bool Sprite::pixCollision(const Sprite& other) const
{
// If bounding rectangles do not intersect, sprites
// do not collide
if (!rect.intersects(other.getBox()))
{
return false;
}
else
{
Rectf inter = intersection(other.getBox());
// Loop over region
int height = (int)(inter.Height());
int width = (int)(inter.Width());
int xOff = (int)(inter.MinX() - pos.X());
int xOffOther = (int)(inter.MinX() - other.getPos().X());
int yOff = (int)(inter.MinY() - pos.Y());
int yOffOther = (int)(inter.MinY() - other.getPos().Y());
for (int i = 0; i < height; i++)
{
for (int j = 0; j < width; j++)
{
// If pixel in current cell at (i, j) is non-transparent
// for both sprites, then they do intersect
bool thisIsTransparent = sheets[animations[current.X()].first.X().X()]->isPixTransparent(
currentCell, j + xOff, i + yOff);
bool otherIsTransparent = other.getSheet().isPixTransparent(
other.currentCell, j + xOffOther, i + yOffOther);
if (!thisIsTransparent && !otherIsTransparent)
{
return true;
}
}
}
// All pixels in region checked, there is no intersection
return false;
}
}
Rectf Sprite::intersection(const Rectf &box) const
{
if (!rect.intersects(box))
{
return Rectf();
}
else
{
return Rectf(
max(rect.MinX(), box.MinX()), // Min X
min(rect.MaxX(), box.MaxX()), // Max X
max(rect.MinY(), box.MinY()), // Min Y
min(rect.MaxY(), box.MaxY()) ); // Max Y
}
}
