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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Hi Pg,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I was very impressed by your work to
implement overlays from xml data. If you will release the next version i am
ready to test it </span></font><font size=2 color=navy face=Wingdings><span
style='font-size:10.0pt;font-family:Wingdings;color:navy'>J</span></font><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Will you implement the drawing on the client
side? Is it browser dependent?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Best Regards,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Tamas Szekeres<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Pg
[mailto:pg.navone@gmail.com] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, May 30, 2006 9:34
PM<br>
<b><span style='font-weight:bold'>To:</span></b> Tamas Szekeres<br>
<b><span style='font-weight:bold'>Cc:</span></b>
ka-map-users@lists.maptools.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [ka-Map-users]
kaXmlOverlay performance problem</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>What you describe is one
of the well known issues of kaXmlOverlay.<br>
An alternative overlay solution, with tiling for big images, has been provided
by Lorenzo Becchi & Andrea Cappugi (kaOverlay.js and related files). <br>
<br>
I will release in a short time a new implementatio of kaXmlOverlay using vector
graphics (<canvas> or VML) to draw lines and polygons.<br>
This isn't the definive solution for your problem, but can help.<br>
<br>
-Pg<o:p></o:p></span></font></p>
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<p class=MsoNormal><span class=gmailquote><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>2006/5/30, Tamas Szekeres <<a
href="mailto:szekerest@gmail.com">szekerest@gmail.com</a>>:</span></font></span><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Hi list,<br>
<br>
The current implementation of rendering linestrings and polygons use<br>
the drawgeom.php (AFAIK).<br>
The size of the generated overlay image highly depends on the current<br>
scale of the map. When zooming in the image size may be extremely <br>
large that increases the download time and the memory usage of the<br>
browser.<br>
<br>
I think this type of the overlay rendering should be reconsidered so<br>
as drawgeom should render only a smaller visible segment of the image <br>
and a new drawing request should be submitted when the user recenters<br>
the map outside of that image area.<br>
<br>
Any comments would be appreciated.<br>
<br>
Best Regards,<br>
<br>
Tamas Szekeres<br>
_______________________________________________ <br>
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<a href="http://lists.maptools.org/mailman/listinfo/ka-map-users">http://lists.maptools.org/mailman/listinfo/ka-map-users
</a><o:p></o:p></span></font></p>
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<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'><o:p> </o:p></span></font></p>
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