Bitmap Drawline

class Bitmap

  def draw_line(x1,y1,x2,y2,color = Color.new(255,255,255))
    jarak_x = (x2-x1).abs
    jarak_y = (y2-y1).abs
    if jarak_y == 0 || jarak_x == 0
      draw_horz(x1,y1,jarak_x,color) if jarak_y == 0
      draw_vert(x1,y1,jarak_y,color) if jarak_x == 0
      return
    end
    maximum = [jarak_x,jarak_y].max
    rasio_x = jarak_x / maximum.to_f
    rasio_y = jarak_y / maximum.to_f
    real_x = x1.to_f
    real_y = y1.to_f
    for i in 0..maximum
      fill_rect(x1,y1,1,1,color)
      real_x += rasio_x
      real_y += rasio_y
      x1 = real_x.round
      y1 = real_y.round
    end
  end

  def draw_horz(x,y,width,color = Color.new(255,255,255))
    fill_rect(x,y,width,1,color)
  end

  def draw_vert(x,y,height,color = Color.new(255,255,255))
    fill_rect(x,y,1,height,color)
  end

end