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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>To Paul / rest of the devs, what’s your thoughts on adding
transparency to the tiles and allowing tile/layer overlays? I see you have
commented out the following, so you may be already looking at this?</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> // TODO: We don't
need transparency for now</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> //$oMap->outputformat->set("transparent",
MS_ON );</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Im looking at instead of creating the tiled images based on
all layers in the map file, I would add a new config switch to specify
particular layers that you wish to split into separate tiles. Ideally, this
would allow particular layers in the map to be toggled on/off and be moved hierarchically
all on the client side.</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Advantages:</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt;text-indent:-18.0pt'><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>-<font size=1
face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font></span></font><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'>Complete client side transparency / z-index position
using CSS / DOM / JS</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt;text-indent:-18.0pt'><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>-<font size=1
face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font></span></font><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'>Same benefits with cached tiles but further
functionality</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt;text-indent:-18.0pt'><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>-<font size=1
face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font></span></font><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'>Remove reliance on the server regenerating images to
perform simple layer ordering functions</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt;text-indent:-18.0pt'><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>-<font size=1
face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font></span></font><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'>Will suit the planned cache refresh function seen on bugzilla.
If a layer data source is updated, only related layer images need to be
flushed, not everything.</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Disadvantages:</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt;text-indent:-18.0pt'><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>-<font size=1
face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font></span></font><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'>Cross browser support issues</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt;text-indent:-18.0pt'><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>-<font size=1
face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font></span></font><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'>Integration with current code would require directory
and tile algorithm change</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt;text-indent:-18.0pt'><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>-<font size=1
face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font></span></font><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'>Annotation clashes due to the images being created independently.
ie. labels and symbols may become illegible</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt;text-indent:-18.0pt'><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>-<font size=1
face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font></span></font><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'>Increased overhead downloading images</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>While the download overhead may be significant depending on the
number of images you wish to overlay, typically you’d limit the amount of
layers available to be moved/turned off. However as the xmlhttprequest handles
concurrent downloading of images, I’d expect most users will not notice
the increased data as they can continue to zoom/pan.</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Thoughts/Opinions? Thought I’d throw the idea out
there and gauge a response. Afterall, no point reinventing the wheel </span></font><font
size=2 face=Wingdings><span style='font-size:10.0pt;font-family:Wingdings'>J</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=1 color=black face=Arial><span style='font-size:
7.5pt;font-family:Arial;color:black'>---------------------------------------------------------------------------</span></font></p>
<p class=MsoNormal><strong><b><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'>Chris Tweedie</span></font></b></strong></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Technical Officer</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Shared Land Services</span></font></p>
<p class=MsoNormal><font size=1 face=Arial><span style='font-size:7.5pt;
font-family:Arial'>Department of Land Information</span></font></p>
<p class=MsoNormal><font size=1 face=Arial><span style='font-size:7.5pt;
font-family:Arial'>1 Midland Square</span></font><font size=1 face=Arial><span
style='font-size:7.5pt;font-family:Arial'>, </span></font><font size=1
face=Arial><span style='font-size:7.5pt;font-family:Arial'>Midland</span></font><font
size=1 face=Arial><span style='font-size:7.5pt;font-family:Arial'>, </span></font><font
size=1 face=Arial><span style='font-size:7.5pt;font-family:Arial'>Western
Australia</span></font><font size=1 face=Arial><span style='font-size:7.5pt;
font-family:Arial'> 6056</span></font></p>
<p class=MsoNormal><font size=1 face=Arial><span style='font-size:7.5pt;
font-family:Arial'>PO Box 2222</span></font><font size=1 face=Arial><span
style='font-size:7.5pt;font-family:Arial'> </span></font><font size=1
face=Arial><span style='font-size:7.5pt;font-family:Arial'>Midland</span></font><font
size=1 face=Arial><span style='font-size:7.5pt;font-family:Arial'> 6936</span></font></p>
<p class=MsoNormal><font size=1 face=Arial><span style='font-size:7.5pt;
font-family:Arial'>Telephone: (08) 9273 7520 Facsimile (08) 9273 7638</span></font></p>
<p class=MsoNormal><font size=1 face=Arial><span style='font-size:7.5pt;
font-family:Arial'>Email: </span></font><font face=Arial><span
style='font-family:Arial'><a href="mailto:chris.tweedie@dli.wa.gov.au"><font
size=1><span style='font-size:7.5pt'>chris.tweedie@dli.wa.gov.au</span></font></a></span></font></p>
<p class=MsoNormal><font size=1 face=Arial><span style='font-size:7.5pt;
font-family:Arial'>Website: </span></font><font face=Arial><span
style='font-family:Arial'><a href="http://www.dli.wa.gov.au"><font size=1><span
style='font-size:7.5pt'>www.dli.wa.gov.au</span></font></a></span></font></p>
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