Python使用XML操作mapnik,实现复杂标注（Multi line text symbolizer）

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test.py

import mapnikstylesheet = 'world_style.xml'image = 'world_style.png'm = mapnik.Map(1200, 800)mapnik.load_map(m, stylesheet)m.zoom_all() mapnik.render_to_file(m, image)print "rendered image to '%s'" % image

world_style.xml

<Map background-color="#c4dff6" 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" font-directory="./fonts" maximum-extent="-20037508.34,-20037508.34,20037508.34,20037508.34">  <Style name="My Style">    <Rule><!-- 复杂标注 -->    <TextSymbolizer face-name="DejaVu Sans Bold" size="12" placement="point" dy="3" wrap-width="35" allow-overlap="0">        [NAME]+'-'+[LEVEL]        ++'&#10;'<Format face-name="DejaVu Sans Oblique" size="9">'-'</Format>        +'&#10;'<Format face-name="DejaVu Sans Oblique" size="9">'('+[POSTAL]+')'+'-'+[LabelRank]</Format>    </TextSymbolizer>    </Rule>  </Style>  <Layer name="world" srs="+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs">    <StyleName>My Style</StyleName>    <Datasource>      <Parameter name="type">shape</Parameter>      <Parameter name="file">ne_110m_admin_0_countries.shp</Parameter>    </Datasource>  </Layer></Map>

效果图：

参考：

http://blog.csdn.net/u010924834/article/details/56291059
http://mapnik.org/news/text_formating
https://github.com/mapnik/mapnik/issues/3158

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