( input: number, inputMin: number, inputMax: number, outputMin: number, outputMax: number, easing: EasingFunction, extrapolateLeft: ExtrapolateType, extrapolateRight: ExtrapolateType, map?: (x: number) => number )
| 57 | } |
| 58 | |
| 59 | function interpolate( |
| 60 | input: number, |
| 61 | inputMin: number, |
| 62 | inputMax: number, |
| 63 | outputMin: number, |
| 64 | outputMax: number, |
| 65 | easing: EasingFunction, |
| 66 | extrapolateLeft: ExtrapolateType, |
| 67 | extrapolateRight: ExtrapolateType, |
| 68 | map?: (x: number) => number |
| 69 | ) { |
| 70 | let result = map ? map(input) : input |
| 71 | // Extrapolate |
| 72 | if (result < inputMin) { |
| 73 | if (extrapolateLeft === 'identity') return result |
| 74 | else if (extrapolateLeft === 'clamp') result = inputMin |
| 75 | } |
| 76 | if (result > inputMax) { |
| 77 | if (extrapolateRight === 'identity') return result |
| 78 | else if (extrapolateRight === 'clamp') result = inputMax |
| 79 | } |
| 80 | if (outputMin === outputMax) return outputMin |
| 81 | if (inputMin === inputMax) return input <= inputMin ? outputMin : outputMax |
| 82 | // Input Range |
| 83 | if (inputMin === -Infinity) result = -result |
| 84 | else if (inputMax === Infinity) result = result - inputMin |
| 85 | else result = (result - inputMin) / (inputMax - inputMin) |
| 86 | // Easing |
| 87 | result = easing(result) |
| 88 | // Output Range |
| 89 | if (outputMin === -Infinity) result = -result |
| 90 | else if (outputMax === Infinity) result = result + outputMin |
| 91 | else result = result * (outputMax - outputMin) + outputMin |
| 92 | return result |
| 93 | } |
| 94 | |
| 95 | function findRange(input: number, inputRange: readonly number[]) { |
| 96 | // eslint-disable-next-line no-var |
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