Hi, I read some similar questions here, this is a bit different.

I need to zoom to a specific point, e.g. when clicking on a class I would like the zoom to be centered on the center of that class. More in general, to any point.

I guess something like "zoomTo(scale, point)" which either change the translation or moves the scrollbars.. I don't know.

Any suggestion on the computations this method should perform?

Thanks, -s

asked 14 Apr '12, 06:51

fusio's gravatar image

fusio
91211
accept rate: 11%


Sort of solved:

  1. take the point (screen coordinate) before scaling
  2. scale
  3. take the point (screen coordinate) after scaling
  4. compute delta of points
  5. set scroll to: oldScroll+(delta*scale)

Not sure if this is the best way to do it, but it seems to act ok.

link

answered 16 Apr '12, 11:51

fusio's gravatar image

fusio
91211
accept rate: 11%

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Asked: 14 Apr '12, 06:51

Seen: 2,540 times

Last updated: 16 Apr '12, 11:51