[mapserver-users] multiple highway shields on a single line

[Richard Greenwood]

Steve & Steve,

Very interesting discussion. I wish I had more to contribute. My use
case, which I don't think is unique, seems like it might fall between
your respective ideas. I'd like to have 4 highway shields with labels
near the mid point of the visible portion of a single line segment,
with the shields & labels on the line (not side-by-side), and grouped
relatively close to one another. I envision this as a single label
point with a BUFFER.

So assuming no label collisions from other objects, I have a single
line which curves at the mid point of the visible extent. That mid
point is the single label base point. I set BUFFER 4. So a
shield/label is placed 2 pixels up the line from the base point,
another shield/label +4 pixels beyond that, a shield/label 2 pixels
down the line from the base point and another +4 pixels on down the
line. Sorry, I think that deserves a graphic.

Rich

On Wed, Oct 19, 2011 at 3:43 PM, Stephen Woodbridge
<woodbri at swoodbridge.com> wrote:
> Steve,
>
> Maybe this is another RFC, but I think more flexibility in defining the
> label point is needed. Also it would be nice it each label could have its
> own label point say through the use of GEOMPROCESSING function.
>
> So here are some ideas for defining label points and ANGLE AUTO or FOLLOW.
>
> For lines:
>
> 1. n% along line, centered on the line
> 2. n% along line, offset normal to line right or left some distance
> 3. n% along line, offset N,S,E,W some distance
>
> For polygons:
>
> 1. Along polygon edge, offset inside or outside of polygon, could used ANGLE
> AUTO or FOLLOW, could allow REPEATDISTANCE
>
> -Steve W
>
>
> On 10/19/2011 2:22 PM, Steve Lime wrote:
>>
>> As an FYI... I am working on a RFC to support multiple labels within a
>> class although by itself I don't know that it solves this particular
>> problem. It has application if for example you wanted to show two or
>> three shields side-by-side (one label point w/offsets).
>>
>> I think being able to offset the starting position for repeating
>> labels would be another way to address this type of labeling. Recall
>> that REPEATDISTANCE was added in 6.0 so I'm thinking of adding
>> REPEATOFFSET [distance].
>>
>> Steve
>>
>> On Tue, Oct 18, 2011 at 9:00 PM, Stephen Woodbridge
>> <woodbri at swoodbridge.com>  wrote:
>>>
>>> Rich,
>>>
>>> You might want to look at these bugs and add yourself to the CC and
>>> comment
>>> on your use case.
>>>
>>> http://trac.osgeo.org/mapserver/ticket/3675
>>> http://trac.osgeo.org/mapserver/ticket/3044
>>>
>>> -Steve W
>>>
>>> On 10/18/2011 8:18 PM, Richard Greenwood wrote:
>>>>
>>>> Steve, Bob,
>>>>
>>>> Thanks for the ideas. Steve - As I was composing my email I was
>>>> thinking that there was a good chance that you'd have suggestions and
>>>> as always I appreciate your help. Bob - I haven't gotten far enough to
>>>> get stuck yet! I'm just trolling for ideas from folks that have more
>>>> experience with advanced labeling than myself.
>>>>
>>>> Thanks,
>>>> Rich
>>>>
>>>>
>>>> On Tue, Oct 18, 2011 at 3:43 PM, Bob Basques
>>>> <Bob.Basques at ci.stpaul.mn.us>    wrote:
>>>>>
>>>>> Richard,
>>>>>
>>>>> Not impossible, I don't think.
>>>>>
>>>>> Forcing them all on will be the trick,  How to avoid collisions while
>>>>> still forcing all the labels on.
>>>>>
>>>>> As far as the labels themselves, that's fairly straight forward.  You
>>>>> should be able to build a CLASS for each Shield label.  I assume you
>>>>> have
>>>>> some sort of attribute on the line work that indicates that all those
>>>>> shields apply?  Or possibly a line segment per Shield for labeling?
>>>>>
>>>>> where are you stuck?
>>>>>
>>>>> bobb
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>>>> Richard Greenwood<richard.greenwood at gmail.com>    wrote:
>>>>>
>>>>> I have an area where 4 numbered US highways are coincident (all
>>>>> following the same road) that I would like to label with the standard
>>>>> US highway shield superimposed with the individual route numbers as
>>>>> shown on the attached gif. Any suggestions as to how to accomplish
>>>>> this?
>>>>>
>>>>> Thanks,
>>>>> Rich
>>>>>
>>>>> --
>>>>> Richard Greenwood
>>>>> richard.greenwood at gmail.com
>>>>> www.greenwoodmap.com
>>>>
>>>>
>>>>
>>>> --
>>>> Richard Greenwood
>>>> richard.greenwood at gmail.com
>>>> www.greenwoodmap.com
>>>
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>>>
>
>



-- 
Richard Greenwood
richard.greenwood at gmail.com
www.greenwoodmap.com