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Realtime Image Rotation using C dll
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Rotate a picture at any given angle in realtime. Also scale it, use transparent color, alphablending and hue change. Uses a C dll source included.
For the compiled dll:
http://www2.cs.ucy.ac.cy/~cs06ee1/rotatedll.zip
*UPDATE: 22/7/2010 Fixed memory leak*
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Windows API/Global Declarations: Can't Copy and Paste this?
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'**************************************
'Windows API/Global Declarations for :Realtime Image Rotation using C dll
'**************************************
Private Declare Function rotatedc Lib "rotate.dll" Alias "rotatedc" (ByVal aHDC As Long, ByVal Angle As Single, ByVal X As Long, ByVal Y As Long, ByVal W As Long, ByVal H As Long, ByVal hBitmap As Long, ByVal pScale As Single, ByVal TraspColor As Long, ByVal Alpha As Single) As Long | |
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Other 41 submission(s) by this author
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| Your Vote! |
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| Other User Comments |
 2/25/2007 9:56:54 PM: enmity
http://www.planet-source-code.com/vb/scripts/ShowCode.asp?txtCodeId=11830&lngWId=1
http:/ /www.planet-source-code.com/vb/scripts/ShowCode.asp?txtCodeId=40386&lngWId=1
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2/26/2007 2:24:22 AM: Soorya
can u pls. add compiled dll (diff ext)?
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2/26/2007 10:00:56 AM: Lefteris Eleftheriades
Since the compiled dll got removed from the zip, I gave an external link to the zip file with the dll.
I haven't seen those other submissions mentioned above, but in favour of my submission I have to say, It's clean, fast and standalone just like any windows api
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2/26/2007 1:20:46 PM: Mark
Great job Lefteris! Very fast and smooth. *****
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2/26/2007 1:25:16 PM: Akiti Yadav
Good and Clean Code. I did have to go throught the extra step of downlading dev-C++ and compiling the dll.
Thanks.
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2/26/2007 1:32:36 PM: Akiti Yadav
For certain settings, I do get the following error :
Failed to Get Image DIBits"
VB hangs up after this.You will need to make the code more robust.
cheers
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2/26/2007 3:06:36 PM: LaVolpe
Have you considered encoding for 32bpp images using alpha channel? Reading the .c file it appears your code is similar to TransBlt (. I'm suggesting maybe a combination between TransBlt and AlphaBlend. Additionally, if no TranspColor wanted how would that parameter be passed? P.S. I see some optimizations if you are interested
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2/27/2007 5:46:32 AM: pietro ing. cecchi
unable to download from http://www2.cs.ucy.ac.cy/~cs06ee1/rotatedll.zip
please someone who already downloaded it, send me by email:
pietrocecchi@inwind.it
thanks a lot in advance
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2/27/2007 6:02:52 AM: pietro ing. cecchi
well, I retried and succeded in downloading:
http://www2.cs.ucy.ac.cy/~cs06ee1/rotatedll.zip
thanks anyhow
I still have to see the code and how it works...:)
But I vote 5, because I'm sure is the dll we all needed for real time image rotation...
all the best and thanks again dear Lefteris Eleftheriades!...
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2/27/2007 1:45:48 PM: Agustin Rodriguez
I would like that this was a Default function of VB. It Save a lot of work.
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3/1/2007 6:49:05 AM: pietro ing. cecchi
Dear Lefteris,
this is truly a wonderful control...
and it opes new frontieres in VB programming...:)
Very nice is transparency, also...
best compliments and thank you,
Pietro
http://cecchi.infinito.it
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3/4/2007 8:32:54 AM: Lefteris Eleftheriades
4-Mar-07
updates:
Fixed a memory leek caused by GetDC()
Fixed Saturation and Luminocity
Optimized code for more speed
Corrected minor bug that caused the image to be rotated 1 pixel off the central rotation axis.
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7/22/2010 12:49:17 PM: Warren Goff
I can only get it to work when compiled and not from the IDE as an insertion point cannot be found.
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7/23/2010 1:58:54 PM: Paul Bahlawan
Works good for me in both ide and exe! I'm thinking of combining this and reexre's "Boxs" program to make something...
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