Anti Aliasing

[Steve Lime]

There in lies a problem- you can't. I have been working on it off and on and I do believe that we can do away with TRANSPARENCY ALPHA altogether. We know enough at rendering time to enable alpha blending or not at the feature level and that would leave us using transparency just at the layer level so we get the best of both. There were some image merging issues that I ran into that kept me from committing this for 4.8- hopefully in the next release.

Steve

>>> Vincent Schut <schut at SARVISION.NL> 05/16/06 4:28 AM >>>
Steve Lime wrote:
> You need a couple of other things:
> 
>   - a 24-bit output format (e.g. IMAGETYPE PNG24)
>   - alpha blending turned on for the layer (e.g. TRANSPARENCY ALPHA)
> 
> That should get it working...

To chime in:
But what if I want to have antialiasing *and* semi-transparency? How
would I define e.g. a opacity of 60 when I already have 'transparency
alpha' in my layer?

Vincent.

> 
> Steve
> 
> Stephen Lime
> Data & Applications Manager
> 
> Minnesota DNR
> 500 Lafayette Road
> St. Paul, MN 55155
> 651-259-5473
>>>> ramesh karra <karrarm at YAHOO.COM> 05/15/06 6:49 PM >>>
> Hi,
> 
> I have added 'ANTIALIAS TRUE' to all my STYLE objects
> but I do not see any difference in the map that's
> displayed. I was hoping to see smooth lines but there
> was no difference in the way lines(representing roads)
> are drawn with or without anti-aliasing. Is this the
> expected behavior? How can I get smooth lines?
> 
> My layer is defined as follows:
> 
> LAYER  
>     NAME         roads
>     DATA         droad1
>     STATUS       OFF
>     TYPE         LINE
> 
>     PROJECTION
>  	 "init=epsg:4326"
>     END 
>   
>     CLASS
>       NAME       "Roads"
>       MAXSCALE     80000
>       MINSCALE     20000
>       STYLE
> 	ANTIALIAS    TRUE
> 	COLOR	     150 150 150
> 	WIDTH        3
>       END  
>       STYLE
> 	ANTIALIAS    TRUE
>         COLOR	     255 255 255
> 	WIDTH        1
>       END   
>     END
> END
> 
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