Re: gEDA-user: pcb flip-sides

[Peter Clifton <pcjc2@xxxxxxxxx>]

On Thu, 2009-10-29 at 20:30 -0400, DJ Delorie wrote:
> Try this board:
> 
>     http://www.delorie.com/pcb/m3a/board.pcb
> 
> It has multiple layers per group, despite being only two sided.

That rendered funny (top via colours) until I "fiddled" with the layer
groups somehow.. looking at the resulting diff:

-Groups("7,8,c,1,3,4:2,5,6,9,10,s")
+Groups("1,3,4,7,8,c:2,5,6,9,10,s")

Are both valid?

Seemingly my GL rendering code can tell the difference. Any ideas why
the sequence would be different before / after the edit?

I'm assuming that I'm doing something dumb about testing which layer is
the "top" / "bottom". For 3D view, pads are drawn on every layer - but
on the top / bottom, they are drawn in the expected pad / backside
colour. The code to detect is something like this:

(Diff from when I added this "feature"):

@@ -1053,7 +1053,16 @@ SetPVColor_inlayer (PinTypePtr Pin, LayerTypePtr Layer, i
   else if (TEST_FLAG (FOUNDFLAG, Pin))
     color = PCB->ConnectedColor;
   else
-    color = Layer->Color;
+    {
+      int component = GetLayerGroupNumberByNumber (max_layer + COMPONENT_LAYER)
+      int solder    = GetLayerGroupNumberByNumber (max_layer + SOLDER_LAYER);
+
+      if (Layer == LAYER_PTR (component) || Layer == LAYER_PTR (solder))
+        color = (SWAP_IDENT == (Layer == LAYER_PTR (solder)))
+                  ? PCB->ViaColor : PCB->InvisibleObjectsColor;
+      else
+        color = Layer->Color;
+    }
 
   gui->set_color (Output.fgGC, color);
 }


Looks suspiciously like I'm muddling layer _groups_ and layer _numbers_
again, doesn't it...

I guess I need to identify whether the geiven layer "Layer" is a member
of the component or solder _group_.

Best wishes,

Peter C.


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