740a9723b84d

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/ascii.lisp	Sat Jul 16 22:04:38 2016 +0000
@@ -0,0 +1,55 @@
+(in-package #:sand.ascii)
+
+
+(defparameter *running* nil)
+(defparameter *running* t)
+
+(defparameter *ball* (list :x 0 :y 20 :vx 1))
+(defparameter *width* 1)
+(defparameter *height* 1)
+
+(defun render ()
+  (charms:move-cursor charms:*standard-window*
+                      (getf *ball* :x)
+                      (getf *ball* :y))
+  (charms:write-char-at-cursor charms:*standard-window* #\o)
+  (charms:move-cursor charms:*standard-window* 0 0))
+
+
+(defun tick ()
+  (incf (getf *ball* :x)
+        (getf *ball* :vx))
+  (when (not (< 0 (getf *ball* :x) (1- *width*)))
+    (zap% (getf *ball* :vx) #'- %))
+  (setf (getf *ball* :y) (truncate (/ *height* 2))))
+
+(defun handle-input ()
+  (let ((input (charms:get-char charms:*standard-window* :ignore-error t)))
+    (case input
+      ((nil) nil)
+      (#\q (setf *running* nil)))))
+
+(defun manage-screen ()
+  (multiple-value-bind (w h)
+      (charms:window-dimensions charms:*standard-window*)
+    (setf *width* w *height* h)))
+
+(defun run ()
+  (setf *running* t)
+  (charms:with-curses ()
+    (charms:disable-echoing)
+    (charms:enable-raw-input :interpret-control-characters t)
+    (charms:enable-non-blocking-mode charms:*standard-window*)
+
+    (iterate
+      (while *running*)
+      (charms:clear-window charms:*standard-window*)
+      (manage-screen)
+      (handle-input)
+      (tick)
+      (render)
+      (charms:refresh-window charms:*standard-window*)
+      (sleep 0.03))))
+
+
+; (run)