这里是错误 >> TypeError: Error #1034: Type Coercion failed: cannot convert flash.display::Stage@261b4089 to flash.display.MovieClip。在 com.ply::Heli/fireBullet() 在 com.ply::Heli/myOnPress()
这是 Heli 的课程：
package com.ply
{
import flash.display.MovieClip;
import flash.display.*;
import flash.events.Event;
import flash.events.KeyboardEvent;
import flash.ui.Keyboard;
import com.peluru.Bullet;
public class Heli extends MovieClip
{
var shotCooldown:int;
const MAX_COOLDOWN = 10;
//Settings
public var xAcceleration:Number = 0;
public var yAcceleration:Number = 0;
private var xSpeed:Number = 0;
private var ySpeed:Number = 0;
private var up:Boolean = false;
private var down:Boolean = false;
private var left:Boolean = false;
private var right:Boolean = false;
public function Heli()
{
shotCooldown = MAX_COOLDOWN;
bullets = new Array();
addEventListener(Event.ENTER_FRAME, update);
addEventListener(Event.ADDED_TO_STAGE, onAddedToStage);
init();
}
public function onAddedToStage(event:Event):void
{
removeEventListener(Event.ADDED_TO_STAGE, onAddedToStage);
stage.addEventListener(KeyboardEvent.KEY_DOWN, myOnPress);
stage.addEventListener(KeyboardEvent.KEY_UP, myOnRelease);
init();
}
private function init():void
{
addEventListener(Event.ENTER_FRAME, RunHeli);
}
private function RunHeli(event:Event):void
{
xSpeed += xAcceleration ; //increase the speed by the acceleration
ySpeed += yAcceleration ; //increase the speed by the acceleration
xSpeed *= 0.95; //apply friction
ySpeed *= 0.95; //so the speed lowers after time
if(Math.abs(xSpeed) < 0.02) //if the speed is really low
{
xSpeed = 0; //set it to 0
//Otherwise I'd go very small but never really 0
}
if(Math.abs(ySpeed) < 0.02) //same for the y speed
{
ySpeed = 0;
}
xSpeed = Math.max(Math.min(xSpeed, 10), -10); //dont let the speed get bigger as 10
ySpeed = Math.max(Math.min(ySpeed, 10), -10); //and dont let it get lower than -10
this.x += xSpeed; //increase the position by the speed
this.y += ySpeed; //idem
}
public function update(e:Event){
shotCooldown-- ;
}
/**
* Keyboard Handlers
*/
public function myOnPress(event:KeyboardEvent):void
{
if(event.keyCode == Keyboard.LEFT)
{
xAcceleration = -1;
}
else if(event.keyCode == Keyboard.RIGHT)
{
xAcceleration = 1;
}
else if(event.keyCode == Keyboard.UP)
{
yAcceleration = -1;
}
else if(event.keyCode == Keyboard.DOWN)
{
yAcceleration = 1;
}
else if (event.keyCode == 32)
{
fireBullet();
}
}
public function myOnRelease(event:KeyboardEvent):void
{
if(event.keyCode == Keyboard.LEFT || event.keyCode == Keyboard.RIGHT)
{
xAcceleration = 0;
}
else if(event.keyCode == Keyboard.UP || event.keyCode == Keyboard.DOWN)
{
yAcceleration = 0;
}
}
public function fireBullet() {
if (shotCooldown <=0 )
{
shotCooldown=MAX_COOLDOWN;
var b = new Bullet();
var b2= new Bullet();
b.x = this.x +20;
b.y = this.y ;
b2.x= this.x -20;
b2.y= this.y ;
MovieClip(parent).bullets.push(b);
MovieClip(parent).bullets.push(b2);
trace(bullets.length);
parent.addChild(b);
parent.addChild(b2);
}
}
}
}
这是主要课程
package
{
import com.ply.Heli;
import com.peluru.Bullet;
import com.musuh.Airplane2;
import flash.display.Sprite;
import flash.display.Stage;
import flash.display.MovieClip;
import flash.events.KeyboardEvent;
import flash.ui.Keyboard;
import flash.display.*;
import flash.events.*;
import flash.utils.*;
public class Main extends MovieClip
{
public static const STATE_INIT:int = 10;
public static const STATE_START_PLAYER:int = 20;
public static const STATE_PLAY_GAME:int = 30;
public static const STATE_REMOVE_PLAYER:int = 40;
public static const STATE_END_GAME:int = 50;
public var gameState:int = 0;
public var player:Heli;
public var enemy:Airplane2;
//public var bulletholder:MovieClip = new MovieClip();
//================================================
public var cTime:int = 1;
//the time it has to reach in order to be allowed to shoot (in frames)
public var cLimit:int = 10;
//whether or not the user is allowed to shoot
public var shootAllow:Boolean = true;
