Index: comm_thermal.lht
===================================================================
--- comm_thermal.lht	(revision 16819)
+++ comm_thermal.lht	(revision 16820)
@@ -1,12 +1,16 @@
 ha:lht_tree_doc { ha:comm {
 
 	ha:thermal_heavy {
-		type=ha
+		name=thermal
+		type=li
 		hide=1
-		desc { optional thermal flags for heavy terminals }
-		TODO
+		desc { list of thermal flags for heavy terminals, on the single layer the object is on }
 		li:children {
-			ha:attrib-key { valtype=string; desc={attribute value}}
+			ha:on      { valtype=none; desc={draw any thermal only if this string is present; else normal clearance is applied}}
+			ha:diag    { valtype=none; desc={if present, the thermal is diagonal (45 degree rotated)}}
+			ha:round   { valtype=none; desc={if present, thermal shape is rounded}}
+			ha:sharp   { valtype=none; desc={if present, thermal shape is sharp}}
+			ha:solid   { valtype=none; desc={if present, there is no thermal but a solid connection ("join")}}
 		}
 	}
 
Index: tree.html
===================================================================
--- tree.html	(revision 16819)
+++ tree.html	(revision 16820)
@@ -158,8 +158,12 @@
 <tr><td> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ha:attributes <td> &nbsp; <td> &nbsp; <td>  a hash of attribute key=value pairs 
 <tr><td> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;attrib-key <td> string <td> &nbsp; <td> attribute value
 <tr><td> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;flags_line <td> &nbsp; <td> &nbsp; <td> 
-<tr><td> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ha:thermal_heavy <td> &nbsp; <td> &nbsp; <td>  optional thermal flags for heavy terminals 
-<tr><td> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;attrib-key <td> string <td> &nbsp; <td> attribute value
+<tr><td> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;li:thermal <td> &nbsp; <td> &nbsp; <td>  list of thermal flags for heavy terminals, on the single layer the object is on 
+<tr><td> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;on <td> none <td> &nbsp; <td> draw any thermal only if this string is present; else normal clearance is applied
+<tr><td> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;diag <td> none <td> &nbsp; <td> if present, the thermal is diagonal (45 degree rotated)
+<tr><td> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;round <td> none <td> &nbsp; <td> if present, thermal shape is rounded
+<tr><td> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;sharp <td> none <td> &nbsp; <td> if present, thermal shape is sharp
+<tr><td> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;solid <td> none <td> &nbsp; <td> if present, there is no thermal but a solid connection ("join")
 <tr><td> &nbsp;&nbsp;&nbsp;&nbsp;ha:arc.ID <td> &nbsp; <td> &nbsp; <td> round cap elliptic arc (only width==height is fully supported at the moment)
 <tr><td> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;x <td> coord <td> &nbsp; <td> center, X coord
 <tr><td> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;y <td> coord <td> &nbsp; <td> center, Y coord
@@ -172,15 +176,23 @@
 <tr><td> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ha:attributes <td> &nbsp; <td> &nbsp; <td>  a hash of attribute key=value pairs 
 <tr><td> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;attrib-key <td> string <td> &nbsp; <td> attribute value
 <tr><td> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;flags_arc <td> &nbsp; <td> &nbsp; <td> 
-<tr><td> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ha:thermal_heavy <td> &nbsp; <td> &nbsp; <td>  optional thermal flags for heavy terminals 
-<tr><td> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;attrib-key <td> string <td> &nbsp; <td> attribute value
+<tr><td> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;li:thermal <td> &nbsp; <td> &nbsp; <td>  list of thermal flags for heavy terminals, on the single layer the object is on 
+<tr><td> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;on <td> none <td> &nbsp; <td> draw any thermal only if this string is present; else normal clearance is applied
+<tr><td> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;diag <td> none <td> &nbsp; <td> if present, the thermal is diagonal (45 degree rotated)
+<tr><td> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;round <td> none <td> &nbsp; <td> if present, thermal shape is rounded
+<tr><td> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;sharp <td> none <td> &nbsp; <td> if present, thermal shape is sharp
+<tr><td> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;solid <td> none <td> &nbsp; <td> if present, there is no thermal but a solid connection ("join")
 <tr><td> &nbsp;&nbsp;&nbsp;&nbsp;ha:polygon.ID <td> &nbsp; <td> &nbsp; <td> polygon, as drawn (unclipped)
 <tr><td> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;clearance <td> coord <td> >=3 <td> copper clearance around the object 
 <tr><td> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ha:attributes <td> &nbsp; <td> &nbsp; <td>  a hash of attribute key=value pairs 
 <tr><td> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;attrib-key <td> string <td> &nbsp; <td> attribute value
