object Mandel {
  val xmin : Double = -2;
  val xmax : Double = 1;
  val ymin : Double = -1;
  val ymax : Double = 1;
  
  def escapes( cr:Double, ci:Double, it:Int ) : Char = {
    var zr, zi, zrtmp : Double = 0;
    for( i <- 1 to it ) {
      zrtmp = zr*zr - zi*zi + cr
      zi = 2*zr*zi + ci
      zr = zrtmp
      if (zr*zr + zi*zi > 4) {
        return ' '
      }
    
    }
    return 'X'
  }

  def main(args: Array[String]): Unit = {
    val xstep = args(0).toInt
    val ystep = args(1).toInt
    val iters = args(2).toInt
    var xc, yc : Int = 0
    var x, y : Double = 0
    
    for( yc <- 0 to ystep-1) {
      y = yc*(ymax-ymin)/ystep + ymin
      for( xc <- 0 to xstep-1) {
        x = xc*(xmax-xmin)/xstep + xmin
        print(escapes(x, y, iters))
      }
      println()
    }
  }
}