOfT)) return false;
return true;
}
//
// Creates a Leaner-Shape (a bench you can sit on)
//
// top
// |______ tipStands
// |
// tipEndpt ______|
//
// Returns <tipEndpoint, tipStands>
public KeyValuePair<Point, Point> CreatesLeanerShape(Intersection thatInter)
{
KeyValuePair<Point, Point> nullPair = new KeyValuePair<Point, Point>(null, null);
// A valid transversal is required for this shape
if (!this.CreatesAValidTransversalWith(thatInter)) return nullPair;
if (this.StandsOnEndpoint() && thatInter.StandsOnEndpoint()) return nullPair;
//
// Determine which is the stands and which is the endpoint
//
Intersection endpointInter = null;
Intersection standsInter = null;
if (this.StandsOnEndpoint() && thatInter.StandsOn())
{
endpointInter = this;
standsInter = thatInter;
}
else if (thatInter.StandsOnEndpoint() && this.StandsOn())
{
endpointInter = thatInter;
standsInter = this;
}
else return nullPair;
//
// Acquire Points
//
Point tipStands = standsInter.CreatesTShape();
Segment transversal = this.AcquireTransversal(thatInter);
Segment parallelEndpoint = endpointInter.OtherSegment(transversal);
Point tipEndpoint = parallelEndpoint.OtherPoint(endpointInter.intersect);
// Determine sides
Segment crossingTester = new Segment(tipEndpoint, tipStands);
Point intersection = transversal.FindIntersection(crossingTester);
// F-Shape
if (!transversal.PointLiesOnAndBetweenEndpoints(intersection)) return nullPair;
// Desired Leaner shape
return new KeyValuePair<Point, Point>(tipEndpoint, tipStands);
}
// top
// o
// offStands oooooooe
// e
//offEndpoint eeeeeee
// o
// bottom
// Returns: <offEndpoint, offStands>
private static List<EdgeAggregator> InstantiateSimplePiIntersection(Parallel parallel, Intersection inter1, Intersection inter2, Point offEndpoint, Point offStands)
{
List<EdgeAggregator> newGrounded = new List<EdgeAggregator>();
//
// Determine which is the endpoint and stands intersections
//
Intersection endpointInter = null;
Intersection standsInter = null;
if (inter1.StandsOnEndpoint() && inter2.StandsOn())
{
endpointInter = inter1;
standsInter = inter2;
}
else if (inter2.StandsOnEndpoint() && inter1.StandsOn())
{
endpointInter = inter2;
standsInter = inter1;
}
else return newGrounded;
//
// Determine the top and bottom points
//
Segment transversal = inter1.AcquireTransversal(inter2);
Segment transversalStands = standsInter.GetCollinearSegment(transversal);
Point top = null;
Point bottom = null;
if (Segment.Between(standsInter.intersect, transversalStands.Point1, endpointInter.intersect))
{
top = transversalStands.Point1;
bottom = transversalStands.Point2;
}
else
{
top = transversalStands.Point2;
bottom = transversalStands.Point1;
}
//
// Generate the new congruences
//
List<CongruentAngles> newAngleRelations = new List<CongruentAngles>();
GeometricCongruentAngles gca = new GeometricCongruentAngles(new Angle(top, standsInter.intersect, offStands),
new Angle(standsInter.intersect, endpointInter.intersect, offEndpoint));
newAngleRelations.Add(gca);
gca = new GeometricCongruentAngles(new Angle(bottom, endpointInter.intersect, offEndpoint),
new Angle(endpointInter.intersect, standsInter.intersect, offStands));
newAngleRelations.Add(gca);
return MakeRelations(newAngleRelations, parallel, inter1, inter2);
}
//
// o
// eoooooooo offStands
// e
//offEndpoint eeeeeee
// o
// Returns: <offEndpoint, offStands>
public KeyValuePair<Point, Point> CreatesSimpleSShape(Intersection thatInter)
{
KeyValuePair<Point, Point> nullPair = new KeyValuePair<Point, Point>(null, null);
// A valid transversal is required for this shape
if (!this.CreatesAValidTransversalWith(thatInter)) return nullPair;
// Restrict to desired combination
if (this.StandsOnEndpoint() && thatInter.StandsOnEndpoint()) return nullPair;
