sample code for generaing bar charts using asp net c sharp

• Posted by Admin on March 8, 2009
• 88 comments

This is a sample code that generates random height bar chart. To generate chart according to your data you need to change the rnd.Next(280) field of the code.

            System.Drawing.Bitmap b = new System.Drawing.Bitmap(730, 300);

            for (int i = 0; i < b.Width; i++)
            {
                for (int j = 0; j < b.Height; j++)
                {
                    b.SetPixel(i, j, System.Drawing.Color.FromArgb(216, 216, 216));
                }

            }
            Random rnd = new Random(10);

            int BarCount = 0;


            for (int i = 0; i < b.Width; i++)
            {
                b.SetPixel(i, 0, System.Drawing.Color.YellowGreen);
                b.SetPixel(i, 50, System.Drawing.Color.YellowGreen);
                b.SetPixel(i, 100, System.Drawing.Color.YellowGreen);
                b.SetPixel(i, 150, System.Drawing.Color.YellowGreen);
                b.SetPixel(i, 200, System.Drawing.Color.YellowGreen);
                b.SetPixel(i, 250, System.Drawing.Color.YellowGreen);

            }

            for (int i = 20; i < b.Width; i = i + 30)
            {
                BarCount++;
                if (BarCount == 25)
                {
                    break;
                }
                for (int j = rnd.Next(280); j < b.Height; j++)
                {

                    b.SetPixel(i + 9, j, System.Drawing.Color.Green);
                    b.SetPixel(i + 8, j, System.Drawing.Color.Green);
                    b.SetPixel(i + 7, j, System.Drawing.Color.Green);
                    b.SetPixel(i + 6, j, System.Drawing.Color.Green);
                    b.SetPixel(i + 5, j, System.Drawing.Color.Green);
                    b.SetPixel(i + 4, j, System.Drawing.Color.Green);
                    b.SetPixel(i + 3, j, System.Drawing.Color.Green);
                    b.SetPixel(i + 2, j, System.Drawing.Color.Green);
                    b.SetPixel(i + 1, j, System.Drawing.Color.Green);
                    b.SetPixel(i, j, System.Drawing.Color.Green);


                }

            }

            for (int i = 0; i < 1; i++)
            {
                for (int j = 0; j < b.Height; j++)
                {
                    b.SetPixel(i, j, System.Drawing.Color.Black);
                }

            }
            for (int i = 0; i < b.Width; i++)
            {
                for (int j = b.Height - 1; j < b.Height; j++)
                {
                    b.SetPixel(i, j, System.Drawing.Color.Black);
                }

            }

            b.Save(Server.MapPath("") + "\\Temp.jpg", System.Drawing.Imaging.ImageFormat.Jpeg);

            ImageMap1.ImageUrl = "Temp.jpg";