Add a point dynamically to a layer in PHPMapscript 4.2

#Add a dynamic point to a layer

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>

< pre> <?php echo “GET\n”; print_r($_GET); echo “Point:\n”; print_r($pt); ?> ?> < /pre> < /body>