;; Ripple effect - radial wave distortion from center
(require-primitives "geometry" "image" "math")

(define-effect ripple
  :params (
    (frequency :type int :default 5 :range [1 20])
    (amplitude :type int :default 10 :range [0 50])
    (center_x :type float :default 0.5 :range [0 1])
    (center_y :type float :default 0.5 :range [0 1])
    (decay :type int :default 1 :range [0 5])
    (speed :type int :default 1 :range [0 10])
  )
  (let* ((w (image:width frame))
         (h (image:height frame))
         (cx (* w center_x))
         (cy (* h center_y))
         (phase (* (or t 0) speed 2 pi))
         (coords (geometry:ripple-displace w h frequency amplitude cx cy decay phase)))
    (geometry:remap frame (geometry:coords-x coords) (geometry:coords-y coords))))