public override List <double> Intersect(SimpleObject obj)
{
if (obj is StraightLine)
{
return(LineLineIntersect(this.args, obj.args));
}
else if (obj is Circle)
{
return(LineCircleIntersect(this.args, obj.args));
}
else if (obj is RayLine)
{
List <double> intersection = LineLineIntersect(this.args, obj.args);
// Need to check if the intersection points is on the ray line.
if (intersection.Count >= 2 &&
Dot(obj.args[0], obj.args[1], obj.args[2], obj.args[3],
obj.args[0], obj.args[1], intersection[0], intersection[1]) < 0)
{
intersection.Clear();
}
return(intersection);
}
else
{
List <double> intersection = LineLineIntersect(this.args, obj.args);
// Need to check if the intersection points is on the line segment.
if (intersection.Count >= 2 &&
Dot(intersection[0], intersection[1], obj.args[0], obj.args[1],
intersection[0], intersection[1], obj.args[2], obj.args[3]) > 0)
{
intersection.Clear();
}
return(intersection);
}
}
// Compute the intersection points between two geometric objects. public abstract List <double> Intersect(SimpleObject obj);