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 Tutorials » Math-Physics
First code we'll add is to create the loop, nothing new for any of you I'm sure gotoAndPlay(9); Next we'll set up our method for attaching instances of each MovieClip to the approriate y positions (top/bottom) and randomly place them on the x coordinate.
delay--;
if(delay <= 0) {
delay = 30;
x++;
_root.attachMovie("ball", "ball"+x, x+100);
this["ball"+x]._x = random(200) + 150;
this["ball"+x]._y = 0;
numBalls = ballsOnScreen.push("ball"+x);
_root.attachMovie("box", "box"+x, x+150);
this["box"+x]._x = random(200) +150;
this["box"+x]._y = 400;
numBoxes = boxesOnScreen.push("box"+x);
}
Code ExplanationEach time the code in this frame runs we'll decrement delay by one, delay is what we'll use to time how often a new instance is placed. When delay reaches 0 it's time to place another instance of each movieclip on the screen. We have to reset delay to 30 so the timer starts over again next time this frames code is run. Increment x each time a new set of instances is dropped so each instance used has a unique name, "ball"+x or "box"+x. Next, attach an instance of the ball movieclip, giving it a random x coordinate between 150 and 349, and a y coordinate at 0 so it starts at the top of the screen. ballsOnScreen is an array we'll use to keep track of the ball instances that are currently attached, so when a new ball instance is created we need to add it's name to the array, and of course when one is removed we'll need to remove it from the array. Last, do the same exact thing for the boxes, except place them at the bottom of the screen, in this case that's y=400.
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Mass Collision Detection
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