[mapserver-users] Rendering Challenges

[Lime, Steve D (DNR)]

I've attached a patch against trunk that adds the difference function. It's untested, give it a whirl and
let me know how it goes... You'll have to re-build the lexer and parser.

Steve

-----Original Message-----
From: Brent Fraser [mailto:bfraser at geoanalytic.com] 
Sent: Tuesday, May 10, 2011 9:42 AM
To: Lime, Steve D (DNR)
Cc: mapserver-users at lists.osgeo.org
Subject: Re: [mapserver-users] Rendering Challenges

I think it would be very valuable....

Best Regards,
Brent Fraser


On 5/10/2011 8:25 AM, Lime, Steve D (DNR) wrote:
> I don't have a difference operator implemented. Wouldn't take much though...
>
> -----Original Message-----
> From: Brent Fraser [mailto:bfraser at geoanalytic.com]
> Sent: Tuesday, May 10, 2011 9:07 AM
> To: Lime, Steve D (DNR)
> Cc: mapserver-users at lists.osgeo.org
> Subject: Re: [mapserver-users] Rendering Challenges
>
> Using
>
>         STYLE
>           GEOMTRANSFORM "difference([shape],buffer([shape], -5))"
>           COLOR        255 211 127
>         END
>
> results in the entire original polygon being filled.
>
> Using
>           GEOMTRANSFORM (difference([shape],buffer([shape], -5)))
> results in no fill.
>
> Best Regards,
> Brent Fraser
>
>
> On 5/9/2011 4:20 PM, Lime, Steve D (DNR) wrote:
>> That's were a difference operator might come in handy since you're looking for more of a fill-type effect:
>>
>>     GEOMTRANSFORM (difference([shape], buffer([shape], -2)))
>>
>> or something like that.
>>
>> Steve
>>
>> -----Original Message-----
>> From: Brent Fraser [mailto:bfraser at geoanalytic.com]
>> Sent: Monday, May 09, 2011 5:18 PM
>> To: Lime, Steve D (DNR)
>> Cc: mapserver-users at lists.osgeo.org
>> Subject: Re: [mapserver-users] Rendering Challenges
>>
>> Steve L.,
>>
>>      Good point;  I couldn't do any of this in pre-6.0 either!
>>
>>      I tried the buffer and it worked great (but we might have to work on
>> the end-cap types in PDF output)! See http://i52.tinypic.com/2qjc9yv.jpg
>>
>> Best Regards,
>> Brent Fraser
>>
>>
>> On 5/9/2011 2:36 PM, Lime, Steve D (DNR) wrote:
>>> These aren't specific to 6.0 though- more of a wish list...
>>>
>>> Item 1 might be doable in 6.0 as it sits. In 6.0 a style GEOMTRANSFORM is really an expression and I exposed
>>> the GEOS buffer operator as a proof-of-concept. For example:
>>>
>>> STYLE
>>>      GEOMTRANSFORM (buffer([shape], -2))
>>>      OUTLINECOLOR 255 0 0
>>> END
>>>
>>> Should generate a single pixel red line on the inside of a polygon shape. You can render it however you'd like.
>>> Note that a GEOMTRANSFORM is performed AFTER a shape is converted from map to image coordinates so it's effective
>>> for rendering effects only.
>>>
>>> If we exposed a few others you'd be able to do some other interesting things (like fills just inside a line...).
>>>
>>> The rest of the ideas are interesting and worthy of discussion.
>>>
>>> Steve
>>>
>>> -----Original Message-----
>>> From: mapserver-users-bounces at lists.osgeo.org [mailto:mapserver-users-bounces at lists.osgeo.org] On Behalf Of Brent Fraser
>>> Sent: Monday, May 09, 2011 2:52 PM
>>> To: mapserver-users at lists.osgeo.org
>>> Subject: [mapserver-users] Rendering Challenges
>>>
>>>       While testing v6, I can up with the following list of things I
>>> couldn't do (see http://i56.tinypic.com/8vvprn.png for a graphic):
>>>
>>> 1. Render lines inside polygon boundary (with or without opacity)
>>> 2. Place polygon annotation on/inside boundary line
>>> (http://trac.osgeo.org/mapserver/ticket/1592 point 8.)
>>> 3. Rotate anno if required to fit inside a polygon
>>> 4. Place polygon annotation outside polygon if anno doesn't fit inside
>>> 5. Place line anno above (or below) when using ANGLE FOLLOW
>>> 6. Rotate vector symbols to follow lines (a font might work but is a
>>> pain to create)
>>> 7. User specified character spacing
>>> 8. Erase lines (but not other objects) under annotation
>>>
>>>       My goal was to use the published shp files
>>> (http://ftp2.cits.rncan.gc.ca/pub/canvec/50k_shp/092/h/canvec_092h06_shp.zip)
>>> without modification and see how close I could get to the published PDF
>>> (http://ftp2.cits.rncan.gc.ca/pub/cantopo/50k_geopdf/092/h/cantopo_092h06_geopdf.zip).
>>>
>>>
>>>       Any suggested rendering techniques are appreciated.  I'll file
>>> tickets for those problems deemed worthy.
>>>
>>
>>
>
>
>


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