PDFBOX-5660: use quadrantrotate

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1927763 13f79535-47bb-0310-9956-ffa450edef68

Author: THausherr

pdfbox/src/main/java/org/apache/pdfbox/multipdf/LayerUtility.java

@@ -196,16 +196,16 @@ public PDFormXObject importPageAsForm(PDDocument sourceDoc, PDPage page) throws
         case 90:
             at.scale(viewBox.getWidth() / viewBox.getHeight(), viewBox.getHeight() / viewBox.getWidth());
             at.translate(0, viewBox.getWidth());
-            at.rotate(-Math.PI / 2.0);
+            at.quadrantRotate(3); // 270
             break;
         case 180:
             at.translate(viewBox.getWidth(), viewBox.getHeight());
-            at.rotate(-Math.PI);
+            at.quadrantRotate(2); // 180
             break;
         case 270:
             at.scale(viewBox.getWidth() / viewBox.getHeight(), viewBox.getHeight() / viewBox.getWidth());
             at.translate(viewBox.getHeight(), 0);
-            at.rotate(-Math.PI * 1.5);
+            at.quadrantRotate(1); // 90
             break;
         default:
             //no additional transformations necessary