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PointSymbolizer
Jez Nicholson edited this page 2018-01-23 13:32:21 +00:00
Symbolizer that specifies rendering of a png, tiff, or svg graphic symbol at a point.
To combine a graphic symbol with a text label, use a ShieldSymbolizer. If you want to change the image offset, use a MarkersSymbolizer.
Configuration Options
Some options described here are not available in mapnik versions < 2.0.
| parameter | value | default | accepts expressions |
|---|---|---|---|
| file | path to image file | none | mapnik >= 2.0 |
| width (removed) | px | 4 | |
| height (removed) | px | 4 | |
| type (removed) | png tiff svg | none | |
| allow-overlap | allow text to overlap the point image; true/false | false | no |
| opacity | Opacity of the symbolizer: 0.0 - 1.0 | 1.0 | no |
| transform | SVG transform | identity | mapnik >= 3.0 you have to specify transform, but you can use expressions for its parameters, e.g. "rotate([value1]) scale([value2])" |
| ignore-placement | allow subsequent point/shield symbolizers to overlap this symbol; true/false | false | no |
| comp-op | Compositing | none | no |
Examples
Default
XML
<PointSymbolizer/>
Python
sym = PointSymbolizer()
C++
using mapnik::point_symbolizer;
point_symbolizer sym;
Image label
XML
<PointSymbolizer file="/tmp/pub.png" transform="scale(2)" />
Python
sym = PointSymbolizer("/tmp/pub.png", "png", 16, 16)
# args are file, type, height, width
sym.allow_overlap = True
sym.opacity = .5
C++
using mapnik::point_symbolizer;
point_symbolizer sym("/tmp/pub.png","png",16,16);
Allow Overlap
XML
<PointSymbolizer allow-overlap="yes" file="/Users/artem/projects/
openstreetmap/mapnik/symbols/station_small.png" />
Do Not Allow Overlap
XML
<PointSymbolizer allow-overlap="no" file="/Users/artem/projects/
openstreetmap/mapnik/symbols/station_small.png" />
SVG symbols (trunk)
<PointSymbolizer file="/Users/artem/Desktop/svg/lion.svg" opacity="1.0" transform="scale(0.2,0.2)" />
<PointSymbolizer file="/Users/artem/Desktop/svg/lion.svg" opacity="1.0" transform="rotate(45) scale(0.4,0.4)" />