public static Point?getIntersectionCoordinates(CustomLine l1, CustomLine l2)
{
Point intersectionPoint = new Point();
// if parallel
if (l1.getSlope() == l2.getSlope())
{
return(null);
}
// if either one is vertical (but not both because we would have returned null already)
else if (l1.getIsVertical())
{
intersectionPoint.X = l1.getPoint1().X;
Point l2Point = l2.getPoint1();
intersectionPoint.Y = (intersectionPoint.X * l2.getSlope()) + l2.getConstant();
}
else if (l2.getIsVertical())
{
intersectionPoint.X = l2.getPoint1().X;
Point l1Point = l1.getPoint1();
intersectionPoint.Y = (intersectionPoint.X * l1.getSlope()) + l1.getConstant();
}
else
{
Point l1Point = l1.getPoint1();
Point l2Point = l2.getPoint1();
double a1 = l1Point.Y - l1.getSlope() * l1Point.X;
double a2 = l2Point.Y - l2.getSlope() * l2Point.X;
intersectionPoint.X = (a1 - a2) / (l2.getSlope() - l1.getSlope());
intersectionPoint.Y = a2 + l2.getSlope() * intersectionPoint.X;
}
return(intersectionPoint);
}
