public Vector2D GetCenter()
{
Vector2D directionalVector = end.Difference(start);
Vector2D center = start.Add(directionalVector.Multiply(0.5));
return(center);
}
public static bool SegmentsLieOnTopOfEachOther(Segment2D firstSegment, Segment2D secondSegment)
{
bool onTop = false;
Vector2D[] firstSegmentsVertices = firstSegment.GetVertices();
Vector2D firstSegmentsStart_A = firstSegmentsVertices[0];
Vector2D firstSegmentsEnd_B = firstSegmentsVertices[1];
Vector2D firstSegmentsDirection = firstSegmentsEnd_B.Difference(firstSegmentsStart_A);
double firstsegmentsLength = firstSegmentsDirection.normalize();
Vector2D secondSegmentsStart_C = secondSegment.GetVertices()[0];
Vector2D secondSegmentsEnd_D = secondSegment.GetVertices()[1];
Vector2D secondSegmentsDirection = secondSegmentsEnd_D.Difference(secondSegmentsStart_C);
double secondSegmentsLength = secondSegmentsDirection.normalize();
Vector2D vectorAC = secondSegmentsStart_C.Difference(firstSegmentsStart_A);
Vector2D vectorAD = secondSegmentsEnd_D.Difference(firstSegmentsStart_A);
if (VectorsAreLinearDependent(vectorAC, vectorAD))
{
double cos = firstSegmentsDirection.Dot(secondSegmentsDirection) / (firstsegmentsLength * secondSegmentsLength);
if (cos < 0)
{
firstSegmentsStart_A = firstSegmentsVertices[1];
firstSegmentsEnd_B = firstSegmentsVertices[0];
}
vectorAC = secondSegmentsStart_C.Difference(firstSegmentsStart_A);
Vector2D vectorDB = firstSegmentsEnd_B.Difference(secondSegmentsEnd_D);
cos = vectorAC.Dot(vectorDB) / (vectorAC.normalize() * vectorDB.normalize());
if (cos > 0)
{
onTop = true;
}
}
return(onTop);
}