[mapserver-users] need help getting pan button in php to work

[Joe Nannery]

Hey all,

I am new to working with phpmapscript...i've used the PHPMapscript example at mapserver.gis.umn.edu, and have found a code snippet for an arrow (function panarrow()), however when i try to get it to work with an input button in html the map just refreshes itself.  what changes should I make?  thanks.

<?php

dl('php_mapscript.dll');

$val_zsize=3;
$check_pan="CHECKED";
$map_path="c:/ms4w/apache/htdocs/geog490/";
$map_file="terrehaute.map";

$map = ms_newMapObj($map_path.$map_file);


if ( isset($HTTP_POST_VARS["mapa_x"]) && isset($HTTP_POST_VARS["mapa_y"])
      && !isset($HTTP_POST_VARS["full"]) ) {

      $extent_to_set = explode(" ",$HTTP_POST_VARS["extent"]); 

      $map->setextent($extent_to_set[0],$extent_to_set[1],
                      $extent_to_set[2],$extent_to_set[3]);

      $my_point = ms_newpointObj();
      $my_point->setXY($HTTP_POST_VARS["mapa_x"],$HTTP_POST_VARS["mapa_y"]);

      $my_extent = ms_newrectObj();

      $my_extent->setextent($extent_to_set[0],$extent_to_set[1],
                              $extent_to_set[2],$extent_to_set[3]);

      $zoom_factor = $HTTP_POST_VARS["zoom"]*$HTTP_POST_VARS["zsize"];
      if ($zoom_factor == 0) {
              $zoom_factor = 1;
              $check_pan = "CHECKED";
              $check_zout = "";
              $check_zin = "";
      } else if ($zoom_factor < 0) {
              $check_pan = "";
              $check_zout = "CHECKED";
              $check_zin = "";
      } else {
              $check_pan = "";
              $check_zout = "";
              $check_zin = "CHECKED";
      }

      $val_zsize = abs($zoom_factor);

      $map->zoompoint($zoom_factor,$my_point,$map->width,$map->height,
                      $my_extent);

}
function panarrow ($map, $HTTP_POST_VARS) {
    
    $xmax = intval($HTTP_POST_VARS["maxx"]);     // E
    $xmin = intval($HTTP_POST_VARS["minx"]);     // W
    $xinc = ($maxx - $minx ) / 5;     // pan-factor
    $ymax = intval($HTTP_POST_VARS["maxy"]);     // S
    $ymin = intval($HTTP_POST_VARS["miny"]);    // N
    $yinc = ($maxy - $miny ) / 5;    // pan-factor 

    // which button is pressed
    if ( isset($HTTP_POST_VARS["panN_x"])) {
        $map->setextent( $minx, ($miny + $yinc), $maxx, ($maxy +$yinc));
            }
    elseif ( isset($HTTP_POST_VARS["panS_x"])) {
        $map->setextent( $minx, ($miny - $yinc), $maxx, ($maxy - $yinc));
            }
    elseif ( isset($HTTP_POST_VARS["panW_x"])) {
        $map->setextent( ($minx - $xinc), $miny, ($maxx - $xinc),$maxy);
            }
    elseif ( isset($HTTP_POST_VARS["panE_x"])) {
        $map->setextent( ($minx + $xinc), $miny, ($maxx + $xinc),$maxy);
            }
}


$image=$map->draw();
$image_url=$image->saveWebImage();

$extent_to_html = $map->extent->minx." ".$map->extent->miny." "
              .$map->extent->maxx." ".$map->extent->maxy;
//////////////////here's the html where I bring up the arrow:
<tr><td>Pan North</td>
     <td><input type="submit" name="pan north" value="pan north" <?php echo $panN?> ></td></tr>

Joe Nannery
Joealan at sbcglobal.net





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