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php实现图形计算器

2018-01-30 17:56 162 查看
存档：

index.php

<html>
<head>
<title>图形计算器开发</title>
<meta http-equiv="Content-type" content="text/html;charset=utf-8">
</head>

<body>
<center>
<h1>图形(周长&面积)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>
</center>
<?php
error_reporting(E_ALL & ~E_NOTICE);
function __autoload($className){
include strtolower($className).".class.php";
}
echo new Form("index.php");
if(isset($_POST["sub"])){
echo new Result();
}
?>
</body>
</html>


form.class.php

<?php
class Form{
private $action;
private $shape;
function __construct($action=""){
$this->action = $action;
$this->shape = isset($_GET["action"])?$_GET["action"]:"rect";
}

function __toString(){
$form='<form action="'.$this->action.'?action='.$this->shape.'" method="post">';
$shape="get".ucfirst($this->shape);
$form .=$this->$shape();
$form .='<br><input type="submit" name="sub" value="计算"><br>';
$form .='</form>';
return $form;
}

private function getRect(){
$input = '<b>请输入|矩形|的宽度和高度:</b><p>';
$input .= '宽度:<input type="text" name="width" value="'.$_POST["width"].'"><br>';
$input .= '高度:<input type="text" name="height" value="'.$_POST["height"].'"><br>';
return $input;
}

private function getTriangle(){
$input = '<b>请输入|三角形|的三条边:</b><p>';
$input .= '第一条边:<input type="text" name="side1" value="'.$_POST["side1"].'"><br>';
$input .= '第二条边:<input type="text" name="side2" value="'.$_POST["side2"].'"><br>';
$input .= '第三条边:<input type="text" name="side3" value="'.$_POST["side3"].'"><br>';
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>';
return $input;
}
}
?>


shape.class.php

<?php
abstract class Shape{
public $shapeName;
abstract function area();
abstract function perimeter();
protected function validate($value,$message = '输入的值'){
if($value=="" || !is_numeric($value) || $value<0){
$message=$this->shapeName.$message;
echo '<font color="red">'.$message.'必须为非负值的数字,并且不能为空</font><br>';
return false;
}
else{
return true;
}
}
}
?>


result.class.php

<?php
class Result{
private $shape = null;
function __construct(){
$this->shape = new $_GET['action']();
}

function __toString(){
$result = $this->shape->shapeName.'的周长:'.round($this->shape->perimeter(),2).'<br>';
$result .= $this->shape->shapeName.'的面积:'.round($this->shape->area(),2).'<br>';
return $result;
}
}
?>


rect.class.php

<?php
class Rect extends Shape{
private $width = 0;
private $height = 0;
function __construct(){
$this->shapeName = "矩形";
if($this->validate($_POST["width"],"宽度") & $this->validate($_POST["height"],"高度")){
$this->width = $_POST["width"];
$this->height = $_POST["height"];
}
}

function area(){
return $this->width*$this->height;
}

function perimeter(){
return 2*($this->width+$this->height);
}
}
?>


triangle.class.php

<?php
class Triangle extends Shape{
private $side1 = 0;
private $side2 = 0;
private $side3 = 0;
function __construct(){
$this->shapeName = "三角形";
if($this->validate($_POST["side1"],"第一条边") &
$this->validate($_POST["side2"],"第二条边") &
$this->validate($_POST["side3"],"第三条边")){
if($this->validateSum($_POST["side1"],$_POST["side2"],$_POST["side3"])){
$this->side1 = $_POST["side1"];
$this->side2 = $_POST["side2"];
$this->side3 = $_POST["side3"];
}
else{
echo '<font color="red">三角形的两边之和要大于第三边</font><br>';
}
}
}

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($s1,$s2,$s3){
if((($s1+$s2)>$s3) && (($s1+$s3)>$s2) && (($s2+$s3)>$s1)){
return true;
}
else{
return false;
}
}
}
?>


circle.class.php

<?php
class Circle extends Shape{
private $radius = 0;
function __construct(){
$this->shapeName = "图形";
if($this->validate($_POST['radius'],'半径')){
$this->radius = $_POST['radius'];
}
}

function area(){
return pi()*$this->radius*$this->radius;
}

function perimeter(){
return 2*pi()*$this->radius;
}
}
?>


结果如下：





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