public Surface(SurfaceType type, Vector2 start, Vector2 end)
{
surfaceLineSegment = new LineSegment(start, end);
m_type = type;
construct();
}
public Surface(Tower a, Tower b, SurfaceType type, Level Parent)
{
tower_A = a; tower_A.AddSurface(this);
tower_B = b; tower_B.AddSurface(this);
m_type = type;
surfaceLineSegment = new LineSegment(a.getPosition(), b.getPosition());
parent = Parent;
construct();
}
/* PUBLIC STATIC */
static bool Intersects(LineSegment first, LineSegment second)
{
return false;
}
static Vector2? IntersectionPoint(LineSegment first, LineSegment second)
{
return null;
}
private float findIntersection(LineSegment segment)
{
Vector2 u = End - Start;
Vector2 v = segment.End - segment.Start;
Vector2 w = Start - segment.Start;
Vector2 vPerp = new Vector2(-v.Y, v.X);
vPerp.Normalize();
if ((Vector2.Dot(Start - segment.Start, vPerp)) > 0) {
// Need to flip!!
//v = segment.Start - segment.End;
}
float tIntersect = (v.Y * w.X - v.X * w.Y) / (v.X * u.Y - v.Y * u.X);
if (tIntersect >= 0f && tIntersect <= 1f) {
float sIntersect = (u.X * w.Y - u.Y * w.X) / (u.X * v.Y - u.Y * v.X);
if (sIntersect > 0f && sIntersect < 1f) {
return tIntersect * Length;
}
}
return -1f;
}
public bool IsColliding(LineSegment segment)
{
float tIntersect = findIntersection(segment);
return (tIntersect >= 0f);
}
public Vector2? FindIntersectionPoint(LineSegment segment)
{
float tIntersect = findIntersection(segment);
if (tIntersect < 0) {
return null;
}
Vector2 u = End - Start;
u.Normalize();
Vector2 pIntersect = Start + tIntersect * u;
return pIntersect;
}
public float Chomp(LineSegment segment)
{
if (!IsColliding(segment)) {
return 0f;
}
float amountToChomp = findIntersection(segment);
Chomp(amountToChomp);
return amountToChomp;
}