20 lines
779 B
Common Lisp
20 lines
779 B
Common Lisp
;; Ripple effect - radial wave distortion from center
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(require-primitives "geometry" "image" "math")
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(define-effect ripple
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:params (
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(frequency :type int :default 5 :range [1 20])
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(amplitude :type int :default 10 :range [0 50])
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(center_x :type float :default 0.5 :range [0 1])
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(center_y :type float :default 0.5 :range [0 1])
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(decay :type int :default 1 :range [0 5])
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(speed :type int :default 1 :range [0 10])
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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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(cx (* w center_x))
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(cy (* h center_y))
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(phase (* (or t 0) speed 2 pi))
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(coords (geometry:ripple-displace w h frequency amplitude cx cy decay phase)))
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(geometry:remap frame (geometry:coords-x coords) (geometry:coords-y coords))))
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