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GTK+ Forums
Discussion forum for GTK+ and Programming. Ask questions, troubleshoot problems, view and post example code, or express your opinions.
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ldavies
Familiar Face
Joined: 12 May 2008
Posts: 10
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 Posted: Tue May 13, 2008 4:07 pm Post subject: image transitions (still Noobie) |
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Hi Everyone,
I'm currently developing a slide show program using GTK. I'm trying to create some transitional effects between images.
After some digging I found the gdk_window_clear_area() function, which clears an area of window to the background pixmap.
If I use two planes (current & background), I could load a new image to the background, then remove the current image using the gdk_window_clear_area() function. The wipe down effect would be something like -
| Quote: | for (y = 0 ; i < ymax ; y++)
{
gdk_window_clear_area ( window, 0, y, xmax, 1 ) ;
<some delay>
}
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I'm struggling at the first hurdle loading the "current & background" images. Is there a simple snippet somebody could point me to?
Regards,
Lee |
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Micah Carrick
Never Seen the Sunlight
Joined: 21 Sep 2005
Posts: 505
Location: Portland, OR USA
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| Posted: Tue May 13, 2008 4:40 pm Post subject: |
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Not really my area of expertise... but upon first thought I would think for a sort of "wipe" effect you could use gdk_pixbuf_copy_area () to copy the new image onto the old image one rectangle at a time, say 10 pixels high and all the way across. The function that does this could run every 100 milliseconds or so using g_timeout_add().
Just an idea.
If you intend to get really fancy, you could use another library, like GraphicsMagick (a fork of ImageMagick) http://www.graphicsmagick.org/ |
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