23 lines
913 B
Common Lisp
23 lines
913 B
Common Lisp
;; Wave effect - sine wave displacement distortion
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(require-primitives "geometry" "image")
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(define-effect wave
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:params (
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(amplitude :type int :default 10 :range [0 100])
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(wavelength :type int :default 50 :range [10 500])
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(speed :type int :default 1 :range [0 10])
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(direction :type string :default "horizontal")
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)
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(let* ((w (image:width frame))
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(h (image:height frame))
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;; Use _time for animation phase
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(phase (* (or _time 0) speed 2 pi))
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;; Calculate frequency: waves per dimension
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(freq (/ (if (= direction "vertical") w h) wavelength))
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(axis (cond
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((= direction "horizontal") "x")
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((= direction "vertical") "y")
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(else "both")))
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(coords (geometry:wave-coords w h axis freq amplitude phase)))
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(geometry:remap frame (geometry:coords-x coords) (geometry:coords-y coords))))
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