Index: trunk/Ohana/src/kapa2/src/bDrawOverlay.c
===================================================================
--- trunk/Ohana/src/kapa2/src/bDrawOverlay.c	(revision 40558)
+++ trunk/Ohana/src/kapa2/src/bDrawOverlay.c	(revision 41157)
@@ -24,8 +24,13 @@
   }
 
-  Xmin = 0;
-  Ymin = 0;
-  Xmax = image[0].picture.dx;
-  Ymax = image[0].picture.dy;
+  // Xmin = 0;
+  // Ymin = 0;
+  // Xmax = image[0].picture.dx;
+  // Ymax = image[0].picture.dy;
+
+  Xmin = image[0].picture.x;
+  Ymin = image[0].picture.y;
+  Xmax = image[0].picture.x + image[0].picture.dx; // maybe this should be just dx?
+  Ymax = image[0].picture.y + image[0].picture.dy;
 
   if (N == INFRONT) {
@@ -35,5 +40,7 @@
 
   for (i = 0; i < image[0].overlay[N].Nobjects; i++) {
-    Image_to_Picture (&X, &Y, image[0].overlay[N].objects[i].x, image[0].overlay[N].objects[i].y, &image[0].picture);
+    // XXX the 0.5,0.5 offset is apparently needed here.
+    // work on rationalizing these functions in the context of their different plotting types
+    Image_to_Screen (&X, &Y, image[0].overlay[N].objects[i].x - 0.5, image[0].overlay[N].objects[i].y - 0.5, &image[0].picture);
     dX = image[0].overlay[N].objects[i].dx * expand;
     dY = image[0].overlay[N].objects[i].dy * expand;