如何在按下按钮时删除子/精灵?

时间:2017-05-02 00:13:40

标签: actionscript-3 animation actionscript

我正在开展一个项目,如果用户点击"种植花园",它将生成随机数量的花和随机数量的杂草。一旦他们完成了他们的成长'顺序,向用户呈现"成长新花园"将花/杂草从舞台上删除并重新开始。

我已经绞尽脑汁,这是我最接近的目标"去除孩子" - 我从未理解的概念哈哈。非常感谢任何帮助/指导。

**编辑代码,因为我复制了旧文件**

import flash.events.MouseEvent;
import flash.display.DisplayObject;

// stops the playhead on frame 1
stop();

// random amount of flowers generated
var flowerAmount:int = (Math.ceil((Math.random() * 20)) + 9);
var weedAmount = Math.ceil((Math.random() * 10));


// garden display container
var newGarden:DisplayObjectContainer;

// setting new flower variable equal to the function that creates an instance of the flower
var newFlower_mc:DisplayObject = newFlower();

// flowers currently in the garden
var flowersInGarden:int = 0;
var weedsInGarden:int = 0;


// event listener for the grow button to start the garden
grow_btn.addEventListener(MouseEvent.MOUSE_UP, frameTwo);

// when grow button is clicked go to frame two
function frameTwo(event:MouseEvent) {
    gotoAndPlay(2);
}

// changes the size and position of the flower
function configureFlower(myFlower_mc:DisplayObject) {
    myFlower_mc.x = Math.random() * 400;
    myFlower_mc.y = Math.random() * 200;
    var flowerSize:Number = Math.random() + .5;
    myFlower_mc.height = myFlower_mc.height * flowerSize;
    myFlower_mc.width = myFlower_mc.width * flowerSize;
}
import flash.display.DisplayObject;

// function to create new instance of a flower
function newFlower():DisplayObject {
    var newFlower_mc:DisplayObject = new flower();
    return newFlower_mc;
}

// function to call the create flower function and add flower to sprite 
function createFlower() {
    var myFlower_mc = newFlower();
        configureFlower(myFlower_mc);
        newGarden.addChild(myFlower_mc);
    trace(flowerAmount);
    }

newGarden = new Sprite();

// adds the flower to the stage/sprite and adds to the flower counter
    function showFlowers() {
    createFlower();
    addChild(newGarden);
    flowersInGarden++;
    trace("Flowers:" + flowersInGarden + " " + weedAmount + " weedsingarden" + weedsInGarden);


}
// calls the above function
showFlowers();


// function to create a weed, configure weed and add to the garden sprite
function createWeed(){ 
    var newWeed:DisplayObject; 
    trace("creating weed"); 
    newWeed = new weed(); 
    newGarden.addChild(newWeed); 
    configureFlower(newWeed);
    weedsInGarden++;
}// if all the flowers haven't grown yet, go back to frame 2 until they have

if (flowersInGarden < flowerAmount) {
    gotoAndPlay(2);
}

// if the amount of weeds decided haven't grown yet, create another weed

if (weedsInGarden < weedAmount){ createWeed(); };
stop();

// event listener to grow a new garden
new_btn.addEventListener(MouseEvent.MOUSE_UP, growNewGarden);


// function to create a new garden if there are more than 1 instance in the container
function growNewGarden(event:MouseEvent) {
    while (newGarden.numChildren > 0) {
    stage.removeChild(newFlower_mc); 
        stage.removeChild(newGarden);
        // add a new, fresh sprite
        stage.addChild(newGarden);
        // randomly chooses a number of flowers
        flowerAmount = (Math.ceil((Math.random() * 21)) + 10);
        // resets flower counter to zero
        flowersInGarden = 0;
    gotoAndPlay(2);

}}

1 个答案:

答案 0 :(得分:1)

如果要使用numChildren属性作为属性进行循环,则应该使用子索引作为循环中的变量来选择子项。你所做的就是你循环遍历孩子并试图删除一些名为newFlower_mc的东西,或者类似的东西,而这个变量并不代表该函数范围内的任何东西。它可能看起来像这样

for (var i:int = newGarden.numChildren - 1; i >= 0; i--){
    var f:DisplayObject = newGarden.getChildAt(i);
    f.parent.removeChild(f);
}

所以这是一种方式。

我认为除去花园会更简单,因为所有的杂草和花朵都是花园的孩子,它们也会被移除。简单地:

newGarden.parent.removeChild(newGarden);

瞧!

另外,只是关于var newFlower_mc = newFlower();的旁注。我不确定你明白这是做什么的。它没有将变量设置为等于函数。它设置该变量等于输出或该函数被调用一次的结果。这行代码执行此操作:

  1. 声明一个名为newFlower_mc的唯一名称的变量。
  2. 调用返回newFlower()
  3. 的构造函数DisplayObject
  4. 将返回的DisplayObject实例设置为变量newFlower_mc
  5. 这一切都很好,但你有问题。稍后,在newFlower的构造函数中,您声明另一个变量...,其名称已在使用中...... newFlower_mc。这是不好的。我不知道结果是什么。如果flash以某种方式允许这种编译和运行没有错误我很惊讶,但无论如何这是不好的做法。我认为这是因为你不了解在设置变量=函数时会发生什么。我希望我的解释有所帮助。