How to tile a 30000 x 6000 image for a 480 x 320 screen?

Posted by Horace Ho on Stack Overflow See other posts from Stack Overflow or by Horace Ho
Published on 2010-04-28T01:46:23Z Indexed on 2010/04/28 1:53 UTC
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image-manipulation

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tiles

(this is related to another question about implementation on iPhone)

I have a large image, size around 30000 (w) x 6000 (h) pixels. You may consider it's like a big map. I assume I need to crop it up into smaller tiles. Questions:

what is the tile strategy?

Requirements:

whole image (though cropped) can be scrolled up/down/left/right by swipes
zoom in (up to pixel-to-pixel) out (down to screen-fit-by-height) by the 2-finger operation
memory efficiency by lazy loading tiles

Thanks!

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