Hi all, Beginning the review of the great code already written to handle the google-like popups, I figured out that there was many different thing addressed there. In the code graciously provided by Tim Coulter (and written with the help of many other guys), different features are mixed and I think this would be better if we get into trunk one at a time.
One first functionnality I found was the map slide. This is specifically used to get the popup entirely visible but this smooth panning thing is something many people has been asking for for long [1]. I worked on this and I want to propose what follows. First, I imagined having a panTo method allow user to pan to a new given center. Like in google API, I wanted this pan to be smooth only if the new center is in the current visible extent. (quite easy). For the transition effect, I relied on the Robert Penner's famous Tween and Easing algorithms. Given an easing mode (linear, exponential ...), two objects (from and to) with one or more properties, a time interval and a number of steps, it returns intermediate objects with updated properties. This transition handler is imagined to be used for different purposes. For example, it could also be used to manage the popup size update. Paul (and other folks) are probably interested in testing it for the transition zoom effect. This might simplify code. An working example is already available [3]. I'm looking for feedbacks. Regards, Pierre [1] http://trac.openlayers.org/ticket/110 [2] http://www.robertpenner.com/easing/ [3] http://dev.openlayers.org/sandbox/camptocamp/panto/examples/tween.html _______________________________________________ Dev mailing list [email protected] http://openlayers.org/mailman/listinfo/dev
