- width = std::max (x + width, other.x + other.width) - x;
- height = std::max (y + height, other.y + other.height) - y;
+ width = std::max (old_x + width, other.x + other.width) - x;
+ height = std::max (old_y + height, other.y + other.height) - y;
+ }
+
+ Rect<T> extended (T amount) const {
+ Rect<T> c = *this;
+ c.x -= amount;
+ c.y -= amount;
+ c.width += amount * 2;
+ c.height += amount * 2;
+ return c;