Index: src/java/org/apache/fop/area/CTM.java
===================================================================
--- src/java/org/apache/fop/area/CTM.java	(revision 240357)
+++ src/java/org/apache/fop/area/CTM.java	(working copy)
@@ -157,13 +157,13 @@
      */
     public CTM rotate(double angle) {
         double cos, sin;
-        if (angle == 90.0) {
+        if (angle == 90.0 || angle == -270.0) {
             cos = 0.0;
             sin = 1.0;
-        } else if (angle == 270.0) {
+        } else if (angle == 270.0 || angle == -90.0) {
             cos = 0.0;
             sin = -1.0;
-        } else if (angle == 180.0) {
+        } else if (angle == 180.0 || angle == -180.0) {
             cos = -1.0;
             sin = 0.0;
         } else {
@@ -283,12 +283,15 @@
             // first quadrant. Note: rotation is counter-clockwise
             switch (absRefOrient) {
                 case 90:
+                case -270:
                     ctm = ctm.translate(0, width); // width = absVPrect.height
                     break;
                 case 180:
+                case -180:
                     ctm = ctm.translate(width, height);
                     break;
                 case 270:
+                case -90:
                     ctm = ctm.translate(height, 0); // height = absVPrect.width
                     break;
             }