decompose all the mess around the resistor symbol

src/symbol/ansi/common/icons.coffee

@@ -1,16 +1,22 @@
-Icon = require '../../default/common/icon'
-
 #
 # Resistor
 #
-class ResistorIcon extends Icon
+class ResistorIcon
   constructor: (symbol, element) ->
-    super symbol, element, width=10, height=4
+    @symbol=symbol
+    @element=element
+    width=10
+    height=4
+
+    @schematic = @element.schematic
+    @settings = @symbol.settings
+    @width = width * @settings.factor
+    @height = height * @settings.factor
     @d =
       w: @width
       h: @height
       d: @height/4
-    if @schematic.trimpot
+    if @schematic.trimpot || @schematic.potentiometer
       @height = 2*@height + @d.d
       @y1 = -@height/2 - @d.d
       @y2 = @height/2
@@ -18,7 +24,6 @@ class ResistorIcon extends Icon
   draw: (x, y) ->
     settings = @symbol.settings
     @symbol
-      .lineWidth @lineWidth/2
       .center x, y # Set center to (x, y)
       .line -@d.w/2, 0, (-@d.w/2)*(5/6), -@d.h/2
       .line (-@d.w/2)*(5/6), -@d.h/2, (-@d.w/2)*(3/6), @d.h/2