index.php页面：
<html>
<head>
<title>图形计算器（面向对象）</title>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
</head>
<body>
<center>
<h1>图形（面积 && 周长)计算器）<h1>
<a href="index.php?action=rect">矩形</a>||
<a href="index.php?action=triangle">三角形</a>||
<a href="index.php?action=circle">圆形</a>
<hr>
</center>
<?php
error_reporting(E_ALL & ~E_NOTICE);
function _autoload($className)
{
include strtolower($className).".class.php";
}
echo new Form();
if(isset($_POST["sub"])){
echo new Result();
}
?>
</body>
</html>
form.class.php页面:
<?php
class Form{
private $action;
private $shape;
function _construct($action="index.php"){
$this->action = $action;
$this->shape = isset($_REQUEST["action"]) ? $_REQUEST["action"]:"rect";
}
function _toString(){
$form='<form action="'.$this->action.'" method="post">';
switch($this->shape){
case"rect":
$form.=$this->getRect();
break;
case"triangle":
$form.=$this->getTriangle();
break;
case"circle":
$form.=$this->getcircle();
break;
default:
$form.='请选择一个形状';
}
$form.='<input type="submit" name="sub" value="计算">';
$form.='</form>';
return $form;
}
private function getRect(){
$input='<b>请输入|矩形|的长和宽：</b><p>';
$input.='宽度：<input type="text" name="width" value="'.$_POST['width'].'"><br>';
$input.='高度：<input type="test" name="height" value="'.$_POST['height'].'"><br>';
$input.='<input type="hidden" name="action" value="rect">';
return $input;
}
private function getTriangle(){
$input='<b>请输入|三角形|的三边：</b><p>';
$input='<b>请输入|三角形|的三边：</b><p>';
$input.='第一边：<input type="text" name="side1" value="'.$_POST['side1'].'"><br>';
$input.='第二边：<input type="test" name="side2" value="'.$_POST['side2'].'"><br>';
$input.='第三边：<input type="test" name="side3" value="'.$_POST['side3'].'"><br>';
$input.='<input type="hidden" name="action" value="triangle">';
return $input;
}
private function getCircle(){
$input='<b>请输入|圆形|的半径：</b><p>';
$input.='半径：<input type="text" name="radius" value="'.$_POST['radius'].'"><br>';
$input.='<input type="hidden" name="action" value="circle">';
return $input;
}
}
?>
shape.php页面：
<?php
abstract class shape{
public $shapeName;
abstract function area();
abstract function perimeter();
protected function validate($value,$message="形状"){
if($value == "" ||!is_numeric($value)||$value < 0){
echo '<font color="red">'.$message.'必须为非负值的数>字，并且不能为空</font><br>';
return false;
} else{
return true;
}
}
}
?>
Rect.php页面<?php
class Rect extends Shape{
private $width=0;
private $height=0;
function _construct(){
$this->shapeName="矩形";
if($this->validate($_POST["width"],'矩形的宽度') & $this->validate($_POST["height"],'矩形的高度'))
{
$this->width=$_POST["width"];
$this->height=$_POST["height"];
}else{exit;}
$this->width=$_POST["width"];
$this->height=$_POST["height"];
}
function area(){
return $this->width*$this->height;
}
function perimeter(){
return 2*($this->width+$this->height);
Triangle.php页面：
<?php
class Triangle extends Shape{
private $side1=0;
private $side2=0;
private $side3=0;
function _construct(){
if($this->validate($_POST['side1'],'三角形的第一边')){
$this->side1=$_POST["side1"];
if($this->validate($_POST['side2'],'三角形的第一
边')){
$this->side2=$_POST["side2"];
if($this->validate($_POST['side3'],'三角形的第一
边')){
$this->side3=$_POST["side3"];
}
$this->side1=$_POST["side1"];
$this->side2=$_POST["side2"];
$this->side3=$_POST["side3"];
}
if(!$this->validateSum()){
echo '<font color="red">三角形的两边之和必须大于第三边
</font>';
exit;
}
//海伦公式
function _area(){
$s=($this->side1+$this->side2+$this->side3)/2;
return sqrt( $s*($s-$this->side1)*($s-$this->side2)*($s-$this->side3));
}
function _perimeter(){
return $this->side1+$this->side2+$this->side3;
}
private function validateSum(){
$condition1=($this->side1+$this->side2) > $this->side3;
$condition2=($this->side1+$this->side3) > $this->side2;
$condition3=($this->side2+$this->side3) > $this->side1;
if($condition1 $$ $condition2 $$ $condition3){
return true;
} else{return false;}
}
}
Circle.php界面：
<?php
class Circle extends Shape{
private $radius=0;
function _construct(){
$this->shapeName="圆形";
if($this->validate($_POST['radius'],'圆的半径')){
$this->radius.$_POST["radius"];
}else{exit;}
$this->radius=$_POST["radius"];
}
function area(){
return pi()*$this->radius*$this->radius;
}
function perimeter(){
return 2*pi()*$this->radius;
}
}
?>