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panAndZoomTo a defined zoom level
HI,
I need to be able to pan and zoom a bit like the panAndZoomBy function does but would like to be able to zoom to a chosen zoomLevel.
let's say my map goes from 4 to 7 as zoomLevels I need to able to let's say panAndZoomTo zoom 5, and then go further to say zoom 7.
is it possible to do this in modestmaps? I have been looking at the various zoom and pan functions but can't find one that would take the user to a defined zoom level.
any pointers on how to do this?
thanks in advance
I need to be able to pan and zoom a bit like the panAndZoomBy function does but would like to be able to zoom to a chosen zoomLevel.
let's say my map goes from 4 to 7 as zoomLevels I need to able to let's say panAndZoomTo zoom 5, and then go further to say zoom 7.
is it possible to do this in modestmaps? I have been looking at the various zoom and pan functions but can't find one that would take the user to a defined zoom level.
any pointers on how to do this?
thanks in advance
I’m undecided
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Inappropriate?anybody?? -
Inappropriate?Are you asking how to perform a sequence of pans and zooms?
e.g. animate pan-and-zoom to a location at zoom level 15, THEN zoom in to zoom level 12?
Otherwise, I think map.panAndZoomBy should do what you want, e.g. to zoom in by 3 zoom levels and move the given location to the center of the map you would do:
var location:Location = new Location(...);
var center:Point = new Point(map.getWidth()/2, map.getHeight()/2);
var currentZoom:Number = map.getZoom();
var targetZoom:Number = currentZoom + 3;
var sc:Number = Math.pow(2, targetZoom - currentZoom);
map.panAndZoomBy(sc, location, center):void
If you use TweenMap this should animate... I'm sorry about the confusion between scale and zoomLevel in this function. -
Inappropriate?hey thanks for the answer, I didn't get an email about it and I just found it now.
that helped although I am still confused.
let's say I want to panAndZoomBy from any given zoom to let's say zoom 12 so I could be at zoomLevel 9 or 10 or whatever else and I need to panAndZoomBy to zoom 12 at a given location.
how do I calculate sc?
thanks for your help.
Luigi
I’m confused
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Inappropriate?The scale value is always as I have it above:
var sc:Number = Math.pow(2, targetZoom - currentZoom);
This works for zooming in and zooming out. (e.g. 2 to the power -1 is 0.5, so everything will be half the size if you zoom out by -1).
This method really should have used zoom levels and not scale values, but the calculation above is all you need.
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