Circlebar Control

[fearless]

A circular progress bar control with source, 1 example and chm help file.



Playing around with gdi+ stuff recently and for some reason i ended up creating this. I had tried to create a version where the center part was completely transparent, (i did get a gdi version to work with transparentblt but that the gdi version did not have any anti-aliasing, and still looked a bit rough when rendering at a higher image size and stretchblt back to smaller size), and cpu usage goes up a bit when moving mouse over the window (higher cpu usage if you have a gaming mouse with higher polling rate probably due to increased wm_mousemove messages). Also you might have to right click, properties, unblock, on the chm for it to show properly. Another thing that bothered me slightly was the way i created the control - still not sure im doing that right :D

Anyhows here it is, maybe someone will find it, or the code useful.

[qWord]

One small issue is that your WndProc does not preserve EBX as required by the WinABI. Otherwise it look goods 

BTW: WM_NCCREATE is might not be the first message send to a window (AFAICS this is not a problem for your control). For that reason I prefer the method of a wrapper-WndProc that does manage the memory of the window/control-data and pass the pointer through EBX or an additional parameter to the actual procedure. As long as the private data is not allocated, the wrapper call the default window procedure.

[Gunther]

Hi fearless,

Looks good. 

Gunther

[faiseur]

Good work Fearless 

[Biterider]

Nice stuff 
Biterider

[guga]

Crashing on winxp SP3

The crash is at CbarGdiDrawDisplayText
in the 1st GdipDrawString here

Code: [Select]

        mov eax, MarkerNo
       
        .IF eax == 0
            Invoke GdipDrawString, pGraphics, Addr szWZero, 0ffffffffh, pFont, Addr gdirect, pFormat, pBrush

http://www.jose.it-berater.org/smfforum/index.php?topic=1826.0
http://www.masmforum.com/board/index.php?PHPSESSID=786dd40408172108b65a5a36b09c88c0&topic=11385.0
http://msdn.microsoft.com/en-us/library/windows/desktop/ms534053%28v=vs.85%29.aspx


http://www.wasm.ru/forum/viewtopic.php?id=45877

[fearless]

I copied the circlebarexample1 to my old asus n10 netbook (winxp pro sp3 with an intel atom cpu), and it runs without crashing, altho the desktop and other screens flicker and the cpu goes mad. I can only think it is something to do with the gdiplus version on xp vs win7 x64 maybe. Tbh i never tested it on the netbook before as i hardly ever use it.
I done a search of gdiplus on my netbook and my main pc (win7 x64) and took screenshots of the files listed, altho im not sure it will help at all, but i suppose its a place to start.

[guga]

The problem seems to be that pFont is returning 0-1, causing GdipDrawString to crash

It is retrning 0-1, because at GdipCreateFont it returns 2 (which i suppose is an error case), when it should return 0
http://source.winehq.org/WineAPI/GdipCreateFont.html
http://www.news2news.com/vfp/?function=805

Since GdipCreateFont return error on the 1st time it is being used, i presume the error is at the function CbarGdiInit

[fearless]

Might be coz i have specified Segoe UI as the font to use, which according to the wikipedia entry http://en.wikipedia.org/wiki/Segoe is on windows 7 upwards and can be available on winxp if particular software applications are installed. Might have to set it as arial or something and recompile it.

Change these lines in the source:

Code: [Select]

szDefaultFont           db "Segoe UI",0
szWDefaultFont        db "S",0,"e",0,"g",0,"o",0,"e",0," ",0,"U",0,"I",0,0,0

[guga]

Indeed

Changing it to times new roman, worked correctly :)

Very nice example of using gdi+, btw