Hi All,
I have finished implementing the chainable compositing filters that
were architectured along with RFC113, and the code has been committed
to the master branch. The aim of the development is essentially to
enable soft shadow and blurring effects, although other usages can
exist or could be added in the future.
To obtain a soft shadow effect that can be seen for example around the
buildings on
http://sitn.ne.ch/production/wsgi/mobile/?theme=mobile_default&baselayer_ref=plan_ville&map_x=554942.49763489&map_y=200242.9936142&map_zoom=6&tree_layers=
you can use
LAYER
NAME "buildings"
TYPE POLYGON
COMPOSITE
#create the shadow/blur effect by translating a blurred version of the layer
COMPFILTER "grayscale()"
COMPFILTER "translate(5,5)"
COMPFILTER "blur(4)"
OPACITY 50
END
COMPOSITE
#and render the buildings themselves
OPACITY 100
END
CLASS
STYLE
COLOR 128 128 128
OUTLINECOLOR 0 0 0
WIDTH 1
END
END
END
The currently available filters are:
- "blur(integer)"
- "translate(integer,integer)"
- "grayscale()"
- "blacken()"
- "whiten()"
I'll add some documentation and autotests next week.
best regards,
Thomas
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