[OpenLayers-Trac] [OpenLayers] #436: Grid not being trimmed to correct size

[OpenLayers]

#436: Grid not being trimmed to correct size
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 Reporter:  openlayers  |        Type:  bug  
   Status:  new         |    Priority:  major
Milestone:              |   Component:  Layer
  Version:              |    Keywords:       
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 [I have set our tile size to 64x64 which is obviously silly for production
 use, but increases the frequency of problems being observed.]

 There seems to be a problem in _initTiles in Grid.js, in that it only
 seems to expand the tile grid as required, rather than trimming it to the
 required size.  There seem to be a number of side effects of this:

 Changing the window size leaves lots of tiles below and to the right of
 the active tiles (panning with the column/row shifts disabled produced
 'outside_box_not_cleared.jpg' (attached).

 It also seems possible to get the grid into a non-rectangular shape by
 starting with a very thin vertical window, then resizing to very thin
 horizontal window.  After scrolling, the rows being shifted in had too few
 columns, and produced 'inverted_L_box.jpg'.

 The third more subtle problem is that when zooming in, the number of tiles
 required to achieve coverage at a particular resolution was changing (in
 my tests, from 17x26, then 16x25, then 17x26).  As it zooms in to the
 smaller size, it leaves a row and column from the old grid, and when
 panning the shiftColumn/Row code looks into those tiles to try to place
 shifted tiles adjacent to them, and gets very confused with the data from
 the previous zoom level.


 [Maybe related to #357]

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Ticket URL: <http://trac.openlayers.org/ticket/436>
OpenLayers <http://openlayers.org/>
A free AJAX map viewer