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- .. _css_transform:
- Rendering transformations in CSS
- ================================
- .. highlight:: scss
- Starting with GeoServer 2.10 the CSS modules supports rendering transformations via the
- ``transform`` property.
- The property is a function call with a special key/value pair syntax, using the following template::
- transformationName(key1:value1,key2:v21 v22 ... v2M,...,keyN:vN)
-
- The values can be simple ones, or can be a space separated list. The parameter representing the
- input layer can be omitted, the engine will automatically recognize input parameters of type feature collection
- or grid coverage.
- The transformation function is subject to cascading like all other properties, but cascading acts
- at the whole z-level, so if multiple transformations are needed, they need to be associated with
- two different z-levels.
- This is an example of a CSS style extracting contour lines from a DEM, and also showing the single values
- when a suitable zoom level is reached::
- /* @title Levels */
- * {
- transform: ras:Contour(levels: 1100 1200 1300 1400 1500 1600 1700);
- z-index: 0;
- stroke: gray;
- label: [numberFormat('#', value)];
- font-size: 12;
- font-fill: black;
- font-weight: bold;
- halo-color: white;
- halo-radius: 2;
- label-follow-line: true;
- label-repeat: 200;
- label-max-angle-delta: 45;
- label-priority: 2000;
- }
-
- /* @title Values */
- [@sd < 12000] {
- transform: ras:RasterAsPointCollection(scale: 0.5);
- z-index: 1;
- label: [GRAY_INDEX];
- label-anchor: 0.5 0.5;
- font-family: Arial;
- font-fill: black;
- font-size: 6;
- label-priority: 1000;
- }
- .. figure:: images/transformation.png
- :align: center
- *The two transformations in action against a DEM layer*
-
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