[mapserver-dev] Label Position Auto change?

[Stephen Woodbridge]

Ok, great minds think alike :)

I inadvertently set POSITION CC on an annotation layer and then spent 
1/2 hour trying to figure out why my symbols disappeared. I hate when I 
do that!

Anyway, thanks for pointing out the ticket, I added myself to the CC. 
This would be very nice to add to the other label enhancements that are 
getting done, but sounds like it will have to wait.

Thanks,
   -Steve W

On 2/24/2012 5:32 PM, Lime, Steve D (DNR) wrote:
> The label cache code doesn't use CC if labeling points or polygons w/styles. Probably needs tweaking given label style support. Here's the current logic:
>
> if(layerPtr->type == MS_LAYER_POLYGON || (layerPtr->type == MS_LAYER_ANNOTATION&&  cachePtr->shapetype == MS_SHAPE_POLYGON&&  cachePtr->numstyles == 0)) {
>    positions[0]=MS_CC; positions[1]=MS_UC; positions[2]=MS_LC; positions[3]=MS_CL; positions[4]=MS_CR;
>    npositions = 5;
> } else if(layerPtr->type == MS_LAYER_LINE || (layerPtr->type == MS_LAYER_ANNOTATION&&  cachePtr->shapetype == MS_SHAPE_LINE&&  cachePtr->numstyles == 0)) {
>    positions[0]=MS_UC; positions[1]=MS_LC; positions[2]=MS_CC;
>    npositions = 3;
> } else {
>    positions[0]=MS_UL; positions[1]=MS_LR; positions[2]=MS_UR; positions[3]=MS_LL; positions[4]=MS_CR; positions[5]=MS_CL; positions[6]=MS_UC; positions[7]=MS_LC;
>    npositions = 8;
> }
>
> There's already a ticket (http://trac.osgeo.org/mapserver/ticket/2981) although I have no immediate plans to fix it...
>
> Steve
>
> -----Original Message-----
> From: mapserver-dev-bounces at lists.osgeo.org [mailto:mapserver-dev-bounces at lists.osgeo.org] On Behalf Of Stephen Woodbridge
> Sent: Friday, February 24, 2012 4:21 PM
> To: mapserver-dev
> Subject: [mapserver-dev] Label Position Auto change?
>
> Hi Thomas, Steve L,
>
> Would it be easy to change the labeling to either change the order of
> POSITION AUTO or to add a PROCESSING directive or some other mechanism
> to change the order.
>
> For example when labeling cities, I think it would look better if we
> followed an order like:
>
> Upper center
> Lower center
> Center right
> Center left
> Upper right
> Upper left
> Lower right
> Lower left
> Center center - this is bad if you have a symbol because it falls over
> the symbol, so I can see optionally leaving it out of the list.
>
> Obviously, not everyone will have this preference so some flexibility in
> defining the order would make sense.
>
> Another idea would be to do something like:
>
> POSITION "UC LC CR CL UR UL LR LL"  # to specify the order (note no CC)
>
> This would make it easy to pass the same via a binding.
>
> Does anyone have any thoughts on this? Cartography, technical, other?
>
> I will create an enhancement ticket and summarize this thread in it.
>
> Thanks,
>     -Steve W
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