PHP实现的简单三角形、矩形周长面积计算器分享(2)

abstract class  Shape{     //形状的名称     public $name;       //形状的计算面积方法     abstract function area();       //形状的计算周长的方法     abstract function zhou();       //形状的图形表单界面     abstract function view();     //形状的验证方法     abstract function yan($arr);   }

三角形计算类文件：

class Triangle extends Shape {     private $bian1;     private $bian2;     private $bian3;       function __construct($arr = array()) {         if(!empty($arr)) {             $this->bian1 = $arr['bian1'];             $this->bian2 = $arr['bian2'];             $this->bian3 = $arr['bian3'];           }           $this->name = "三角形";     }       function area() {         $p =    ($this->bian1 + $this->bian2 + $this->bian3)/2;           return sqrt($p*($p-$this->bian1)*($p-$this->bian2)*($p-$this->bian3));     }       function zhou() {         return $this->bian1 + $this->bian2 + $this->bian3;     }       function view() {         $form = '<form action="index.php?action=triangle" method="post">';         $form .= $this->name.'第一个边:<input type="text" value="'.$_POST['bian1'].'" /><br>';         $form .= $this->name.'第二个边:<input type="text" value="'.$_POST['bian2'].'" /><br>';         $form .= $this->name.'第三个边:<input type="text" value="'.$_POST['bian3'].'" /><br>';         $form .= '<input type="submit" value="计算"><br>';         $form .='<form>';         echo $form;     }       function yan($arr) {         $bj = true;         if($arr['bian1'] < 0) {             echo "第一个边不能小于0!<br>";             $bj = false;         }           if($arr['bian2'] < 0) {             echo "第二个边不能小于0!<br>";             $bj = false;         }           if($arr['bian3'] < 0) {             echo "第三个边不能小于0!<br>";             $bj = false;         }           if(($arr['bian1']+$arr['bian2'] < $arr['bian3']) || ($arr['bian1'] + $arr['bian3'] < $arr['bian2']) || ($arr['bian2']+$arr['bian3'] < $arr['bian1'])) {             echo "两边之和必须大于第三个边";             $bj = false;         }           return $bj;     } }

矩形计算类文件：

class Rect extends Shape {     private $width;     private $height;       function __construct($arr=array()) {           if(!empty($arr)) {             $this->width = $arr['width'];             $this->height = $arr['height'];         }         $this->name = "矩形";     }       function area() {         return $this->width * $this->height;     }       function zhou() {         return 2*($this->width + $this->height);     }       function view() {         $form = '<form action="index.php?action=rect" method="post">';         $form .= $this->name.'的宽:<input type="text" value="'.$_POST['width'].'" /><br>';         $form .= $this->name.'的高:<input type="text" value="'.$_POST['height'].'" /><br>';         $form .= '<input type="submit" value="计算"><br>';         $form .='<form>';         echo $form;     }       function yan($arr) {         $bg = true;         if($arr['width'] < 0) {             echo $this->name."的宽不能小于0!<br>";             $bg = false;            }           if($arr['height'] < 0) {             echo $this->name."的高度不能小于0!<br>";             $bg = false;         }           return $bg;     }   }

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