printscreen a panel control

Amit Ziv

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);

}

5 Replies

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Frogleg12y ago
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 Ziv12y ago
Hi, tnx for the help but i cant really understand the file saving method.
can u explain your code?
Frogleg12y ago
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 Ziv12y ago
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;
}
}
Frogleg12y ago
How are you drawing on the panel ? - Show more code