我对AS3有点陌生，我正在尝试为我的教育制作简单的射击游戏。 首先，我知道还有其他类似的问题，但我无法弄清楚我的问题是什么！所以如果有人能帮忙，我会很高兴:)(提前谢谢
我的船固定地左右移动，当我点击大按钮时会发射子弹。敌舰(杜斯曼/杜斯曼拉尔(也下来了。所以问题是我无法弄清楚一些子弹(mermi/mermiler(击中并用子弹本身摧毁了一些敌舰，但大多数时候子弹只是穿过敌舰，什么也没发生。当然，animate 会给出错误参数命中测试对象在此项目中必须是非空的！
我在这里做错了什么？
var mermiler: Array = new Array(); //mermiler means bullets
var dusmanlar: Array = new Array(); // dusmanlar means enemy ships
var game_speed: int = 20;
var game_timer: int = 0;
var oyunHiz: int = 8; //bullet speed
var skor: Number = 0;
btn.addEventListener(MouseEvent.CLICK, ates);
function ates(event: MouseEvent): void {
//whenever the mouse is pressed add the Bullet from the library to the screen
var mermi: Mermi = new Mermi();
mermi.x = gemi.x;
mermi.y = gemi.y - (gemi.height / 2);
addChild(mermi);
//add it to the bullet array so we can loop through to move and hit test
mermiler.push(mermi);
}
addEventListener(Event.ENTER_FRAME, basla);
function basla(event: Event): void {
game_timer++;
if (game_timer >= game_speed) {
var dusman: Dusman = new Dusman();
dusman.x = Math.random() * 640 + 10;
dusman.y = Math.random() * 100 - 120;
dusman.xspeed = (Math.random() * 15) - 10;
dusman.yspeed = (Math.random() * 5) + 10;
addChild(dusman);
dusmanlar.push(dusman);
game_timer = 0;
}
yaz.text = String(skor);
gemi.x = mouseX;
gemi.y = 750;
//move all enemy ships down the screen
for (i = 0; i < dusmanlar.length; i++) {
//move enemy ships
dusmanlar[i].y += dusmanlar[i].yspeed;
dusmanlar[i].x += dusmanlar[i].xspeed;
//bounce off sides
if (dusmanlar[i].x >= 640 || dusmanlar[i].x <= 0) {
dusmanlar[i].xspeed = -dusmanlar[i].xspeed;
}
//if reach bottom remove ship
if (dusmanlar[i].y >= 860) {
removeChild(dusmanlar[i]);
dusmanlar[i] = null;
dusmanlar.splice(i, 1);
break;
}
}
//move all the bullets on the screen up
for (var i: int = 0; i < mermiler.length; i++) {
//move bullets
mermiler[i].y -= 20;
//if bullets got of screen
if (mermiler[i].y <= 0) {
removeChild(mermiler[i]);
mermiler[i] = null;
mermiler.splice(i, 1);
break;
}
}
//test if any bullets have hit any ships
for (var j: int = 0; j < dusmanlar.length; j++) {
if (mermiler != null && dusmanlar[j].hitTestObject(mermiler[i])) {
if (mermiler.length != 0 && dusmanlar[j] != null && mermiler[i].hitTestObject(dusmanlar[j])) {
removeChild(dusmanlar[j]);
dusmanlar[j] = null;
dusmanlar.splice(j, 1);
removeChild(mermiler[i]);
mermiler[i] = null;
mermiler.splice(i, 1);
skor++
break;
}
}
}
}
你做了很多错误的事情。
首先，当您打算浏览数组以可能从中删除一个或多个元素时，请使用向后循环而不是向前循环，因为当您Array.splice(...(时，数组的其余部分会向左移动一个位置，并且您错过了一个对象。我在这个答案中解释了原理。你也不需要打破循环。
// Move all enemy ships down the screen.
for (i = dusmanlar.length - 1; i >= 0; i--)
{
// Get a ship to work with.
var aShip:Dusman = dusmanlar[i];
// Move the ship.
aShip.y += aShip.yspeed;
aShip.x += aShip.xspeed;
if (aShip.y > 860)
{
// Remove the ship if it reached the bottom.
removeChild(aShip);
dusmanlar.splice(i, 1);
}
else if (aShip.x > 640)
{
// Bounce the ship off right.
aShip.xspeed = -Math.abs(aShip.xspeed);
}
else if (aShip.x < 0)
{
// Bounce the ship off left.
aShip.xspeed = Math.abs(aShip.xspeed);
}
}
其次，您需要正确检查许多对象与许多对象。最直接的方法是检查每个可能的碰撞。
var aShip:Dusman;
var aBullet:Mermi;
// Prepare lists for objects to remove.
var deadShips:Array = new Array;
var deadBullets:Array = new Array;
// Iterate over all enemy ships, presently alive.
for each (aShip in dusmanlar)
{
// Iterate over all flying bullets in an inner loop.
for each (aBullet in mermiler)
{
// As both ship and bullet are listed in the respective Arrays,
// you don't need to check if they are not "null" or whatever.
if (aShip.hitTestObject(aBullet))
{
// Add them for deletion. But only once.
if (deadShips.indexOf(aShip) < 0)
{
deadShips.push(aShip);
}
// The bullets are iterated over in an inner loop,
// you can kill many ships with the single bullet,
// if it hits these ships at the same time.
// Also, a single ship can take several bullets at once,
// again, if they all hit simultaneously.
if (deadBullets.indexOf(aBullet) < 0)
{
deadBullets.push(aBullet);
}
}
}
}
// Now you have a list of killed ships and dead bullets.
// It's time to remove them.
var anIndex:int;
for each (aShip in deadShips)
{
anIndex = dusmanlar.indexOf(aShip);
// Sanity check.
if (anIndex > 0)
{
dusmanlar.splice(anIndex, 1);
}
// Another sanity check.
if (aShip.parent == this)
{
removeChild(aShip);
}
}
for each (aBullet in deadBullets)
{
anIndex = mermiler.indexOf(aBullet);
// Sanity check.
if (anIndex > 0)
{
mermiler.splice(anIndex, 1);
}
// Another sanity check.
if (aBullet.parent == this)
{
removeChild(aBullet);
}
}