diff --git a/easingpackage.js b/easingpackage.js new file mode 100644 index 0000000..1767662 --- /dev/null +++ b/easingpackage.js @@ -0,0 +1,114 @@ +export var easings = { // Easings taken from https://easings.net/ + linear: (x) => { + return x; + }, + easeInSine: (x) => { + return 1 - Math.cos((x * Math.PI) / 2); + }, + easeOutSine: (x) => { + return Math.sin((x * Math.PI) / 2); + }, + easeInOutSine: (x) => { + return -(Math.cos(Math.PI * x) - 1) / 2; + }, + easeInQuad: (x) => { + return x * x; + }, + easeOutQuad: (x) => { + return 1 - (1 - x) * (1 - x); + }, + easeInOutQuad: (x) => { + return x < 0.5 ? 2 * x * x : 1 - Math.pow(-2 * x + 2, 2) / 2; + }, + easeInCubic: (x) => { + return x * x * x; + }, + easeOutCubic: (x) => { + return 1 - Math.pow(1 - x, 3); + }, + easeInOutCubic: (x) => { + return x < 0.5 ? 4 * x * x * x : 1 - Math.pow(-2 * x + 2, 3) / 2; + }, + easeInQuart: (x) => { + return x * x * x * x; + }, + easeOutQuart: (x) => { + return 1 - Math.pow(1 - x, 4); + }, + easeInOutQuart: (x) => { + return x < 0.5 ? 8 * x * x * x * x : 1 - Math.pow(-2 * x + 2, 4) / 2; + }, + easeInQuint: (x) => { + return x * x * x * x * x; + }, + easeOutQuint: (x) => { + return 1 - Math.pow(1 - x, 5); + }, + easeInOutQuint: (x) => { + return x < 0.5 ? 16 * x * x * x * x * x : 1 - Math.pow(-2 * x + 2, 5) / 2; + }, + easeInExpo: (x) => { + return x === 0 ? 0 : Math.pow(2, 10 * x - 10); + }, + easeOutExpo: (x) => { + return x === 1 ? 1 : 1 - Math.pow(2, -10 * x); + }, + easeInOutExpo: (x) => { + return x === 0 + ? 0 + : x === 1 + ? 1 + : x < 0.5 ? Math.pow(2, 20 * x - 10) / 2 + : (2 - Math.pow(2, -20 * x + 10)) / 2; + }, + easeInCirc: (x) => { + return 1 - Math.sqrt(1 - Math.pow(x, 2)); + }, + easeOutCirc: (x) => { + return Math.sqrt(1 - Math.pow(x - 1, 2)); + }, + easeInOutCirc: (x) => { + return x < 0.5 + ? (1 - Math.sqrt(1 - Math.pow(2 * x, 2))) / 2 + : (Math.sqrt(1 - Math.pow(-2 * x + 2, 2)) + 1) / 2; + }, + easeInBack: (x) => { + const c1 = 1.70158; + const c3 = c1 + 1; + return c3 * x * x * x - c1 * x * x; + }, + easeOutBack: (x) => { + const c1 = 1.70158; + const c3 = c1 + 1; + return 1 + c3 * Math.pow(x - 1, 3) + c1 * Math.pow(x - 1, 2); + }, + easeInOutBack: (x) => { + const c1 = 1.70158; + const c2 = c1 * 1.525; + return x < 0.5 + ? (Math.pow(2 * x, 2) * ((c2 + 1) * 2 * x - c2)) / 2 + : (Math.pow(2 * x - 2, 2) * ((c2 + 1) * (x * 2 - 2) + c2) + 2) / 2; + }, + easeInBounce: (x) => { + return 1 - easings.easeOutBounce(1 - x); + }, + easeOutBounce: (x) => { + const n1 = 7.5625; + const d1 = 2.75; + + if (x < 1 / d1) { + return n1 * x * x; + } else if (x < 2 / d1) { + return n1 * (x -= 1.5 / d1) * x + 0.75; + } else if (x < 2.5 / d1) { + return n1 * (x -= 2.25 / d1) * x + 0.9375; + } else { + return n1 * (x -= 2.625 / d1) * x + 0.984375; + } + }, + easeInOutBounce: (x) => { + return x < 0.5 + ? (1 - easings.easeOutBounce(1 - 2 * x)) / 2 + : (1 + easings.easeOutBounce(2 * x - 1)) / 2; + } +};