18 lines
665 B
Common Lisp
18 lines
665 B
Common Lisp
;; Swirl effect - spiral vortex distortion
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(require-primitives "geometry" "image")
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(define-effect swirl
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:params (
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(strength :type int :default 1 :range [-10 10])
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(radius :type float :default 0.5 :range [0.1 2])
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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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(falloff :type string :default "quadratic")
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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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(coords (geometry:swirl-coords w h strength radius cx cy falloff)))
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(geometry:remap frame (geometry:coords-x coords) (geometry:coords-y coords))))
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