public function triangle(Point $point1, Point $point2, Point $point3, Color $color)
{
if (!$point1->isInImage($this) || !$point2->isInImage($this) || !$point3->isInImage($this)) {
throw new IllegalArgumentException();
}
$this->line($point1, $point2, $this->prepareColor($color));
$this->line($point2, $point3, $this->prepareColor($color));
$this->line($point3, $point1, $this->prepareColor($color));
}
public function __destruct()
{
$this->z = NULL;
parent::__destruct();
}