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| 1 | +'use strict'; |
| 2 | + |
| 3 | +// t: current time, b: beginning value, _c: final value, d: total duration |
| 4 | +var tweenFunctions = { |
| 5 | + linear: function(t, b, _c, d) { |
| 6 | + var c = _c - b; |
| 7 | + return c * t / d + b; |
| 8 | + }, |
| 9 | + easeInQuad: function(t, b, _c, d) { |
| 10 | + var c = _c - b; |
| 11 | + return c * (t /= d) * t + b; |
| 12 | + }, |
| 13 | + easeOutQuad: function(t, b, _c, d) { |
| 14 | + var c = _c - b; |
| 15 | + return -c * (t /= d) * (t - 2) + b; |
| 16 | + }, |
| 17 | + easeInOutQuad: function(t, b, _c, d) { |
| 18 | + var c = _c - b; |
| 19 | + if ((t /= d / 2) < 1) { |
| 20 | + return c / 2 * t * t + b; |
| 21 | + } else { |
| 22 | + return -c / 2 * ((--t) * (t - 2) - 1) + b; |
| 23 | + } |
| 24 | + }, |
| 25 | + easeInCubic: function(t, b, _c, d) { |
| 26 | + var c = _c - b; |
| 27 | + return c * (t /= d) * t * t + b; |
| 28 | + }, |
| 29 | + easeOutCubic: function(t, b, _c, d) { |
| 30 | + var c = _c - b; |
| 31 | + return c * ((t = t / d - 1) * t * t + 1) + b; |
| 32 | + }, |
| 33 | + easeInOutCubic: function(t, b, _c, d) { |
| 34 | + var c = _c - b; |
| 35 | + if ((t /= d / 2) < 1) { |
| 36 | + return c / 2 * t * t * t + b; |
| 37 | + } else { |
| 38 | + return c / 2 * ((t -= 2) * t * t + 2) + b; |
| 39 | + } |
| 40 | + }, |
| 41 | + easeInQuart: function(t, b, _c, d) { |
| 42 | + var c = _c - b; |
| 43 | + return c * (t /= d) * t * t * t + b; |
| 44 | + }, |
| 45 | + easeOutQuart: function(t, b, _c, d) { |
| 46 | + var c = _c - b; |
| 47 | + return -c * ((t = t / d - 1) * t * t * t - 1) + b; |
| 48 | + }, |
| 49 | + easeInOutQuart: function(t, b, _c, d) { |
| 50 | + var c = _c - b; |
| 51 | + if ((t /= d / 2) < 1) { |
| 52 | + return c / 2 * t * t * t * t + b; |
| 53 | + } else { |
| 54 | + return -c / 2 * ((t -= 2) * t * t * t - 2) + b; |
| 55 | + } |
| 56 | + }, |
| 57 | + easeInQuint: function(t, b, _c, d) { |
| 58 | + var c = _c - b; |
| 59 | + return c * (t /= d) * t * t * t * t + b; |
| 60 | + }, |
| 61 | + easeOutQuint: function(t, b, _c, d) { |
| 62 | + var c = _c - b; |
| 63 | + return c * ((t = t / d - 1) * t * t * t * t + 1) + b; |
| 64 | + }, |
| 65 | + easeInOutQuint: function(t, b, _c, d) { |
| 66 | + var c = _c - b; |
| 67 | + if ((t /= d / 2) < 1) { |
| 68 | + return c / 2 * t * t * t * t * t + b; |
| 69 | + } else { |
| 70 | + return c / 2 * ((t -= 2) * t * t * t * t + 2) + b; |
| 71 | + } |
| 72 | + }, |
| 73 | + easeInSine: function(t, b, _c, d) { |
| 74 | + var c = _c - b; |
| 75 | + return -c * Math.cos(t / d * (Math.PI / 2)) + c + b; |
| 76 | + }, |
| 77 | + easeOutSine: function(t, b, _c, d) { |
| 78 | + var c = _c - b; |
| 79 | + return c * Math.sin(t / d * (Math.PI / 2)) + b; |
| 80 | + }, |
| 81 | + easeInOutSine: function(t, b, _c, d) { |
