6 lines
163 B
JavaScript
6 lines
163 B
JavaScript
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function circInOut(t) {
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if ((t *= 2) < 1) return -0.5 * (Math.sqrt(1 - t * t) - 1)
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return 0.5 * (Math.sqrt(1 - (t -= 2) * t) + 1)
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}
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module.exports = circInOut
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