Non Rectangular Form

[Sabry1905]

hi all I was making a non rectangular form in C# using a bitmap with a white background and set the transparency key property of the form to white and it works but when I color quality from the system properties to 32bit it didn't work is there any way to overcome this or is there a different method for drawing a non rectangular form using images thx for your interest

[Pablo Hernandez Valdes]

The problem is that you may be using a 24bit image and it has some problems (I don't know why?) with 32bit color quality. Anyway there is a solution for this problem: 1) Load the image manually in the Load event(or wherever you want): Bitmap bg; bg=(Bitmap)Bitmap.FromFile(@"Your image.bmp"); bg.MakeTransparent(Color.White); Instead of this you can use an ImageList and don't forget to set the TransparentColor property 2) Draw the image in the Paint event: private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e) { e.Graphics.DrawImage(bg,0,0,this.Width,this.Height); //If you used an ImageList //e.Graphics.DrawImage(imageList1.Images[backgroundIndex],0,0,this.Width,this.Height); } Another approach to this could be using regions, but it is more complicated, if you want to learn more about this please let me know and I'll try to show you an example Pablo Hernandez Valdes

[Sabry1905]

Hi Pablo Hernandez Many thx for your efforts to help me and others, i had used the code that u send to me and it didnt work see the code Bitmap bg; private void Form1_Load(object sender, System.EventArgs e) { bg=(Bitmap)Bitmap.FromFile(@"C:\Documents and Settings\sabry\Desktop\tt.bmp"); bg.MakeTransparent(Color.White); } private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e) { e.Graphics.DrawImage(bg,0,0,this.Width,this.Height); } and also i changed the transparency color to white i want to know why it didn't work in all color qualities and i want to know about the other methods again many thx :)

[Pablo Hernandez Valdes]

Maybe it didn't work because the BackColor must be set to the color you want to make transparent, if not it does nothing at all. In my computer it works fine with this. If it still doesn't work please tell me and I'll try to send you my full code. If you want to do something like this using regions, for example, if you want a triangular window you can do System.Drawing.Drawing2D.GraphicsPath gp=new System.Drawing.Drawing2D.GraphicsPath(new Point[]{new Point(0,0),new Point(200,0),new Point(100,200)},new byte[]{(byte)PathPointType.Start,(byte)PathPointType.Line,(byte)PathPointType.Line}); this.Region=new Region(gp); Now you get a triangular window. You can intersect, join, complement different regions to obtain more complex shapes and even use non polygonal regions with bezier curves (PathPointType.Bezier). With a litte effort you can make a region that conform to your bitmap and use it for the form. Any problems please let me know. Pablo Hernandez Valdes

[Sabry1905]

see this it works greet :) another good one like u helped me to do it public Form1() { InitializeComponent(); Bitmap Img = new System.Drawing.Bitmap(@"C:\myPic.bmp"); Img.MakeTransparent(Img.GetPixel(1,1)); this.BackgroundImage = Img; this.TransparencyKey = Img.GetPixel(1,1); } thx for ur interest :)