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Re: Animated GIF
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Re: Animated GIF

  • Subject: Re: Animated GIF
  • From: Sam McCandlish <email@hidden>
  • Date: Sun, 22 Feb 2004 20:27:08 -0500
So does this mean I should:
- Make an NSBitmapImageRep
- Set the current frame
- Set other properties for the frame
- Draw the frame
- Repeat the last three steps until finished
- Write the NSBitmapImageRep to a file

Have I got this right?

Thanks!
Sam

On Feb 22, 2004, at 6:20 PM, Jens Bauer wrote:

Hi Sam,

On Sunday, Feb 22, 2004, at 23:43 Europe/Copenhagen, Sam McCandlish wrote:

Is there a way to make an animated gif in Cocoa? If possible can you make it using an NSImage?

Searching this archive (recent), I found this by Troy Stephens:

---8<-----8<-----8<-----
Does anyone know if it is possible to 'run' an animated gif without the need for an NSImageView to contain it ? Or in the least be able to test the gif image data to see if it contains animations or a single frame ?

Yes. Once you've got the .gif loaded as an NSImage, search the NSImage for an NSBitmapImageRep, then refer to the animated GIF properties listed in the NSBitmapImageRep docs:

http://developer.apple.com/documentation/Cocoa/Reference/ ApplicationKit/ObjC_classic/Classes/NSBitmapImageRep.html#//apple_ref/ occ/cl/NSBitmapImageRep

NSImageFrameCount tells you how many frames there are in the animation. NSImageLoop count tells you whether the animation should be looped, and, if so, how many times. Set NSImageCurrentFrame to the index of a desired frame to cause it to be the frame you get when you next draw the image. Add an NSTimer to the mix and you're ready to animate! :-) (NSImageCurrentFrameDuration tells you how long the current frame should be displayed.)
--->8----->8----->8-----


Love,
Jens
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References: 
 >Re: Animated GIF (From: Jens Bauer <email@hidden>)

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