/**
* Calculates the intersection of slopes of two lines.
*
* @param lineA First line to use for slope.
* @param lineB Second line to use for slope.
* @param options Optional IPathIntersectionOptions.
* @returns point of intersection of the two slopes, or null if the slopes did not intersect.
*/
internal static Vector2?FromSlopeIntersection(Line lineA, Line lineB, out bool AreOverlapped, bool excludeTangents = false)
{
var slopeA = Slope.Of(lineA.P1, lineA.P2);
var slopeB = Slope.Of(lineB.P1, lineB.P2);
AreOverlapped = false;
//see if slope are parallel
if (Slope.AreParallel(slopeA, slopeB))
{
if (Slope.AreEqual(slopeA, slopeB))
{
//check for overlap
AreOverlapped = Helper.IsLineOverlapping(lineA, lineB, excludeTangents);
}
return(null);
}
Vector2?pointOfIntersection = null;
if (!slopeA.HasValue)
{
pointOfIntersection = verticalIntersectionPoint(lineA, slopeB);
}
else if (!slopeB.HasValue)
{
pointOfIntersection = verticalIntersectionPoint(lineB, slopeA);
}
else
{
// find intersection by line equation
double x = (slopeB.YIntercept - slopeA.YIntercept) / (slopeA.Value - slopeB.Value);
double y = slopeA.Value * x + slopeA.YIntercept;
pointOfIntersection = new Vector2((double)x, (double)y);
}
return(pointOfIntersection);
}
