70 lines
2.2 KiB
Clojure
70 lines
2.2 KiB
Clojure
(ns advent.tween)
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(defn ease-in-expo [power t start delta duration]
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(let [pct-done (/ t duration)
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pct-done (Math/pow pct-done power)]
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(+ start
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(* delta pct-done))))
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(def ease-linear (partial ease-in-expo 1.0))
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(def ease-in-quadratic (partial ease-in-expo 2.0))
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(def ease-in-cubic (partial ease-in-expo 3.0))
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(def ease-in-quartic (partial ease-in-expo 4.0))
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(def ease-in-quintic (partial ease-in-expo 5.0))
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(def ease-in-dectic (partial ease-in-expo 10.0))
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(defn ease-in-out-quadratic [t start delta duration]
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(let [t (/ t (/ duration 2))]
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(if (< t 1)
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(+ (* (/ delta 2)
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t t)
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start)
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(let [t (dec t)]
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(+ (* (/ (- delta) 2)
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(dec (* t (- t 2))))
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start)))))
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(defn ease-in-out-quintic ^double [^double t ^double start ^double delta ^double duration]
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(binding [*unchecked-math* true]
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(let [t (/ t (/ duration (double 2.0)))]
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(if (< t (double 1))
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(let [result (+ (* (/ delta (double 2.0))
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t t t t t) start)]
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result)
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(let [t (- t (double 2.0))
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result (+ (* (/ (- delta) (double 2.0))
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(- (* t t t t) (double 2.0)))
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start)]
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result
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)))))
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(defn ease-out-quadratic [t start delta duration]
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(let [t (/ t duration)]
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(+ (* (- delta) t (- t 2)) start)))
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(defn ease-out-cubic [t start delta duration]
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(let [t (dec (/ t duration))]
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(+ (* delta (inc (* t t t))) start)))
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(defn tween [id screen path start end duration & {:keys [finish ease entities]}]
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(let [ease (or ease ease-linear)
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finish (or finish identity)
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start-time (or (:total-time screen) 0.0)
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start (if (and entities (= start :current))
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(get-in entities path)
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start)
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delta (- end start)
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]
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(fn [e total-time]
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(let [delta-time (- total-time start-time)
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pct-done (min (/ delta-time duration) 1.0)
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new-val (ease delta-time start delta duration)
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e (assoc-in e path (if (= 1.0 pct-done)
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end
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new-val))]
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(if (= 1.0 pct-done)
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(finish (update-in e [:tweens] dissoc id))
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e)))))
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