[mapserver-users] PHP mapscript createLegendIcon doesn't follow style maxscaledenom

[Paul Moen]

In case anyone else wants the createLegendIcon to return the image based what would be drawn at the current mapscale, here is what I did.

In the mapserver 7.0.4 source code, mapscript/php/mapscript_i.c line 1116  has scale_independant hard coded to MS_TRUE.  I changed it to MS_FALSE, recompiled and have the behavior that I was expecting.  

Thanks,




On Mar 30, 2017, at 11:01 AM, Moen, Paul T. <pmoen at nd.gov> wrote:

Sorry I forgot to say that I have tried the script with the following versions with the same results.
 
MapServer version 7.0.3 OUTPUT=PNG OUTPUT=JPEG OUTPUT=KML SUPPORTS=PROJ SUPPORTS=AGG SUPPORTS=FREETYPE SUPPORTS=CAIRO SUPPORTS=WMS_SERVER SUPPORTS=WMS_CLIENT SUPPORTS=WFS_SERVER SUPPORTS=WFS_CLIENT SUPPORTS=WCS_SERVER SUPPORTS=GEOS INPUT=JPEG INPUT=POSTGIS INPUT=OGR INPUT=GDAL INPUT=SHAPEFILE
 
MapServer version 6.4.4 OUTPUT=PNG OUTPUT=JPEG OUTPUT=KML SUPPORTS=PROJ SUPPORTS=AGG SUPPORTS=FREETYPE SUPPORTS=CAIRO SUPPORTS=WMS_SERVER SUPPORTS=WMS_CLIENT SUPPORTS=WFS_SERVER SUPPORTS=WFS_CLIENT SUPPORTS=WCS_SERVER SUPPORTS=GEOS INPUT=JPEG INPUT=POSTGIS INPUT=OGR INPUT=GDAL INPUT=SHAPEFILE
 
 
From: mapserver-users <mapserver-users-bounces at lists.osgeo.org <mailto:mapserver-users-bounces at lists.osgeo.org>> on behalf of Paul Moen <pmoen at nd.gov <mailto:pmoen at nd.gov>>
Date: Thursday, March 30, 2017 at 10:45 AM
To: "mapserver-users at lists.osgeo.org <mailto:mapserver-users at lists.osgeo.org>" <mapserver-users at lists.osgeo.org <mailto:mapserver-users at lists.osgeo.org>>
Subject: [mapserver-users] PHP mapscript createLegendIcon doesn't follow style maxscaledenom
 
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I am finding that createLegendIcon returns a different legend item than what is used in the map output when using scaledenom in the style.
 
Below is a test script that produces what I am talking about. 
 
The script will create 4 images.
 
map_scale_873.png -> map->draw output with a 873 scaledenom
map_scale_2618.png -> map->draw with a 873 scaledenom
legimg_scale_873.png -> createLegendIcon output with a 873 scaledenom
legimg_scale_2618.png -> createLegendIcon output with a 873 scaledenom
 
 
I was expecting that the legend image at the 873 scale, legimg_scale_873.png would match the map output, map_scale_873.png.  Can anyone see a problem, is this a bug, or is this expected behavior?
 
<?php
 
$mapstr = <<<EOT
MAP
                NAME AERIAL
                EXTENT 100 100 400 400
                SIZE 100 100
                UNITS FEET
                LAYER
                                NAME 'TEST'
                                STATUS ON
                                TYPE LINE
                                FEATURE
                                                WKT 'LINESTRING(250 250, 250 500, 500 500, 500 250,250 250)'
                                END
                                CLASS
                                                NAME "Boundary"
                                                STYLE
                                                                WIDTH 4.0
                                                                MAXWIDTH 6.0
                                                                COLOR 150 255 150
                                                                MAXSCALEDENOM 1000
                                                END
                                                STYLE
                                                                WIDTH 2.0
                                                                MAXWIDTH 2.0
                                                                COLOR 0 0 0
                                                                PATTERN 20.0 10.0 5.0 10.0 END
                                                                MAXSCALEDENOM 1000
                                                END
                                                STYLE
                                                                WIDTH 4.0
                                                                MAXWIDTH 4.0
                                                                COLOR 150 255 150
                                                                MINSCALEDENOM 1001
                                                END
                                                END
                                END
                END
END
EOT;
 
                $map = ms_newMapObjFromString($mapstr);
                $map->selectOutputFormat('png');
                $img=$map->draw();
                $name=round($map->scaledenom);
                $img->saveImage("map_scale_$name.png");
                $tmpLay =$map->getLayer(0);
                $tmpclass = $tmpLay->getClass(0);
                $tmpImg = $tmpclass->createLegendIcon(50,50);
                $tmpImg->saveImage("legimg_scale_$name.png");
                $map->setextent(200,200,300,300);
                $img2=$map->draw();
                $name=round($map->scaledenom);
                $img2->saveImage("map_scale_$name.png");
                $tmpImg->saveImage("legimg_scale_$name.png");
                
?>
 
Thanks,
 
Paul
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