PHP+Gtk实例(求24点)

• 作者: Laruence(   )
• 本文地址: http://www.laruence.com/2009/05/26/871.html
• 转载请注明出处

最近要安排我为BIT提供的《PHP高级应用–关于PHP你不知道的》一门课的讲课素材, 其中有部分涉及到PHP和Gtk2开发桌面应用的部分, 于是抽空就想写一了一个demo出来.

这是一个经典的求24的算法的PHP实现, 加上了Gtk2的界面, 其实也没什么复杂的, 和MFC开发没什么太大的区别， 唯一的不爽， 就是要自己用代码来写布局。。。

有兴趣的同学可以看看.

后记: 这里有一个网页版的, 可以用来玩玩: http://www.laruence.com/stashes/compute.php

运行截图

完整源代码(PHP-Gtk example):

1.   <?php
2. /**
3. * A 24 maker
4. * @version 1.0.0
5. * @author laruence<laruence at yahoo.com.cn>
6. * @copyright (c) 2009 http://www.laruence.com
7. */
8.  
9. class TwentyFourCal extends GtkWindow {
10.      private $chalkboard;
11.      private $inputs;
12.      public $needle = 24;
13.      public $precision = '1e-6';
14.  
15.      function TwentyFourCal() {
16.           parent::__construct();
17.           $this->draw();
18.           $this->show();
19.      }
20.  
21.      /**
22.       * 画窗体方法
23.       */
24.      public function draw() {
25.           $this->set_default_size(200, 200);
26.           $this->set_title("24计算器");
27.  
28.           $mesg = new GtkLabel('Please input 4 integer(0-99):');
29.           $this->chalkboard = new GtkLabel();
30.  
31.           $this->inputs = $inputs = array(
32.                new GtkEntry(),
33.                new GtkEntry(),
34.                new GtkEntry(),
35.                new GtkEntry()
36.           );
37.  
38.           /**
39.            * container
40.            */
41.           $table = new GtkTable(4, 1, 0);
42.           $layout = array(
43.                'left' => 0,
44.                'right' => 1,
45.                'top'     => 0,
46.                'bottom' => 1,
47.           );
48.  
49.           $vBox = new GtkVBox(false, true);
50.           $vBox->pack_start($mesg);
51.  
52.           foreach ( $inputs as $input ) {
53.                $input->set_max_length(2);
54.                $table->attach($input, $layout['left'], $layout['right'],
55.                     $layout['top']++, $layout['bottom']++);
56.           }
57.  
58.           $vBox->pack_start($table);
59.           $button = new GtkButton("Calculate");
60.           $button->connect("clicked", array($this, "calculate"));
61.           $vBox->pack_start($this->chalkboard);
62.           $vBox->pack_start($button, true, false);
63.  
64.           $this->add($vBox);
65.      }
66.  
67.      public function show() {
68.           $this->show_all(); // 显示窗体
69.      }
70.  
71.      private function notice($mesg) {
72.           $this->chalkboard->set_text($mesg);
73.      }
74.  
75.      /**
76.       * 取得用户输入方法
77.       */
78.      public function calculate() {
79.           $operants = array();
80.           $inputs = $this->inputs;
81.           foreach ($inputs as $input) {
82.                $number = $input->get_text();
83.                if (!preg_match('/^\s*\d+\s*$/', $number)) {
84.                     $this->notice('pleas input for integer(0-99)');
85.                     return ;
86.                }
87.                array_push($operants, $number);
88.           }
89.           $length = count($operants);
90.           try {
91.                $this->search($operants, 4);
92.           } catch (Exception $e) {
93.                $this->notice($e->getMessage());
94.                return;
95.           }
96.           $this->notice('can\'t compute!');
97.           return;
98.      }
99.  
100.      /**
101.       * 求24点算法PHP实现
102.       */
103.      private function search($expressions, $level) {
104.           if ($level == 1) {
105.                $result = 'return ' . $expressions[0] . ';';
106.                if ( abs(eval($result) - $this->needle) <= $this->precision) {
107.                     throw new Exception($expressions[0]);
108.                }
109.           }
110.           for ($i=0;$i<$level;$i++) {
111.                for ($j=$i+1;$j<$level;$j++) {
112.                     $expLeft = $expressions[$i];
113.                     $expRight = $expressions[$j];
114.                     $expressions[$j] = $expressions[$level - 1];
115.  
116.                     $expressions[$i] = '(' . $expLeft . ' + ' . $expRight . ')';
117.                     $this->search($expressions, $level - 1);
118.  
119.                     $expressions[$i] = '(' . $expLeft . ' * ' . $expRight . ')';
120.                     $this->search($expressions, $level - 1);
121.  
122.                     $expressions[$i] = '(' . $expLeft . ' - ' . $expRight . ')';
123.                     $this->search($expressions, $level - 1);
124.  
125.                     $expressions[$i] = '(' . $expRight . ' - ' . $expLeft . ')';
126.                     $this->search($expressions, $level - 1);
127.  
128.                     if ($expLeft != 0) {
129.                          $expressions[$i] = '(' . $expRight . ' / ' . $expLeft . ')';
130.                          $this->search($expressions, $level - 1);
131.                     }
132.  
133.                     if ($expRight != 0) {
134.                          $expressions[$i] = '(' . $expLeft . ' / ' . $expRight . ')';
135.                          $this->search($expressions, $level - 1);
136.                     }
137.                     $expressions[$i] = $expLeft;
138.                     $expressions[$j] = $expRight;
139.                }
140.           }
141.           return false;
142.      }
143.  
144.      function __destruct() {
145.           Gtk::main_quit();
146.      }
147. }
148.  
149. new TwentyFourCal();
150. Gtk::main(); //进入GTK主循环
151. ?>

 

GTK1的API Reference : http://gtk.php.net/manual/en/gtk.gtkentry.php

GTK2的API Reference: 很不完整