4   var $ur;  variable in Rectangle
7   function Rectangle($ll, $ur) {  argument
9     $this->ur = $ur;
13     return $this->ur->x - $this->ll->x;
17     return $this->ur->y - $this->ll->y;
21     if ($this->ur->x < $this->ll->x) {
22       $x = $this->ur->x;
23       $this->ur->x = $this->ll->x;
27     if ($this->ur->y < $this->ll->y) {
28       $y = $this->ur->y;
29       $this->ur->y = $this->ll->y;