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add a mapping ability to the interpolate method #7699

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rocman wants to merge 3 commits into from
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add a mapping ability to the interpolate method #7699

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2441794
add a mapping ability to the interpolate method
rocman May 23, 2016
0688523
rollback one line
rocman May 23, 2016
78e47b4
mapping(outputMin) -> mapping(outputMax)
rocman May 25, 2016
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19 changes: 13 additions & 6 deletions Libraries/Animated/src/Interpolation.js
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Original file line number Diff line number Diff line change
Expand Up @@ -75,6 +75,7 @@ class Interpolation {
);

var range = findRange(input, inputRange);
var mapping = config.mapping || passThrough;
return interpolate(
input,
inputRange[range],
Expand All @@ -84,11 +85,16 @@ class Interpolation {
easing,
extrapolateLeft,
extrapolateRight,
mapping,
);
};
}
}

function passThrough(input: any): any {
return input;
}

function interpolate(
input: number,
inputMin: number,
Expand All @@ -98,13 +104,14 @@ function interpolate(
easing: ((input: number) => number),
extrapolateLeft: ExtrapolateType,
extrapolateRight: ExtrapolateType,
mapping: ((input: number) => any)
) {
var result = input;

// Extrapolate
if (result < inputMin) {
if (extrapolateLeft === 'identity') {
return result;
return mapping(result);
} else if (extrapolateLeft === 'clamp') {
result = inputMin;
} else if (extrapolateLeft === 'extend') {
Expand All @@ -114,7 +121,7 @@ function interpolate(

if (result > inputMax) {
if (extrapolateRight === 'identity') {
return result;
return mapping(result);
} else if (extrapolateRight === 'clamp') {
result = inputMax;
} else if (extrapolateRight === 'extend') {
Expand All @@ -123,14 +130,14 @@ function interpolate(
}

if (outputMin === outputMax) {
return outputMin;
return mapping(outputMin);
}

if (inputMin === inputMax) {
if (input <= inputMin) {
return outputMin;
return mapping(outputMin);
}
return outputMax;
return mapping(outputMax);
}

// Input Range
Expand All @@ -154,7 +161,7 @@ function interpolate(
result = result * (outputMax - outputMin) + outputMin;
}

return result;
return mapping(result);
}

function colorToRgba(input: string): string {
Expand Down