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C#

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    static void CreateBitMap2()
    {
        int width = 1000;
        int height = 1000;
        int cell = 100;

        using (Bitmap bmp = new Bitmap(width, height))
        using (Graphics g = Graphics.FromImage(bmp))
        {
            g.Clear(Color.White);

            // =========================
            // 100pxチェッカーパターン
            // =========================
            for (int y = 0; y < height; y += cell)
            {
                for (int x = 0; x < width; x += cell)
                {
                    bool dark = ((x / cell) + (y / cell)) % 2 == 0;

                    Brush brush = dark
                        ? new SolidBrush(Color.FromArgb(235, 235, 235))
                        : new SolidBrush(Color.FromArgb(210, 210, 210));

                    g.FillRectangle(brush, x, y, cell, cell);
                }
            }

            // =========================
            // 10pxグリッド
            // =========================
            using (Pen pen10 = new Pen(Color.Gray, 1))
            {
                for (int x = 0; x < width; x += 10)
                    g.DrawLine(pen10, x, 0, x, height);

                for (int y = 0; y < height; y += 10)
                    g.DrawLine(pen10, 0, y, width, y);
            }

            // =========================
            // 100pxグリッド
            // =========================
            using (Pen pen100 = new Pen(Color.Red, 2))
            {
                for (int x = 0; x < width; x += 100)
                    g.DrawLine(pen100, x, 0, x, height);

                for (int y = 0; y < height; y += 100)
                    g.DrawLine(pen100, 0, y, width, y);
            }

            // =========================
            // 座標表示
            // =========================
            using (Font font = new Font("Arial", 12))
            {
                for (int x = 0; x < width; x += 100)
                {
                    g.DrawString($"x={x}", font, Brushes.Blue, x + 5, 5);
                }

                for (int y = 0; y < height; y += 100)
                {
                    g.DrawString($"y={y}", font, Brushes.Green, 5, y + 5);
                }
            }

            // =========================
            // 交点マーカー
            // =========================
            for (int y = 0; y < height; y += 100)
            {
                for (int x = 0; x < width; x += 100)
                {
                    g.FillEllipse(Brushes.Red, x - 3, y - 3, 6, 6);
                }
            }

            bmp.Save("debug_test_image.png", ImageFormat.Png);
        }

        Console.WriteLine("デバッグ画像生成完了");
    }