--- a/doodle/tk/geometry.d	Sat Aug 14 19:39:58 2010 +0930
+++ b/doodle/tk/geometry.d	Sat Aug 14 20:05:55 2010 +0930
@@ -152,12 +152,19 @@
         this(corner1.x, corner1.y, corner.x - corner1.x, corner.y - corner1.y);
     }
 
-    alias position minCorner;
+    double x0() { return _position.x; }
+    double y0() { return _position.y; }
+    double w()  { return _size.x; }
+    double h()  { return _size.y; }
+    double x1() { return x0 + w; }
+    double y1() { return y0 + h; }
+
+    alias position corner0;
     Point position() const { return _position; }
 
     Vector size() const { return _size; }
 
-    Point maxCorner() const { return _position + _size; }
+    Point corner1() const { return _position + _size; }
 
     bool valid() const { return _size.x > 0.0 && _size.y > 0.0; }
 
@@ -171,8 +178,8 @@
             return DEFAULT;
         }
         else {
-            Point max = minExtents(maxCorner(), r.maxCorner());
-            Point min = maxExtents(minCorner(), r.minCorner());
+            Point max = minExtents(corner1(), r.corner1());
+            Point min = maxExtents(corner0(), r.corner0());
 
             if (max.x < min.x || max.y < min.y) {
                 return DEFAULT;
@@ -192,8 +199,8 @@
             return this;
         }
         else {
-            return Rectangle(minExtents(minCorner(), r.minCorner()),
-                             maxExtents(maxCorner(), r.maxCorner()));
+            return Rectangle(minExtents(corner0(), r.corner0()),
+                             maxExtents(corner1(), r.corner1()));
         }
     }