php中实现矩阵的碰撞检测

<?phpclass Rect{private $x;private $y;private $width;private $height;function __construct($x,$y,$width,$height){$this->x = $x;$this->y = $y;$this->width = $width;$this->height = $height;}function panDuan($px,$py){$x1 = $this->x;$x2 = $this->x+$this->width;$y1 = $this->y;$y2 = $this->y+$this->height;if (($px>=$x1) && ($px<=$x2) && ($py>=$y1) && ($py<= $y2)) {echo "in";}else{echo "over";}}function rectArc($dx1,$dx2){//第一个矩形的左上角的x，y，width，height；$x1 = $dx1->x;$y1 = $dx1->y;$w1 = $dx1->width;$h1 = $dx1->height;//第二个矩形的左上角的x，y，width，height；$x2 = $dx2->x;$y2 = $dx2->y;$w2 = $dx2->width;$h2 = $dx2->height;//两个矩形的宽度的一半$heng = $w1/2+$w2/2;//两个矩形的高度的一半$shu = $h1/2+$h2/2;//第一个矩形的中心的x，y值$jxx1 = $x1+$w1/2;$jxy1 = $y1+$h1/2;//第二个矩形的中心的x，y值$jxx2 = $x2+$w2/2;$jxy2 = $y2+$h2/2;//判断是否横碰撞$bool1 = abs($jxx1-$jxx2)<=$heng;//判断是否竖碰撞$bool2 = abs($jxy1-$jxy2)<=$shu;if ($bool1&&$bool2) {echo "碰撞";}else{echo "不碰撞";}}}$r1 = new Rect(1,1,2,2);$r2 = new Rect(4,4,1,1);$r1->rectArc($r1,$r2);?>