//
// Determine which is the stands and which is the endpoint
//
Intersection endpointInter = null;
Intersection standsInter = null;
if (this.StandsOnEndpoint() && thatInter.StandsOn())
{
endpointInter = this;
standsInter = thatInter;
}
else if (thatInter.StandsOnEndpoint() && this.StandsOn())
{
endpointInter = this;
standsInter = thatInter;
}
else return nullPair;
// Determine S shape
Point offStands = standsInter.CreatesTShape();
Segment transversal = this.AcquireTransversal(thatInter);
Segment parallelEndpoint = endpointInter.OtherSegment(transversal);
Point offEndpoint = parallelEndpoint.OtherPoint(endpointInter.intersect);
Segment crossingTester = new Segment(offStands, offEndpoint);
Point intersection = transversal.FindIntersection(crossingTester);
return transversal.PointLiesOnAndBetweenEndpoints(intersection) ? new KeyValuePair<Point, Point>(offEndpoint, offStands) : nullPair;
}
// Corresponding angles if:
// sameSide offRightEnd
// standsOn (o) o e
// o e standsOnEndpoint (e)
// offLeftEnd eeeoeeeeeeee
// o
// o
//
// Returns <offLeftEnd, offRightEnd>
//
private static List<EdgeAggregator> InstantiateSimpleTIntersection(Parallel parallel, Intersection inter1, Intersection inter2, Point offLeftEnd, Point offRightEnd)
{
List<EdgeAggregator> newGrounded = new List<EdgeAggregator>();
//
// Determine which is the endpoint and stands intersections
//
Intersection endpointInter = null;
Intersection standsInter = null;
if (inter1.StandsOnEndpoint() && inter2.StandsOn())
{
endpointInter = inter1;
standsInter = inter2;
}
else if (inter2.StandsOnEndpoint() && inter1.StandsOn())
{
endpointInter = inter2;
standsInter = inter1;
}
else return newGrounded;
// Determine the sameSide point
Segment transversal = inter1.AcquireTransversal(inter2);
Segment parallelStands = standsInter.OtherSegment(transversal);
Segment crossingTester = new Segment(offRightEnd, parallelStands.Point1);
Point intersection = transversal.FindIntersection(crossingTester);
Point sameSide = transversal.PointLiesOnAndBetweenEndpoints(intersection) ? parallelStands.Point2 : parallelStands.Point1;
//
// Generate the new congruence
//
List<CongruentAngles> newAngleRelations = new List<CongruentAngles>();
GeometricCongruentAngles gca = new GeometricCongruentAngles(new Angle(offLeftEnd, standsInter.intersect, sameSide),
new Angle(standsInter.intersect, endpointInter.intersect, offRightEnd));
newAngleRelations.Add(gca);
return MakeRelations(newAngleRelations, parallel, inter1, inter2);
}
// A B
// \ /
// \ /
// \/
// /\ X
// / \
// / \
// C D
//
// Intersection(X, Segment(A, D), Segment(B, C)) -> Supplementary(Angle(A, X, B), Angle(B, X, D))
// Supplementary(Angle(B, X, D), Angle(D, X, C))
// Supplementary(Angle(D, X, C), Angle(C, X, A))
// Supplementary(Angle(C, X, A), Angle(A, X, B))
//
public static List<EdgeAggregator> InstantiateToSupplementary(Intersection inter)
{
List<EdgeAggregator> newGrounded = new List<EdgeAggregator>();
// The situation looks like this:
// |
// |
// |_______
//
if (inter.StandsOnEndpoint()) return newGrounded;
// The situation looks like this:
// |
// |
// _____|_______
//
if (inter.StandsOn())
{
Point up = null;
Point left = null;
Point right = null;
if (inter.lhs.HasPoint(inter.intersect))
{
up = inter.lhs.OtherPoint(inter.intersect);
left = inter.rhs.Point1;
right = inter.rhs.Point2;
}
else
{
up = inter.rhs.OtherPoint(inter.intersect);
left = inter.lhs.Point1;
right = inter.lhs.Point2;
}
// Gets the single angle object from the original figure
Angle newAngle1 = Angle.AcquireFigureAngle(new Angle(left, inter.intersect, up));
Angle newAngle2 = Angle.AcquireFigureAngle(new Angle(right, inter.intersect, up));
