[mapserver-users] zoom in problem, PHP, winnt

Wed Apr 17 11:50:41 EDT 2002

Hi,
 I have been starting to use php/mapscript and have had some success although right now I have a frustrating problem with the following code.  I took the php/mapscript example that uses a map of Europe and I substituted my own map of Canada, in decimal degrees.  The pan and zoom out work fine, but the zoom in results in my browser just sitting there spinning its wheels.  In my map file, the extent is set to: EXTENT -145.0 40.0 -50.0 85.0 and SIZE is set to 600 284.

Can anyone see what is wrong that would cause zoom in to fail?  I get no error messages, and eventually PHP responds with a time out message.

Below is my code.

Thanks,
D. Pagurek

<?php
dl("php_mapscript_35.dll");

// Default values and configuration
$val_zsize=3;
$check_pan="CHECKED";
$map_path="";
$map_file="feat.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);

}

$image=$map->draw();
$image_url=$image->saveWebImage(MS_PNG,1,1,0);

$extent_to_html = $map->extent->minx." ".$map->extent->miny." ".$map->extent->maxx." ".$map->extent->maxy;

?>
<HTML>
<HEAD>
<TITLE>Butterflies of Canada </TITLE>
</HEAD>
<BODY>
<CENTER>
<H2><?php echo $taxon ?></H2>

<FORM METHOD=POST ACTION=<?php echo $PHP_SELF?>>
<INPUT TYPE="HIDDEN" NAME="taxon" VALUE="<?php echo $taxon?>">
<TABLE>
<TR>
	<TD>
		<INPUT TYPE=IMAGE NAME="mapa" SRC="<?php echo $image_url?>">
	</TD>
</TR>
<TR>
	<TD>
		Pan
	</TD>
	<TD>
		<INPUT TYPE=RADIO NAME="zoom" VALUE=0 <?php echo $check_pan?>>
	</TD>
</TR>
<TR>
	<TD>
		Zoom In
	</TD>
	<TD>
		<INPUT TYPE=RADIO NAME="zoom" VALUE=1 <?php echo $check_zin?>>
	</TD>
</TR>
<TR>
	<TD>
		Zoom Out
	</TD>
	<TD>
		<INPUT TYPE=RADIO NAME="zoom" VALUE=-1 <?php echo $check_zout?>>
	</TD>
</TR>
<TR>
	<TD>
		Zoom Size
	</TD>
	<TD>
		<INPUT TYPE=TEXT NAME="zsize" VALUE="<?php echo $val_zsize?>" SIZE=2>
	</TD>
</TR>
<TR>
	<TD>
		Full Extent
	</TD>
	<TD>
		<INPUT TYPE=SUBMIT NAME="full" VALUE="Go" SIZE=2>
	</TD>
</TABLE>
<INPUT TYPE=HIDDEN NAME="extent" VALUE="<?php echo $extent_to_html?>">
</FORM>
</CENTER>
<a href="http://pagureknt/php/butterfly/examplestart.php">Change taxon</a>
</BODY>
</HMTL>