Create a red color with an alpha component then draw a red circle to the bitmap in memory : Bitmap « 2D Graphics « C# / C Sharp

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C# / C Sharp » 2D Graphics » Bitmap Screenshots  Create a red color with an alpha component then draw a red circle to the bitmap in memory    using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; public class Form1 : Form {     protected override void OnPaint(PaintEventArgs e) {     Graphics gForm = e.Graphics;     gForm.FillRectangle(Brushes.White, this.ClientRectangle);     for (int i = 1; i <= 7; ++i)     {       Rectangle r = new Rectangle(i * 40 - 15, 0, 15,this.ClientRectangle.Height);       gForm.FillRectangle(Brushes.Orange, r);     }     Bitmap bmp = new Bitmap(260, 260,System.Drawing.Imaging.PixelFormat.Format32bppArgb);     Graphics gBmp = Graphics.FromImage(bmp);     Color red = Color.FromArgb(0x60, 0xff, 0, 0);     Brush redBrush = new SolidBrush(red);     gBmp.FillEllipse(redBrush, 70, 70, 160, 160);     gForm.DrawImage(bmp, 20, 20, bmp.Width, bmp.Height);     bmp.Dispose();     gBmp.Dispose();     redBrush.Dispose();     }     public static void Main() {         Application.Run(new Form1());     } }        Related examples in the same category 1. Draw on an Bitmap 2. Resize the Bitmap using the lowest quality interpolation mode 3. Resize the Bitmap using the highest quality interpolation mode 4. Create Graphics object From Image 5. Bitmap.SetResolution 6. Bitmap property: Height, Physical Dimension, width, raw format and size 7. Create your own BitMap 8. Draw shapes to the bitmap in memory 9. new Bitmap(bitmap, size) 10. Read Bitmap Size by using BinaryReader 11. Bitmap.HorizontalResolution 12. Use a color matrix to change the color properties of the image 13. Create a Bitmap image in memory and set its CompositingMode 14. Create a green color with an alpha component then draw a green rectangle to the bitmap in memory 15. write the pixel information to the console window 16. Double buffer with Bitmap 17. Draw an array of images 18. Bit operation with PixelFormat.Alpha 19. PixelFormat.DontCare 20. Scale Bitmap By Percent