在宇宙飞船的位置射击炸弹

Question

对于一个学校项目，我必须制造一个可以投掷炸弹的移动宇宙飞船。移动部件可以工作（它会掉落一颗炸弹）但它只能在一个位置下降。如何编辑我的代码，使其落在宇宙飞船的位置？我已将大部分代码更改为英语。

var canvas;
var stage;
var image;
var theSpaceship;
var moveRight = false;
var moveLeft = false;
var moveDown = false;
var moveUp = false;
var bombPng;
var bomb;
var loadedBomb = false;

function init() {
    canvas = document.getElementById("canvas");
    stage = new createjs.Stage(canvas);
    maakPlaatje();
    document.onkeydown = handleKeyDown;
    document.onkeyup = handleKeyUp;
    new createjs.Ticker.setFPS(60); // frames per sec.
    createjs.Ticker.addListener(window);
}

function maakPlaatje() {
    image = new Image();
    var url = "ruimteschip.png";
    image.src = url;
    image.onload = loadGraphics;
}

function loadGraphics() {
    theSpaceship = new createjs.Bitmap(image);
    tekenPlaatje();
}

function tekenPlaatje() {
    theSpaceship.x = 0;
    theSpaceship.y = 0;
    stage.addChild(theSpaceship);
    stage.update();

}

function loadGraphicsKogelImage() {
    bomb = new createjs.Bitmap(bombPng);
    bomb.scaleX = bomb.scaleY = 0.1;
    bomb.x = 350;
    bomb.y = 1;
    stage.addChild(bomb);
    stage.update();
    loadedBomb = true;
    console.log(rsposx);
}

function schiet() {
    if (bomb == null) {
        bombPng = new Image();
        var url = "missile.png";
        bombPng.src = url;
        bombPng.name = 'popBitmap';
        bombPng.onload = loadGraphicsKogelImage;
    }
}

function beweegKogel() {
    //eerst checken of de bomb wel bestaat
    if (bomb != null) {
        bomb.y = bomb.y + 5;
        if (bomb.y > canvas.height) {
            stage.removeChild(bomb);
            bomb = null;
        } // end if >canvas.height
    } // end if bomb bestaat
} // end functie

function handleKeyDown(e) {
    // cross browser 'e' definieren:        
    if (!e) {
        var e = window.event;
    }
    if (e.keyCode == 39) {
        // pijltje rechts ingedrukt.
        moveRight = true;
    }
    if (e.keyCode == 37) {
        // pijltje rechts ingedrukt.
        moveLeft = true;
    }
    if (e.keyCode == 38) {
        // pijltje rechts ingedrukt.
        moveUp = true;
    }
    if (e.keyCode == 40) {
        // pijltje rechts ingedrukt.
        moveDown = true;
    }
    if (e.keyCode == 32) {
        // spatiebalk ingedrukt.
        schiet();
    } else {
        console.log("welke toets? maar het nummer is " + e.keyCode);
    }
}

function handleKeyUp(e) {
    // cross browser 'e' definieren:        
    if (!e) {
        var e = window.event;
    }
    if (e.keyCode == 39) {
        moveRight = false;
    }
    if (e.keyCode == 37) {
        moveLeft = false;
    }
    if (e.keyCode == 40) {
        moveDown = false;
    }
    if (e.keyCode == 38) {
        moveUp = false;
    }
}

var speed = 10;

function tick() {
    stage.update();
    if (theSpaceship != null) {
        // indien moveRight true is, loopt het plaatje:
        if (moveRight)
            theSpaceship.x = theSpaceship.x + speed;
        if (moveLeft)
            theSpaceship.x = theSpaceship.x - speed;
        if (moveDown)
            theSpaceship.y = theSpaceship.y + speed;
        if (moveUp)
            theSpaceship.y = theSpaceship.y - speed;
        if (theSpaceship.x > canvas.width)
            theSpaceship.x = 0;
        if (theSpaceship.y > canvas.height)
            theSpaceship.y = 0;
        if (loadedBomb)
            beweegKogel();
    }


}