class rendering order...

[Steve Lime]

Classes are not used to group features and then render. Instead features
are rendered in the order they are encountered in the data. You have a
couple of options:

  1) Sort the data somehow base on road type so that the features you
want drawn last are encountered last in the data (perhaps using
sortshp)
  2) separate the data into class specific datasets ahead of time (e.g.
highway shapefile, interstate shapefile)
  3) use separate layers

The last case requires multiple passes through the data which can be
expensive. However, it's easy to do so you can check the rendering
effect before committing to the pre-processing options...

Steve

>>> John Cole <john.cole at UAI.COM> 9/29/2006 12:12:06 PM >>>
Hello,
  I'm drawing roads with multiple symbols, for example, interstates:

CLASS
		EXPRESSION /A1[0-9]/
		NAME "Interstate" 
		STYLE 
		SYMBOL "circle" 
		SIZE 19
		COLOR
			168 137 31
		END 
		STYLE
			SYMBOL "circle" 
			SIZE 15
			COLOR 206 228 192 
		END 
	END

My issue is that the interstates weave above and below the lower
streets
(see attached image).  The street classes are above the interstate
class in
this layer.  Is there a way to get all of the styles to render above
the
other classes?

Thanks,

John

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