using ExtFloodFill from GDI

[pixel]

hi

i know there is no ExtFloodFill in GDI+
so i decided to use GDI
but there is something that i don't understand

when i got DC from ie PictureBox
like this
Graphics g = PictureBox.CreateGraphics();
IntPtr hdc = g.GetHdc();

then ExtFloodFill on this hdc works perfectly ok

but when i got hdc from bitmap
like this
Image i = new Bitmap(100, 100);
Graphics g = Graphics.FromImage(i);
IntPtr hdc = g.GetHdc();

then ExtFloodFill fills whole bitmap

ofcourse on both graphics there is circle or something like this!!!

and ofcourse other GDI functions work on both hdc
ie SetPixel or Rectangle works perfectly ok
so why ExtFloodFill has different products???

br
pixel

[Dmitriy Lapshin [C# / .NET MVP]]

Hi!

A blind guess - possible differences in the pixel format due to which
ExtFloodFill fails to 'see' the circle's (or something else's) border.

--
Sincerely,
Dmitriy Lapshin [C# / .NET MVP]
Bring the power of unit testing to the VS .NET IDE today!
http://www.x-unity.net/teststudio.aspx

"pixel" <pi****@poczta.onet.pl> wrote in message
news:cc**********@nettle.mcnet.pl...

hi

i know there is no ExtFloodFill in GDI+
so i decided to use GDI
but there is something that i don't understand

when i got DC from ie PictureBox
like this
Graphics g = PictureBox.CreateGraphics();
IntPtr hdc = g.GetHdc();

then ExtFloodFill on this hdc works perfectly ok

but when i got hdc from bitmap
like this
Image i = new Bitmap(100, 100);
Graphics g = Graphics.FromImage(i);
IntPtr hdc = g.GetHdc();

then ExtFloodFill fills whole bitmap

ofcourse on both graphics there is circle or something like this!!!

and ofcourse other GDI functions work on both hdc
ie SetPixel or Rectangle works perfectly ok
so why ExtFloodFill has different products???

br
pixel

[pixel]

hi dimitriy

i also thought so
so i did
compatible dc from pixturebox
and compatible bitmap into this dc

and unfortunatelly it still doesn't work :(((

i have no more ideas

pixel

"Dmitriy Lapshin [C# / .NET MVP]" <x-****@no-spam-please.hotpop.com> wrote in message
news:#R**************@TK2MSFTNGP11.phx.gbl...

Hi!

A blind guess - possible differences in the pixel format due to which
ExtFloodFill fails to 'see' the circle's (or something else's) border.

--
Sincerely,
Dmitriy Lapshin [C# / .NET MVP]
Bring the power of unit testing to the VS .NET IDE today!
http://www.x-unity.net/teststudio.aspx

"pixel" <pi****@poczta.onet.pl> wrote in message
news:cc**********@nettle.mcnet.pl...

hi

i know there is no ExtFloodFill in GDI+
so i decided to use GDI
but there is something that i don't understand

when i got DC from ie PictureBox
like this
Graphics g = PictureBox.CreateGraphics();
IntPtr hdc = g.GetHdc();

then ExtFloodFill on this hdc works perfectly ok

but when i got hdc from bitmap
like this
Image i = new Bitmap(100, 100);
Graphics g = Graphics.FromImage(i);
IntPtr hdc = g.GetHdc();

then ExtFloodFill fills whole bitmap

ofcourse on both graphics there is circle or something like this!!!

and ofcourse other GDI functions work on both hdc
ie SetPixel or Rectangle works perfectly ok
so why ExtFloodFill has different products???

br
pixel