PHP实现的简单三角形、矩形周长面积计算器分享

运用PHP面向对象的知识设计一个图形计算器,同时也运用到了抽象类知识,这个计算器可以计算三角形的周长和面积以及矩形的周长和面积。本图形计算器有4个页面:1.PHP图形计算器主页index.php;    2.形状的抽象类shape.class.php;    3三角形计算类triangle.class.php;    4.矩形计算类rect.class.php。

PHP图形计算器代码点击下载:   php图形计算器.zip

代码分别如下:

PHP图形计算器主页:

<html>

    <head>

        <title>简单的图形计算器</title>

        <meta http-equiv="Content-Type" content="text/html;charset=utf-8" />

    </head>

 

    <body>

        <center>

            <h1>简单的图形计算器</h1>

 

            <a href="index.php?action=rect">矩形</a> ||

            <a href="index.php?action=triangle">三角形</a>

        </center>

 

        <hr><br>

 

    <?php

            error_reporting(E_ALL & ~E_NOTICE);

 

            //设置自动加载这个程序需要的类文件

            function __autoload($classname){

                include strtolower($classname).".class.php";

            }

 

            //判断用户是否有选择单击一个形状链接

            if(!empty($_GET['action'])) {

                //第一步:创建形状的对象

                $classname = ucfirst($_GET['action']);

 

                $shape=new $classname($_POST);

                //第二步:调用形状的对象中的界面view()

                $shape -> view();

 

                //第三步:用户是否提交了对应图形界面的表单

                if(isset($_POST['dosubmit'])) {

                    //第四步:查看用户输出的数据是否正确, 失败则提示

                    if($shape->yan($_POST)) {

                        //计算图形的周长和面积

                        echo $shape->name."的周长为:".$shape->zhou()."<br>";

                        echo $shape->name."的面积为:".$shape->area()."<br>";

                    }

                }

 

            //如果用户没有单击链接, 则是默认访问这个主程序

            }else {

                echo "请选择一个要计算的图形!<br>";

 

            }

 

        ?>

    </body>

</html>

形状的抽象类:

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 .= $this->name.'第一个边:<input type="text" name="bian1" value="'.$_POST['bian1'].'" /><br>';

        $form .= $this->name.'第二个边:<input type="text" name="bian2" value="'.$_POST['bian2'].'" /><br>';

        $form .= $this->name.'第三个边:<input type="text" name="bian3" value="'.$_POST['bian3'].'" /><br>';

        $form .= '<input type="submit" name="dosubmit" 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 .= $this->name.'的宽:<input type="text" name="width" value="'.$_POST['width'].'" /><br>';

        $form .= $this->name.'的高:<input type="text" name="height" value="'.$_POST['height'].'" /><br>';

        $form .= '<input type="submit" name="dosubmit" 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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