41 lines
719 B
Common Lisp
41 lines
719 B
Common Lisp
; this demo shows how to use the animate event to animate lines into a sine wave.
|
|
;
|
|
(def seg-count 50)
|
|
;
|
|
(def seg-width
|
|
(div frame:w seg-count))
|
|
;
|
|
(defn elevation
|
|
(i)
|
|
(add
|
|
(mul
|
|
(sin
|
|
(add
|
|
(time 0.001)
|
|
(div i 5)))
|
|
(div frame:h 5)) frame:m))
|
|
;
|
|
(defn draw-dash
|
|
(i)
|
|
(
|
|
(def x
|
|
(mul
|
|
(sub i 1) seg-width))
|
|
(def y
|
|
(elevation i))
|
|
(stroke
|
|
(line x
|
|
(elevation
|
|
(sub i 1))
|
|
(add x seg-width)
|
|
(elevation i))
|
|
(gradient
|
|
(line 50 0 frame:w 0)
|
|
("#ffb545" "#72dec2")) 4 )))
|
|
;
|
|
(defn redraw
|
|
()
|
|
(
|
|
(clear)
|
|
(times seg-count draw-dash)))
|
|
(on "animate" redraw) |