Flash AS3.0实例教程：教你射击类游戏的制作及解析

importflash.events.MouseEvent;
s();
startButton.addEventListener(MouseEvent.CLICK,clickStart);
functionclickStart(event:MouseEvent){
gotoAndS("play");
}

s();
startAirRaid();

playAgainButton.addEventListener(MouseEvent.CLICK,clickPlayAgain);
functionclickPlayAgain(event:MouseEvent){
gotoAndS("play");
}

parent.removeChild(this);
s();

package {
import flash.display.MovieClip;;
import flash.display.SimpleButton;
import flash.events.KeyboardEvent;
import flash.utils.Timer;
import flash.events.TimerEvent;
import flash.text.TextField;
import flash.events.Event;
public class AirRaid extends MovieClip {
private var aagun:AAGun;//火炮
private var airplanes:Array;//飞机数组
private var bullets:Array;//子弹数组
public var leftArrow, rightArrow:Boolean;
private var nextPlane:Timer;//不定时生成飞机的计时器
private var shotsLeft:int;//得分文本
private var shotsHit:int;//子弹数文本
public function startAirRaid() {
// 初始化得分数和子弹数
shotsLeft = 20;
shotsHit = 0;
showGameScore();
// 生成炮加入到舞台上
aagun = new AAGun();
addChild(aagun);
// 生成飞机、子弹数组
airplanes = new Array();
bullets = new Array();
// 键盘按下、释放事件侦听器
stage.addEventListener(KeyboardEvent.KEY_DOWN,keyDownFunction);
stage.addEventListener(KeyboardEvent.KEY_UP,keyUpFunction);
// 进入帧事件侦听器，检测子弹击中飞机的碰撞检测。
addEventListener(Event.ENTER_FRAME,checkForHits);
// 生成下一架飞机
setNextPlane();
}
//不定时生成飞机
public function setNextPlane() {
//1000毫秒至2000毫秒之间生成一架飞机
nextPlane = new Timer(1000 + Math.random() 1000,1);
//
nextPlane.addEventListener(TimerEvent.TIMER_COMPLETE,newPlane);
nextPlane.start();
}
public function newPlane(event:TimerEvent) {
// 随机的边、速度和高度
if (Math.random() > .5) {
var side:String = "left";
} else {
side = "right";
}
var altitude:Number = Math.random()50+20;
var speed:Number = Math.random()150+150;
// 生成飞机
var p:Airplane = new Airplane(side,speed,altitude);
addChild(p);
airplanes.push(p);
// set time for next plane
setNextPlane();
}
// 碰撞检测
public function checkForHits(event:Event) {
for(var bulletNum:int=bullets.length-1;bulletNum>=0;bulletNum--){
for (var airplaneNum:int=airplanes.length-1;airplaneNum>=0;airplaneNum--) {
if (bullets[bulletNum].hitTestObject(airplanes[airplaneNum])) {
airplanes[airplaneNum].planeHit();
bullets[bulletNum].deleteBullet();
shotsHit++;
showGameScore();
break;
}
}
}
if ((shotsLeft == 0) && (bullets.length == 0)) {
endGame();
}
}
// 按下键盘
public function keyDownFunction(event:KeyboardEvent) {
if (event.keyCode == 37) {
leftArrow = true;
} else if (event.keyCode == 39) {
rightArrow = true;
} else if (event.keyCode == 32) {
fireBullet();
}
}
// 释放键盘
public function keyUpFunction(event:KeyboardEvent) {
if (event.keyCode == 37) {
leftArrow = false;
} else if (event.keyCode == 39) {
rightArrow = false;
}
}
// 生成新的子弹
public function fireBullet() {
if (shotsLeft <= 0) return;
var b:Bullet = new Bullet(aagun.x,aagun.y,-300);
addChild(b);
bullets.push(b);
shotsLeft--;
showGameScore();
}
public function showGameScore() {
showScore.text = String("得分: "+shotsHit);
showShots.text = String("剩余子弹: "+shotsLeft);
}
// 从数组获取飞机
public function removePlane(plane:Airplane) {
for(var i in airplanes) {
if (airplanes[i] == plane) {
airplanes.splice(i,1);
break;
}
}
}
// 获取数组的一个子弹
public function removeBullet(bullet:Bullet) {
for(var i in bullets) {
if (bullets[i] == bullet) {
bullets.splice(i,1);
break;
}
}
}
// 游戏结束，移除界面上的东西。
public function endGame() {
// 移除飞机
for(var i:int=airplanes.length-1;i>=0;i--) {
airplanes[i].deletePlane();
}
airplanes = null;
aagun.deleteGun();
aagun = null;
// 移除侦听器
stage.removeEventListener(KeyboardEvent.KEY_DOWN,keyDownFunction);
stage.removeEventListener(KeyboardEvent.KEY_UP,keyUpFunction);
removeEventListener(Event.ENTER_FRAME,checkForHits);
nextPlane.s();
nextPlane = null;
gotoAndS("gameover");
}
}
}

