Steve,
I will add all the remaining geos support in PHP sometime next week.
Steve Lime wrote:
Julien: The dev version of MapServer (which is quite stable) now has full
support for GEOS operators in MapScript including a getArea() method. However,
I don't know that Assefa has gotten around to adding them to PHP/MapScript. As
far as I know the getArea method is planar...
There is a distanceToPoint method for point objects I believe but again it is
doing a simple planar distance computation.
Steve
Julien Bessiere <[EMAIL PROTECTED]> 07/18/06 8:12 AM >>>
Hi,
I'm using phpMapscript / Mapserver.
I wrote a little script that allows users to draw polygons on the map. I try to
figure out how to calculate the area of this polygon, but so far...
I found a formula and wrote the script below but as i'm using decimal latitude
and longitude, the result is unusable :
So my questions is :
1- Does phpmapscript has a function to calculate area
(something like distanceToPoint(pointObj poPoint))?
2- If no, how to calculate area wiht lat long coordinates?
thanks for your advices,
Julien
============================================================
function polygonArea($polygon_coordinates){
$array_length = count($polygon_coordinates);
if ($array_length > 2){
// add the first coordinates at the end to close de polygon
array_push($polygon_coordinates,array($polygon_coordinates[0][0],$polygon_coordinates[0][1]));
$polygon_area = 0;
for ($i=0;$i <= $array_length;$i++){
$polygon_area += (
($polygon_coordinates[$i][0] *
$polygon_coordinates[$i+1][1])-
($polygon_coordinates[$i][1] *
$polygon_coordinates[$i+1][0]));
}
$polygon_area = abs($polygon_area / 2);
}
else {
$polygon_area = 'need at least 3 points';
}
return $polygon_area;
}
=====================================================================
--
----------------------------------------------------------------
Assefa Yewondwossen
Software Analyst
Email: [EMAIL PROTECTED]
http://www.dmsolutions.ca/
Phone: (613) 565-5056 (ext 14)
Fax: (613) 565-0925
----------------------------------------------------------------
