Error using Arrays

[brendenc14282108]

I am trying to use Array to count my boxMC. my boxMC is on my background of WorldMC. Its saying that my line of

"for (var count=0; count<boxMC.length; count++){

     boxMC[count].update();

}"

Has no default value

Here is my error:

ReferenceError: Error #1069: Property update not found on tankscript.turrent.Box and there is no default value.

var boxMC:Array;

  boxMC = new Array();

  //------------------------------

  // -----Box Spawning------------

  //------------------------------

  //only spawn a box if there are less tan 100 already on screen

  while(WorldMC.numChildren<10)

  {

  // Make a new instance of the box class

  var bx = new Box();

  // add the box to the display list

  WorldMC.addChild(bx);

  //position and rotate the Box;

  bx.x = Math.random() * -1100;

  bx.y = Math.random() * 1;

  bx.rotation = 40;

  // add the box to list of box

  boxMC.push(bx);

  }

  for (var count=0; count<boxMC.length; count++){

  boxMC[count].update();

  }

}

[kglad]

again, you've made boxMC local to loop and after each loop call, boxMC no longer exists.  when the next loop call occurs the previous is gone, even if you didn't reinitialize it.

use

  var boxMC:Array;

  boxMC = new Array();

outside loop() up at the top of your code near bulletMC declaration.

[kglad]

(p.s when using the adobe forums, please mark helpful/correct responses, if there are any.)

[brendenc14282108]

will do, i did move the code up to the bulletMC but it says Access of undefined property boxMC?

[kglad]

use

var boxMC:Array = new Array();  // all in one line to see if that's the problem.

[brendenc14282108]

There we go, it seemed it didn't like to be on separate lines.

[brendenc14282108]

It still seems as if it cant detect that my code of the:

for (var bcount=0; bcount<bulletMC.length; bcount++)

  {

  // if the bullets is touching the box

  if (boxMC[count].hitTestObject(bulletMC[bcount]))

  {

  trace("hit");

  }

[brendenc14282108]

i got it never mind

[brendenc14282108]

I have one last thing and then my game is complete. When there is a boxMC and a bulletMC on screen and they touch its able to destroy both and respawn a boxMC. But if the bulletMC misses and then i shoot another bulletMC and hit boxMC, boxMC will not respawn.

BUT, if i do shoot another bulletMC at the boxMC and they hit the boxMC, they will both be destroyed and boxMC will respawn.

It seems as if, since there is a bullet on screen it wont allow another box to respawn.

This is the code on where its missing up.

function loop(e:Event)

  {

  // Variables etc

  //------------------------------

  // -----Box Spawning------------

  //------------------------------

  //only spawn a box if there are less than 20 already on screen

  while (WorldMC.numChildren<20)

  {

  // Make a new instance of the box class

  var bx = new Box();

  // add the box to the display list

  WorldMC.addChild(bx);

  //position and rotate the Box;

  bx.x = Math.random() * -1100;

  bx.y = Math.random() * 1;

  bx.rotation = 40;

  // add the box to list of box

  boxMC.push(bx);

  }

  for (var bcount=bulletMC.length-1; bcount>=0; bcount--)

  {

  //update bullets

  bulletMC[bcount].startUpdate2();

  if (bulletMC[bcount].parent == null)

  {

  bulletMC.splice(bcount,1);

  bcount--;

  }

  }

  // make a loop to iterate through all the boxes

  for (var count=boxMC.length-1; count>=0; count--)

  {

  // update the boxes to move

  boxMC[count].startUpdate();

  // add a new loop to go through all the bullets;

  for (bcount=bulletMC.length-1; bcount>=0; bcount--)

  {

  // if the bullets is touching the box

  if (boxMC[count].hitTestObject(bulletMC[bcount]))

  {

  boxMC[count].health--;// lose 1 health

  WorldMC.removeChild(bulletMC[bcount]);

  bulletMC.splice(bcount,1);

  }

  }

  //if box is dead, remove it

  if (boxMC[count].health <= 0)

  {

  WorldMC.removeChild(boxMC[count]);

  boxMC.splice(count,1);

  }

  }

  }

  }

[kglad]

because of your (lack of) formatting i can't easily see what's in a for-loop and what's not.  ie, format your code.

[brendenc14282108]

This is the function loop that is spawning the boxes

function loop(e:Event)

  {

  // Variables etc

  //------------------------------

  // -----Box Spawning------------

  //------------------------------

  //only spawn a box if there are less than 20 already on screen

  while (WorldMC.numChildren<20)

      {

  // Make a new instance of the box class

  var bx = new Box();

  // add the box to the display list

  WorldMC.addChild(bx);

  //position and rotate the Box;

  bx.x = Math.random() * -1100;

  bx.y = Math.random() * 1;

  bx.rotation = 40;

  // add the box to list of box

  boxMC.push(bx);

       }

  for (var bcount=bulletMC.length-1; bcount>=0; bcount--)

       {

  //update bullets

  bulletMC[bcount].startUpdate2();

  if (bulletMC[bcount].parent == null)

            {

  bulletMC.splice(bcount,1);

  bcount--;

            }

       }

  // make a loop to iterate through all the boxes

  for (var count=boxMC.length-1; count>=0; count--)

       {

  // update the boxes to move

  boxMC[count].startUpdate();

  // add a new loop to go through all the bullets;

  for (bcount=bulletMC.length-1; bcount>=0; bcount--)

                 {

  // if the bullets is touching the box

  if (boxMC[count].hitTestObject(bulletMC[bcount]))

                           {

  boxMC[count].health--;// lose 1 health

  WorldMC.removeChild(bulletMC[bcount]);

  bulletMC.splice(bcount,1);

                              }

                      }

  //if box is dead, remove it

  if (boxMC[count].health <= 0)

                      {

  WorldMC.removeChild(boxMC[count]);

  boxMC.splice(count,1);

                      }

                 }

            }

  }

When he added splicing i feel as if it the problem of my code not working.

i added links here because i feel as if it be easier to see the code and have him talk then be trying to explain it.

In this video he added splices to his to account for both the bullet and box being on screen, Game Development in AS3 Part 7 - Hit tests and bugs galore - YouTube

then he had to change it to this in this video,

Game Development in AS3 Part 9 - Packages and Static Classes - YouTube

[kglad]

does WorldMC have any children other than the boxMC's?  eg, are the bullets children?

if so, that's a problem.

[brendenc14282108]

ah yes WorldMC does, it also has my turrentMC and another one too

[brendenc14282108]

yes the bulletMC are children that shoot out of the turrnetMC only when clicked, then added to WorldMC as children

[kglad]

then this is a problem if you're expecting 20 boxes to exist after execution:

  while (WorldMC.numChildren<20)

[brendenc14282108]

Then how would i be changing it? because i want 20 boxes to stay on screen at all times, well technically it will only be 18 boxes because of my turrentMC and the other thing being a child of WorldMC,

[kglad]

check for the box number, if that's what you want.

instead of that while statment, use:

if(boxNumF<18)

and add

function boxNumF():int{

var n:int=0;

for(var i:int=0;i<WorldMC.numChildren;i++){

if(WorldMC.getChildAt(i) is Box){

n++;

}

}

return n;

}

[brendenc14282108]

okay thank you very much

[kglad]

you're welcome.