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jamesp67108574
jamesp67108574
Participant
April 23, 2019
解決済み

Trouble Creating and Randomizing Location of MovieClip

  • April 23, 2019
  • 返信数 2.
  • 518 ビュー

I am trying to make a game and I want to spawn 5 enemies when the game opens and place them in random places on the screen, but I can't figure it out.

The movieclip I am using is named Enemy and the linkage is named the exact same - Enemy

Here is what I have so far on the first frame::

var enemiesarray:Array;

enemiesarray = [];

function addEnemy():void

{

    if(enemiesarray.length < 5)

    {

      

        var e:Enemy = new Enemy();

        var startX:int = Math.random()*500-10; stage.stageWidth ;

        var startY:int = Math.random()*500-10; stage.stageHeight ;

   

        stage.addChild(e);

      

        enemiesarray.push(e);

    }

}

    このトピックへの返信は締め切られました。
    解決に役立った回答 JoãoCésar17023019

    Besides of what Clay said, I want to point out that each of these two lines has an extra semicolon:

    var startX:int = Math.random()*500-10; stage.stageWidth;
    var startY:int = Math.random()*500-10; stage.stageHeight;

    And your function will only generate one enemy if you don't call it more than once.

    One suggestion to achieve what you want is like this:

    import flash.display.DisplayObjectContainer;
    var enemies:Vector.<Enemy> = new Vector.<Enemy>();
    // alternatively, you can write:
    // var enemies:Array = [];
    function addEnemies(container:DisplayObjectContainer, total:uint, minX:int, maxX:int, minY:int, maxY:int):void
    {
         for (var i:uint = 0; i < total; i++)
         {
              enemies = new Enemy();
              enemies.x = Math.random() * (maxX - minX) + minX;
              enemies.y = Math.random() * (maxY - minY) + minY;
              container.addChild(enemies);
         }
    }
    addEnemies(stage, 5, 0, stage.stageWidth, 0, stage.stageHeight);

    I hope this helps.

    Regards,

    JC

    返信数 2

    JoãoCésar17023019
    Community Expert
    JoãoCésar17023019Community Expert解決！
    Community Expert
    April 23, 2019

    Besides of what Clay said, I want to point out that each of these two lines has an extra semicolon:

    var startX:int = Math.random()*500-10; stage.stageWidth;
    var startY:int = Math.random()*500-10; stage.stageHeight;

    And your function will only generate one enemy if you don't call it more than once.

    One suggestion to achieve what you want is like this:

    import flash.display.DisplayObjectContainer;
    var enemies:Vector.<Enemy> = new Vector.<Enemy>();
    // alternatively, you can write:
    // var enemies:Array = [];
    function addEnemies(container:DisplayObjectContainer, total:uint, minX:int, maxX:int, minY:int, maxY:int):void
    {
         for (var i:uint = 0; i < total; i++)
         {
              enemies = new Enemy();
              enemies.x = Math.random() * (maxX - minX) + minX;
              enemies.y = Math.random() * (maxY - minY) + minY;
              container.addChild(enemies);
         }
    }
    addEnemies(stage, 5, 0, stage.stageWidth, 0, stage.stageHeight);

    I hope this helps.

    Regards,

    JC

    C
    ClayUUID
    Legend
    April 23, 2019

    You forgot to use the container parameter that's passed into that function.

    Also, using enemies so many times instead of a local variable isn't great practice.

    JoãoCésar17023019
    Community Expert
    JoãoCésar17023019Community Expert
    Community Expert
    April 23, 2019

    Fixed the container part. That was a last minute addition.

    C
    ClayUUID
    Legend
    April 23, 2019

    So you're instantiating a new instance of Enemy.

    Then you're adding that instance to the stage.

    Then you're also pushing a reference to that instance onto enemiesarray.

    So why aren't you ever assigning to the .x or .y coordinates of your Enemy instance? If you're intending to write a game you surely already understand how to programmatically position clips on the stage.

    Adobe Flash Platform * Changing position

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