[modify] affine fns are generic; [add] safe-slot util

2 files changed, 13 insertions, 7 deletions

diff --git a/src/core/affine.lisp b/src/core/affine.lisp
index cabe17c..4585a81 100644
--- a/src/core/affine.lisp
+++ b/src/core/affine.lisp
@@ -15,7 +15,9 @@
      (setf (cached-model affine) nil
            (cached-projected-matrix affine) nil))))
 
-(defun scale-by (affine amount)
+
+
+(defmethod scale-by ((affine affine) amount)
   (with-slots (scale-x scale-y) affine
     (setf scale-x (* amount scale-x)
           scale-y (* amount scale-y))))
@@ -26,19 +28,19 @@
 (defun set-height-preserve-aspect (affine new-height)
   (scale-by affine (/ new-height (height affine) )))
 
-(defun width (affine)
+(defmethod width ((affine affine))
   (with-slots (scale-x base-width) affine
     (* scale-x base-width)))
 
-(defun height (affine)
+(defmethod height ((affine affine))
   (with-slots (scale-y base-height) affine
     (* scale-y base-height)))
 
-(defun (setf width) (newval affine)
+(defmethod (setf width) (newval (affine affine))
   (with-slots (scale-x base-width) affine
     (setf scale-x (coerce (/ newval base-width) 'single-float))))
 
-(defun (setf height) (newval affine)
+(defmethod (setf height) (newval (affine affine))
   (with-slots (scale-y base-height) affine
     (setf scale-y (coerce (/ newval base-height) 'single-float))))
 
diff --git a/src/core/unit.lisp b/src/core/unit.lisp
index 20e05e2..fb02f08 100644
--- a/src/core/unit.lisp
+++ b/src/core/unit.lisp
@@ -3,8 +3,9 @@
 (in-package #:wheelwork)
 
 (defclass/std unit ()
-  ((cached-application  :a)
-   (container :with :a)))
+  ((cached-application :a)
+   (container :with :a)
+   (visiblep :with :std t)))
 
 (defmethod (setf closer-mop:slot-value-using-class) :after
     (newval class (unit unit) slot)
@@ -28,3 +29,6 @@ in this application."
               (rec unit)))))
 
 
+(defmethod render :around ((unit unit))
+  (when (unit-visiblep unit)
+    (call-next-method)))