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(defun gr ()
(show-graphics)
(showpen)
(moveto 0 0)
(lineto 20 20))
(setf graph-width 600)
(setf graph-height 220)
(defun array-max-abs (points)
(let ((m 0.0))
(dotimes (i (length points))
(setf m (max m (abs (aref points i)))))
m))
(defun s-plot (snd &optional (n 1000))
(prog ((points (snd-samples snd n))
maxpoint y-offset horizontal-scale vertical-scale)
(show-graphics)
(clear-graphics)
(setf maxpoint (array-max-abs points))
(setf y-offset (/ graph-height 2))
(moveto 0 y-offset)
(lineto graph-width y-offset)
(moveto 0 y-offset)
(setf horizontal-scale (/ (float graph-width) (length points)))
(setf vertical-scale (- (/ (float y-offset) maxpoint)))
(dotimes (i (length points))
(lineto (truncate (* horizontal-scale i))
(+ y-offset (truncate (* vertical-scale (aref points i))))))
(format t "X Axis: ~A to ~A (seconds)\n" (snd-t0 snd) (/ (length points) (snd-srate snd)))
(format t "Y Axis: ~A to ~A\n" (- maxpoint) maxpoint)
(format t "~A samples plotted.\n" (length points))
))
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