Mandelbrot Worker

mandelbrot_worker.js

function doYLine(screenX, xMax, yMax)
	{
	computedLine = new String ;
	
	computedLine = screenX ;
	
	xZoom = xMax/1000.0/.5 ;
	yZoom = yMax/1000.0/.5 ;
	xThingy = screenX/xMax ;
	
	xOffset = xZoom/4 ;
	yOffset = yZoom/4 ;
	
	for (screenY=0 ; screenY < yMax ; screenY++) {
		x0 = xZoom*xThingy-1 - xOffset ;
		y0 = yZoom*screenY/yMax-1 - yOffset ; 
	
	  x = 0
	  y = 0

	  iteration = 0
	  max_iteration = 50

	  while ( (x*x + y*y <= (2*2))  &&  (iteration < max_iteration) )
	  	{
	    xtemp = x*x - y*y + x0
	    y = 2*x*y + y0

	    x = xtemp

	    iteration = iteration + 1
	  	}

	  if (iteration == max_iteration) {
			computedLine += " rgb(0,0,0)"
			}
		else {
			computedLine += " rgb(" + parseInt((iteration/max_iteration)*255+30) + ",10,10)" ;
			}
	}
	
	return computedLine;
}

onmessage = function(event) {
	m = event.data.split(" ") ;
	
 	line = doYLine(parseInt(m[0]), parseInt(m[1]), parseInt(m[2])) ;
	
	postMessage(line) ;
} ;