It would be useful if someone (preferably a developer ...)
could file a documentation issue for this (and issues for
other enhancements that have not yet been documented).
http://github.org/mapserver/docs
Håvard
On 26/10/2015 22:54:PM, [email protected] wrote:
Since I mentioned the command "PROCESSING FORCE_DRAW_LABEL_CACHE=FLUSH" in a
previous entry I thought it could be good to describe how it is used. Maybe this could be
the basis for some description in the manual.
In my mind this is best improvement in Mapserver 7.0
The use case:
To produce a WMS service where You could zoom in from a very small scale like
Europe down to a very detailed city map. You only have detailed data in certain
parts.
One data set larger area like the Nordic countries 1:1M, one data set a nation
like Sweden 250K and one detailed data set over one town 50K. I don't have
detailed data in the other countries and I only have town data covering one
town.
The usage is like this:
Draw all layers in the small scale data set without any MAXSCALEDENOM.
Do a FORCE DRAW LABEL CACHE
Draw all layer in the 250k data set on top with a MAXSCALEDENOM=500000, or
whatever is good for each layer when You would like to turn on your data.
Do another FORCE DRAW LABEL CACHE
Draw all the layers in the 50k town data set on top of that with a
MAXSCALEDENOM=70000
The following mapfile shows the principle for using the command. The example
shows the effect of using and not using the FORCE DRAW LABEL CACHE command.
Just run the example with shp2img.
----------------------------------------------------------------------------------------------------------------------------------------
MAP
NAME FDLC
# Author: Lars Schylberg, 2015-09-26
#
# Requires Mapserver 7-0
#
# shp2img -m force_draw_label_cache.map -o without_force_label_cache.png -s 500 300 -e
-80 42 -74 46 -l "towns big_city"
#
# Result is that the unwanted red Big City label is showing up on top of the
Big city polygon.
#
# shp2img -m force_draw_label_cache.map -o with_force_label_cache.png -s 500 300 -e -80
42 -74 46 -l "towns force_cache big_city"
#
# Result is the wanted, label cache is drawn after the towns layer and the
big_city polygon can draw its new label.
#
PROJECTION
"init=epsg:4326"
END
SYMBOL
NAME "circle"
TYPE ellipse
FILLED true
POINTS
1 1
END
END
WEB
METADATA
"ows_enable_request" "*"
"ows_title" "foo server"
END
END
LAYER
NAME "towns"
STATUS ON
TYPE POINT
FEATURE
POINTS -75 45 END
TEXT "Village"
END
FEATURE
POINTS -79 43 END
TEXT "Town"
END
FEATURE
POINTS -77 44 END
TEXT "Big City"
END
FEATURE
POINTS -75 43 END
TEXT "Village2"
END
FEATURE
POINTS -79 45 END
TEXT "Town2"
END
CLASS
NAME "PopulatedPlaces"
STYLE
SYMBOL "circle"
SIZE 10
COLOR 10 10 0
END
LABEL
SIZE large
COLOR 255 0 0
POSITION AUTO
FORCE TRUE
END
END
END # Layer
LAYER
NAME "force_cache"
TYPE POINT
PROCESSING "FORCE_DRAW_LABEL_CACHE=FLUSH"
TRANSFORM FALSE
STATUS ON
FEATURE
POINTS 1 1 END
END
END # Layer
LAYER
NAME "big_city"
TYPE POLYGON
FEATURE
POINTS
-78 44.5
-76 44.5
-76 43.5
-78 43.5
-78 44.5
END
TEXT 'Big City'
END
CLASS
STYLE
COLOR 255 250 0
END
LABEL
SIZE giant
COLOR 0 0 0
POSITION AUTO
FORCE TRUE
END
END
END # Layer
END # Map
_______________________________________________
mapserver-users mailing list
[email protected]
http://lists.osgeo.org/mailman/listinfo/mapserver-users
_______________________________________________
mapserver-users mailing list
[email protected]
http://lists.osgeo.org/mailman/listinfo/mapserver-users
