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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Hi Guys,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Whilst we’re on the subject I have also been working
on a point collision system, except I’m using addObjectGeo() to lay down
the marker instead of any of the XML related methods. I have the script working
fine and it behaves in the same way as flickr ( <a href="http://flickr.com/map/">http://flickr.com/map/</a>
) with discs of relative sizes which show the number of points within. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>To break it down each time a marker is placed it loops
through each already placed marker stored in a makers array to test for collision
based on pixel distance using “var distance =
Math.sqrt(Math.pow((Math.pow((thisNodeLeft - otherNodeLeft),2) +
Math.pow((thisNodeTop - otherNodeTop),2)),1));”, this system works great
for around 50 markers but often my apps will place 500+ makers which runs just
fine until I collision check them as the loop just becomes huge and obviously
causes the browser to hang.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>To counter this I made SQL output the markers in order of
their X coordinate then instead of checking every marker, I just check against
the last 10 markers to me drawn and the last 10 will generally be the closest
ones as the X positions will all be similar if they are colliding, this method
works 99% of the time at scales where the marker density is not too high, but
clearly wouldn’t work as it does with flickr when zoomed right out so the
density is extremely high and the disks can contain 100+ markers, I would like
to be able to achieve this effect but just can’t think of a way that is
both dynamic and not going to bring the server or the client to a crawl.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I don’t need code, just some inspiration on how to
achieve this, all ideas and suggestions welcome!<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Cheers,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Chris<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoAutoSig><font size=1 color=navy face=Arial><span style='font-size:
8.0pt;font-family:Arial;color:navy'>~~~~~~~~~~~~~~~~~~~~~~~~~~~<o:p></o:p></span></font></p>
<p class=MsoAutoSig><font size=1 color=navy face=Arial><span style='font-size:
8.0pt;font-family:Arial;color:navy'>Christopher Brown<o:p></o:p></span></font></p>
<p class=MsoAutoSig><font size=1 color=navy face=Arial><span style='font-size:
8.0pt;font-family:Arial;color:navy'>Head of Internet Development<o:p></o:p></span></font></p>
<p class=MsoAutoSig><font size=1 color=navy face=Arial><span style='font-size:
8.0pt;font-family:Arial;color:navy'>Base Bloc <st1:country-region w:st="on"><st1:place
w:st="on">Cambodia</st1:place></st1:country-region><o:p></o:p></span></font></p>
<p class=MsoAutoSig><font size=1 color=navy face=Arial><span style='font-size:
8.0pt;font-family:Arial;color:navy'>#33, 123, <st1:place w:st="on"><st1:City
w:st="on">Phnom Penh</st1:City>, <st1:country-region w:st="on">Cambodia</st1:country-region></st1:place>.
<o:p></o:p></span></font></p>
<p class=MsoAutoSig><st1:address w:st="on"><st1:Street w:st="on"><font size=1
color=navy face=Arial><span style='font-size:8.0pt;font-family:Arial;
color:navy'>P.O. Box</span></font></st1:Street><font size=1 color=navy
face=Arial><span style='font-size:8.0pt;font-family:Arial;color:navy'> 2086</span></font></st1:address><font
size=1 color=navy face=Arial><span style='font-size:8.0pt;font-family:Arial;
color:navy'><o:p></o:p></span></font></p>
<p class=MsoAutoSig><font size=1 color=navy face=Arial><span style='font-size:
8.0pt;font-family:Arial;color:navy'>www.basebloc.com<o:p></o:p></span></font></p>
<p class=MsoAutoSig><font size=1 color=navy face=Arial><span style='font-size:
8.0pt;font-family:Arial;color:navy'>Mobile (+855) 12 315 302</span></font><o:p></o:p></p>
<p class=MsoAutoSig><font size=1 color=navy face=Arial><span style='font-size:
8.0pt;font-family:Arial;color:navy'>Office (+855) 23 222 015<o:p></o:p></span></font></p>
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