printscreen a panel control

Question

Hi im doing a paint program and it all works perfectly except for the save image thingy... i got this code but it just saves the control without the graphics i paint on top (with pen): any ideas? pls? ImageFormat img; Bitmap bt; Graphics screenShot; private void button1_Click(object sender EventArgs e) { if (saveFileDialog1.ShowDialog() == DialogResult.OK) { img = ImageFormat.Jpeg; bt = new Bitmap(panel1.Width panel1.Height PixelFormat.Format16bppGrayScale); screenShot = Graphics.FromImage(bt); screenShot.CopyFromScreen(panel1.Location.X panel1.Location.Y panel1.Width panel1.Height panel1.Bounds.Size CopyPixelOperation.SourceCopy); } bt.Save(saveFileDialog1.FileName img); }

Frogleg · Answer

1: Create a bitmap to draw on for saving 2:Draw a white background to draw your lines on 3: The program runs thru the _lines collection and draws lines to coodinates and color 4:Your lines coordinates are stored in a new class called lines which is created when the mouse button is released and added to a list of classes _lines 5:You can sort through that list to delete any line To simplify -think of the line class as a one page of a book that is created on the fly You can access or delete any page as you wish Research - List of

Amit Ziv · Answer

Hi tnx for the help but i cant really understand the file saving method. can u explain your code?

Frogleg · Answer

You will find if you drag something over or minimize your form the graphics will disappear Even though I used panel_create graphics it is only a temp dwg check this out - save as jpg print preview and undo function

Amit Ziv · Answer

The paint graphics is going like that: Pen p = new Pen(Brushes.Black); Point start = new Point(0 0); Point end = new Point(0 0); bool drawing = false; Graphics g; private void panel1_MouseMove(object sender MouseEventArgs e) { if (drawing == true) { end = e.Location; g = panel1.CreateGraphics(); g.DrawLine(p start end); } start = end; } private void panel1_MouseUp(object sender MouseEventArgs e) { drawing = false; } private void panel1_MouseDown(object sender MouseEventArgs e) { start = e.Location; if (e.Button == MouseButtons.Left) { drawing = true; } }

Frogleg · Answer

How are you drawing on the panel ? - Show more code