Hi Brent,
Thanks for the hand-holding. I got the solution for this first part of the
challenge using MapScript; no Mapfile required at all. I will write up a more
generalized article on this for the docs/wiki.
On Aug 28, 2011, at 10:19 AM, Brent Fraser wrote:
> Puneet,
>
> If you don't care about mapserver generating a legend graphic, you could use
> mapserver CGI's ability (no scripting required) to do attribute binding (get
> values from a feature's attribute values). I've used a single class def of:
>
> CLASS
> STYLE # Line, Poly and Point outline
> SYMBOL [sSymbol]
> OUTLINECOLOR [sOutlineColor]
> COLOR [sColor]
> SIZE [sSize]
> END
> TEXT ([Label])
> LABEL
> ANGLE AUTO
> POSITION UR
> COLOR [lColor]
> OUTLINECOLOR [lOutlineColor]
> TYPE truetype
> FONT 'Arial'
> SIZE [lSize]
> END
> END
>
> where the data/connection accessed a view joining the feature table to a
> class table where the styling values were defined. And you need 3 layer
> defs, one for points, lines and polygons. But using this technique, there
> is no way to get a legend graphic show all the classes.
>
> So in your PHP code you would need to do a generic database query to get a
> set of classes, then for each row create a class object and add it to the
> layer object. Then have mapscript process the features and render a map
> image by doing a draw() (and a legend graphic by doing a drawLegend()). Or,
> as others have suggested, you could pass an SLD to mapserver via WMS and
> request a legend graphic.
>
> Best Regards,
> Brent Fraser
>
>
> On 8/27/2011 5:02 PM, Mr. Puneet Kishor wrote:
>> I have a layer classification issue. I want to do something along the lines
>> of (semi-pseudocode ahead) --
>>
>> $layerObj->{data} = 'the_geom FROM (SELECT gid, the_geom, class_name,
>> class_color FROM table) t USING UNIQUE gid';
>> $layerObj->{classitem} = 'class_name';
>>
>> while (my $row in $layerObj->{data}) {
>> create class with 'name = class_name', 'expression = class_name',
>> 'color = class_color'
>> }
>>
>> How do I iterate over the rows retrieved from the table in order to create
>> classes? I don't see any obvious reference to a db result
>> set._______________________________________________
>> mapserver-users mailing list
>> [email protected]
>> http://lists.osgeo.org/mailman/listinfo/mapserver-users
>>
>
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