ASP.NET 绘图

private void DrawPic(int[] arr, int n, string heroname)
    {
        Bitmap bitmap = new Bitmap(1080, 600);
        Graphics graphics;

        graphics = Graphics.FromImage(bitmap);

        graphics.Clear(Color.White);

        graphics.DrawRectangle(Pens.Black, 50, 50, 1000, 500);

        graphics.DrawString(heroname + "英雄分布", new Font("宋体", 16, FontStyle.Bold), Brushes.Black, new PointF(450,70));

        //最大的值

        int max_value = arr[500];
        int total_value = arr[501];


        graphics.DrawString("总样本点个数:" + total_value.ToString(), new Font("宋体", 11, FontStyle.Bold), Brushes.Blue, 800, 400);

        //纵坐标标识

        int step = 0;
        if (max_value > 10)
        {
            step = max_value / 10;
        }
        else
        {
            step = 1;
        }
        for (int i = 0; i <= 10; ++i)
        {
            graphics.DrawLine(new Pen(Color.Blue, 1), 50, 550 - 50 * i, 60, 550 - 50 * i);
            graphics.DrawString((step * i).ToString(), new Font("宋体", 10), Brushes.Black, 52, 536 - 50 * i);
        }

        graphics.DrawString("玩家数", new Font("宋体", 11), Brushes.Black, 30, 15);

        //横坐标标识

        for (int i = 0; i <= 10; ++i)
        {
            graphics.DrawLine(new Pen(Color.Blue, 1), 50 + 100 * i, 550, 50 + 100 * i , 540);
            graphics.DrawString((50 * i).ToString(), new Font("宋体", 10), Brushes.Black, 40 + 100 * i, 560);
        }

        graphics.DrawString("水平值", new Font("宋体", 11), Brushes.Black, 480, 580);

        //柱状图(线）


        for (int i = 0; i < 500; ++i)
        {
            if (arr[i] != 0)
            {
                graphics.DrawLine(new Pen(Color.Red, 2), 50 + 2 * i, 550, 50 + 2 * i, 550 - (arr[i] * 500) / max_value);
            }
        }

         bitmap.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Gif);
    }