PageState: add a method for performing a CTM transform

yob · Feb 18, 2012 · cf8f730 · cf8f730
1 parent fd25ba0
commit cf8f730
Showing 1 changed file with 10 additions and 0 deletions.
diff --git a/lib/pdf/reader/page_state.rb b/lib/pdf/reader/page_state.rb
@@ -195,6 +195,16 @@ def invoke_xobject(label)
       # Public Visible State
       #####################################################
 
+      # transform x and y co-ordinates from the current user space to the
+      # underlying device space.
+      #
+      def ctm_transform(x, y, z = 1)
+        [
+          (ctm[0,0] * x) + (ctm[1,0] * y) + (ctm[2,0] * z),
+          (ctm[0,1] * x) + (ctm[1,1] * y) + (ctm[2,1] * z)
+        ]
+      end
+
       # transform x and y co-ordinates from the current text space to the
       # underlying device space.
       #