Index: trunk/src/change.c
===================================================================
--- trunk/src/change.c	(revision 12398)
+++ trunk/src/change.c	(revision 12399)
@@ -40,6 +40,7 @@
 #include "hid_actions.h"
 #include "compat_nls.h"
 #include "obj_all_op.h"
+#include "obj_padstack_op.h"
 #include "obj_subc_parent.h"
 #include "obj_term.h"
 
@@ -115,7 +116,7 @@
 	NULL,
 	NULL,
 	NULL, /* subc */
-	NULL  /* padstack */
+	pcb_padstackop_change_thermal
 };
 
 pcb_opfunc_t ChangeClearSizeFunctions = {
Index: trunk/src/obj_padstack.c
===================================================================
--- trunk/src/obj_padstack.c	(revision 12398)
+++ trunk/src/obj_padstack.c	(revision 12399)
@@ -350,4 +350,15 @@
 	return 0;
 }
 
+void pcb_padstack_set_thermal(pcb_padstack_t *ps, unsigned long lid, unsigned char shape)
+{
+	if (ps->thermal.used <= lid) {
+		unsigned long oldu = ps->thermal.used;
+		ps->thermal.used = lid+1;
+		ps->thermal.shape = realloc(ps->thermal.shape, ps->thermal.used);
+		memset(ps->thermal.shape + oldu, 0, ps->thermal.used - oldu - 1);
+	}
+	ps->thermal.shape[lid] = shape;
+}
+
 #include "obj_padstack_op.c"
Index: trunk/src/obj_padstack.h
===================================================================
--- trunk/src/obj_padstack.h	(revision 12398)
+++ trunk/src/obj_padstack.h	(revision 12399)
@@ -32,7 +32,7 @@
 	pcb_coord_t x, y;
 	struct {
 		unsigned long used;
-		char *shape;                 /* indexed by layer ID */
+		unsigned char *shape;        /* indexed by layer ID */
 	} thermal;
 	gdl_elem_t link;               /* a padstack is in a list in pcb_data_t as a global object */
 };
@@ -112,6 +112,7 @@
 void pcb_padstack_add(pcb_data_t *data, pcb_padstack_t *ps);
 void pcb_padstack_bbox(pcb_padstack_t *ps);
 
+void pcb_padstack_set_thermal(pcb_padstack_t *ps, unsigned long lid, unsigned char shape);
 
 /*** proto ***/
 
Index: trunk/src/obj_padstack_op.c
===================================================================
--- trunk/src/obj_padstack_op.c	(revision 12398)
+++ trunk/src/obj_padstack_op.c	(revision 12399)
@@ -138,3 +138,17 @@
 	return NULL;
 }
 
+void *pcb_padstackop_change_thermal(pcb_opctx_t *ctx, pcb_padstack_t *ps)
+{
+	pcb_undo_add_obj_to_clear_poly(PCB_TYPE_PADSTACK, ps, ps, ps, pcb_false);
+	pcb_poly_restore_to_poly(PCB->Data, PCB_TYPE_PADSTACK, CURRENT, ps);
+
+#warning TODO: undo + get PCB in ctx + get INDEXOFCURRENT/CURRENT in ctx
+	pcb_padstack_set_thermal(ps, INDEXOFCURRENT, ctx->chgtherm.style);
+
+	pcb_undo_add_obj_to_clear_poly(PCB_TYPE_PADSTACK, ps, ps, ps, pcb_true);
+	pcb_poly_clear_from_poly(PCB->Data, PCB_TYPE_PADSTACK, CURRENT, ps);
+	pcb_via_invalidate_draw(ps);
+	return ps;
+}
+
Index: trunk/src/obj_padstack_op.h
===================================================================
--- trunk/src/obj_padstack_op.h	(revision 12398)
+++ trunk/src/obj_padstack_op.h	(revision 12399)
@@ -34,7 +34,9 @@
 void *pcb_padstackop_remove(pcb_opctx_t *ctx, pcb_padstack_t *ps);
 void *pcb_padstackop_destroy(pcb_opctx_t *ctx, pcb_padstack_t *ps);
 
+void *pcb_padstackop_change_thermal(pcb_opctx_t *ctx, pcb_padstack_t *ps);
 
+
 /*** TODO: unimplemented ones ***/
 
 void *pcb_padstackop_change_size(pcb_opctx_t *ctx, pcb_padstack_t *ps);
@@ -41,7 +43,6 @@
 void *pcb_padstackop_change_2nd_size(pcb_opctx_t *ctx, pcb_padstack_t *ps);
 void *pcb_padstackop_change_clear_size(pcb_opctx_t *ctx, pcb_padstack_t *ps);
 
-void *pcb_padstackop_change_thermal(pcb_opctx_t *ctx, pcb_padstack_t *ps);
 void *pcb_padstackop_change_name(pcb_opctx_t *ctx, pcb_padstack_t *ps);
 
 void *pcb_padstackop_change_flag(pcb_opctx_t *ctx, pcb_padstack_t *ps);