Keeping the draw on an image

[utkuozan]

I am currently placing a "+" sign on a picture previously loaded in a
PictureBox by coding these below in an OnMouseDown event.

System.Drawing.Graphics formGraphics = PictureBox.CreateGraphics ( );
string drawString = "+";
System.Drawing.Font drawFont = new System.Drawing.Font("Arial", 16);
System.Drawing.SolidBrush drawBrush = new
System.Drawing.SolidBrush(System.Drawing.Color.Bla ck);
float x = e.X - 10;
float y = e.Y - 10;
formGraphics.DrawString(drawString, drawFont, drawBrush, x, y);
drawFont.Dispose();
drawBrush.Dispose();
formGraphics.Dispose();
isPlacing = false;
PictureBox.Cursor = Cursors.Default;
PlaceObjButton.Enabled = false;
Up to this point everything is fine. But when I bring another running window
front and then return my software back I see that the mark is gone. How can I
keep the mark until I want to delete it?
--
Utku Ozan ÇANKAYA

[James Jenkins]

"utkuozan" <ut******@discussions.microsoft.com> wrote in message
news:C0**********************************@microsof t.com...

I am currently placing a "+" sign on a picture previously loaded in a
PictureBox by coding these below in an OnMouseDown event.

System.Drawing.Graphics formGraphics = PictureBox.CreateGraphics ( );
string drawString = "+";
System.Drawing.Font drawFont = new System.Drawing.Font("Arial", 16);
System.Drawing.SolidBrush drawBrush = new
System.Drawing.SolidBrush(System.Drawing.Color.Bla ck);
float x = e.X - 10;
float y = e.Y - 10;
formGraphics.DrawString(drawString, drawFont, drawBrush, x, y);
drawFont.Dispose();
drawBrush.Dispose();
formGraphics.Dispose();
isPlacing = false;
PictureBox.Cursor = Cursors.Default;
PlaceObjButton.Enabled = false;
Up to this point everything is fine. But when I bring another running
window
front and then return my software back I see that the mark is gone. How
can I
keep the mark until I want to delete it?
--
Utku Ozan ÇANKAYA

Hi Utku,
You need to do all your drawings in the onpaint event - then from a
method you would call invalidate as it changes -

James Jenkins
www.tamarsolutions.co.uk

[Bob Powell [MVP]]

See the GDI+ FAQ for why using CreateGraphics will cause you nothing but
pain, how to draw on an image and how to correctly use the PictureBox.

--
Bob Powell [MVP]
Visual C#, System.Drawing

Ramuseco Limited .NET consulting
http://www.ramuseco.com

Find great Windows Forms articles in Windows Forms Tips and Tricks
http://www.bobpowell.net/tipstricks.htm

Answer those GDI+ questions with the GDI+ FAQ
http://www.bobpowell.net/faqmain.htm

All new articles provide code in C# and VB.NET.
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"utkuozan" <ut******@discussions.microsoft.com> wrote in message
news:C0**********************************@microsof t.com...

I am currently placing a "+" sign on a picture previously loaded in a
PictureBox by coding these below in an OnMouseDown event.

System.Drawing.Graphics formGraphics = PictureBox.CreateGraphics ( );
string drawString = "+";
System.Drawing.Font drawFont = new System.Drawing.Font("Arial", 16);
System.Drawing.SolidBrush drawBrush = new
System.Drawing.SolidBrush(System.Drawing.Color.Bla ck);
float x = e.X - 10;
float y = e.Y - 10;
formGraphics.DrawString(drawString, drawFont, drawBrush, x, y);
drawFont.Dispose();
drawBrush.Dispose();
formGraphics.Dispose();
isPlacing = false;
PictureBox.Cursor = Cursors.Default;
PlaceObjButton.Enabled = false;
Up to this point everything is fine. But when I bring another running
window
front and then return my software back I see that the mark is gone. How
can I
keep the mark until I want to delete it?
--
Utku Ozan ÇANKAYA