Tom, that PPT linked from your example is filled with good stuff.
Anyway, I took your example and did some minor changes to make it work
with mapscript as Fedora installs it and my data. Then I added the
ability to turn projection on & off. With the projection off, everything
works great. But, I'm still getting a blank image with the projection
turned on. If anyone has any pointers on what's wrong with the code
(below) I'd appreciate it.
Tim Wood
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<?PHP
// Where my key directories are located
$doc_root = '/var/www/html';
$rel_path = "example1/round2";
$base_path = "$doc_root/$rel_path";
// An empty map file
$base_map = "$base_path/data/empty.map";
// The data I'm using (Statistics Canada's 2006 FSA files)
$shape_path = "$base_path/data/zcta/zt08_d00_shp/"; // goofy path
I'm too lazy to fix
$shape_file = "gfsa000b06a_e"; // works with or
w/o the extension
$shape_file_projection = "+proj=longlat +datum=NAD83";
// The Extents (area) I want in latitude, longitude (Canada)
list( $ex0, $ex1, $ex2, $ex3 ) = array(-140, 40, -50, 55 );
// Describe the rest of my output
$output_projection = '';
$output_projection = "+proj=tcc +lon_0=90w +ellps=GRS80";
$output_file_rel = "output/index2.png";
$output_file_path = "$base_path/$output_file_rel";
list($output_width, $output_height ) = array( 600, 500 );
// Load MapScript extension
if (!extension_loaded("MapScript")) dl('php_mapscript.'.PHP_SHLIB_SUFFIX);
// add map
$map = ms_newMapObj( $base_map );
// tdw temp
$map->setExtent( $ex0, $ex1, $ex2, $ex3 );
// Set the shapepath
$map->set( 'shapepath', $shape_path );
// Set the output format and size
$map->selectOutputFormat( 'png' );
$map->setSize( $output_width, $output_height );
// add new layer to map
$layer = ms_newLayerObj($map);
$layer->set("name", "foo");
$layer->set("status", MS_ON);
$layer->set("data", $shape_file );
$layer->set("type", MS_SHAPE_POLYGON );
$layer->setProjection( $shape_file_projection );
// This line hides a bunch of errors that appear iff $output_projection
is set
$layer->set("template", "ttt");
$layer->set("dump", "true");
// add new class to new layer
$class = ms_newClassObj($layer);
$class->set("name", "foo");
// add new style to new class
$style = ms_newStyleObj($class);
$style->color->setRGB(255, 0, 0);
$style->outlinecolor->setRGB( 128,128,128 );
if( $output_projection != '' ) { // Project and Draw
// create new rect to query against the new layer
$rect = ms_newRectObj();
$rect->setExtent( $ex0, $ex1, $ex2, $ex3 );
// query new layer
$layer->queryByRect( $rect );
$map->queryByRect( $rect );
// set projection of output map
$map->setProjection($output_projection, MS_TRUE);
// draw
$image = $map->drawQuery();
} else { // Just draw the map
// draw
$image = $map->draw();
}
// Save the image
$image->saveImage( $output_file_path );
?>
<html>
<body>
<img src="<?PHP print $output_file_rel; ?>">
</body>
</html>
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Kralidis,Tom [Ontario] wrote:
I've added a small example at:
http://trac.osgeo.org/mapserver/wiki/PHPMapscriptAddLayerQueryReproject
Hope this helps.
..Tom
-----Original Message-----
From: [email protected] on behalf of Tim Wood
Sent: Sat 07-Feb-09 22:55
To: [email protected]
Subject: [mapserver-users] Problems with MapScript and setProjection
I've been round and round with setProjection in MapScript and
setProjection today. I either get the infamous blank image or the image
returns in the same proportions as the original lat/long data. Proj
seems to be (at least partially) working because if I forget something
like +ellps=[blah blah], it throws an error.
I'd like to look at a simple php mapscript example of creating a map,
adding a layer, adding something to that layer (e.g. my a simple query
against a lat/long shapefile) and then project that another way (tmerc,
lcc, whatever). But, I have yet to find one. Can someone share a working
example or know of one on the web?
Tim Wood
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