//creates a new boolean box from two, returns false if boxes don't intersect, uses boolean operator to decide the resulting data
public static bool Intersection(BooleanBox a, BooleanBox b, out BooleanBox result, Operation operation)
{
result = null;
//no intersection
if (a.end.AnyLowerOrEqual(b.origo) || b.origo.AnyHigherOrEqual(a.end) || b.end.AnyLowerOrEqual(a.origo) || a.origo.AnyHigherOrEqual(b.end))
{
return(false);
}
//check if other box encapsulates other or create a cross-section
if (a.Contains(b.origo) && a.Contains(b.end))
{
result = new BooleanBox(b.origo, b.size);
}
else if (b.Contains(a.origo) && b.Contains(a.end))
{
result = new BooleanBox(a.origo, a.size);
}
else
{
Vec2I start = Vec2I.SelectMax(a.origo, b.origo);
Vec2I end = Vec2I.SelectMin(a.end, b.end);
result = new BooleanBox(start, end - start);
}
//offsets
Vec2I ao = result.origo - a.origo;
Vec2I bo = result.origo - b.origo;
//boolean method
switch (operation)
{
default:
case Operation.AllFalse:
break;
case Operation.AllTrue:
for (int y = 0; y < result.size.y; y++)
{
for (int x = 0; x < result.size.x; x++)
{
result.data[x, y] = true;
}
}
break;
case Operation.And:
for (int y = 0; y < result.size.y; y++)
{
for (int x = 0; x < result.size.x; x++)
{
result.data[x, y] = a.data[ao.x + x, ao.y + y] && b.data[bo.x + x, bo.y + y];
}
}
break;
case Operation.Or:
for (int y = 0; y < result.size.y; y++)
{
for (int x = 0; x < result.size.x; x++)
{
result.data[x, y] = a.data[ao.x + x, ao.y + y] || b.data[bo.x + x, bo.y + y];
}
}
break;
case Operation.Xor:
for (int y = 0; y < result.size.y; y++)
{
for (int x = 0; x < result.size.x; x++)
{
result.data[x, y] = a.data[ao.x + x, ao.y + y] != b.data[bo.x + x, bo.y + y];
}
}
break;
case Operation.Nor:
for (int y = 0; y < result.size.y; y++)
{
for (int x = 0; x < result.size.x; x++)
{
result.data[x, y] = !a.data[ao.x + x, ao.y + y] && !b.data[bo.x + x, bo.y + y];
}
}
break;
case Operation.CloneA:
for (int y = 0; y < result.size.y; y++)
{
for (int x = 0; x < result.size.x; x++)
{
result.data[x, y] = a.data[ao.x + x, ao.y + y];
}
}
break;
case Operation.CloneB:
for (int y = 0; y < result.size.y; y++)
{
for (int x = 0; x < result.size.x; x++)
{
result.data[x, y] = b.data[bo.x + x, bo.y + y];
}
}
break;
}
return(true);
}
