draw random graphical images in c# windows application

hi friend,

Please do mark my answer it'll help me get some point when you get help then please do favor to mark as answer.

Best Regards

            Thanks.............................

hi friend,

you have to customize the code some what by urself.. on selected index changed event of Dropdown you can provide the seed for random no.

and generate random no. for near range of the selected points. i hope  your problem will get solved.

hi,


i need to change points position based on selected value from dropdownlist..

hi friend,

Try following code  i have commented where to generate the pixels and where to generate circle but both are random to fill the all image area.

    Graphics xGraph;
        int k;
        int r;     
        int x, y;  
        Bitmap DrawArea;
        DrawArea = new Bitmap(Width,Height,System.Drawing.Imaging.PixelFormat.Format24bppRgb);
        // Creating points on Bitmap
        for (int x = 0; x < Width; x++)
        {
            for (int y = 0; y < Height; y++)
            {
                int num = r.Next(0, 256);
                DrawArea.SetPixel(x, y, Color.FromArgb(255, num, num, num));
            }
        }


        xGraph = Graphics.FromImage(DrawArea);

        Random rnd = new Random((int)DateTime.Now.Ticks); // seeded with ticks
        Pen myPen = new Pen(Color.Red);
        // Drawing random circles in the bitmap image area
        for (k = 1; k < 40; k++)
        {
          myPen.Color = Color.FromArgb(
          (rnd.Next(0, 255)),
          (rnd.Next(0, 255)),
          (rnd.Next(0, 255)));

            r = rnd.Next(0, (this.Width / 2));
            x = rnd.Next(0, this.Width);
            y = rnd.Next(0, this.Height);
       
            xGraph.DrawEllipse(myPen, x - r, y - r, r, r);   
        }

        xGraph.DrawImage(DrawArea, 0, 0, DrawArea.Width, DrawArea.Height);
        // or you can save it to your storage disk.
        DrawArea.Save("C:\\abc.bmp");
        xGraph.Dispose();
        DrawArea.Dispose();


Hope it helps you.

Don't forget to mark as answer.

hi,
  
   like points ,and circles ..but the position of points should change based on the input

hi friend,

are you trying to made some captcha control type of thing?? what kind of graphical shapes you want to draw??