Supplementary supp = new Supplementary(newAngle1, newAngle2);
supp.SetNotASourceNode();
supp.SetNotAGoalNode();
supp.SetClearDefinition();
newGrounded.Add(new EdgeAggregator(MakeAntecedent(inter, supp.angle1, supp.angle2), supp, annotation));
}
//
// The situation is standard and results in 4 supplementary relationships
//
else
{
Angle newAngle1 = Angle.AcquireFigureAngle(new Angle(inter.lhs.Point1, inter.intersect, inter.rhs.Point1));
Angle newAngle2 = Angle.AcquireFigureAngle(new Angle(inter.lhs.Point1, inter.intersect, inter.rhs.Point2));
Angle newAngle3 = Angle.AcquireFigureAngle(new Angle(inter.lhs.Point2, inter.intersect, inter.rhs.Point1));
Angle newAngle4 = Angle.AcquireFigureAngle(new Angle(inter.lhs.Point2, inter.intersect, inter.rhs.Point2));
List<Supplementary> newSupps = new List<Supplementary>();
newSupps.Add(new Supplementary(newAngle1, newAngle2));
newSupps.Add(new Supplementary(newAngle2, newAngle4));
newSupps.Add(new Supplementary(newAngle3, newAngle4));
newSupps.Add(new Supplementary(newAngle3, newAngle1));
foreach (Supplementary supp in newSupps)
{
supp.SetNotASourceNode();
supp.SetNotAGoalNode();
supp.SetClearDefinition();
newGrounded.Add(new EdgeAggregator(MakeAntecedent(inter, supp.angle1, supp.angle2), supp, annotation));
}
}
return newGrounded;
}
//
// Creates an F-Shape
// top
// _____ offEnd <--- Stands on Endpt
// |
// |_____ offStands <--- Stands on
// |
// |
// bottom
// Order of non-collinear points is order of intersections: <this, that>
public KeyValuePair <Point, Point> CreatesFShape(Intersection thatInter)
{
KeyValuePair <Point, Point> nullPair = new KeyValuePair <Point, Point>(null, null);
// A valid transversal is required for this shape
if (!this.CreatesAValidTransversalWith(thatInter))
{
return(nullPair);
}
// Avoid both standing on an endpoint
if (this.StandsOnEndpoint() && thatInter.StandsOnEndpoint())
{
return(nullPair);
}
Intersection endpt = null;
Intersection standsOn = null;
if (this.StandsOnEndpoint() && thatInter.StandsOn())
{
endpt = this;
standsOn = thatInter;
}
else if (thatInter.StandsOnEndpoint() && this.StandsOn())
{
endpt = thatInter;
standsOn = this;
}
else
{
return(nullPair);
}
Segment transversal = this.AcquireTransversal(thatInter);
Segment transversalStands = standsOn.GetCollinearSegment(transversal);
//
// Determine Top and bottom to avoid PI shape
//
Point top = null;
Point bottom = null;
if (Segment.Between(standsOn.intersect, transversalStands.Point1, endpt.intersect))
{
bottom = transversalStands.Point1;
top = transversalStands.Point2;
}
else
{
bottom = transversalStands.Point2;
top = transversalStands.Point1;
}
// Avoid: ____ Although this shouldn't happen since both intersections do not stand on endpoints
// ____|
if (transversal.HasPoint(top) && transversal.HasPoint(bottom))
{
return(nullPair);
}
// Also avoid Simple PI-Shape
//
if (!transversal.HasPoint(top) && !transversal.HasPoint(bottom))
{
return(nullPair);
}
// Find the two points that make the points of the F
Segment parallelEndPt = endpt.OtherSegment(transversal);
Segment parallelStands = standsOn.OtherSegment(transversal);
Point offEnd = transversal.PointLiesOn(parallelEndPt.Point1) ? parallelEndPt.Point2 : parallelEndPt.Point1;
Point offStands = transversal.PointLiesOn(parallelStands.Point1) ? parallelStands.Point2 : parallelStands.Point1;
// Check this is not a crazy F
// _____
// |
// ____|
// |
// |
Point intersection = transversal.FindIntersection(new Segment(offEnd, offStands));
if (transversal.PointLiesOnAndBetweenEndpoints(intersection))
{
return(nullPair);
}
// Return in the order of 'off' points: <this, that>
return(this.Equals(endpt) ? new KeyValuePair <Point, Point>(offEnd, offStands) : new KeyValuePair <Point, Point>(offStands, offEnd));
}