javascript - Can't find error in JS code -


i have "bubble generator" working, not clearing bubbles , can't figure out why. been staring @ while now. specifically, of bubbles getting "cleared" float up, others aren't, , can't see why. argh!

http://jsfiddle.net/dud2q/7/ (slowed waaay down can watch single bubble)

logic flow (this describes code in fiddle):

  1. create imagedata array (long list of pixels)

    imgdata = ctx.getimagedata(0, 0, w, h);

  2. push new random bubbles onto beginning of "bubbles array" draws bottom-up:

    for(var i=0, l=generators.length; i<l; i++){     for(var j=0, m=0|math.random()*6; j<m; j++){         newbubbles.push( 0|generators[i] + j );     }     generators[i] = math.max(0, math.min(w, generators[i] + math.random()*10 - 5)); } bubbles.unshift(newbubbles);

  3. loop bubbles drawn and:

    1. clear bubbles drawn in last loop setting alpha channel 0 (transparent):

      if(i<(l-1)){     x = 0|bubbles[i+1][j];     offset = y * w * 4 + x * 4;     pixels[offset+3] = 0; }

    2. draw new bubbles (offset+1 = g, offset+2 = b, offset+3 = alpha):

      x = 0|(bubbles[i][j] += math.random() * 6 - 3); offset = y * w * 4 + x * 4; pixels[offset+1] = 0x66; pixels[offset+2] = 0x99; pixels[offset+3] = 0xff;

increasing number of generators higher number seems make work.

eg. 50..times(createbubblegenerator); works.

cheers!!!


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