I'm trying to make lots of the same object appear randomly on the screen subject to conditions and k
- by Katsideswide
Hi! A good friend recommended this site to me, it looks really useful! I'm a bit of a shameless noob at actionscript and after 3 days of tutorials and advice I've hit a brick wall.
I've managed to get a sensor attached to an arduino talking to flash using something called AS3glue. it works, when i set up a trace("leaf") for the contition that the sensor reads 0, i get a printout of the word "leaf". however i want the program to make a graphic appear on the screen when this condition is met, not just trace something.
I'm trying to get the program to generate a library object called "Enemy" on the screen at a random position each time the conditions are met. It's called enemy because I was following a game tutorial...actually it's a drawing of a leaf.
Here's the bit of the code which is causing me problems:
var army:Array; var enemy:Enemy;
function AvoiderGame() { army =
new Array(); var newEnemy = new
Enemy( 100, 100 ); army.push(
newEnemy ); addChild( newEnemy );
}
function timerEvent(event:Event):void
{
if (a.getAnalogData(0) ==0 &&
a.getAnalogData(0) !=
this.lastposition){
trace("leaf");
var randomX:Number = (Math.random() * 200) + 100;
var randomY:Number = (Math.random() * 150) + 50;
var newEnemy = new Enemy( randomX, randomY);
army.push( newEnemy );
addChild( newEnemy );
} else if (a.getAnalogData(0) == 0) { //don't trace anything } else {
//don't trace anything }
this.lastposition =
a.getAnalogData(0); //afterwards, set
the position to be the new
lastposition and repeat.
}
I've imported "import
flash.display.MovieClip;"
and the code for the Enemy class looks
like this:
package { import
flash.display.MovieClip; public class
Enemy extends MovieClip { public
function Enemy( startX:Number,
startY:Number ) { x = startX;
y = startY; }
} }
Here's my error. I've tried googling, it seems like a pretty general error:
TypeError: Error #1009: Cannot access
a property or method of a null object
reference. at
as3glue_program_fla::MainTimeline/timerEvent()
at
flash.utils::Timer/_timerDispatch()
at flash.utils::Timer/tick()
I've made sure that the "Enemy" object is exported for AS3.
I'm going for something like this when it's programmed in AS2:
leafCounter = 0; //set the counter to
0 counter.swapDepths(1000); //puts the
counter on top of pretty much
anything, unless you make more than
1000 leaves! counter.textbox.text = 0;
//shows "0" in the text box in the
"counter" movie clip
this.onMouseDown = function() {
//triggers when the mouse is clicked
this.attachMovie("Leaf","Leaf"+leafCounter,leafCounter,{_x:Math.random()*Stage.width,_y:Math.random()*Stage.height,_rotation:Math.random()*360});
//adds a leaf to rthe stage with a
random position and random rotation
leafCounter++; //adds 1 to the leaf
counter counter.textbox.text =
leafCounter; //shows that number in
the text box }
I'm sure it must be a simple error, I can get the logic working when it just traces something on the screen but i can't get it to generate an "enemy"
Any help or hints would be really useful! I know this is a bit of a ham-fisted job of altering existing code.
