On Nov 29, 6:58 am, Chad Killingsworth
<[email protected]> wrote:
> For my v3 project, I needed a tile layer overlay. Since one didn't
> exist, I wrote my own. I see questions about tile layers popping up
> somewhat regularly, so I figured I'd share my class for others to use.
>
> Tile Layer
> Script:http://search.missouristate.edu/map/mobile/examples/tileoverlay.js
>
> Example
> Usage:http://search.missouristate.edu/map/mobile/examples/tileoverlay.htm
>
> I fully expect (or maybe just hope) this class to be obsolete soon as
> I anticipate that tile layer functionality will be part of the v3 api.
>
> Chad Killingsworth
Another option:
www.polyarc.us/sparsetile.js
www.polyarc.us/sparse
www.polyarc.us/road
www.polyarc.us/rail
It detects IE6 which requires AlphaImageLoader to display transparent
PNGs.
It compensates for getBounds errors at low numbered zoom levels for
which map wraping occurs, typically, just 0 & 1 unless the screen is
very large.
It adjusts out of range tile numbers near the International Date Line.
A single "Sparse Tile Layer Overlay" can handle multiple tile sets
without redundant OverlayViews with their redundant event listeners.
It is mapserver friendly. The "height" & "width" & "bbox" values
expected by mapserver are available to the "setUrl" method. The
traditional "x" & "y" & "z" tile values are also available to the
"setUrl" method.
xy.x = tile X offset
xy.y = tile Y offset
xy.X = tile width
xy.Y = tile height
xy.x0 = begin longitude
xy.y0 = begin latitude
xy.x1 = end longitude
xy.y1 = end latitude
It too is a stopgap unless the ability to manage multiple tile sets in
a single OverlayView is useful.
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