Question

I am writing HitTestObject for my character:
(everycode is in ENTERFRAME section)

-for the Character:

if(bullet.bulletList.length>0)
    for (var i:int = 0; i < bullet.bulletList.length; i++)
    {   if(this.hitTestObject(bullet.bulletList[i]))
           {
               updateHP();
                        }
             }

-for the enermy attack code:

bullet= new Bullet();
bulletList.push(bullet);

At the begining when there is not bullet in the stage, no error produced, but when the first bullet addchild to stage, an error like this appeared:

TypeError: Error #2007: 参数 hitTestObject 不能为空。(something's like hisTestOject cannot be empty)
at flash.display::DisplayObject/_hitTest()
at flash.display::DisplayObject/hitTestObject()
at com.miraclei::char/loop()

I think it’s because when the first bullet removeFromStage, the hitTestObject function found nothing in the bulletList, then error happened. I tried many way but still not ok!
Someone has solution for this?

Answer 1

If I’m reading this correctly, the trick is to iterate through your array of bullets in descending numeric order:

for (var i:int = bullet.bulletList.length-1; i > -1; i-- )
{   etc..

you won’t run into empty array positions this way.

hope this help!