/** Get the rectangle which contains all other rectangles */
public Rect4f getBoundingBox() {
if (_bounding_box == null) {
float left = Float.MAX_VALUE;
float right = Float.MIN_VALUE;
float top = Float.MIN_VALUE;
float bottom = Float.MAX_VALUE;
// Find maximum bounding box
for (Rect4f rect : items.keySet()) {
if (rect.left() < left) left = rect.left();
if (rect.right() > right) right = rect.right();
if (rect.bottom() < bottom) bottom = rect.bottom();
if (rect.top() > top) top = rect.top();
}
// avoid MAX_VALUE and MIN_VALUE
if (items.isEmpty()) {
left = -0.01f;
right = 0.01f;
top = 0.01f;
bottom = -0.01f;
}
_bounding_box = new Rect4f(left, top, right - left, top - bottom);
}
return _bounding_box;
}
/**
* Get the item which has a rectangle containing the given point.
*
* @return null if none contain the point
*/
public Item getItemAtPos(Vec2f pos) {
for (Rect4f rect : items.keySet()) {
if (rect.contains(pos)) return items.get(rect);
}
return null;
}