private void button3_Click(object sender, EventArgs e)
{
    //显示按钮
    var data = textBox2.Text.Select(x => x == '1').Concat(Enumerable.Repeat(false, 256))
        .Take(256).ToArray();
    Graphics g = pictureBox1.CreateGraphics();

    for (int i = 0; i < 16; i++)
    {
        for (int j = 0; j < 16; j++)
        {
            Brush brush = data[j * 16 + i] ? Brushes.Blue : Brushes.White;
            g.FillRectangle(brush, new Rectangle() { X = i * 16, Y = j * 16, Width = 16, Height = 16 });
        }
    }
}

private void button1_Click(object sender, EventArgs e)
{
    //字体设置
    FontDialog fd = new FontDialog() { Font = textBox1.Font, FontMustExist = true };
    if (fd.ShowDialog() == System.Windows.Forms.DialogResult.OK)
    {
        textBox1.Font = fd.Font;
    }
}

private void button2_Click(object sender, EventArgs e)
{
    //产生字模
    Bitmap bmp = new Bitmap(16, 16);
    Graphics g = Graphics.FromImage(bmp);
    g.FillRectangle(Brushes.White, new Rectangle() { X = 0, Y = 0, Height = 16, Width = 16 });
    g.DrawString(textBox1.Text, textBox1.Font, Brushes.Black, new PointF() { X = Convert.ToSingle(domainUpDown1.Text), Y = Convert.ToSingle(domainUpDown2.Text) });
    textBox2.Text = string.Join("", Enumerable.Range(0, 256).Select(a => new { x = a % 16, y = a / 16 })
        .Select(x => bmp.GetPixel(x.x, x.y).GetBrightness() > 0.5f ? "0" : "1"));
    button3.PerformClick();
}

private void textBox1_TextChanged(object sender, EventArgs e)
{
    //输入文字的文本框
    textBox1.Text = textBox1.Text.Length > 0 ? textBox1.Text.Substring(textBox1.Text.Length - 1) : "";
    textBox1.SelectionStart = textBox1.Text.Length;
}

private void domainUpDown1_SelectedItemChanged(object sender, EventArgs e)
{
    //微调，用来设置偏移
    button2.PerformClick();
}

private void domainUpDown2_SelectedItemChanged(object sender, EventArgs e)
{
    button2.PerformClick();
}

// 修改字体
private void button1_Click(object sender, EventArgs e)
{
    if (fontDialog1.ShowDialog() == DialogResult.OK)
        textBox1.Font = fontDialog1.Font;
}

// 生成字模
private void button2_Click(object sender, EventArgs e)
{
    if (string.IsNullOrEmpty(textBox1.Text))
        return;

    Bitmap bmp = new Bitmap(1