Unicode rendering problem on waterways labels.

[rdunklau]

There seeems to be a bug in the waterways labels, with unicode.

I don't really know if this bug should be reported to you, or to mapnik.

The following label definition implicitly convert from unicode to "something-else", resulting in accented letters being replaced by the infamous interrogation mark:

[type='stream'][zoom=18] {
    text-name: "[name].replace('([\S\ ])','$1 ')";
}

This could be fixed on your side by not doubling the spaces, or by performing the work in-db, which doesn't lose the encoding.
This is the solution I implemented (by manually editing the mapnik xml export).

The following code demonstrates how this could be done in your json format:

 {
      "Datasource": {
        "dbname": "osm",
        "extent": "-20037508.34 -20037508.34 20037508.34 20037508.34",
        "geometry_field": "way",
        "id": "waterway_label",
        "key_field": "",
        "project": "foss4g-2011",
        "srs": "+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0.0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs +over",
        "table": "( SELECT way, waterway AS type, regexp_replace(name,  '(\s)', '\1 ', 'g')
 \n FROM planet_osm_line\n WHERE waterway IN ('canal', 'river', 'stream') \n AND name IS NOT NULL\n) AS data",
        "type": "postgis"
}

[Bear4]

I have the same problem too.
At labels.mss [line 350 to 352]
When
#waterway_label[type='river'][zoom>=13], - it;s ok.
#waterway_label[type='canal'][zoom>=15], - not ok. ( missing some polish letter )
#waterway_label[type='stream'][zoom>=17] - not ok. ( missing some polish letter )

I have trying at palette.mss update line 27

@sans_italic: from: "Open Sans Semibold Italic","DejaVu Sans Italic","unifont Medium";
to: "Vivaldi Kursywa", "Unifont Średnia"

without success. Still missing characters.

How I can update fonts at file styles?

[springmeyer]

@Bear4 can you post an image of what you are seeing? It may be that your Mapnik installation's boost_regex lib is not properly linked to ICU. Can you say how you built boost and mapnik?

[Bear4]

Zoom 13 with watherway_label everything it's ok.

Zoom 14 it's not ok.

And this error occurs olny at wather_label zoom >= 14, everything else it's ok.
So I think it's not problem with Mapnik instalation.

Problem is with polish fonts, polish characters.

[Bear4]

When replace:
labels.mss line 364, 369, 374:
form: text-name: "[name].replace('([\S\ ])','$1 ')"; to: text-name: '[name]';

the problem disappears...

[ajashton]

That line is a workaround to for an old Mapnik bug where text-character-spacing did not work for text along a line. That bug is now fixed. I just removed that hack to keep the style simpler and fix this issue.