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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,128 @@ | ||
| public enum Easing { | ||
| case inSine | ||
| case outSine | ||
| case inOutSine | ||
| case inQuad | ||
| case outQuad | ||
| case inOutQuad | ||
| case inCubic | ||
| case outCubic | ||
| case inOutCubic | ||
| case inQuart | ||
| case outQuart | ||
| case inOutQuart | ||
| case inQuint | ||
| case outQuint | ||
| case inOutQuint | ||
| case inExpo | ||
| case outExpo | ||
| case inOutExpo | ||
| case inCirc | ||
| case outCirc | ||
| case inOutCirc | ||
| case inBack | ||
| case outBack | ||
| case inOutBack | ||
| case inElastic | ||
| case outElastic | ||
| case inOutElastic | ||
| case inBounce | ||
| case outBounce | ||
| case inOutBounce | ||
|
|
||
| // MARK: Public | ||
|
|
||
| public func ease(_ value: Float, duration: Float = 1, scale: ClosedRange<Float> = 0...1) -> Float { | ||
| var x = value.scaled(from: 0...duration, to: 0...1) | ||
| .clamped(to: 0...1) | ||
| let ease = { | ||
| switch self { | ||
| case .inSine: | ||
| return 1 - cosf((x * Float.pi) / 2) | ||
| case .outSine: | ||
| return sinf((x * Float.pi) / 2) | ||
| case .inOutSine: | ||
| return -(cosf(Float.pi * x) - 1) / 2 | ||
| case .inQuad: | ||
| return x * x | ||
| case .outQuad: | ||
| return 1 - (1 - x) * (1 - x) | ||
| case .inOutQuad: | ||
| return x < 0.5 ? 2 * x * x : 1 - powf(-2 * x + 2, 2) / 2 | ||
| case .inCubic: | ||
| return x * x * x | ||
| case .outCubic: | ||
| return 1 - powf(1 - x, 3) | ||
| case .inOutCubic: | ||
| return x < 0.5 ? 4 * x * x * x : 1 - powf(-2 * x + 2, 3) / 2 | ||
| case .inQuart: | ||
| return x * x * x * x | ||
| case .outQuart: | ||
| return 1 - powf(1 - x, 4) | ||
| case .inOutQuart: | ||
| return x < 0.5 ? 8 * x * x * x * x : 1 - powf(-2 * x + 2, 4) / 2 | ||
| case .inQuint: | ||
| return x * x * x * x * x | ||
| case .outQuint: | ||
| return 1 - powf(1 - x, 5) | ||
| case .inOutQuint: | ||
| return x < 0.5 ? 16 * x * x * x * x * x : 1 - powf(-2 * x + 2, 5) / 2 | ||
| case .inExpo: | ||
| return x == 0 ? 0 : powf(2, 10 * x - 10) | ||
| case .outExpo: | ||
| return x == 1 ? 1 : 1 - powf(2, -10 * x) | ||
| case .inOutExpo: | ||
| return x == 0 ? 0 : x == 1 ? 1 : x < 0.5 ? powf(2, 20 * x - 10) / 2 : 2 - powf(2, -20 * x + 10) / 2 | ||
| case .inCirc: | ||
| return 1 - sqrtf(1 - powf(x, 2)) | ||
| case .outCirc: | ||
| return sqrtf(1 - powf(x - 1, 2)) | ||
| case .inOutCirc: | ||
| return x < 0.5 ? (1 - sqrtf(1 - powf(2 * x, 2))) / 2 : (sqrtf(1 - powf(-2 * x + 2, 2)) + 1) / 2 | ||
| case .inBack: | ||
| let c1: Float = 1.70158 | ||
| let c3: Float = c1 + 1 | ||
| return c3 * x * x * x - c1 * x * x | ||
| case .outBack: | ||
| let c1: Float = 1.70158 | ||
| let c3: Float = c1 + 1 | ||
| return 1 + c3 * powf(x - 1, 3) + c1 * powf(x - 1, 2) | ||
| case .inOutBack: | ||
| let c1: Float = 1.70158 | ||
| let c2: Float = c1 * 1.525 | ||
| return x < 0.5 ? (powf(2 * x, 2) * ((c2 + 1) * 2 * x - c2)) / 2 : (powf(2 * x - 2, 2) * ((c2 + 1) * (x * 2 - 2) + c2) + 2) / 2 | ||
| case .inElastic: | ||
| let c4: Float = (2 * Float.pi) / 3 | ||
| return x == 0 ? 0 : x == 1 ? 1 : -powf(2, 10 * x - 10) * sinf((x * 10 - 10.75) * c4) | ||
| case .outElastic: | ||
| let c4: Float = (2 * Float.pi) / 3 | ||
| return x == 0 ? 0 : x == 1 ? 1 : powf(2, -10 * x) * sinf((x * 10 - 0.75) * c4) + 1 | ||
| case .inOutElastic: | ||
| let c5: Float = (2 * Float.pi) / 4.5 | ||
| return x == 0 ? 0 : x == 1 ? 1 : x < 0.5 ? -(powf(2, 20 * x - 10) * sinf((20 * x - 11.125) * c5)) / 2 : (powf(2, -20 * x + 10) * sinf((20 * x - 11.125) * c5)) / 2 + 1 | ||
| case .inBounce: | ||
| return 1 - Easing.outBounce.ease(1 - x) | ||
| case .outBounce: | ||
| let n1: Float = 7.5625 | ||
| let d1: Float = 2.75 | ||
|
|
||
| if x < 1 / d1 { | ||
| return n1 * x * x | ||
| } else if x < 2 / d1 { | ||
| x -= 1.5 / d1 | ||
| return n1 * x * x + 0.75 | ||
| } else if x < 2.5 / d1 { | ||
| x -= 2.25 / d1 | ||
| return n1 * x * x + 0.9375 | ||
| } else { | ||
| x -= 2.625 / d1 | ||
| return n1 * x * x + 0.984375 | ||
| } | ||
| case .inOutBounce: | ||
| return x < 0.5 ? (1 - Easing.outBounce.ease(1 - 2 * x)) / 2 : (1 + Easing.outBounce.ease(2 * x - 1)) / 2 | ||
| } | ||
| }() | ||
|
|
||
| return ease.scaled(from: 0...1, to: scale) | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,12 @@ | ||
| public extension Comparable { | ||
| func clamped(to range: ClosedRange<Self>) -> Self { | ||
| max(min(self, range.upperBound), range.lowerBound) | ||
| } | ||
| } | ||
|
|
||
| public extension Comparable where Self: FloatingPoint { | ||
| func scaled(from inputRange: ClosedRange<Self>, to outputRange: ClosedRange<Self>) -> Self { | ||
| (self - inputRange.lowerBound) * (outputRange.upperBound - outputRange.lowerBound) / | ||
| (inputRange.upperBound - inputRange.lowerBound) + outputRange.lowerBound | ||
| } | ||
| } |