public static bool TestOverlap(LineMask lnMask, AABBMask rMask)
{
VectorFP p0 = (VectorFP)lnMask._pos + lnMask._p0;
VectorFP p1 = new VectorFP(p0.X + lnMask._w, p0.Y + lnMask._h);
return rMask.IntersectsLine(p0, p1);
}
/*public override TestResult TestOverlapExt (Mask mask)
{
switch (mask._type) {
case MaskType.Point:
return CollisionTR.TestOverlap(mask as PointMask, this);
case MaskType.Line:
return CollisionTR.TestOverlap(this, mask as LineMask);
case MaskType.Circle:
return CollisionTR.TestOverlap(this, mask as CircleMask);
case MaskType.AABB:
return CollisionTR.TestOverlap(this, mask as AABBMask);
case MaskType.Triangle:
return CollisionTR.TestOverlap(this, mask as TriangleMask);
}
return TestResult.None;
}
public TestResult TestOverlapExt (PointMask mask)
{
return CollisionTR.TestOverlap(mask, this);
}
public TestResult TestOverlapExt (LineMask mask)
{
return CollisionTR.TestOverlap(this, mask);
}
public TestResult TestOverlapExt (CircleMask mask)
{
return CollisionTR.TestOverlap(this, mask);
}
public TestResult TestOverlapExt (AABBMask mask)
{
return CollisionTR.TestOverlap(this, mask);
}
public TestResult TestOverlapExt (TriangleMask mask)
{
return CollisionTR.TestOverlap(this, mask);
}
internal static FPInt Signed2DTriArea (PointFP a, PointFP b, PointFP c)
{
return (a.X - c.X) * (b.Y - c.Y) - (a.Y - c.Y) * (b.X - c.X);
}
internal TestResult LineIntersect (PointFP a, PointFP b)
{
VectorFP c = (VectorFP)_pos + _p0;
VectorFP d = c + new VectorFP(_w, _h);
return LineIntersect(a, b, c, d);
}
internal static TestResult LineIntersect (PointFP a, PointFP b, PointFP c, PointFP d)
{
FPInt a1 = Signed2DTriArea(a, b, d);
FPInt a2 = Signed2DTriArea(a, b, c);
FPInt t1 = a1 * a2;
// Deal with colinear lines
if (a1 == 0 && a2 == 0) {
if (a.X == c.X && !RangesOverlap(a.Y, b.Y, c.Y, d.Y)) {
return TestResult.None;
}
else if (!RangesOverlap(a.X, b.X, c.X, d.X)) {
return TestResult.None;
}
return TestResult.Overlapping | TestResult.Edge;
}
// Now deal with normal intersections
else if (t1 <= 0) {
FPInt a3 = Signed2DTriArea(c, d, a);
FPInt a4 = a3 + a2 - a1;
FPInt t2 = a3 * a4;
if (t2 <= 0) {
if (t1 * t2 == 0) {
return TestResult.Overlapping | TestResult.Edge;
}
else {
return TestResult.Overlapping;
}
}
}
return TestResult.None;
}*/
internal PointFP ClosestPoint(PointFP p)
{
VectorFP a = (VectorFP)_pos + _p0;
VectorFP ab = new VectorFP(_w, _h);
FPInt t = VectorFP.Dot(p - a, ab);
if (t <= 0) {
return a;
}
else {
FPInt d = VectorFP.Dot(ab, ab);
if (t >= d) {
return a + ab;
}
else {
t = t / d;
return a + (t * ab);
}
}
}
