基础·AS3下的基本游戏框架之一

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文章标签：

#游戏 #框架 #function #import #class

技术·AS2/AS3·Game&Cartoon 专栏收录该内容

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本文介绍了一个简单的游戏状态管理及事件处理机制实现案例。通过状态循环、游戏频率设定及事件模型来控制游戏的不同阶段，如初始化、进行中和结束等状态。利用ActionScript 3.0展示了如何响应用户的点击事件并更新游戏状态。

三个重点：状态循环、游戏频率、事件模型。

//状态循环

public function gameLoop(e:Event):void{

switch(gameState){

case STATE_INIT: initGame();

break;

case STATE_PLAY: playGame();

break;

case STATE_GAME_OVER: endGame();

break;

}

//游戏频率，注意ENTER_FRAME 关键是“帧频”

public function Game(){ //类Game的构造函数

addEventListener(Event.ENTER_FRAME,gameLoop);

gameState = STATE_INIT;

}

//事件模型

public function initGame():void{

stage.addEventListener(MouseEvent.CLICK,onMouseEventHandler);

clicks=0;

gameState = STATE_PLAY;

}

public function playGame(){

if(clicks>=10){

gameState = STATE_GAME_OVER;

}

public function onMouseEventHandler(e:MouseEvent){

clicks++;

}

完整的示例代码如下：

package{ import flash.display.MovieClip; import flash.events.Event; import flash.events.MouseEvent; public class Game extends MovieClip{ public static const STATE_INIT:int = 10; public static const STATE_PLAY:int = 20; public static const STATE_GAME_OVER:int = 30; public var gameState:int = 0; public var clicks:int = 0; public function Game(){ addEventListener(Event.ENTER_FRAME,gameLoop); gameState = STATE_INIT; } public function gameLoop(e:Event):void{ switch(gameState){ case STATE_INIT: initGame(); break; case STATE_PLAY: playGame(); break; case SATE_GAME_OVER: endGame(); break; } } public function initGame():void{ stage.addEventListener(MouseEvent.CLICK,onMouseClickEventHandler); clicks = 0; gameState = STATE_PLAY; } public function onMouseClickEventHandler(e:MouseEvent){ clicks++; } public function playGame():void{ if(clicks>=10){ gameState = STATE_GAME_OVER; } } public function endGame():void{ stage.removeEventListener(MouseEvent.CLICK,onMouseClickEventHandler); gameState = STATE_INIT; trace("game over"); } } }