public void TestOverlap2()
{
RECT r0 = new RECT( 10,0,10,10);
RECT r1 = new RECT( 0,0,10,10);
Assertion.Assert( r1.overlaps(r0) );
Assertion.Assert( !r1.overlaps_interior(r0) );
}
public static int decompose_overlapping(RECT A, RECT B, RECT [] ra)
{
int overlaps = 0;
RECT C;
RECT i;
if (A.overlaps_interior(B))
{
if (B.y0 < A.y0)
{
//0
C = new RECT(B.x0, B.y0, B.w, A.y0 - B.y0);
i = C.intersection(B);
if (!is_sliver(i))
{
ra[overlaps] = i;
RECTTOOLS.CHECK_NO_INTERIOR_OVERLAP(C, A);
overlaps++;
}
}
if (B.x1 > A.x1)
{
//1
C = RECT.FromPoints(A.x1, A.y0, B.x1, A.y1);
i = C.intersection(B);
if (!is_sliver(i))
{
RECTTOOLS.CHECK_NO_INTERIOR_OVERLAP(C, A);
ra[overlaps] = i;
overlaps++;
}
}
if (B.x0 < A.x0)
{
//2
C = RECT.FromPoints(B.x0, A.y0, A.x0, A.y1);
i = C.intersection(B);
if (!is_sliver(i))
{
RECTTOOLS.CHECK_NO_INTERIOR_OVERLAP(C, A);
ra[overlaps] = i;
overlaps++;
}
}
if (B.y1 > A.y1)
{
//3
C = new RECT(B.x0, A.y1, B.w, B.y1 - A.y1);
i = C.intersection(B);
if (!is_sliver(i))
{
ra[overlaps] = i;
overlaps++;
}
}
}
return(overlaps);
}
public static void CHECK_NO_INTERIOR_OVERLAP(RECT A, RECT B)
{
if (A.overlaps_interior(B))
{
RECT i = A.intersection(B);
if ((i.w >= 1.0) && (i.h >= 1.0))
{
throw new Exception("should not overlap");
}
}
}
public void TestOverlap1()
{
RECT r0 = new RECT( 0,0,10,10);
RECT r1 = new RECT( 10,10,20,20);
RECT r2 = new RECT( 11,11,20,20);
RECT r3 = new RECT( 9.999,9.999,20,20);
Assertion.Assert( r1.overlaps(r0) );
Assertion.Assert( !r1.overlaps_interior(r0) );
Assertion.Assert( !r2.overlaps(r0) );
Assertion.Assert( r3.overlaps(r0) );
Assertion.Assert( r3.overlaps_interior(r0) );
}