[mapserver-users] labels for pie|bar charts

[Lime, Steve D (MNIT)]

You weren't labeling slices with PHP from the looks of it, just the underlying feature using an annotation layer. So setting up a layer to behave like an annotation layer is doable... Here's a simple snippet for the state of Minnesota polygon:

  LAYER
    NAME bdry_statepy2
    STATUS DEFAULT
    TYPE POLYGON
    DATA ' bdry_statepy2'
    CLASS
      LABEL
        TEXT 'Minnesota'
        POSITION CC
        SIZE LARGE
        COLOR 0 0 0
      END
    END
  END

Basically using a class with no styles.

I don't recall the individual chart components (pies, bars, etc...) as being labelable. It's not covered in the docs or the original RFC. I will whip up a test case to confirm the behavior though.

--Steve

-----Original Message-----
From: Nicol Hermann [mailto:mapserver at geoworld.de] 
Sent: Thursday, August 01, 2019 12:33 PM
To: Lime, Steve D (MNIT) <steve.lime at state.mn.us>; mapserver-users at lists.osgeo.org
Subject: Re: [mapserver-users] labels for pie|bar charts

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Hello Steve,

you are right. With older versions of Mapserver I used 2 layers.
One for the chart (type=chart) and the other one to do the labeling
(type=annotation).
I used PHP Mapscript at that time. See the code snippet for the
annotation layer below. It uses the same data source like the chartlayer.

$layer = ms_newLayerObj($Map);
$layer -> set('status', MS_ON);
$layer -> set('labelcache', MS_ON);
$layer -> set('type', MS_LAYER_ANNOTATION );
$layer -> set('data', $datapath);
$layer -> set('status', MS_ON);
$poClass = ms_newClassObj($layer);
$poClass-> set("name", "Beschrifung " );
$felder= '(';
foreach( $chartLayer['fieldlist'] as $feld ){
   $felder .= sprintf('%s = [%s]-', $feld, $feld);
}
$felder .=sprintf(')');
$poClass->settext($layer, "$felder");
$poClass-> label -> set('font', "arial");
$poClass-> label -> set('type', MS_TRUETYPE);
$poClass-> label -> set('size', 8);
$poClass-> label -> set('antialias', MS_TRUE);
$poClass-> label -> color -> setRGB ( 0, 0, 0 );
$poClass-> label -> set ('wrap', 0x2d); // use '-' to do a line break
$poClass-> label ->set('position', MS_AUTO);
$poClass-> label ->set('partials', MS_FALSE);
$poClass-> label ->backgroundcolor->setRGB('240','240','240');

Unfortunately this approach do not work anymore as the annotation type
is not longer supported.

The MapFile which I am trying currently looks like this:

  LAYER
    DATA
"/home/nicol/public_html/geoworld/gw2_1und1/data/brd/media.shp"
    LABELITEM "NAME"
    NAME "Staedtecharts"
    PROJECTION
      "init=epsg:4326"
    END # PROJECTION
    STATUS DEFAULT
    TYPE CHART
    # PROCESSING "CHART_SIZE_RANGE=bevzahl"
    # PROCESSING "CHART_SIZE=130" # Fixe Groesse
    PROCESSING "CHART_TYPE=pie"  # pie, bar
    PROCESSING "CHART_SIZE_RANGE = itemname minsize maxsize minval
maxval exponent"
    PROCESSING "CHART_SIZE_RANGE=bevzahl 30 300 100000 2000000"
    LABELITEM "NAME"
    UNITS DD
    CLASS
      NAME "Maennlich"
      TEXT 'Hallo'
      LABEL
        FONT "arial"
        SIZE 30
        COLOR 255 0 0
        ENCODING "UTF-8"
        MINFEATURESIZE AUTO
        OFFSET 0 0
        POSITION AUTO
        SHADOWSIZE 1 1
      END # LABEL
      STYLE
        COLOR 192 192 192
        OUTLINECOLOR 0 0 0
        SIZE [mann]
      END # STYLE
    END # CLASS
    CLASS
      NAME "Weiblich"
      STYLE
        SIZE [frau]
        COLOR 255 255 0
        OUTLINECOLOR 0 0 0
      END
    END
  END # LAYER


My hope was that the chart type now also takes care of the labeling.

Any idea how to realize the labeling for the individual slices now?

Thanks
Nicol


Am Donnerstag, den 01.08.2019, 14:34 +0000 schrieb Lime, Steve D
(MNIT):
> Hi Nicol: Do you you have a sample mapfile that showed your approach?
> Since CHART and ANNOTATION are both layer types that implies multiple
> layers. --Steve
>
> -----Original Message-----
> From: mapserver-users [mailto:mapserver-users-bounces at lists.osgeo.org
> ] On Behalf Of Nicol Hermann
> Sent: Wednesday, July 31, 2019 2:52 PM
> To: mapserver-users at lists.osgeo.org
> Subject: [mapserver-users] labels for pie|bar charts
>
> This message may be from an external email source.
> Do not select links or open attachments unless verified. Report all
> suspicious emails to Minnesota IT Services Security Operations
> Center.
>
>
>
> Hello,
>
> I am trying to understand how labeling/annotation with layer type
> 'chart' for the individual slices e.g. of a PIE/BAR chart would work
> (
> https://gcc01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fmapserver.org%2Foutput%2Fdynamic_charting.html&data=02%7C01%7Csteve.lime%40state.mn.us%7Ca807c021ad0c41a044b308d716a64292%7Ceb14b04624c445198f26b89c2159828c%7C0%7C1%7C637002775647669862&sdata=2vmqPRuyR7SHIQIW%2BGwqRqDsvjeMsC8O6Jfcpu1lYJg%3D&reserved=0).
> I have tried to set a LABELITEM on layer level, a LABEL block within
> the CLASS section, a TEXT property in the CLASS block but none of my
> attempts show any labels.
> In earlier versions of Mapserver I have used the ANNOTATION layer
> type
> to get labels but this type is now deprecated for 7.x versions.
> Any ideas?
> Thank you very much.
>
> Nicol
>
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