Textsymbolizer for line placement with long names.

[Hemant Bist-2]

Hi,
I am seeing that for labeling lines, Mapnik is not drawing labels for placement="line" if the name to be labelled is "longer" than the line segment.   Just in case this is expected behavior, is there a way I can override it? [For this highest zoom level, I would prefer not nice looking names to no names].

Here is why I suspect this.

One line feature is not near any other feature. For that feature
 a) If I reduce the font size, to reduce the total length of name it works.
 b) Or if I remove the placement = line, it works.
 c)  I have tried allow_overlap min_distance, max_char_angle_Delta, but this does not seem to help.

I am using Mapnik code that I had downloaded from svn on 2009-07-03.

I am giving below what does not work and what changes make the name appear.

Thanks,
Hemant

<!-- Does not work tried min_distance avoid_edges, allow_overlap, wrap_width label_position_tolerance -->
            <TextSymbolizer name="NAME" face_name="DejaVu Sans Bold" size="12" fill="rgb(0,0,0)" max_char_angle_delta="90" placement="line" wrap_width="20" text_convert="toupper" dy="7" allow_overlap="true" min_distance="0" avoid_edges="false" label_position_tolerance="2000" ></TextSymbolizer>

<-- Reduce font size to 6 so that the name length is less than line  -->
            <TextSymbolizer name="NAME" face_name="DejaVu Sans Bold" size="6" fill="rgb(0,0,0)" max_char_angle_delta="90" placement="line" wrap_width="20" text_convert="toupper" dy="7" allow_overlap="true" min_distance="0" avoid_edges="false" label_position_tolerance="2000" ></TextSymbolizer>

<!-- remove line placement and it works -->
            <TextSymbolizer name="NAME" face_name="DejaVu Sans Bold" size="10" fill="rgb(0,0,0)" max_char_angle_delta="90"  wrap_width="20" text_convert="toupper" dy="7" allow_overlap="true" min_distance="0" avoid_edges="false" label_position_tolerance="2000" ></TextSymbolizer>



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[Dane Springmeyer]

Hemant,

See http://trac.mapnik.org/ticket/13 and note the links at the bottom  
of the ticket I have updated for you.

Dane


On Oct 3, 2009, at 3:45 PM, Hemant Bist wrote:

> Hi,
> I am seeing that for labeling lines, Mapnik is not drawing labels  
> for placement="line" if the name to be labelled is "longer" than the  
> line segment.   Just in case this is expected behavior, is there a  
> way I can override it? [For this highest zoom level, I would prefer  
> not nice looking names to no names].
>
> Here is why I suspect this.
>
> One line feature is not near any other feature. For that feature
>  a) If I reduce the font size, to reduce the total length of name it  
> works.
>  b) Or if I remove the placement = line, it works.
>  c)  I have tried allow_overlap min_distance, max_char_angle_Delta,  
> but this does not seem to help.
>
> I am using Mapnik code that I had downloaded from svn on 2009-07-03.
>
> I am giving below what does not work and what changes make the name  
> appear.
>
> Thanks,
> Hemant
>
> <!-- Does not work tried min_distance avoid_edges, allow_overlap,  
> wrap_width label_position_tolerance -->
>             <TextSymbolizer name="NAME" face_name="DejaVu Sans Bold"  
> size="12" fill="rgb(0,0,0)" max_char_angle_delta="90"  
> placement="line" wrap_width="20" text_convert="toupper" dy="7"  
> allow_overlap="true" min_distance="0" avoid_edges="false"  
> label_position_tolerance="2000" ></TextSymbolizer>
>
> <-- Reduce font size to 6 so that the name length is less than line  
> -->
>             <TextSymbolizer name="NAME" face_name="DejaVu Sans Bold"  
> size="6" fill="rgb(0,0,0)" max_char_angle_delta="90"  
> placement="line" wrap_width="20" text_convert="toupper" dy="7"  
> allow_overlap="true" min_distance="0" avoid_edges="false"  
> label_position_tolerance="2000" ></TextSymbolizer>
>
> <!-- remove line placement and it works -->
>             <TextSymbolizer name="NAME" face_name="DejaVu Sans Bold"  
> size="10" fill="rgb(0,0,0)" max_char_angle_delta="90"  
> wrap_width="20" text_convert="toupper" dy="7" allow_overlap="true"  
> min_distance="0" avoid_edges="false" label_position_tolerance="2000"  
> ></TextSymbolizer>
>
>
> _______________________________________________
> Mapnik-users mailing list
> Mapnik-users@...
> https://lists.berlios.de/mailman/listinfo/mapnik-users

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