Dear all,
I am currently stuck in a rut when trying to make a php mapscript that makes it
possible to zoom into a map multiple times. I have it so that when the user
clicks on the image it sends to my php script a set of coordinates based on
where an <img> is clicked using the ismap attribute. The href is self
referencing and reopens the same .php document the tags are in. Now my problem
comes in where once I've zoomed in once by a factor of 2, the next time the
user clicks on the image and zoomtopoint()is called again, it is still
referencing the same extent it did for the first call to zoomtopoint(). How do
I carry over the values from the extent generated after the first zoom to any
zoomtopoint() call from there on out.
Here is my mapscript:
<?php
$map_path="/usr/lib/cgi-bin/";
$map = ms_newMapObj($map_path."blah_test.map");
if (count($_GET)) {
$map_path="/usr/lib/cgi-bin/";
$map = ms_newMapObj($map_path."blah_test.map");
$map_height=$map->height;
$map_width=$map->width;
$map_extent=$map->extent;
$x1=$map_extent->minx;
$y1=$map_extent->miny;
$x2=$map_extent->maxx;
$y2=$map_extent->maxy;
$e= array($x1, $y1, $x2, $y2);
print_r($e);
$coords = array_keys($_GET);
$coords = explode(',', $coords[0]);
$x = $coords[0];
$y = $coords[1];
$zoom_point=new pointObj();
$zoom_point->setXY($x,$y);
$zoomFactor=2; //set zoomFactor to positive or negative
depending on the user's input via button
$map_extent=$map->extent;
$map->zoompoint($zoomFactor,$zoom_point,$map_width,$map_height,$map_extent);
$map_extent=$map->extent;
$x1=$map_extent->minx;
$y1=$map_extent->miny;
$x2=$map_extent->maxx;
$y2=$map_extent->maxy;
$e= array($x1, $y1, $x2, $y2);
print_r($e);
}
$image=$map->draw();
$image_url=$image->saveWebImage();
?>
Here is the image tag:
<div id="map">
<a href="blahtest.php" name="img"> // here is
the self referencing href
<img type="image" name="img" id="map" ismap="ismap" type="image" src=<?php echo
$image_url; ?> width="<?php echo $map_width; ?>" height="<?php echo
$map_height; ?> "border=0 alt="Map Image">
</a>
</div>
Any help is appreciated!
-Paul
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