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@aikar aikar/gist:492757
Created Jul 27, 2010

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$distance = distance($src['lat'], $src['lng'], $dest['lat'], $dest['lng']);
$angle = getangle($src['lat'], $src['lng'], $dest['lat'], $dest['lng']);
$headdist = max($diststance * .95, $distance - .01);
$head = circle::getLatLngByAngle($src, $angle, $distance + $radius);
$srcleft = circle::getLatLngByAngle($src, $angle - 90, $radius);
$srcright = circle::getLatLngByAngle($src, $angle + 90, $radius);
$headleft = circle::getLatLngByAngle($srcleft, $angle, $headdist);
$headright = circle::getLatLngByAngle($srcright, $angle, $headdist);
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