The spectrogram works by having a circular buffer of smaller tiles. The latest update patches the right-most visible column of the right-most tile. If his tile is "full" then one of the earlier tiles (now offscreen) is pull to the front of the buffer, and the process repeats, starting with the first column of the new tile. So there is never any need to roll any individual tile ever.
FWIW I think this kind of thing is useful when it is useful But, I also think it is:
* fairly complicated
* somewhat specialized
* has a lot of similar but not identical requirements in different cases
So offhand my thoughts would be that this is probably something that is better/easier to maintain as an example (possibly with some convenience functions) that people can use as a base of inspiration, than as built in feature that tries to cover all the different possibilities. But, I also might be overthinking more than you have in mind, so I don't mean to discourage any concrete proposals (just the more fleshed out/detailed the better).
On Jun 15, 2017, at 10:10, Marcus Donnelly <[email protected]> wrote:
Thanks Bryan. Using the patch method, wouldn't it be necessary to do numpy.roll on the whole image as well as updating the new row or column? If so, is that any more efficient than just resending the entire image? I thought that in the Spectrogram example, the equivalent of numpy.roll was done on the JS side (though I'm not sure about that - please tell me if I'm wrong!) The numpy.roll method is very fast on your new patch_app example, but I guess that's only doing a few columns instead of the whole image.
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