带有数组,循环和if语句的hitTestObject

时间:2017-04-24 16:25:29

标签: actionscript-3 flash

我让奴才在香蕉之后奔跑并且被箭头键控制。我也有一个生活吧,我会根据小奴是否掉落香蕉来跟踪它。我现在遇到的问题是当香蕉(从阵列中)撞到地面时,我的生命棒会完全掉落。我希望它能够逐渐逐渐每个打到地上的香蕉。我尝试使用调度事件,但它不起作用。

这就是我在主程序中所拥有的:

 import flash.display.MovieClip;
import flash.events.KeyboardEvent;
import flash.events.Event;

var leftKey:Boolean;
var rightKey:Boolean;
var upKey:Boolean;
var downKey:Boolean;
var jump:Boolean = false;
var xvelocity:int = 9;
var yvelocity:int = 3;
var gravity:Number = 7;

stage.addEventListener(Event.ENTER_FRAME, changeVelocity);
stage.addEventListener(KeyboardEvent.KEY_UP, checkKeyUp);
stage.addEventListener(KeyboardEvent.KEY_DOWN, checkKeyDown);

  function changeVelocity(evt:Event){
        moveMinion();
        yvelocity += gravity;
    }

    function moveMinion(){

        if (leftKey == true){
           sideMinion.x -= xvelocity;
            sideMinion.left();

        }
        if (rightKey == true){
            sideMinion.x += xvelocity;
            sideMinion.right();
        }
    }

    function checkKeyDown(e:KeyboardEvent){
        if (e.keyCode == Keyboard.LEFT){
            leftKey = true;
        }
        else if (e.keyCode == Keyboard.RIGHT){
            rightKey = true;
        }

    }

    function checkKeyUp(e:KeyboardEvent){
        if (e.keyCode == Keyboard.LEFT){
            leftKey = false;
        }
        else if (e.keyCode == Keyboard.RIGHT){
            rightKey = false;
            }
    }

    btnStart.addEventListener(MouseEvent.CLICK, makeItFall);

    function makeItFall(e:MouseEvent){
    var numBananas = 6;
    var theBananas: Array = new Array();
    theBananas = [];
    for (var i = 0; i < numBananas; i++) {
    var aBanana: banana = new banana();
    theBananas.push(aBanana);
    btnStart.visible=false;
    aBanana.y=100;
    theBananas[i].setSpot(Math.random()*450,Math.random()*200);
    theBananas[i].setSpeed((Math.random()), 1);
    stage.addChild(aBanana);

}   

var health: Number= 100;
var healthPercent: Number= 1;
var lives:Event= new Event("lifeDrops")

addEventListener(Event.ENTER_FRAME, pickUpBananas);

function pickUpBananas(event:Event){

    for (var i:int = theBananas.length-1; i>-1; i--){

            if (sideMinion.hitTestObject(theBananas[i])){
                stage.removeChild(theBananas[i]);
                theBananas.splice(i,1);

        }

            if (info.hitTestObject(theBananas[i])){
            dispatchEvent(lives);   
            health=health-10;
            healthPercent=health/100;
            trace(healthPercent);
            life.scaleX= healthPercent;
            text.text=String(health);


        }

        if (health<0){
            gotoAndStop(5);
        }
    }
}   
    }

stop();

在香蕉班:

    package {
    import flash.display.MovieClip;
    import flash.utils.Timer;
    import flash.events.TimerEvent;
    import flash.events.MouseEvent;
    import flash.events.Event;
    import flash.events.Event;

    public class banana extends MovieClip {

        var velX: Number = 0;
        var velY: Number = 0;
        var falling: Boolean = false;
        var gravity: Number = 2;

        public function banana() {
            var timing: Timer = new Timer(25, 0);
            timing.addEventListener(TimerEvent.TIMER, moveMe);
            timing.start();

        }

         private function moveMe(event: TimerEvent)
    {
        x += velX;
        y += velY;

        if (falling) velY += gravity;

       /* trace("[BANANA] position:", x, y, "speed:", velX, velY);*/
    }


        public function setSpeed(dx,dy) {
            velX = dx;
            velY = dy;
        }

            public function setSpot(atX,atY){
            this.x=atX;
            this.y=atY;
        }


        public function makeItFall (){
            falling=true;
        }


    }

}

2 个答案:

答案 0 :(得分:1)

您的pickUpBananas功能每帧运行并检查每个香蕉,看它是否接触地面。因此,如果香蕉击中,它将减少该帧的健康状况,并且每个后续帧,直到它不再接触地面。

你需要做些什么来防止同一个香蕉在后续帧中反复消耗健康状况。

具体的解决方案将取决于您希望游戏如何运作。您可以立即重置它的位置,使其不再接触地面,但您可能希望它保持坐在地上(或者至少在消失之前淡出)。在这种情况下,您可以在香蕉上设置一个标志,表明它已被计数,因此不再计算。如果你重新放下香蕉,请记得清除那面旗帜。

答案 1 :(得分:1)

您只是无法使用数据从阵列中删除香蕉。它需要从数组中删除,否则它将继续检查该香蕉是否正在点击info

theBananas.removeAt(i); //works with most recent flash players and Adobe air 

theBananas.splice(1,i); // works with all players and Adobe air versions

两种方法都做同样的事情,但removeAt更快更容易打字。

当然,您可以将此代码与info.hitTest中的其余块一起放入,例如,它可以直接放在text.text=String(health);下面

我也会继续使用theBananas[i].parent.removeChild(theBananas[i];从舞台上移除那根香蕉。当然,这需要在之前完成将其从数组中删除。

希望有所帮助。

编辑:@Cadin的答案是完全正确的。如何让香蕉停止触发hitTest取决于你想要它的外观和工作方式。我的答案只是一种方法。