Hello there,
after a few days of browsing this huge group, I give up. I've found
some solutions, some of them worked, others were useless for me. The
goal would be:
 - I have a route (polyline), which I convert to encoded
 - There are some bus stops (markers) on the route
 - From these I have the bounding box, but without any calculating
Static Maps shows me the content well, on the corresponding zoom level
and centered for the content. So no problem at this point.
But! Since this application is produced for mobile users, the map
could be pretty small (I think, I will create the minimum size about
at 120x160 pixels), so I would like to enable the users to zoom the
content. After zooming they need paging as well to the four direction.
For this function I need to know:
 - the center of the content (no problem)
 - the zoom level for the whole content
 - the LatLng size of the image on the actual zoom level (to step the
center for paging).

Could You help me? The algorythms I've found here are not similar to
each other and ones are more complicated than the others. I've got
almost the good results when I used Mike's two simple rows (360
degrees are 256*(2^x), where x is the zoom level), but it fails
sometimes one level...

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