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利用PHP編寫(xiě)一個(gè)簡(jiǎn)易的圖形計(jì)算器?針對(duì)這個(gè)問(wèn)題,這篇文章詳細(xì)介紹了相對(duì)應(yīng)的分析和解答,希望可以幫助更多想解決這個(gè)問(wèn)題的小伙伴找到更簡(jiǎn)單易行的方法。
主函數(shù):index.php
<!doctype html> <html> <head> <meta charset="utf-8"> <title>圖形計(jì)算器</title> <style> * { margin: 0px; padding: 0px; } #contains { width: 500px; margin: 20px auto; background: #0C0; text-align: center; } h2 { width: 500px; height: 60px; } a { font-size: 20px; text-decoration: none; } #footer { width: 300px; background: #fff; margin: 0 auto; padding: 5px 10px; border-radius: 150px; } </style> </head> <body> <div id="contains"> <h2>簡(jiǎn)易圖形計(jì)算器</h2> <a href='index.php?action=rect'>矩形</a> | <a href='index.php?action=triangle'>三角形</a>| <a href='index.php?action=cirle'>圓形</a> <hr> <?php ini_set("display_errors", "On"); //開(kāi)啟錯(cuò)誤調(diào)試 //設(shè)置錯(cuò)誤報(bào)告的級(jí)別,除了無(wú)關(guān)緊要的'注意',其他的報(bào)告都輸出 error_reporting(E_ALL & ~E_NOTICE); function __autoload($classname) { //魔術(shù)方法 自動(dòng)加載類 include strtolower($classname).".class.php"; //將類名轉(zhuǎn)化成小寫(xiě) } // include "shape.class.php"; // include "rect.class.php"; if (!empty($_GET['action'])) { // echo "傳送成功"; $classname = ucfirst($_GET['action']); $shape = new $classname($_POST); $shape->view($_POST); if (isset($_POST['sub'])) { echo "<div id='footer'>"; if ($shape->yan($_POST)) { echo "<b>".$shape->name."的周長(zhǎng)".$shape->zhou()."</b>"."<br>"; echo "<br>"; echo "<b>".$shape->name."的面積".$shape->area()."</b>"."<br>"; }else { echo "<b>錯(cuò)誤:$shape->error</b>"; } echo "</div>"; } } else { echo "請(qǐng)選擇一個(gè)圖形"; } ?> </div> </body> </html>
先定義一個(gè)抽象類
<?php abstract class Shape { private $name; private $error; abstract function area(); abstract function zhou(); abstract function view($arr); abstract function yan($arr); } ?>
矩形類的編寫(xiě)
<?php 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"; $this->error = ''; } function area() { return $this->width * $this->height; } function zhou() { return ($this->width+$this->height) * 2; } function view($arr) { $form .= "<form action='index.php?action=rect' method='post'>"; $form .= "請(qǐng)輸入".$arr['name']."的寬度:<input type='text' name='width' value='".$_POST['width']."'/><br>"; $form .= "<br>"; $form .= "請(qǐng)輸入".$arr['name']."的長(zhǎng)度:<input type='text' name='height' value='".$_POST['height']."'/><br>"; $form .= "<br>"; $form .= "<input type='submit' name='sub' value='提交'/> "; $form .= "<input type='reset' name='ret' value='重置'/>"; $form .= "</form>"; echo $form; } function yan($arr) { $bz = true; if ($arr['width']< 0) { $this->error .= "寬度小于0;"; $bz = false; } else { if (!is_numeric($arr['width'])) { $this->error .= "寬不是數(shù)字;"; $bz = false; } } if ($arr['height']< 0) { $this->error .= "寬度小于0;"; $bz = false; } else { if (!is_numeric($arr['height'])) { $this->error .= "高不是數(shù)字;"; $bz = false; } } return $bz; } } ?>
三角形類:
<?php 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"; $this->error = ''; } function area() { $p = ($this->bian1 + $this->bian2 + $this->bian3) / 2; // p(p-a)(p-b)(p-c) return sqrt($p*($p-$this->bian1)*($p-$this->bian2)*($p-$this->bian3)); } function zhou() { return $this->bian1+$this->bian2+$this->bian3; } function view($arr) { $form .= "<form action='index.php?action=triangle' method='post'>"; $form .= "請(qǐng)輸入".$arr['name']."的第一條邊:<input type='text' name='bian1' value='".$_POST['bian1']."'/><br>"; $form .= "<br>"; $form .= "請(qǐng)輸入".$arr['name']."的第二條邊:<input type='text' name='bian2' value='".$_POST['bian2']."'/><br>"; $form .= "<br>"; $form .= "請(qǐng)輸入".$arr['name']."的第三條邊:<input type='text' name='bian3' value='".$_POST['bian3']."'/><br>"; $form .= "<br>"; $form .= "<input type='submit' name='sub' value='提交'/> "; $form .= "<input type='reset' name='ret' value='重置'/>"; $form .= "</form>"; echo $form; } function yan($arr) { $bz = true; if ($arr['bian1']< 0) { $this->error .= "第一條邊小于0;"; $bz = false; } else { if (!is_numeric($arr['bian1'])) { $this->error .= "第一條邊不是數(shù)字;"; $bz = false; } } if ($arr['bian2']< 0) { $this->error .= "第二條邊小0;"; $bz = false; } else { if (!is_numeric($arr['bian2'])) { $this->error .= "第二條邊不是數(shù)字;"; $bz = false; } } if ($arr['bian2']< 0) { $this->error .= "第三條邊小于0;"; $bz = false; } else { if (!is_numeric($arr['bian2'])) { $this->error .= "第三條邊不是數(shù)字;"; $bz = false; } } if (($this->bian1+$this->bian2) < $this->bian3 ||($this->bian1+$this->bian3) < $this->bian2 ||($this->bian2+$this->bian3) < $this->bian1) { $this->error .= "三條邊不能構(gòu)成三角形"; $bz = false; } return $bz; } } ?>
其他的類只要按照上面的格式改下就很好寫(xiě)出來(lái)了。
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