Brent Fraser wrote:
The short story:
----------------
Is it possible to bind a CLASS's SYMBOL object to an attribute (i.e
store the symbol name as a attribute of a feature)? And the LABEL
objects FONT name?
Binding would be with style'symbol, instead of class symbol. Font also
can be bound. I will update the docs to reflect that. The list of
binding elements is:
For style:
SIZE, WIDTH, ANGLE, COLOR, OUTLINECOLOR, SYMBOL, OUTLINEWIDTH, OPACITY
for labels: SIZE, ANGLE, COLOR, OUTLINECOLOR, FONT, PRIORITY
regards,
The Long Story:
---------------
I've been working with the yet-to-be-released Feature Editor in
Geomoose v2. It allows the user to digitize features (points, lines,
and polygons) and assign attributes, then stores them in PostGIS.
I want to allow simple styling and don't want to have a map file the
size of "War and Peace", so I thought I would use the
attribute/item/column binding abilities of Mapserver's CLASS and LABEL
objects.
To that end, one of the columns the feature table will be "style name"
(or maybe "feature class"), which I'll use to join to a style table
(with COLOR, WIDTH, etc columns) to get the feature rendered in a
simple style.
After a quick review of Mapserver's doc, most of the most important
objects can be bound to attributes, with two exceptions, SYMBOL 'name'
and FONT 'name':
CLASS
STYLE
ANGLE [angle]
COLOR [color] #R G B
OUTLINECOLOR [olcolor] #R G B
SIZE [size]
WIDTH [width] # v5.2
SYMBOL 'name' # in SYMBOLSET
END #STYLE
TEXT ([label])
LABEL
ANGLE [label_angle]
COLOR [label_color]
OUTLINECOLOR [label_olcolor]
PRIORITY [label_priority]
SIZE [label_size]
FONT 'name' # in FONTSET
END #LABEL
END # CLASS
How difficult would it be to have attribute binding for SYMBOL and
FONT? I suppose I could use mapscript, but I'd rather not.
Thanks!
Brent Fraser
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Assefa Yewondwossen
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Email: ass...@dmsolutions.ca
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