Within a layer objects are always drawn in the order they are delivered
from the datasource. Think of the CLASSes are an IF-ELSEIF-BLOCK, when
an object is presented each CLASS is tested and the first one the
accepts the object renders it.
I often up a default class at then end that has no expression ans render
it in red just so I can see if I missed any cases, but remove it when
I'm done developing the mapfile.
-Steve W
On 1/21/2017 8:48 PM, Stefanos Anastasiou wrote:
Hi list,
according to the documentation, the first layer in the mapfile is
drawn first, and the second is drawn on top of that and so on... I was
wondering if the same principle applies to the CLASS object as well. For
example: I have a "Roads" layer stored in PostGIS with a "Category"
column representing the different types of roads. So a category 3 is
very small roads, category 2 is city roads, 1 is major roads and 0 is
highways and on the same layers I create four CLASS objects with
different styles for each Road category. But regardless the order of the
classes (either I draw the small roads first or the highways) the same
effect insists: the small roads are drawn over the highways. So what
is the solution here? Create different layers of the same dataset
representing the various values of the "Category" column ??
Regards,
-Stefanos
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