Blaise
I am working with shapefiles - but am going to need to do this with all
different types of layers (trying to abstract it out). I have just added
the 'angle' field to the dbf to try it out and I am still getting the
same error.
It seems that the styleObj thinks it doesn't have the member of 'angle'
(or actualy 'angleitem') even though in my mapfile (which I
automatically output by using $map->save) it has written it like this:
STYLE
ANGLE 360
COLOR 0 0 0
SIZE 8
SYMBOL "rot_tri"
END
I am now trying to go through the process of automatically creating the
rotated symbol on the fly (but the logic of it makes my head hurt!).
Thanks for your help so far!
Stu
Blaise wrote:
Hi Stu
What kind of layer do you use for your symbols, point or annotation ? I assume
it's a shapefile (*.shp, *.shx, *.dbf) isn't it ? I don't remember exactly
how annotation layers work but it must be the same as point. With point
layers, you have to have an "angle" field (numeric, 3 digits without decimal,
I believe, not sure) in your dbf file, or maybe better "ANGLE" to be able to
set the angle. Do you have this field in the dbf and if not can you try
adding it ?
And do you have the right angle instructions in the layer section of your
mapfile ? If not sure, post your mapfile layer section.
Bravo for the work so far.
Blaise
Le Samedi 27 Mai 2006 16:58, Stuart Eve a écrit :
Hi Blaise
I have managed to get quite a long way down the road of extracting
points and placing them, etc.- and I think its all going to work -
however I have just been stumped by what seems to be to be a bug.
I have managed to set up classes for each of the points that I wish to
draw - and now want to set their styles so that the symbol (a VECTOR)
symbol is rotated to the angle (which I have got from my geometry
function). However, whenever I try to access styleObj->set("angle",45)
it says that 'angle' doesn't exist in that object. However, I can dump
out the mapfile and it is there set as 360.
Any ideas whats going on?
Thanks
Stu
Blaise wrote:
Stu
I don't know what output you want exactly, but yes, using mapscript, you
can easily put an arrow on each segment of a polyline with a loop
something like :
for each polyline
for each segment of polyline
get start and stop point of segment
calculate middle point of segment and angle
create new annotation arrow
The geometry calculation is pretty straight forward, it's basic 2d
geometry. Ask more if you need help on the mapscript functions and/or the
geometry calculation.
But maybe someone else on this list has got a better/different idea.
Regards
Blaise
Le Vendredi 26 Mai 2006 16:41, vous avez écrit :
Blaise
Thanks for the reply. I presume that we could automatically create a
bunch of points along the line using mapscript or something - but then
how would we make sure that it was always at right angles to the line? I
guess we would have to do some fancy geometry to figure out what angle
that section of line was... sounds hard!
Mind you it may be the only way - thanks for your help!
Stu
Blaise wrote:
Le Vendredi 26 Mai 2006 16:23, Stuart Eve a écrit :
Dear All,
We have been trying to get symbols to rotate along a line in mapserver
(4.8.3). Basically we want to get a small triangle pointing either 45
degrees or 270 degrees to a line.
We firstly tried using PIXMAPs - but I don;t think its possible to
rotate these at all (is that true?) plus they do not seem to follow
the line and always just point 'up'.
So we then tried using some truetype symbols - these follow the line -
but seem to be rather erratic as to which way they point. We are using
a small triangle from the webdings.ttf set - and sometimes it will
point up and sometimes it will point down (but even if its on the same
section of the line).
Does anyone have any pointers?
Thanks in advance
Stu
Hi Stu
Well, not sure about that, but sometimes it's hard to have the symbols
exactly where you want. Perhaps you could create a special layer (point
or annotation) to deal with your triangles. It should then be easier to
manipulate. Of course it's extra data, extra code, extra mapfile
parsing and so on but you'll have your symbols where you want and well
rotated. Regards
Blaise
--
Stuart Eve
L - P : Archaeology
[EMAIL PROTECTED]
