if mb = 1 and mx >= 50 and mx <= 100 and my >= 50 and my <= 100 then
        currentTool := "pencil"
        size1 := 1
        size2 := 1
    elsif currentTool = "pencil" and mb = 1 and pen = 0 and mx >= 330 and mx <= 880 and my >= 65 and my <= 460 then
        drawdot (mx, my, col)
        pen := 1
        oldx := mx
        oldy := my
    elsif mb = 1 and pen = 1 and currentTool = "pencil" and mx >= 330 and mx <= 880 and my >= 65 and my <= 460 then
        drawdot (mx, my, col)
        drawline (mx, my, oldx, oldy, col)
        oldx := mx
        oldy := my
    elsif mb = 0 and pen = 1 and currentTool = "pencil" and mx >= 330 and mx <= 880 and my >= 65 and my <= 460 then
        pen := 0