I figured it out. It was actually pretty easy. For reference to others
who might need to do this also, I'll post my methodology. I also have
one outstanding question at the end...
Mapscript snippet looks like this:
// Make a new point object
$cnty_layer = $map->getLayerByName('cnty');
$my_point = ms_newpointObj();
$my_point->setXY($lon,$lat);
// Run a point query on the county layer.
// layer must have a class with a LAYER TEMPLATE value
if ($cnty_layer->queryByPoint($my_point,MS_SINGLE,1)==MS_SUCCESS){
$cnty_result = $cnty_layer->getResult(0); // Get the result
$cnty_layer->open(); // Open layer for use with getShape()
$cnty_shape=$cnty_layer->getShape($cnty_result->tileindex,$cnty_result->shapeindex);
// Draw the shape onto the shaded county layer
$cnty_shade = $map->getLayerByName('shade_red');
$cnty_shape->draw($map, $cnty_shade, $image);
}
Mapfile snippet that goes along with the above looks like this:
LAYER
NAME shade_red
TYPE POLYGON
STATUS ON
TRANSPARENCY 50 # use OPACITY in mapserver v5
CLASS
NAME "Red County"
COLOR 187 0 0
END
END
Notice the transparency in the layer above. I'm still on mapserver 4.x.
The problem is that the layer doesn't draw with any transparency, no
matter what I put as the value. Any ideas?
Mark
Mark Brooks wrote:
I have a shapefile of type polygon of all counties in the United States.
Given a latitude/longitude point, I want to shade/hatch the county that
it's in. I'm not sure of the best way to do this. Any suggestions?
I'm working with PHP Mapscript by the way.
Mark
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