[mapserver-users] help with dynamic layer

Fri Jul 26 08:29:06 PDT 2002

I think there may be a couple of things missing.
I don't see where the "data" value is set for the layer & I don't see
where the addPoint is being done to add the point(s) to the data shapefile
before rendering the layer.
Lowell F.

On Thu, 25 Jul 2002, Dylan Keon wrote:

> Hi,
>
> I'm trying to create a dynamic point layer using PHP Mapscript.  A
> simple query to a Postgres database returns the UTM coordinates.  That
> part works fine.  What isn't working is the rendering of the layer.  I
> read through the various "dynamic layer" posts in the archives, but
> still couldn't figure it out.  This is my first Mapscript attempt :-)
> I'm sure it's a simple error (or errors) on my part.
>
> The PHP code, map file, and error messages are below.  Any tips would be
> great.  Thanks!
>
> Dylan
>
> ###################### PHP and HTML code ######################
> <?php
>
> dl('php_mapscript.so');
>
> // db connect parameters
> $host = "localhost";
> $user = "xxxxx";
> $pass = "xxxxx";
> $db = "xxxxx";
>
> // open a connection to the db server
> $connection = pg_connect("host=$host dbname=$db user=$user password=$pass");
>
> if (!$connection) {
>          die("Could not open connection to database server");
> }
>
> // generate and execute the query
> $query = "SELECT utm_e, utm_n FROM sites";
> $result = pg_exec($connection, $query) or die("Error in query: $query. "
> . pg_last_error($connection));
>
> // get the number of rows in the resultset
> $rows = pg_numrows($result);
>
> // MapObj and ImageObj settings
> $map_path="/www/gis/mapfiles/";
> $map = ms_newMapObj($map_path."test.map");
> $img = $map->prepareImage();
>
> // get dummy layer
> $layer = $map->getLayerByName("sites2");
>
> // loop through resultset, generating points
> for ($i=0; $i<$rows; ++$i) {
>     $row = pg_fetch_row($result, $i);
> // echo "Record $i: UTM_E $row[0], UTM_N $row[1]<br>";
>     $pt = ms_newPointObj();
>     $pt->setXY($row[0],$row[1]);
>     $pt->draw($map, $layer, $img, 0, "TEST");
>     $layer->set('status', MS_ON);
>     $layer->draw($img);
> }
>
> // create web image
> $img=$map->draw();
> $img_url=$img->saveWebImage(MS_PNG,1,1,0);
>
> // close database connection
> pg_close($connection);
>
> ?>
>
> <html>
> <head>
> <title>Test Map</title>
> </head>
> <body>
> <table align="center">
> <tr><td>
> <input type="image" name="test_map" src="<?php echo $img_url?>">
> </td></tr>
> </table>
> </body>
> </html>
> ################################################################
>
> ########################### map file ###########################
> NAME TEST
> SIZE 600 400
> STATUS ON
> SYMBOLSET "/www/gis/symbols/symbols.sym"
> EXTENT 370000 4640000 1011000 5130000 #minx miny maxx maxy
> UNITS METERS
> SHAPEPATH "/usr/local/gis_data/state"
> IMAGETYPE PNG
>
> WEB
>    IMAGEPATH "/www/tmp/"
>    IMAGEURL "/tmp/"
> END
>
> LAYER
>    NAME boundary
>    DATA bnd
>    TYPE polygon
>    STATUS DEFAULT
>    CLASS
>      NAME "State boundary"
>      OUTLINECOLOR 0 0 0
>      COLOR -1 -1 -1
>    END
> END
>
> LAYER
>    NAME sites2
>    TYPE POINT
>    STATUS OFF
>    CLASS
>      COLOR 255 255 0
>      OUTLINECOLOR 0 0 0
>      SYMBOL 7
>      SIZE 8
>    END
> END
>
> END
> ################################################################
>
> ####################### Error messages #########################
> Warning: MapServer Error in msGetBitmapFont(): Invalid bitmap font. Must
> be one of tiny, small, medium, large or giant. in
> /usr/local/etc/httpd/htdocs/test.php on line 47
>
> Fatal error: Call to a member function on a non-object in
> /usr/local/etc/httpd/htdocs/test.php on line 48
> ################################################################
>