php3-mapscript and symbology

[John Hockaday]

Hi,

I have the same situation but a little bit different.  I want to draw
the symbol according to an attribute value and make the colour decided
by another attribute value in the shapefile table.  This is similar in
that it is a dynamic symbology and dynamic colouring.

I see from Steve's comments that I could have an annotation layer for
each symbol but how do I determine the colour according to an attribute
value?  Can someone supply an excerpt from a .map file or do I need
some code to do the dynamic stuff?


Johnh

> Date: Tue, 05 Sep 2000 12:11:14 -0500
> From: "Stephen Lime" <steve.lime at dnr.state.mn.us>

> Ok, here are some ideas:
> 
> - multiple symbols: I recently added the ability to overlay 2 symbols to the 
CVS version although
> useful for building more complex symbols it's not what you want. In your case 
you need to draw
> the layer mutiple times positioning the labels accordingly. Note I said 
labels. Symbols are always
> centered on the label point and labels can have varied positions. I am adding 
symbol offset control
> but it's not quite ready.
> 
> - dynamic symbols: What you describe is what I use annotation for. For 
example, in labeling road
> shields I use a base symbol (GIF image) and drop text over the top. Same can 
be done in your
> case. Use an annotation layer with a circle symbol. You'll have to experiment 
to find the symbol
> and font sizes that look good together.
> 
> Steve
> 
> Stephen Lime
> Internet Applications Analyst
> 
> Minnesota DNR
> 500 Lafayette Road
> St. Paul, MN 55155
> 651-297-2937
> 
> >>> "Doyon, Jean-Francois" <Jean-Francois.Doyon at CCRS.NRCan.gc.ca> 09/05/00 
10:40AM >>>
> Everyone,
> 
> Allright, I got the TTF Symbology going, turns out the .ttf file I was using
> had some
> problems with the encoding in it ... I had to switch it to Windows Unicode
> from
> Windows Symbol, abd boum, everything fell into place ! Took me long enough
> to
> figure that out though !
> 
> Now for some more advanced questions :
> 
> Can I have multiple symbols for one point ? I have a city let's say, but I
> want
> 3 symbols around it ... Can this be done ?
> 
> How do I create dynamic symbols ? I would like to create circles that
> contain
> a number, only this number will vary (Number of hits from a search, I'm
> mapping
> search results here). I vaguely recall seeing talk about this on the list,
> but I 
> can't find anything about it anymore :) And can I use a TTF symbol to do
> this ?
> Or do I have to create independent symbols for each possiblity ?
> 
> Thanks !
> J.F.
> 
> 
> > ----------
> > From: 	Doyon,
> > Jean-Francois[SMTP:Jean-Francois.Doyon at CCRS.NRCan.gc.ca] 
> > Sent: 	Thursday, August 31, 2000 4:43 PM
> > To: 	mapserver-users at lists.gis.umn.edu 
> > Subject: 	php3-mapscript and TTF Symbology
> > 
> > Hello AGAIN :)
> > 
> > Allright, got the projection stuff going great, thanks again :)
> > 
> > Now I'm trying to get TTF Symbology working, and am running
> > into some problems.
> > 
> > I'm using a file called "geosymb.ttf", no idea where it came from.
> > 
> > Then I define in marker.sym
> > 
> > Symbol
> > Name 'capital'
> > Type TrueType
> > Filled
> > Antialias
> > Character "e"
> > END
> > 
> > But nothing shows up ! Ever ! Even stranger, sometimes ALL my TTF stuff
> > disappears off the chart (All city names and their symbols, which are
> > vectors, I'm just
> > trying to change the symbol on ONE city). In some instances, it seems that
> > everything
> > within a certain radius (the bigger the symbol size, the more disappears)
> > of
> > the said city
> > disappears ! Things also seem to behave differently depending on
> > extent/zoom
> > level. 
> > Basically, the minute I try to put a TTF symbol in there things go bezerk.
> > 
> > The Text (Labelling) is TTF, and that's been working fine all along.
> > 
> > I even tried using my arial.ttf file (Which I use for labeling) to do
> > symbols, but ... same thing.
> > 
> > This is the TOP layer BTW, (i.e. the last one to be added) if that makes a
> > difference.
> > 
> > Oh , an dI've of course tried a variety of "Character" ... Also, when
> > windows says a character
> > is "Alt+0168", how do I use that with a symbol file ???
> > 
> > Anybody have any problems with this ? Any idea what I'm doing wrong ?
> > 
> > Maybe I'll go try it with the Perl version if I have some time tomorrow
> > ...
> > 
> > Thanks again, and again, and again ...
> > 
> > 
> > 
>