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Automate current erase effect

Posted on 2010-01-12
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Last Modified: 2013-11-11
Hey,

I currently got an erase effect where you "scratch" off a top layer and and have a layer underneath. This is working fine. You move the mouse over the mask, hold down the button and it will erase and show whats underneath.

What im looking to do is, set a timer like:
eraseTimer = setInterval(automateErase, 5000);
The thought is, if the user hasn't erased anything within five seconds, an automated erase will start. (could be a up and down/side-to-side movement, until everything is "erased")

Any thoughts?
Ive attached the code and file - if anyone wants to look at that.
this.createEmptyMovieClip('mask_mc',0); 
bg_mc.setMask(mask_mc);
var contor:Number=0;

// function drawCircle draws a circle on mask_mc MovieClip of radius r and having center to mouse coordinates
function drawCircle(mask_mc:MovieClip):Void{
	var r:Number = 15;
	var xcenter:Number = _xmouse;
	var ycenter:Number = _ymouse;
	var A:Number = Math.tan(22.5 * Math.PI/180);
	var endx:Number;
	var endy:Number;
	var cx:Number;
	var cy:Number;
	
	mask_mc.beginFill(0x000000, 100);
	mask_mc.moveTo(xcenter+r, ycenter);
	for (var angle:Number = Math.PI/4; angle<=2*Math.PI; angle += Math.PI/4) {
	   xend = r*Math.cos(angle);
	   yend = r*Math.sin(angle);
	
	   xbegin =xend + r* A *Math.cos((angle-Math.PI/2));
	   ybegin =yend + r* A *Math.sin((angle-Math.PI/2));
	   mask_mc.curveTo(xbegin+xcenter, ybegin+ycenter, xend+xcenter, yend+ycenter);
	}
	mask_mc.endFill();
}

// contor variable is used to hold if the mouse is pressed (contor is 1) or not (contor is 0)
this.onMouseDown=function(){
	drawCircle(mask_mc);
	contor=1;
}

// if the mouse is hold and moved then we draw a circle on the mask_mc
this.onMouseMove=this.onEnterFrame=function(){
	if (contor==1){
		drawCircle(mask_mc);
	}
}
this.onMouseUp=function(){
	contor=0;
}

Open in new window

EraseEffect.zip
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Question by:mrsam
2 Comments
 
LVL 19

Accepted Solution

by:
moagrius earned 2000 total points
ID: 26299441
if you want to keep the same effect, just run a function very similar to drawCircle on enterFrame (or setInterval), and instead of _xmouse and _ymouse, just use two incrementing numbers.  if you want up down, run _destY up from 0 until it hits Stage.height, then reset it to 0 and _destX += 15...  when _destX is >= Stage.width, kill the enterframe/interval...  just swap that logic for side to side erasure...
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Author Comment

by:mrsam
ID: 26535128
Hmm thought I accepted this a long time ago :/

Thanks a lot for your help!
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