private void NumericUpDownVx_ValueChanged(object sender, EventArgs e)
    {

    }

    private void NumericUpDownVy_ValueChanged(object sender, EventArgs e)
    {

    }

    private void ButtonStart_Click(object sender, EventArgs e)
    {


        if (buttonStart.Text == "Start")

        {
            numericUpDownVx.Enabled = false;
            numericUpDownVy.Enabled = false;

            buttonStart.Text = "Stop";

            Timer1.Start();

        }


        else if (buttonStart.Text == "Stop")
        {
            numericUpDownVx.Enabled = true;
            numericUpDownVy.Enabled = true;
            buttonStart.Text = "Start";
            Timer1.Stop();
            Timer2.Stop();
            Timer3.Stop();
            Timer4.Stop();
        }
    }

    private void Timer1_Tick(object sender, EventArgs e)
    {
        ball.Top += 5;
        ball.Left += 5;

        if (ball.Left + ball.Width > Mesa.Width)
        {
            Timer1.Stop();
            Timer2.Start();
        }

        if (ball.Top + ball.Height > Mesa.Height)
        {
            Timer1.Stop();
            Timer3.Start();
        }
    }

    private void Timer2_Tick(object sender, EventArgs e)
    {
        ball.Top += 5;
        ball.Left -= 5;

        if (ball.Top + ball.Height > Mesa.Height)
        {
            Timer2.Stop();
            Timer4.Start();
        }

        if (ball.Left < 0)
        {
            Timer2.Stop();
            Timer1.Start();
        }
    }

    private void Timer3_Tick(object sender, EventArgs e)
    {
        ball.Top -= 5;
        ball.Left += 5;

        if (ball.Left + ball.Width > Mesa.Width)
        {
            Timer3.Stop();
            Timer4.Start();
        }

        if (ball.Top < 0)
        {
            Timer3.Stop();
            Timer1.Start();
        }
    }

    private void Timer4_Tick(object sender, EventArgs e)
    {
        ball.Top -= 5;
        ball.Left -= 5;

        if (ball.Left < 0)
        {
            Timer4.Stop();
            Timer3.Start();
        }

        if (ball.Top < 0)
        {
            Timer4.Stop();
            Timer2.Start();
        }
    }