Updated DRC documentation

src/drc/drc/built-in-macros/_drc_cop_integration.rb

@@ -1048,11 +1048,30 @@ CODE
     # out = in.drc(0.1.um <= width < 0.2.um)
     # @/code
     #
-    # With a lower and upper limit, the results are edges marking the positions on the 
+    # @table
+    #   @tr 
+    #     @td @img(/images/drc_width1u.png) @/td
+    #     @td @img(/images/drc_width2u.png) @/td
+    #   @/tr
+    # @/table
+    #
+    # With a lower and upper limit or with the "equal" condition, the results are edges marking the positions on the 
     # primary shape where the condition is met.
     # With a lower limit alone, these markers are formed by two, identical but opposite edges attached to 
     # the primary shape. Without an upper limit only, both edges are attached to different sides of the primary
     # shape.
+    #
+    # @table
+    #   @tr 
+    #     @td @img(/images/drc_width3u.png) @/td
+    #     @td @img(/images/drc_width4u.png) @/td
+    #   @/tr
+    #   @tr 
+    #     @td @img(/images/drc_width5u.png) @/td
+    #     @td @img(/images/drc_width6u.png) @/td
+    #   @/tr
+    # @/table
+    #
     
     # %DRC%
     # @name space

src/drc/drc/built-in-macros/_drc_layer.rb

@@ -2983,6 +2983,8 @@ CODE
     # On polygon layers, the polygons on each layer are checked for locations where their
     # width is less than the specified value. In that case, an edge pair error shape is generated.
     # 
+    # @h3 Options @/h3
+    #
     # The options available are:
     #
     # @ul
@@ -3029,6 +3031,8 @@ CODE
     #   markers = in.width(20.nm)
     # @/code
     #
+    # @h3 Examples @/h3
+    #
     # The following images show the effect of various forms of the width check:
     # 
     # @table
@@ -3042,6 +3046,17 @@ CODE
     #   @/tr
     # @/table
     #
+    # @h3 Universal DRC function @/h3
+    #
+    # There is an alternative notation for the check using the "universal DRC" function ("\Layer#drc"). 
+    # This notation is more intuitive and allows checking for widths bigger than a certain value 
+    # or within a certain range. 
+    #
+    # Apart from that it provides the same options than the plain width check. 
+    # Follow this link for the documentation of this feature: \global#width.
+    #
+    # @h3 Shielding @/h3
+    #
     # "shielding" is a concept where an internal or external distance is measured only 
     # if the opposite edge is not blocked by other edges between. Shielded mode makes 
     # a difference if very large distances are to be checked and the minimum distance

src/lay/lay/doc/about/drc_ref_global.xml

@@ -1591,11 +1591,29 @@ out = in.drc(width != 0.2.um)
 out = in.drc(0.1.um <= width < 0.2.um)
 </pre>
 </p><p>
-With a lower and upper limit, the results are edges marking the positions on the 
+<table>
+<tr>
+<td><img src="/images/drc_width1u.png"/></td>
+<td><img src="/images/drc_width2u.png"/></td>
+</tr>
+</table>
+</p><p>
+With a lower and upper limit or with the "equal" condition, the results are edges marking the positions on the 
 primary shape where the condition is met.
 With a lower limit alone, these markers are formed by two, identical but opposite edges attached to 
 the primary shape. Without an upper limit only, both edges are attached to different sides of the primary
 shape.
+</p><p>
+<table>
+<tr>
+<td><img src="/images/drc_width3u.png"/></td>
+<td><img src="/images/drc_width4u.png"/></td>
+</tr>
+<tr>
+<td><img src="/images/drc_width5u.png"/></td>
+<td><img src="/images/drc_width6u.png"/></td>
+</tr>
+</table>
 </p>
 <a name="write_spice"/><h2>"write_spice" - Defines SPICE output format (with options)</h2>
 <keyword name="write_spice"/>

src/lay/lay/doc/about/drc_ref_layer.xml

@@ -2804,6 +2804,8 @@ value, an error shape is generated for that edge pair.
 On polygon layers, the polygons on each layer are checked for locations where their
 width is less than the specified value. In that case, an edge pair error shape is generated.
 </p><p>
+<h3>Options </h3>
+</p><p>
 The options available are:
 </p><p>
 <ul>
@@ -2850,6 +2852,8 @@ markers = in.width(2.um)
 markers = in.width(20.nm)
 </pre>
 </p><p>
+<h3>Examples </h3>
+</p><p>
 The following images show the effect of various forms of the width check:
 </p><p>
 <table>
@@ -2863,6 +2867,17 @@ The following images show the effect of various forms of the width check:
 </tr>
 </table>
 </p><p>
+<h3>Universal DRC function </h3>
+</p><p>
+There is an alternative notation for the check using the "universal DRC" function ("<a href="/about/drc_ref_layer.xml#drc">Layer#drc</a>"). 
+This notation is more intuitive and allows checking for widths bigger than a certain value 
+or within a certain range. 
+</p><p>
+Apart from that it provides the same options than the plain width check. 
+Follow this link for the documentation of this feature: <a href="/about/drc_ref_global.xml#width">width</a>.
+</p><p>
+<h3>Shielding </h3>
+</p><p>
 "shielding" is a concept where an internal or external distance is measured only 
 if the opposite edge is not blocked by other edges between. Shielded mode makes 
 a difference if very large distances are to be checked and the minimum distance

src/lay/lay/layDRCLVSHelpResources.qrc

@@ -4,6 +4,12 @@
   <file alias="drc_width2.png">doc/images/drc_width2.png</file>
   <file alias="drc_width3.png">doc/images/drc_width3.png</file>
   <file alias="drc_width4.png">doc/images/drc_width4.png</file>
+  <file alias="drc_width1u.png">doc/images/drc_width1u.png</file>
+  <file alias="drc_width2u.png">doc/images/drc_width2u.png</file>
+  <file alias="drc_width3u.png">doc/images/drc_width3u.png</file>
+  <file alias="drc_width4u.png">doc/images/drc_width4u.png</file>
+  <file alias="drc_width5u.png">doc/images/drc_width5u.png</file>
+  <file alias="drc_width6u.png">doc/images/drc_width6u.png</file>
   <file alias="drc_space1.png">doc/images/drc_space1.png</file>
   <file alias="drc_space2.png">doc/images/drc_space2.png</file>
   <file alias="drc_space3.png">doc/images/drc_space3.png</file>