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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 | 5x 5x 5x 46x 46x 46x 46x 46x 46x 46x 46x 46x 46x 23x 46x 46x 46x 46x 46x | import { Tweenable, composeEasingObject, tweenProps } from './tweenable'
import { TweenState, Easing, TweenRawState } from './types'
// Fake a Tweenable and patch some internals. This approach enables skipping
// uneccessary processing and object recreation, cutting down on garbage
// collection pauses.
const tweenable = new Tweenable()
const { filters } = Tweenable
/**
* Compute the midpoint of two Objects. This method effectively calculates a
* specific frame of animation that {@link Tweenable#tween} does many times
* over the course of a full tween.
*
* ```
* import { interpolate } from 'shifty';
*
* const interpolatedValues = interpolate({
* width: '100px',
* opacity: 0,
* color: '#fff'
* }, {
* width: '200px',
* opacity: 1,
* color: '#000'
* },
* 0.5
* );
*
* console.log(interpolatedValues); // Logs: {opacity: 0.5, width: "150px", color: "rgb(127,127,127)"}
* ```
*/
export const interpolate = <T extends TweenState>(
/**
* The starting values to tween from.
*/
from: T,
/**
* The ending values to tween to.
*/
to: T,
/**
* The normalized position value (between `0.0` and `1.0`) to interpolate the
* values between `from` and `to` for. `from` represents `0` and `to`
* represents `1`.
*/
position: number,
/**
* The easing curve(s) to calculate the midpoint against. You can reference
* any easing function attached to {@link Tweenable.easing}, or provide the
* {@link EasingFunction}(s) directly.
*/
easing: Easing = Tweenable.easing.linear,
/**
* Optional delay to pad the beginning of the interpolated tween with. This
* increases the range of `position` from (`0` through `1`) to (`0` through
* `1 + delay`). So, a delay of `0.5` would increase all valid values of
* `position` to numbers between `0` and `1.5`.
*/
delay = 0
): T => {
const current = { ...from }
const easingObject = composeEasingObject(from, easing)
tweenable._filters.length = 0
tweenable.setState({})
tweenable._currentState = current
tweenable._originalState = from
tweenable._targetState = to
tweenable._easing = easingObject
for (const name in filters) {
if (filters[name].doesApply(tweenable)) {
tweenable._filters.push(filters[name])
}
}
// Any defined value transformation must be applied
tweenable._applyFilter('tweenCreated')
tweenable._applyFilter('beforeTween')
const interpolatedValues = tweenProps(
position,
current as TweenRawState,
from as TweenRawState,
to as TweenRawState,
1,
delay,
easingObject
)
// Transform data in interpolatedValues back into its original format
tweenable._applyFilter('afterTween')
return interpolatedValues as T
}
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