[add] menu basics and [example]

1 files changed, 32 insertions, 0 deletions

diff --git a/src/region.lisp b/src/region.lisp
index 2355db6..4f22763 100644
--- a/src/region.lisp
+++ b/src/region.lisp
@@ -4,3 +4,35 @@
 
 (defclass/std region ()
   ((left bottom top right :with :std 0)))
+
+(defmethod width ((region region))
+  (- (region-right region) (region-left region)))
+
+(defmethod (setf width) (newval (region region))
+  (with-slots (left right) region
+    (setf right (+ left newval))))
+
+(defmethod height ((region region))
+  (- (region-top region) (region-bottom region)))
+
+(defmethod (setf height) (newval (region region))
+  (with-slots (top bottom) region
+    (setf top (+ bottom newval))))
+
+(defmethod x ((r region))
+  (region-left r))
+
+(defmethod (setf x) (newval (region region))
+  (let ((width (width region))) ;;get before change
+    (with-slots (left right)
+        (setf left newval
+              right (+ newval width)))))
+
+(defmethod y ((r region))
+  (region-bottom r))
+
+(defmethod (setf y) (newval (region region))
+  (let ((height (height region))) ;;get before change
+    (with-slots (top bottom) region
+      (setf bottom newval
+            top (+ newval height)))))