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44 lines
1.2 KiB
Swift
44 lines
1.2 KiB
Swift
//
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// KeyframeExtensions.swift
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// lottie-swift
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//
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// Created by Brandon Withrow on 1/14/19.
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//
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import Foundation
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import CoreGraphics
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extension Keyframe {
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/// Interpolates the keyTime into a value from 0-1
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func interpolatedProgress(_ to: Keyframe, keyTime: CGFloat) -> CGFloat {
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let startTime = time
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let endTime = to.time
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if keyTime <= startTime {
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return 0
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}
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if endTime <= keyTime {
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return 1
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}
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if isHold {
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return 0
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}
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let outTanPoint = outTangent?.pointValue ?? .zero
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let inTanPoint = to.inTangent?.pointValue ?? CGPoint(x: 1, y: 1)
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var progress: CGFloat = keyTime.remap(fromLow: startTime, fromHigh: endTime, toLow: 0, toHigh: 1)
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if !outTanPoint.isZero || !inTanPoint.equalTo(CGPoint(x: 1, y: 1)) {
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/// Cubic interpolation
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progress = progress.cubicBezierInterpolate(.zero, outTanPoint, inTanPoint, CGPoint(x: 1, y: 1))
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}
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return progress
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}
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/// Interpolates the keyframes' by a progress from 0-1
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func interpolate(_ to: Keyframe, progress: CGFloat) -> T {
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return value.interpolateTo(to.value, amount: progress, spatialOutTangent: spatialOutTangent?.pointValue, spatialInTangent: to.spatialInTangent?.pointValue)
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}
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}
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