 <tr><td> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;flags_polygon <td> &nbsp; <td> &nbsp; <td> 
-<tr><td> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ha:thermal_heavy <td> &nbsp; <td> &nbsp; <td>  optional thermal flags for heavy terminals 
-<tr><td> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;attrib-key <td> string <td> &nbsp; <td> attribute value
+<tr><td> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;li:thermal <td> &nbsp; <td> &nbsp; <td>  list of thermal flags for heavy terminals, on the single layer the object is on 
+<tr><td> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;on <td> none <td> &nbsp; <td> draw any thermal only if this string is present; else normal clearance is applied
+<tr><td> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;diag <td> none <td> &nbsp; <td> if present, the thermal is diagonal (45 degree rotated)
+<tr><td> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;round <td> none <td> &nbsp; <td> if present, thermal shape is rounded
+<tr><td> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;sharp <td> none <td> &nbsp; <td> if present, thermal shape is sharp
+<tr><td> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;solid <td> none <td> &nbsp; <td> if present, there is no thermal but a solid connection ("join")
 <tr><td> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;li:geometry <td> &nbsp; <td> &nbsp; <td> first item is the outer contour, subsequent, optional items are holes
 <tr><td> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;contour <td> coordtbl <td> &nbsp; <td> 2 column table of x;y coords for the outer contour
 <tr><td> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;hole <td> coordtbl <td> &nbsp; <td> 2 column table of x;y coords for a hole
Index: tree.txt
===================================================================
--- tree.txt	(revision 16819)
+++ tree.txt	(revision 16820)
@@ -155,8 +155,12 @@
      ha:attributes                   a hash of attribute key=value pairs
       attrib-key        string       attribute value
      flags_line                   
-     ha:thermal_heavy                optional thermal flags for heavy terminals
-      attrib-key        string       attribute value
+     li:thermal                      list of thermal flags for heavy terminals, on the single layer the object is on
+      on                none         draw any thermal only if this string is present; else normal clearance is applied
+      diag              none         if present, the thermal is diagonal (45 degree rotated)
+      round             none         if present, thermal shape is rounded
+      sharp             none         if present, thermal shape is sharp
+      solid             none         if present, there is no thermal but a solid connection ("join")
     ha:arc.ID                        round cap elliptic arc (only width==height is fully supported at the moment)
      x                  coord        center, X coord
      y                  coord        center, Y coord
@@ -169,15 +173,23 @@
      ha:attributes                   a hash of attribute key=value pairs
       attrib-key        string       attribute value
      flags_arc                    
-     ha:thermal_heavy                optional thermal flags for heavy terminals
-      attrib-key        string       attribute value
+     li:thermal                      list of thermal flags for heavy terminals, on the single layer the object is on
+      on                none         draw any thermal only if this string is present; else normal clearance is applied
+      diag              none         if present, the thermal is diagonal (45 degree rotated)
+      round             none         if present, thermal shape is rounded
+      sharp             none         if present, thermal shape is sharp
+      solid             none         if present, there is no thermal but a solid connection ("join")
     ha:polygon.ID                    polygon, as drawn (unclipped)
      clearance          coord    >=3 copper clearance around the object
      ha:attributes                   a hash of attribute key=value pairs
       attrib-key        string       attribute value
      flags_polygon                
-     ha:thermal_heavy                optional thermal flags for heavy terminals
-      attrib-key        string       attribute value
+     li:thermal                      list of thermal flags for heavy terminals, on the single layer the object is on
+      on                none         draw any thermal only if this string is present; else normal clearance is applied
+      diag              none         if present, the thermal is diagonal (45 degree rotated)
+      round             none         if present, thermal shape is rounded
+      sharp             none         if present, thermal shape is sharp
+      solid             none         if present, there is no thermal but a solid connection ("join")
      li:geometry                     first item is the outer contour, subsequent, optional items are holes
       contour           coordtbl     2 column table of x;y coords for the outer contour
       hole              coordtbl     2 column table of x;y coords for a hole