[OpenLayers-Trac] [OpenLayers] #1124: FixedZoomLevels.js doesn't properly set the resolutions array

OpenLayers trac at openlayers.org
Thu Nov 29 16:52:28 EST 2007


#1124: FixedZoomLevels.js doesn't properly set the resolutions array
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  Reporter:  elemoine               |       Owner:  elemoine   
      Type:  bug                    |      Status:  new        
  Priority:  major                  |   Milestone:  2.6 Release
 Component:  Layer.FixedZoomLevels  |     Version:  SVN        
Resolution:                         |    Keywords:  review     
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Comment (by tschaub):

 Thought I could give a quick review, but I'm confused by two things:

 1) Why do we have MIN_ZOOM_LEVEL, MAX_ZOOM_LEVEL, and RESOLUTIONS?  Is
 MAX_ZOOM_LEVEL ever different than MIN_ZOOM_LEVEL + RESOLUTIONS.length -
 1?  If not, why not dispense with MAX_ZOOM_LEVEL entirely.  And then,
 isn't MIN_ZOOM_LEVEL really about a zoomOffset?  Like, in OL we use 0
 based zoom, but somewhere else they use 1 based zooms - so we always want
 to add 1.  Maybe this is way off - I'm just confused why we can't just use
 resolutions.  Since maintaining zoom number when switching layers has no
 meaning, I like the idea of keeping resolution constant.  Maybe this is
 happening and I just need a lesson on fixed zoom levels.

 2) Why is the MAX_ZOOM_LEVEL 17 for VirtualEarth while there are only 16
 items in RESOLUTIONS?  Again, probably my lack of understanding on this
 fixed stuff, but I'm curious.

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Ticket URL: <http://trac.openlayers.org/ticket/1124#comment:3>
OpenLayers <http://openlayers.org/>
A free AJAX map viewer


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