| 82 | + var c = _c - b; |
| 83 | + return -c / 2 * (Math.cos(Math.PI * t / d) - 1) + b; |
| 84 | + }, |
| 85 | + easeInExpo: function(t, b, _c, d) { |
| 86 | + var c = _c - b; |
| 87 | + return (t==0) ? b : c * Math.pow(2, 10 * (t/d - 1)) + b; |
| 88 | + }, |
| 89 | + easeOutExpo: function(t, b, _c, d) { |
| 90 | + var c = _c - b; |
| 91 | + return (t==d) ? b+c : c * (-Math.pow(2, -10 * t/d) + 1) + b; |
| 92 | + }, |
| 93 | + easeInOutExpo: function(t, b, _c, d) { |
| 94 | + var c = _c - b; |
| 95 | + if (t === 0) { |
| 96 | + return b; |
| 97 | + } |
| 98 | + if (t === d) { |
| 99 | + return b + c; |
| 100 | + } |
| 101 | + if ((t /= d / 2) < 1) { |
| 102 | + return c / 2 * Math.pow(2, 10 * (t - 1)) + b; |
| 103 | + } else { |
| 104 | + return c / 2 * (-Math.pow(2, -10 * --t) + 2) + b; |
| 105 | + } |
| 106 | + }, |
| 107 | + easeInCirc: function(t, b, _c, d) { |
| 108 | + var c = _c - b; |
| 109 | + return -c * (Math.sqrt(1 - (t /= d) * t) - 1) + b; |
| 110 | + }, |
| 111 | + easeOutCirc: function(t, b, _c, d) { |
| 112 | + var c = _c - b; |
| 113 | + return c * Math.sqrt(1 - (t = t / d - 1) * t) + b; |
| 114 | + }, |
| 115 | + easeInOutCirc: function(t, b, _c, d) { |
| 116 | + var c = _c - b; |
| 117 | + if ((t /= d / 2) < 1) { |
| 118 | + return -c / 2 * (Math.sqrt(1 - t * t) - 1) + b; |
| 119 | + } else { |
| 120 | + return c / 2 * (Math.sqrt(1 - (t -= 2) * t) + 1) + b; |
| 121 | + } |
| 122 | + }, |
| 123 | + easeInElastic: function(t, b, _c, d) { |
| 124 | + var c = _c - b; |
| 125 | + var a, p, s; |
| 126 | + s = 1.70158; |
| 127 | + p = 0; |
| 128 | + a = c; |
| 129 | + if (t === 0) { |
| 130 | + return b; |
| 131 | + } else if ((t /= d) === 1) { |
| 132 | + return b + c; |
| 133 | + } |
| 134 | + if (!p) { |
| 135 | + p = d * 0.3; |
| 136 | + } |
| 137 | + if (a < Math.abs(c)) { |
| 138 | + a = c; |
| 139 | + s = p / 4; |
| 140 | + } else { |
| 141 | + s = p / (2 * Math.PI) * Math.asin(c / a); |
| 142 | + } |
| 143 | + return -(a * Math.pow(2, 10 * (t -= 1)) * Math.sin((t * d - s) * (2 * Math.PI) / p)) + b; |
| 144 | + }, |
| 145 | + easeOutElastic: function(t, b, _c, d) { |
| 146 | + var c = _c - b; |
| 147 | + var a, p, s; |
| 148 | + s = 1.70158; |
| 149 | + p = 0; |
| 150 | + a = c; |
| 151 | + if (t === 0) { |
| 152 | + return b; |
| 153 | + } else if ((t /= d) === 1) { |
| 154 | + return b + c; |
| 155 | + } |
| 156 | + if (!p) { |
| 157 | + p = d * 0.3; |
| 158 | + } |
| 159 | + if (a < Math.abs(c)) { |
| 160 | + a = c; |
| 161 | + s = p / 4; |
| 162 | + } else { |
| 163 | + s = p / (2 * Math.PI) * Math.asin(c / a); |
| 164 | + } |
| 165 | + return a * Math.pow(2, -10 * t) * Math.sin((t * d - s) * (2 * Math.PI) / p) + c + b; |
| 166 | + }, |
| 167 | + easeInOutElastic: function(t, b, _c, d) { |
| 168 | + var c = _c - b; |
