我正在制作一个 2d 射击游戏,并试图让不同的攻击对某些敌人类型产生不同的影响。我将子弹和敌人放入两个数组中,然后使用 for 循环对子弹和敌人执行 hitTestObject。这一切都有效,但是我在 Bullet 类中有一个公共静态函数,它将它的类型作为字符串返回,而在 Enemy 类内部有一个公共静态函数,它接受一个字符串,然后使用开关来消除敌人受到的伤害。当我运行我的程序时,我不断收到错误 #1069:在 obj.QuickBullet 上找不到属性 getType 并且没有默认值。
敌人的代码。
package char {
import flash.display.MovieClip;
import flash.events.Event;
import flash.display.Stage;
public class Enemy1 extends MovieClip {
private var _type:String;
private static var _health:Number;
private var _vx:Number;
private var _vy:Number;
private var _stage:Stage;
private static var _instance:Enemy1;
public function Enemy1() {
init();
}
private function init():void {
//Vars
_vx = -10;
_vy = Math.random()*10;
_health = 1;
_stage = Main.getStage();
_instance = this;
//Listeners
addEventListener(Event.ADDED_TO_STAGE, onAdded);
addEventListener(Event.ENTER_FRAME, enemyLoop);
addEventListener(Event.REMOVED_FROM_STAGE, onRemoved);
//Add Enemy
Main.getInstance().addChild(this);
}
//When Added
private function onAdded(event:Event):void{
//Set position
this.x = _stage.stageWidth;
this.y = Math.random() * _stage.stageHeight;
//trace("Enemy created");
dispatchEvent(new Event("enemyCreated", true));
}
//Loop
private function enemyLoop(event:Event):void {
//Move
x += _vx;
y += _vy;
//Boundaries
if ( this.y <= 0 + this.height/2){
this.y = this.height/2;
_vy *= -1;
}
if ( this.y >= _stage.stageHeight - this.width/2){
this.y = _stage.stageHeight - this.width/2;
_vy *= -1;
}
//Health cheack
if ( _health <= 0){
if (this.parent) {
this.parent.removeChild(this);
}
trace(this + " is dead.");
}
//Leaves screen
if (this.x <= -this.width){
Main.getInstance().removeChild(this);
}
}
public static function isHit(type:String):void{
switch(type){
case "power" :
_health -= 1;
break;
case "quick" :
_health -= 1;
break;
case "strong" :
_health -= 1;
break;
default:
_health -= 1;
}
}
public static function getEnemy1():Enemy1{
return _instance;
}
//When Removed
private function onRemoved(event:Event):void {
removeEventListener(Event.ADDED_TO_STAGE, onAdded);
removeEventListener(Event.ENTER_FRAME, enemyLoop);
removeEventListener(Event.REMOVED_FROM_STAGE, onRemoved);
//trace("enemy removed");
}
}
}
子弹代码。
package obj {
import flash.display.MovieClip;
import flash.events.Event;
import flash.display.Stage;
public class PowerBullet extends MovieClip {
//const
private static const TYPE:String = "power";
//Varibles
private var _vx:Number;
private var _vy:Number;
private var _startX:Number;
private var _startY:Number;
private var _stage:Stage;
public function PowerBullet(startX:Number, startY:Number) {
_startX = startX;
_startY = startY;
addEventListener(Event.ADDED_TO_STAGE, onAddedToStage);
Main.getInstance().addChild(this);
}
//When created
private function onAddedToStage(event:Event):void{
//Initialize vars
this.x = _startX;
this.y = _startY;
_vx = 20;
_vy = 0;
_stage = Main.getStage();
dispatchEvent(new Event("bulletCreated", true));
//Event Handlers
addEventListener(Event.ENTER_FRAME, bulletLoop);
addEventListener(Event.REMOVED_FROM_STAGE, onRemoved);
}
//Bullet loop
private function bulletLoop(event:Event):void {
//Move bullet
x += _vx;
y += _vy;
if (this.x - this.width > _stage.stageWidth)
{
parent.removeChild(this);
}
}
public static function getType():String{
return TYPE;
}
//When Removed
private function onRemoved(event:Event):void {
removeEventListener(Event.ENTER_FRAME, bulletLoop);
removeEventListener(Event.ADDED_TO_STAGE, onAddedToStage);
removeEventListener(Event.REMOVED_FROM_STAGE, onRemoved);
}
}
}
我正在使用的 for 循环。
for (var i:int = 0; i < _enemies.length; i++){
for(var j:int = 0; j < _bullets.length; j++){
if(_bullets[j].hitTestObject(_enemies[i])){
if (_bullets[j].parent) {
_bullets[j].parent.removeChild(_bullets[j]);
}
_enemies[i].isHit(_bullets[j].getType());
_enemies.splice(i, 1);
_bullets.splice(j, 1);
i--;
j--;
Main.setScore(10);
}
}
}