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Diffstat (limited to 'src/canvas-language.lisp')
| -rw-r--r-- | src/canvas-language.lisp | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/src/canvas-language.lisp b/src/canvas-language.lisp index b77ad02..6583fc8 100644 --- a/src/canvas-language.lisp +++ b/src/canvas-language.lisp @@ -27,10 +27,11 @@ (defun canvas-pen-color (r g b a) (setf *current-pen-color* (mapcar #'colfix (list r g b a)))) -(defun canvas-pen-color-function (fn) +(defun canvas-pen-color-function (&optional fn) (setf *current-pen-color-function* - (lambda (x y) - (mapcar #'colfix (funcall fn x y))))) + (when fn + (lambda (x y) + (mapcar #'colfix (funcall fn x y)))))) (defun canvas-pen-width (n) (setf *current-pen-width* (round n))) |