//how much time before another enemy is made
public var enemyTime:int = 0;
//how much time needed to make an enemy
//it should be more than the shooting rate
//or else killing all of the enemies would
//be impossible :O
public var enemyLimit:int = 64;
//the player's score
public var score:int = 0;
public var gameOver:Boolean = false;
public var bulletContainer:MovieClip = new MovieClip();
//================================================
private var nextPlane:Timer;
public var enemies:Array;
public var bullets:Array;
public function Main()
{
gameState = STATE_INIT;
gameLoop();
}
public function gameLoop(): void {
switch(gameState) {
case STATE_INIT :
initGame();
break
case STATE_START_PLAYER:
startPlayer();
break;
case STATE_PLAY_GAME:
playGame();
break;
case STATE_REMOVE_PLAYER:
//removePlayer();
break;
case STATE_END_GAME:
break;
}
}
public function initGame() :void {
enemies = new Array();
bullets = ne Array();
setNextPlane();
gameState = STATE_START_PLAYER;
gameLoop();
//stage.addEventListener(Event.ENTER_FRAME, AddEnemy);
stage.addEventListener(Event.ENTER_FRAME, back);
stage.addEventListener(Event.ENTER_FRAME,checkForHits);
}
public function setNextPlane() {
nextPlane = new Timer(1000+Math.random()*1000,1);
nextPlane.addEventListener(TimerEvent.TIMER_COMPLETE,newPlane);
nextPlane.start();
}
public function newPlane(event:TimerEvent) {
// random side, speed and altitude
// create plane
var enemy:Airplane2 = new Airplane2();
enemy.y = -1 * enemy.height;
//making the enemy's x coordinates random
//the "int" function will act the same as Math.floor but a bit faster
enemy.x = Math.floor(Math.random()*(stage.stageWidth - enemy.width));
//then add the enemy to stage
addChild(enemy);
enemies.push(enemy);
// set time for next plane
setNextPlane();
}
public function removePlane(plane:Airplane2) {
for(var i in enemies) {
if (enemies[i] == plane) {
enemies.splice(i,1);
break;
}
}
}
// take a bullet from the array
public function removeBullet(bullet:Bullet) {
for(var i in bullets) {
if (bullets[i] == bullet) {
bullets.splice(i,1);
break;
}
}
}
public function checkForHits(event:Event) {
for(var bulletNum:int=bullets.length-1;bulletNum>=0;bulletNum--){
for (var airplaneNum:int=enemies.length-1;airplaneNum>=0;airplaneNum--) {
if (bullets[bulletNum].hitTestObject(enemies[airplaneNum])) {
enemies[airplaneNum].planeHit();
bullets[bulletNum].deleteBullet();
trace("kena");
//shotsHit++;
//showGameScore();
break;
}
}
}
//if ((shotsLeft == 0) && (bullets.length == 0)) {
// endGame();
//}
}
public function back( evt:Event ):void
{ // Backgroud Land
if (Dessert2.y >= 0 && Dessert.y >= 720)
{
Dessert.y = Dessert2.y - 1240 ;
}
else if (Dessert.y >= 0 && Dessert2.y >= 720)
{
Dessert2.y = Dessert.y - 1240 ;
}
else
{
Dessert.y = Dessert.y +5 ;
Dessert2.y = Dessert2.y +5 ;
}
// Background Clouds
if (Clouds2.y >= 0 && Clouds.y >= 720)
{
Clouds.y = Clouds2.y - 2480 ;
}
else if (Clouds.y >= 0 && Clouds2.y >= 720)
{
Clouds2.y = Clouds.y - 2480 ;
}
else
{
Clouds.y = Clouds.y +10 ;
Clouds2.y = Clouds2.y +10 ;
}
}
public function startPlayer() : void {
player=new Heli();
player.x = stage.stageWidth / 2;
player.y = stage.stageHeight / 2;
// add Player to display list
stage.addChild(player);
gameState = STATE_PLAY_GAME;
}
public function playGame():void {
gameLoop();
//txtScore.text = 'Score: '+score;
}
function AddEnemy(event:Event){
if(enemyTime < enemyLimit){
enemyTime ++;
} else {
//defining a variable which will hold the new enemy
enemy =new Airplane2();
//making the enemy offstage when it is created
enemy.y = -1 * enemy.height;
//making the enemy's x coordinates random
//the "int" function will act the same as Math.floor but a bit faster
enemy.x = Math.floor(Math.random()*(stage.stageWidth - enemy.width));
//then add the enemy to stage
addChild(enemy);
//and reset the enemyTime
enemyTime = 0;
}
if(cTime <= cLimit){
cTime ++;
} else {
//if it has, then allow the user to shoot
shootAllow = true;
//and reset cTime
cTime = 1;
}
}
}
}