Index: trunk/src_plugins/io_kicad_legacy/HACKING
===================================================================
--- trunk/src_plugins/io_kicad_legacy/HACKING	(revision 2651)
+++ trunk/src_plugins/io_kicad_legacy/HACKING	(revision 2652)
@@ -16,10 +16,16 @@
 1. run pcb-rnd (from src/)
 2. load a pcb 
 3. open the command prompt (press ':')
-4. type: SaveTo(LayoutAs, foobar.mod, kicadl)
+4. type: SaveTo(PasteBuffer, foobar.mod, kicadl)
 
-This will save the current design to foobar.mod using io_kicad_legacy.
+Now, the gtk dialog "Buffer: save buffer elements to file" allows kicad legacy format to be selected.
 
+Arc and Circle support has been implemented but not fully tested.
+
+This will save the current PasteBuffer contents to foobar.mod using io_kicad_legacy format.
+
+Once layout export has been implemented, the following will be possible:
+ 
 How to run the plugin (CLI version):
 
 echo "SaveTo(LayoutAs, foobar.mod, kicadl)" | ./pcb-rnd  --gui batch my.pcb
Index: trunk/src_plugins/io_kicad_legacy/write.c
===================================================================
--- trunk/src_plugins/io_kicad_legacy/write.c	(revision 2651)
+++ trunk/src_plugins/io_kicad_legacy/write.c	(revision 2652)
@@ -221,11 +221,34 @@
 		}
 
 		linelist_foreach(&element->Arc, &it, arc) {
-			pcb_fprintf(FP, "DArc %.3mm %.3mm %.3mm %.3mm %.3ma %.3ma %.3mm]\n",
-									arc->X - element->MarkX,
-									arc->Y - element->MarkY, arc->Width, arc->Height, arc->StartAngle, arc->Delta, arc->Thickness);
+			if ((arc->Delta == 360) || (arc->Delta == -360)) { // it's a circle
+				pcb_fprintf(FP, "DC %.3mm %.3mm %.3mm %.3mm %.3mm ",
+					arc->X - element->MarkX, // x_1 centre
+					arc->Y - element->MarkY, // y_2 centre
+					(arc->X - element->MarkX + arc->Thickness/2), // x_2 on circle
+					arc->Y - element->MarkY,                  // y_2 on circle
+					arc->Thickness); // stroke thickness
+			} else {
+			// as far as can be determined from the Kicad documentation,
+			// http://en.wikibooks.org/wiki/Kicad/file_formats#Drawings
+			// 
+			// the origin for rotation is the positive x direction, and going CW
+			//
+			// whereas in gEDA, the gEDA origin for rotation is the negative x axis,
+			// with rotation CCW, so we need to reverse delta angle
+			//
+			// deltaAngle is CW in Kicad in deci-degrees, and CCW in degrees in gEDA
+			// NB it is in degrees in the newer s-file kicad module/footprint format
+                                pcb_fprintf(FP, "DA %.3mm %.3mm %.3mm %.3mm %.3ma %.3mm]\n",
+                                        arc->X - element->MarkX, // x_1 centre
+                                        arc->Y - element->MarkY, // y_2 centre
+                                        arc->X - element->MarkX + (arc->Thickness/2)*cos(3.141592*(arc->StartAngle+180)/360), // x_2 on circle
+					arc->Y - element->MarkY + (arc->Thickness/2)*sin(3.141592*(arc->StartAngle+180)/360), // y_2 on circle
+                                        -arc->Delta*10,   // CW delta angle in decidegrees
+                                        arc->Thickness); // stroke thickness
+                        }
+                        fputs("21\n",FP); // and now append a suitable Kicad layer, front silk = 21
 		}
-		// fputs("\n", FP); // don't need extra white space
 	}
 	return 0;
 }