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From: Mark Rae [MVP] on 6 Oct 2009 08:12
"Alberto" <alberto(a)nospam.es> wrote in message
news:CC939097-E6D6-47D6-A673-DC89D55AE31D(a)microsoft.com...

[please don't top-post]

>>> Could you tell me how to save in jpg instead than a bmp?
>>
>> Bitmap bitMap = new Bitmap(panel.Width, panel.Height);
>> panel.DrawToBitmap(bitMap, new Rectangle(0, 0, panel.Width,
>> panel.Height));
>> bitMap.Save(saveFileDialog.FileName,
>> System.Drawing.Imaging.ImageFormat.Jpeg);
>
> Do you know why the lines that I draw with DrawLine aren't saved in the
> file?

Not without seeing your code...


--
Mark Rae
ASP.NET MVP
http://www.markrae.net

From: Alberto on 6 Oct 2009 13:55
I just wrote in another proyect this code:

private void button5_Click(object sender, EventArgs e)

{

Graphics g = panel1.CreateGraphics();

g.DrawLine(new Pen(Brushes.Blue), new Point(0, 0), new Point(50, 50));

}

private void button4_Click(object sender, EventArgs e)

{

int width = panel1.Width;

int height = panel1.Height;

Bitmap bitMap = new Bitmap(width, height);

Rectangle rec = new Rectangle(0, 0, width, height);

panel1.DrawToBitmap(bitMap, rec);

bitMap.Save(@"C:/Windows/prueba.bmp");

}

The problem is the same. The line didn't appear in the file stored.

Thank you for your help

"Mark Rae [MVP]" <mark(a)markNOSPAMrae.net> escribi� en el mensaje
news:OshcG5nRKHA.4504(a)TK2MSFTNGP04.phx.gbl...
> "Alberto" <alberto(a)nospam.es> wrote in message
> news:CC939097-E6D6-47D6-A673-DC89D55AE31D(a)microsoft.com...
>
> [please don't top-post]
>
>>>> Could you tell me how to save in jpg instead than a bmp?
>>>
>>> Bitmap bitMap = new Bitmap(panel.Width, panel.Height);
>>> panel.DrawToBitmap(bitMap, new Rectangle(0, 0, panel.Width,
>>> panel.Height));
>>> bitMap.Save(saveFileDialog.FileName,
>>> System.Drawing.Imaging.ImageFormat.Jpeg);
>>
>> Do you know why the lines that I draw with DrawLine aren't saved in the
>> file?
>
> Not without seeing your code...
>
>
> --
> Mark Rae
> ASP.NET MVP
> http://www.markrae.net


From: Jeff Gaines on 6 Oct 2009 18:14
On 06/10/2009 in message <e9L#O4qRKHA.220(a)TK2MSFTNGP02.phx.gbl> Alberto
wrote:

>The problem is the same. The line didn't appear in the file stored.

Does the order of clicking the buttons (4 & 5) affect what is saved? It
may be that the Button 4 click function over-writes what was drawn in the
Button 5 click function.

--
Jeff Gaines Dorset UK
All those who believe in psychokinesis raise my hand.
From: Alberto on 6 Oct 2009 18:24
The code of the button4 doesn't delete the graphic area of the panel. If I
draw the line in the panel Paint event, the results are the same.
"Jeff Gaines" <jgaines_newsid(a)yahoo.co.uk> escribi� en el mensaje de
noticias news:xn0gg3e1b1texf3001(a)msnews.microsoft.com...
> On 06/10/2009 in message <e9L#O4qRKHA.220(a)TK2MSFTNGP02.phx.gbl> Alberto
> wrote:
>
>>The problem is the same. The line didn't appear in the file stored.
>
> Does the order of clicking the buttons (4 & 5) affect what is saved? It
> may be that the Button 4 click function over-writes what was drawn in the
> Button 5 click function.
>
> --
> Jeff Gaines Dorset UK
> All those who believe in psychokinesis raise my hand.

From: kndg on 6 Oct 2009 20:06
Alberto wrote:
> I just wrote in another proyect this code:
>
> private void button5_Click(object sender, EventArgs e)
>
> {
>
> Graphics g = panel1.CreateGraphics();
>
> g.DrawLine(new Pen(Brushes.Blue), new Point(0, 0), new Point(50, 50));
>
> }
>
> private void button4_Click(object sender, EventArgs e)
>
> {
>
> int width = panel1.Width;
>
> int height = panel1.Height;
>
> Bitmap bitMap = new Bitmap(width, height);
>
> Rectangle rec = new Rectangle(0, 0, width, height);
>
> panel1.DrawToBitmap(bitMap, rec);
>
> bitMap.Save(@"C:/Windows/prueba.bmp");
>
> }
>
> The problem is the same. The line didn't appear in the file stored.
>
> Thank you for your help
>
> "Mark Rae [MVP]" <mark(a)markNOSPAMrae.net> escribi� en el mensaje
> news:OshcG5nRKHA.4504(a)TK2MSFTNGP04.phx.gbl...
>> "Alberto" <alberto(a)nospam.es> wrote in message
>> news:CC939097-E6D6-47D6-A673-DC89D55AE31D(a)microsoft.com...
>>
>> [please don't top-post]
>>
>>>>> Could you tell me how to save in jpg instead than a bmp?
>>>> Bitmap bitMap = new Bitmap(panel.Width, panel.Height);
>>>> panel.DrawToBitmap(bitMap, new Rectangle(0, 0, panel.Width,
>>>> panel.Height));
>>>> bitMap.Save(saveFileDialog.FileName,
>>>> System.Drawing.Imaging.ImageFormat.Jpeg);
>>> Do you know why the lines that I draw with DrawLine aren't saved in the
>>> file?
>> Not without seeing your code...
>>
>>
>> --
>> Mark Rae
>> ASP.NET MVP
>> http://www.markrae.net
>
>

Hi Alberto,

You should put your drawing operation on panel1 on Paint event handler.

Example:
1. double-click panel1 control on the designer
2. add below code on panel1_Paint method

private void panel1_Paint(object sender, PaintEventArgs e)
{
Graphics g = e.Graphics;

g.DrawLine(new Pen(Brushes.Blue), new Point(0, 0), new Point(50, 50));
}

Regards.
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