package {
import flash.display.;
import flash.events.;
import flash.utils.getTimer;
public class AAGun extends MovieClip {
static const speed:Number = 150.0;
private var lastTime:int; // 控制移动的Timer
public function AAGun() {
// 枪的初始位置
this.x = 275;
this.y = 340;
//运动
addEventListener(Event.ENTER_FRAME,moveGun);
}
public function moveGun(event:Event) {
// 得到时差
var timePassed:int = getTimer() - lastTime;
lastTime += timePassed;
// 现在的位置
var newx = this.x;
// 移动到左边
if (MovieClip(parent).leftArrow) {
newx -= speedtimePassed / 1000;
}
// 移动到右边
if (MovieClip(parent).rightArrow) {
newx += speedtimePassed / 1000;
}
// 检测边界
if (newx < 10) newx = 10;
if (newx > 540) newx = 540;
// 更新位置
this.x = newx;
}
// 移除屏幕上的炮和事件
public function deleteGun() {
parent.removeChild(this);
removeEventListener(Event.ENTER_FRAME,moveGun);
}
}
}

package {
import flash.display.MovieClip;
import flash.events.TimerEvent;
import flash.utils.Timer;
import flash.utils.getTimer;
import flash.events.Event;
public class Airplane extends MovieClip {
private var dx:Number; // 飞机的速度、方向
private var lastTime:int; // 控制移动的Timer
//左右移动
public function Airplane(side:String, speed:Number, altitude:Number) {
if (side == "left") {
this.x = -50; // start to the left
dx = speed; // fly left to right
this.scaleX = -1; // reverse
} else if (side == "right") {
this.x = 600; // start to the right
dx = -speed; // fly right to left
this.scaleX = 1; // not reverse
}
this.y = altitude; // vertical position
this.gotoAndS(Math.floor(Math.random()5+1));
// set up animation
addEventListener(Event.ENTER_FRAME,movePlane);
lastTime = getTimer();
}
//检测边界
public function movePlane(event:Event) {
// get time passed
var timePassed:int = getTimer()-lastTime;
lastTime += timePassed;
// move plane
this.x += dxtimePassed/1000;
// check to see if off screen
if ((dx < 0) && (x < -50)) {
deletePlane();
} else if ((dx > 0) && (x > 600)) {
deletePlane();
}
}
// 检测碰撞，子弹击中飞机跳转到帧标签"explode"演示爆炸动画。
public function planeHit() {
removeEventListener(Event.ENTER_FRAME,movePlane);
MovieClip(parent).removePlane(this);
gotoAndPlay("explode");
}
// 移除舞台上的飞机和事件
public function deletePlane() {
removeEventListener(Event.ENTER_FRAME,movePlane);
MovieClip(parent).removePlane(this);
parent.removeChild(this);
}
}
}

package {
import flash.display.MovieClip;
import flash.events.Event;
import flash.utils.getTimer;
import flash.utils.Timer;
import flash.events.TimerEvent;
public class Bullet extends MovieClip {
private var dy:Number; // 子弹的速度、方向。
private var lastTime:int;
public function Bullet(x,y:Number, speed: Number) {
// 初始位置
this.x = x;
this.y = y;
// 得到速度
dy = speed;
// 动画
lastTime = getTimer();
addEventListener(Event.ENTER_FRAME,moveBullet);
}
public function moveBullet(event:Event) {
// 得到时差
var timePassed:int = getTimer()-lastTime;
lastTime += timePassed;
// 子弹运动
this.y += dytimePassed/1000;
// 子弹越过屏幕的顶端
if (this.y < 0) {
deleteBullet();
}
}
// 移除舞台的子弹和事件
public function deleteBullet() {
MovieClip(parent).removeBullet(this);
parent.removeChild(this);
removeEventListener(Event.ENTER_FRAME,moveBullet);
}
}
}