PHPMapscriptAddLayerQueryReproject
== Example 1 ==
Here's a small example which:
- opens a mapfile
- adds a new layer
- queries new layer
- reprojects output map
- draws and saves to file
Example based on http://dl.maptools.org/dl/omsug/osgis2004/php_mapscript_mum2.ppt in response to http://n2.nabble.com/Problems-with-MapScript-and-setProjection-tt2291579.html#none
Contributed by Tom Kralidis.
<?php
// load mapscript
dl("php_mapscript.so");
// add map
$map = ms_newMapObj("config.map");
// add new layer to map
$layer = ms_newLayerObj($map);
$layer->set("name", "foo");
$layer->set("status", MS_ON);
$layer->set("data", "path/to/file.shp");
$layer->set("type", MS_LAYER_POINT);
$layer->setProjection("init=epsg:4326");
$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->set("symbol", 2);
$style->set("size", 8);
$style->color->setRGB(255, 0, 0);
// create new rect to query against the new layer
$rect = ms_newRectObj();
$rect->setExtent(-95, 40, -50, 60);
// query new layer
$layer->queryByRect($rect);
// set projection of output map
$map->setProjection("init=epsg:42304", MS_TRUE);
// draw
$image=$map->drawQuery();
$image->saveImage("/tmp/out.png");
?>
== Example 2 ==
The example below works under !MapServer 5.2.1 (tested under Fedora 10). Contributed by Tim Wood.
<?PHP
/**
* Code to create a map from a shapefile
* and then (optionally) reproject the whole thing
*
* If you just want to look at the reprojection stuff, start
* with the "reproject (if needed) and draw" section at the end.
* The rest
*
* Created by Tim Wood from code and input
* by Tom Kralidis [Ontario], Pietro Gianninni and Stephen Jones.
*
* No copyright restrictions
*/
// ---------------------------
// Configuration
// aka set a bunch of variables and load the mapscript extension
//
// 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"; // just the words MAP and END on dif. lines... really
// The data I'm using
$shape_path = "$base_path/data/zcta/zt08_d00_shp/"; // a 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
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);
// ---------------------------
// Function(s)
//
/**
* Reproject a $map from $shape_file_projection to $output_projection
*/
function reproject_map( &$map, $shape_file_projection, $output_projection ) {
$origProjObj = ms_newProjectionObj( $shape_file_projection );
$newProjObj = ms_newProjectionObj( $output_projection );
$oRect = $map->extent;
$oRect->project( $origProjObj, $newProjObj );
$map->setExtent( $oRect->minx, $oRect->miny, $oRect->maxx, $oRect->maxy );
$map->setProjection( $output_projection );
}
// ---------------------------
// The Main Code
//
// add map
$map = ms_newMapObj( $base_map );
$map->set( 'name', 'my_map' ); // If we're using a blank map file, give it a name
// Set the extent
$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 );
$layer->set("template", "ttt"); // hide errors that appear iff $output_projection is set?
$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 );
// reproject (if needed) and draw
if( $output_projection != '' ) {
reproject_map( $map, $shape_file_projection, $output_projection );
$image = $map->drawQuery();
} else {
// draw
$image = $map->draw();
}
// ---------------------------
// Output the image
//
$image->saveImage( $output_file_path );
?>
<html>
<body>
<img src="<?PHP print $output_file_rel; ?>">
</body>
</html>
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