26 May 09 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.
运行截图
完整源代码(PHP-Gtk example):
<?php
/**
* A 24 maker
* @version 1.0.0
* @author laruence<laruence at yahoo.com.cn>
* @copyright (c) 2009 http://www.laruence.com
*/
class TwentyFourCal extends GtkWindow {
private $chalkboard;
private $inputs;
public $needle = 24;
public $precision = '1e-6';
function TwentyFourCal() {
parent::__construct();
$this->draw();
$this->show();
}
/**
* 画窗体方法
*/
public function draw() {
$this->set_default_size(200, 200);
$this->set_title("24计算器");
$mesg = new GtkLabel('Please input 4 integer(0-99):');
$this->chalkboard = new GtkLabel();
$this->inputs = $inputs = array(
new GtkEntry(),
new GtkEntry(),
new GtkEntry(),
new GtkEntry()
);
/**
* container
*/
$table = new GtkTable(4, 1, 0);
$layout = array(
'left' => 0,
'right' => 1,
'top' => 0,
'bottom' => 1,
);
$vBox = new GtkVBox(false, true);
$vBox->pack_start($mesg);
foreach ( $inputs as $input ) {
$input->set_max_length(2);
$table->attach($input, $layout['left'], $layout['right'],
$layout['top']++, $layout['bottom']++);
}
$vBox->pack_start($table);
$button = new GtkButton("Calculate");
$button->connect("clicked", array($this, "calculate"));
$vBox->pack_start($this->chalkboard);
$vBox->pack_start($button, true, false);
$this->add($vBox);
}
public function show() {
$this->show_all(); // 显示窗体
}
private function notice($mesg) {
$this->chalkboard->set_text($mesg);
}
/**
* 取得用户输入方法
*/
public function calculate() {
$operants = array();
$inputs = $this->inputs;
foreach ($inputs as $input) {
$number = $input->get_text();
if (!preg_match('/^\s*\d+\s*$/', $number)) {
$this->notice('pleas input for integer(0-99)');
return ;
}
array_push($operants, $number);
}
$length = count($operants);
try {
$this->search($operants, 4);
} catch (Exception $e) {
$this->notice($e->getMessage());
return;
}
$this->notice('can\'t compute!');
return;
}
/**
* 求24点算法PHP实现
*/
private function search($expressions, $level) {
if ($level == 1) {
$result = 'return ' . $expressions[0] . ';';
if ( abs(eval($result) - $this->needle) <= $this->precision) {
throw new Exception($expressions[0]);
}
}
for ($i=0;$i<$level;$i++) {
for ($j=$i+1;$j<$level;$j++) {
$expLeft = $expressions[$i];
$expRight = $expressions[$j];
$expressions[$j] = $expressions[$level - 1];
$expressions[$i] = '(' . $expLeft . ' + ' . $expRight . ')';
$this->search($expressions, $level - 1);
$expressions[$i] = '(' . $expLeft . ' * ' . $expRight . ')';
$this->search($expressions, $level - 1);
$expressions[$i] = '(' . $expLeft . ' - ' . $expRight . ')';
$this->search($expressions, $level - 1);
$expressions[$i] = '(' . $expRight . ' - ' . $expLeft . ')';
$this->search($expressions, $level - 1);
if ($expLeft != 0) {
$expressions[$i] = '(' . $expRight . ' / ' . $expLeft . ')';
$this->search($expressions, $level - 1);
}
if ($expRight != 0) {
$expressions[$i] = '(' . $expLeft . ' / ' . $expRight . ')';
$this->search($expressions, $level - 1);
}
$expressions[$i] = $expLeft;
$expressions[$j] = $expRight;
}
}
return false;
}
function __destruct() {
Gtk::main_quit();
}
}
new TwentyFourCal();
Gtk::main(); //进入GTK主循环
?>
GTK1的API Reference : http://gtk.php.net/manual/en/gtk.gtkentry.php
GTK2的API Reference: 很不完整
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