PHPMapScriptAddPoint

This is a simple example of how to use PHPMapScript. It is intended to be for begginers (as me). We are going to add a point on the position the user clicked on a map.

On our !MapFile, we have blank Point layer called "INLINE", This is the layer where we are going to add our dynamic point. Here you have a sample:

  LAYER                                                                                                                                                                
    NAME "INLINE"                                                                                                                                                      
    TYPE POINT                                                                                                                                                         
    STATUS ON                                                                                                                                                          
   CLASS                                                                                                                                                               
       NAME "0"                                                                                                                                                        
       STYLE                                                                                                                                                           
         COLOR 255 0 0 # red                                                                                                                                           
         MAXSIZE 300 # default 50                                                                                                                                      
         SYMBOL 'phone' #In my case was a nice phone image symbol                                                                                                      
         SIZE 16                                                                                                                                                       
       END #style                                                                                                                                                      
   END #class                                                                                                                                                          
 END #layer                                                                                                                                                            

= PHP code =

The source filename is query2.php

<?php                                                                                                                                                                  
                                                                                                                                                                       
//Load the dynamic library.                                                                                                                                            
dl('php_mapscript.so');                                                                                                                                                
//dl('php_mapscript_42.dll'); //For WinDoS Users                                                                                                                       
                                                                                                                                                                       
//Convert pixels to map units (got from PHPMapscriptSnippet1)                                                                                                          
function click2map ($click_x, $click_y) {                                                                                                                              
    global $map;                                                                                                                                                       
    $e= &$map->extent; //for saving writing                                                                                                                            
    $x_pct = ($click_x / $map->width);                                                                                                                                 
    $y_pct = 1 - ($click_y / $map->height);                                                                                                                            
    $x_map = $e->minx + ( ($e->maxx - $e->minx) * $x_pct);                                                                                                             
    $y_map = $e->miny + ( ($e->maxy - $e->miny) * $y_pct);                                                                                                             
                                                                                                                                                                       
    return array($x_map, $y_map);                                                                                                                                      
}                                                                                                                                                                      
                                                                                                                                                                       
$map= ms_newMapObj('data/test2.map');                                                                                                                                  
//Convert pixels to map units                                                                                                                                          
$map_pt = click2map($_GET['image_x'],$_GET['image_y'],$map->extent);                                                                                                   
//Create the point                                                                                                                                                     
$pt = ms_newPointObj();                                                                                                                                                
$pt-> setXY($map_pt[0],$map_pt[1]);                                                                                                                                    
                                                                                                                                                                       
//Draw the map and add the point                                                                                                                                       
$img = $map->draw();                                                                                                                                                   
$layer = $map->getLayerByName('INLINE');                                                                                                                               
$pt->draw($map, $layer, $img, 0 ,'yuhuu');                                                                                                                             
$url = $img->saveWebImage();                                                                                                                                           
?>                                                                                                                                                                     
                                                                                                                                                                       
< html>< head></ head>< body>                                                                                                                                          
                                                                                                                                                                       
<form method="get" action="query2.php" >                                                                                                                               
   <input style="border:thin solid black;" type="image"                                                                                                                
          name="image" src="<?php echo $url?>" />                                                                                                                      
</form>                                                                                                                                                                
                                                                                                                                                                       
< pre>                                                                                                                                                                 
<!-- Debug Lines -->                                                                                                                                                   
<?php                                                                                                                                                                  
echo "GET\n";                                                                                                                                                          
print_r($_GET);                                                                                                                                                        
echo "Point:\n";                                                                                                                                                       
print_r($pt); ?>                                                                                                                                                       
?>                                                                                                                                                                     
< /pre>                                                                                                                                                                
< /body>                                                                                                                                                               
< /html>                                                                                                                                                               

-- Merlos

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