--- a/doodle/dia/icanvas.d	Thu Aug 12 22:43:42 2010 +0930
+++ b/doodle/dia/icanvas.d	Fri Aug 13 15:28:04 2010 +0930
@@ -21,19 +21,12 @@
     // FIXME get rid of these and accumulate damage during event handling
     void damageModel(in Rectangle area);      // FIXME could be an inout parameter of the event handling, or a special scope Damage object that supports growth only
     void damagePixel(in Rectangle area);      // FIXME as above
+}
 
-    /*
-    // FIXME hoping we won't need anything like this
-    double zoom() const;
-    Point modelToPixel(in Point model) const;
-    Point pixelToModel(in Point pixel) const;
-    Vector modelToPixel(in Vector model) const;
-    Vector pixelToModel(in Vector pixel) const;
-    Rectangle modelToPixel(in Rectangle model) const;
-    Rectangle pixelToModel(in Rectangle model) const;
-    double modelToPixel(in double model) const;
-    double pixelToModel(in double pixel) const;
-     */
+final class Damage {
+    void increase(in Rectangle additional) { _rectangle = _rectangle | additional; }
+    Rectangle rectangle() const { return _rectangle; }
+    private Rectangle _rectangle;
 }
 
 interface IEventHandler {