feat(shape): Add dictionary of all easing functions

Author: ghaiklor

src/easing.js

@@ -0,0 +1,158 @@
+/**
+ * Dictionary of all available easing.
+ */
+export const EASING = {
+  inQuad: (t, b, c, d) => c * (t /= d) * t + b,
+
+  outQuad: (t, b, c, d) => -c * (t /= d) * (t - 2) + b,
+
+  inOutQuad: (t, b, c, d) => {
+    if ((t /= d / 2) < 1) return c / 2 * t * t + b;
+    return -c / 2 * ((--t) * (t - 2) - 1) + b;
+  },
+
+  inCubic: (t, b, c, d) => c * (t /= d) * t * t + b,
+
+  outCubic: (t, b, c, d) => c * ((t = t / d - 1) * t * t + 1) + b,
+
+  inOutCubic: (t, b, c, d) => {
+    if ((t /= d / 2) < 1) return c / 2 * t * t * t + b;
+    return c / 2 * ((t -= 2) * t * t + 2) + b;
+  },
+
+  inQuart: (t, b, c, d) => c * (t /= d) * t * t * t + b,
+
+  outQuart: (t, b, c, d) => -c * ((t = t / d - 1) * t * t * t - 1) + b,
+
+  inOutQuart: (t, b, c, d) => {
+    if ((t /= d / 2) < 1) return c / 2 * t * t * t * t + b;
+    return -c / 2 * ((t -= 2) * t * t * t - 2) + b;
+  },
+
+  inQuint: (t, b, c, d) => c * (t /= d) * t * t * t * t + b,
+
+  outQuint: (t, b, c, d) => c * ((t = t / d - 1) * t * t * t * t + 1) + b,
+
+  inOutQuint: (t, b, c, d) => {
+    if ((t /= d / 2) < 1) return c / 2 * t * t * t * t * t + b;
+    return c / 2 * ((t -= 2) * t * t * t * t + 2) + b;
+  },
+
+  inSine: (t, b, c, d) => -c * Math.cos(t / d * (Math.PI / 2)) + c + b,
+
+  outSine: (t, b, c, d) => c * Math.sin(t / d * (Math.PI / 2)) + b,
+
+  inOutSine: (t, b, c, d) => -c / 2 * (Math.cos(Math.PI * t / d) - 1) + b,
+
+  inExpo: (t, b, c, d) => (t == 0) ? b : c * Math.pow(2, 10 * (t / d - 1)) + b,
+
+  outExpo: (t, b, c, d) => (t == d) ? b + c : c * (-Math.pow(2, -10 * t / d) + 1) + b,
+
+  inOutExpo: (t, b, c, d) => {
+    if (t == 0) return b;
+    if (t == d) return b + c;
+    if ((t /= d / 2) < 1) return c / 2 * Math.pow(2, 10 * (t - 1)) + b;
+    return c / 2 * (-Math.pow(2, -10 * --t) + 2) + b;
+  },
+
+  inCirc: (t, b, c, d) => -c * (Math.sqrt(1 - (t /= d) * t) - 1) + b,
+
+  outCirc: (t, b, c, d) => c * Math.sqrt(1 - (t = t / d - 1) * t) + b,
+
+  inOutCirc: (t, b, c, d) => {
+    if ((t /= d / 2) < 1) return -c / 2 * (Math.sqrt(1 - t * t) - 1) + b;
+    return c / 2 * (Math.sqrt(1 - (t -= 2) * t) + 1) + b;
+  },
+
+  inElastic: (t, b, c, d) => {
+    let s = 1.70158;
+    let p = 0;
+    let a = c;
+
+    if (t == 0) return b;
+    if ((t /= d) == 1) return b + c;
+    if (!p) p = d * .3;
+    if (a < Math.abs(c)) {
+      a = c;
+      s = p / 4;
+    } else {
+      s = p / (2 * Math.PI) * Math.asin(c / a)
+    }
+
+    return -(a * Math.pow(2, 10 * (t -= 1)) * Math.sin((t * d - s) * (2 * Math.PI) / p)) + b;
+  },
+
+  outElastic: (t, b, c, d) => {
+    let s = 1.70158;
+    let p = 0;
+    let a = c;
+
+    if (t == 0) return b;
+    if ((t /= d) == 1) return b + c;
+    if (!p) p = d * .3;
+
+    if (a < Math.abs(c)) {
+      a = c;
+      s = p / 4;
+    } else {
+      s = p / (2 * Math.PI) * Math.asin(c / a)
+    }
+
+    return a * Math.pow(2, -10 * t) * Math.sin((t * d - s) * (2 * Math.PI) / p) + c + b;
+  },
+
+  inOutElastic: (t, b, c, d) => {
+    let s = 1.70158;
+    let p = 0;
+    let a = c;
+
+    if (t == 0) return b;
+    if ((t /= d / 2) == 2) return b + c;
+    if (!p) p = d * (.3 * 1.5);
+    if (a < Math.abs(c)) {
+      a = c;
+      s = p / 4;
+    } else {
+      s = p / (2 * Math.PI) * Math.asin(c / a)
+    }
+
+    if (t < 1) return -.5 * (a * Math.pow(2, 10 * (t -= 1)) * Math.sin((t * d - s) * (2 * Math.PI) / p)) + b;
+    return a * Math.pow(2, -10 * (t -= 1)) * Math.sin((t * d - s) * (2 * Math.PI) / p) * .5 + c + b;
+  },
+
+  inBack: (t, b, c, d) => {
+    let s = 1.70158;
+    return c * (t /= d) * t * ((s + 1) * t - s) + b;
+  },
+
+  outBack: (t, b, c, d) => {
+    let s = 1.70158;
+    return c * ((t = t / d - 1) * t * ((s + 1) * t + s) + 1) + b;
+  },
+
+  inOutBack: (t, b, c, d) => {
+    let s = 1.70158;
+
+    if ((t /= d / 2) < 1) return c / 2 * (t * t * (((s *= (1.525)) + 1) * t - s)) + b;
+    return c / 2 * ((t -= 2) * t * (((s *= (1.525)) + 1) * t + s) + 2) + b;
+  },
+
+  inBounce: (t, b, c, d) => c - this.OutBounce(x, d - t, 0, c, d) + b,
+
+  outBounce: (t, b, c, d) => {
+    if ((t /= d) < (1 / 2.75)) {
+      return c * (7.5625 * t * t) + b;
+    } else if (t < (2 / 2.75)) {
+      return c * (7.5625 * (t -= (1.5 / 2.75)) * t + .75) + b;
+    } else if (t < (2.5 / 2.75)) {
+      return c * (7.5625 * (t -= (2.25 / 2.75)) * t + .9375) + b;
+    } else {
+      return c * (7.5625 * (t -= (2.625 / 2.75)) * t + .984375) + b;
+    }
+  },
+
+  inOutBounce: (t, b, c, d) => {
+    if (t < d / 2) return this.inBounce(x, t * 2, 0, c, d) * .5 + b;
+    return this.outBounce(x, t * 2 - d, 0, c, d) * .5 + c * .5 + b;
+  }
+};