| 169 | + var a, p, s; |
| 170 | + s = 1.70158; |
| 171 | + p = 0; |
| 172 | + a = c; |
| 173 | + if (t === 0) { |
| 174 | + return b; |
| 175 | + } else if ((t /= d / 2) === 2) { |
| 176 | + return b + c; |
| 177 | + } |
| 178 | + if (!p) { |
| 179 | + p = d * (0.3 * 1.5); |
| 180 | + } |
| 181 | + if (a < Math.abs(c)) { |
| 182 | + a = c; |
| 183 | + s = p / 4; |
| 184 | + } else { |
| 185 | + s = p / (2 * Math.PI) * Math.asin(c / a); |
| 186 | + } |
| 187 | + if (t < 1) { |
| 188 | + return -0.5 * (a * Math.pow(2, 10 * (t -= 1)) * Math.sin((t * d - s) * (2 * Math.PI) / p)) + b; |
| 189 | + } else { |
| 190 | + return a * Math.pow(2, -10 * (t -= 1)) * Math.sin((t * d - s) * (2 * Math.PI) / p) * 0.5 + c + b; |
| 191 | + } |
| 192 | + }, |
| 193 | + easeInBack: function(t, b, _c, d, s) { |
| 194 | + var c = _c - b; |
| 195 | + if (s === void 0) { |
| 196 | + s = 1.70158; |
| 197 | + } |
| 198 | + return c * (t /= d) * t * ((s + 1) * t - s) + b; |
| 199 | + }, |
| 200 | + easeOutBack: function(t, b, _c, d, s) { |
| 201 | + var c = _c - b; |
| 202 | + if (s === void 0) { |
| 203 | + s = 1.70158; |
| 204 | + } |
| 205 | + return c * ((t = t / d - 1) * t * ((s + 1) * t + s) + 1) + b; |
| 206 | + }, |
| 207 | + easeInOutBack: function(t, b, _c, d, s) { |
| 208 | + var c = _c - b; |
| 209 | + if (s === void 0) { |
| 210 | + s = 1.70158; |
| 211 | + } |
| 212 | + if ((t /= d / 2) < 1) { |
| 213 | + return c / 2 * (t * t * (((s *= 1.525) + 1) * t - s)) + b; |
| 214 | + } else { |
| 215 | + return c / 2 * ((t -= 2) * t * (((s *= 1.525) + 1) * t + s) + 2) + b; |
| 216 | + } |
| 217 | + }, |
| 218 | + easeInBounce: function(t, b, _c, d) { |
| 219 | + var c = _c - b; |
| 220 | + var v; |
| 221 | + v = tweenFunctions.easeOutBounce(d - t, 0, c, d); |
| 222 | + return c - v + b; |
| 223 | + }, |
| 224 | + easeOutBounce: function(t, b, _c, d) { |
| 225 | + var c = _c - b; |
| 226 | + if ((t /= d) < 1 / 2.75) { |
| 227 | + return c * (7.5625 * t * t) + b; |
| 228 | + } else if (t < 2 / 2.75) { |
| 229 | + return c * (7.5625 * (t -= 1.5 / 2.75) * t + 0.75) + b; |
| 230 | + } else if (t < 2.5 / 2.75) { |
| 231 | + return c * (7.5625 * (t -= 2.25 / 2.75) * t + 0.9375) + b; |
| 232 | + } else { |
| 233 | + return c * (7.5625 * (t -= 2.625 / 2.75) * t + 0.984375) + b; |
| 234 | + } |
| 235 | + }, |
| 236 | + easeInOutBounce: function(t, b, _c, d) { |
| 237 | + var c = _c - b; |
| 238 | + var v; |
| 239 | + if (t < d / 2) { |
| 240 | + v = tweenFunctions.easeInBounce(t * 2, 0, c, d); |
| 241 | + return v * 0.5 + b; |
| 242 | + } else { |
| 243 | + v = tweenFunctions.easeOutBounce(t * 2 - d, 0, c, d); |
| 244 | + return v * 0.5 + c * 0.5 + b; |
| 245 | + } |
| 246 | + } |
| 247 | +}; |
| 248 | + |
| 249 | +module.exports = tweenFunctions; |
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