PHPMapscriptSnippet1

Here is a code snippet from Antti Roppola, there is also another example in the GMap demo application that is a little fancier (GMap demo http://www2.dmsolutions.ca/gmap/gmap75.phtml download demo: http://dl.maptools.org/dl/).

/**                                                                                                                                                                                                                               
 * converts pixel units into map units                                                                                                                                                                                            
 *                                                                                                                                                                                                                                
 * @param int $click_x coordinate X in pixels                                                                                                                                                                                     
 * @param int $click_y coordinate Y in pixels                                                                                                                                                                                     
 * @param array $current_extent holds the current extent of the map (XMin, YMin, XMax, YMax)                                                                                                                                      
 * @global map object                                                                                                                                                                                                             
 * @return array  [0]=> X in map units; [1]=> Y in map units                                                                                                                                                                      
 */                                                                                                                                                                                                                               
function click2map ($click_x, $click_y, $current_extent) {                                                                                                                                                                        
        global $map;                                                                                                                                                                                                              
                                                                                                                                                                                                                                  
        $x_pct = ($click_x / $map->width);                                                                                                                                                                                        
        $y_pct = 1 - ($click_y / $map->height);                                                                                                                                                                                   
                                                                                                                                                                                                                                  
        $x_map = $current_extent[0] + ( ($current_extent[2] - $current_extent[0]) * $x_pct);                                                                                                                                      
        $y_map = $current_extent[1] + ( ($current_extent[3] - $current_extent[1]) * $y_pct);                                                                                                                                      
                                                                                                                                                                                                                                  
        return array($x_map, $y_map);                                                                                                                                                                                             
}                                                                                                                                                                                                                                 

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