存档：
index.php
1 <html> 2 <head> 3 <title>图形计算器开发</title> 4 <meta http-equiv="Content-type" content="text/html;charset=utf-8"> 5 </head> 6 7 <body> 8 <center> 9 <h1>图形(周长&面积)计算器</h1> 10 11 <a href="index.php?action=rect">矩形</a> 12 <a href="index.php?action=triangle">三角形</a> 13 <a href="index.php?action=circle">圆形</a> 14 </center> 15 <?php 16 error_reporting(E_ALL & ~E_NOTICE); 17 function __autoload($className){ 18 include strtolower($className).".class.php"; 19 } 20 echo new Form("index.php"); 21 if(isset($_POST["sub"])){ 22 echo new Result(); 23 } 24 ?> 25 </body> 26 </html>
form.class.php
1 <?php 2 class Form{ 3 private $action; 4 private $shape; 5 function __construct($action=""){ 6 $this->action = $action; 7 $this->shape = isset($_GET["action"])?$_GET["action"]:"rect"; 8 } 9 10 function __toString(){ 11 $form='<form action="'.$this->action.'?action='.$this->shape.'" method="post">'; 12 $shape="get".ucfirst($this->shape); 13 $form .=$this->$shape(); 14 $form .='<br><input type="submit" name="sub" value="计算"><br>'; 15 $form .='</form>'; 16 return $form; 17 } 18 19 private function getRect(){ 20 $input = '<b>请输入|矩形|的宽度和高度:</b><p>'; 21 $input .= '宽度:<input type="text" name="width" value="'.$_POST["width"].'"><br>'; 22 $input .= '高度:<input type="text" name="height" value="'.$_POST["height"].'"><br>'; 23 return $input; 24 } 25 26 private function getTriangle(){ 27 $input = '<b>请输入|三角形|的三条边:</b><p>'; 28 $input .= '第一条边:<input type="text" name="side1" value="'.$_POST["side1"].'"><br>'; 29 $input .= '第二条边:<input type="text" name="side2" value="'.$_POST["side2"].'"><br>'; 30 $input .= '第三条边:<input type="text" name="side3" value="'.$_POST["side3"].'"><br>'; 31 return $input; 32 } 33 34 private function getCircle(){ 35 $input = '<b>请输入|圆形|的半径:</b><p>'; 36 $input .= '半径:<input type="text" name="radius" value="'.$_POST["radius"].'"><br>'; 37 return $input; 38 } 39 } 40 ?>
shape.class.php
1 <?php 2 abstract class Shape{ 3 public $shapeName; 4 abstract function area(); 5 abstract function perimeter(); 6 protected function validate($value,$message = '输入的值'){ 7 if($value=="" || !is_numeric($value) || $value<0){ 8 $message=$this->shapeName.$message; 9 echo '<font color="red">'.$message.'必须为非负值的数字,并且不能为空</font><br>'; 10 return false; 11 } 12 else{ 13 return true; 14 } 15 } 16 } 17 ?>
result.class.php
1 <?php 2 class Result{ 3 private $shape = null; 4 function __construct(){ 5 $this->shape = new $_GET['action'](); 6 } 7 8 function __toString(){ 9 $result = $this->shape->shapeName.'的周长:'.round($this->shape->perimeter(),2).'<br>'; 10 $result .= $this->shape->shapeName.'的面积:'.round($this->shape->area(),2).'<br>'; 11 return $result; 12 } 13 } 14 ?>
rect.class.php
1 <?php 2 class Rect extends Shape{ 3 private $width = 0; 4 private $height = 0; 5 function __construct(){ 6 $this->shapeName = "矩形"; 7 if($this->validate($_POST["width"],"宽度") & $this->validate($_POST["height"],"高度")){ 8 $this->width = $_POST["width"]; 9 $this->height = $_POST["height"]; 10 } 11 } 12 13 function area(){ 14 return $this->width*$this->height; 15 } 16 17 function perimeter(){ 18 return 2*($this->width+$this->height); 19 } 20 } 21 ?>
triangle.class.php
1 <?php 2 class Triangle extends Shape{ 3 private $side1 = 0; 4 private $side2 = 0; 5 private $side3 = 0; 6 function __construct(){ 7 $this->shapeName = "三角形"; 8 if($this->validate($_POST["side1"],"第一条边") & 9 $this->validate($_POST["side2"],"第二条边") & 10 $this->validate($_POST["side3"],"第三条边")){ 11 if($this->validateSum($_POST["side1"],$_POST["side2"],$_POST["side3"])){ 12 $this->side1 = $_POST["side1"]; 13 $this->side2 = $_POST["side2"]; 14 $this->side3 = $_POST["side3"]; 15 } 16 else{ 17 echo '<font color="red">三角形的两边之和要大于第三边</font><br>'; 18 } 19 } 20 } 21 22 function area(){ 23 $s = ($this->side1+$this->side2+$this->side3)/2; 24 return sqrt($s*($s-$this->side1)*($s-$this->side2)*($s-$this->side3)); 25 } 26 27 function perimeter(){ 28 return $this->side1+$this->side2+$this->side3; 29 } 30 31 private function validateSum($s1,$s2,$s3){ 32 if((($s1+$s2)>$s3) && (($s1+$s3)>$s2) && (($s2+$s3)>$s1)){ 33 return true; 34 } 35 else{ 36 return false; 37 } 38 } 39 } 40 ?>
circle.class.php
1 <?php 2 class Circle extends Shape{ 3 private $radius = 0; 4 function __construct(){ 5 $this->shapeName = "图形"; 6 if($this->validate($_POST['radius'],'半径')){ 7 $this->radius = $_POST['radius']; 8 } 9 } 10 11 function area(){ 12 return pi()*$this->radius*$this->radius; 13 } 14 15 function perimeter(){ 16 return 2*pi()*$this->radius; 17 } 18 } 19 ?>
结果如下：
