C# と VB.NET の質問掲示板

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using System;
using System.Windows.Forms;

namespace Metronome {
  public partial class Form1 : Form {
    public Form1() { InitializeComponent(); }
    // comboBox1 : rythm選択 (2,3,...10)
    // numericUpDown : tempo設定 (1,2,...,200)
    // timer1 : 定周期タイマ
    private int rythm;
    private int tempo;
    private int count;       // label4に↓コレを書く(リズムに合わせて)
    private string[] marks = { "●○○○○○○○○○○",
                               "○●○○○○○○○○○",
                               "○○●○○○○○○○○",
                               "○○○●○○○○○○○",
                               "○○○○●○○○○○○",
                               "○○○○○●○○○○○",
                               "○○○○○○●○○○○",
                               "○○○○○○○●○○○",
                               "○○○○○○○○●○○",
                               "○○○○○○○○○●○",
                               "○○○○○○○○○○●",
                             };

    private void Form1_Load(object sender, EventArgs e) {
      comboBox1.SelectedIndex = 0;
      rythm = 2;
      numericUpDown1.Value = 60;
      tempo = 60;
      timer1.Interval = 60000 / tempo;
      count = 0;
    }

    private void numericUpDown1_ValueChanged(object sender, EventArgs e) {
      tempo = (int)numericUpDown1.Value;
      timer1.Interval = 60000 / tempo;
    }

    private void comboBox1_SelectedIndexChanged(object sender, EventArgs e) {
      rythm = comboBox1.SelectedIndex + 2;
    }

    private void timer1_Tick(object sender, EventArgs e) {
      count = (count + 1) % rythm;
      label4.Text = marks[count].Substring(0, rythm);
    }
  }
}