99 lines
3.9 KiB
JavaScript
99 lines
3.9 KiB
JavaScript
import { lessThan, multiply, sub, add, divide, greaterThan, lessOrEq, eq } from '../operators';
|
|
import invariant from 'fbjs/lib/invariant';
|
|
import AnimatedNode from '../core/AnimatedNode';
|
|
import { createAnimatedCond as cond } from '../core/AnimatedCond';
|
|
import { createAnimatedFunction as proc } from '../core/AnimatedFunction';
|
|
const interpolateInternalSingleProc = proc(function (value, inS, inE, outS, outE) {
|
|
const progress = divide(sub(value, inS), sub(inE, inS)); // logic below was made in order to provide a compatibility witn an Animated API
|
|
|
|
const resultForNonZeroRange = add(outS, multiply(progress, sub(outE, outS)));
|
|
const result = cond(eq(inS, inE), cond(lessOrEq(value, inS), outS, outE), resultForNonZeroRange);
|
|
return result;
|
|
});
|
|
|
|
function interpolateInternalSingle(value, inputRange, outputRange, offset) {
|
|
const inS = inputRange[offset];
|
|
const inE = inputRange[offset + 1];
|
|
const outS = outputRange[offset];
|
|
const outE = outputRange[offset + 1];
|
|
return interpolateInternalSingleProc(value, inS, inE, outS, outE);
|
|
}
|
|
|
|
function interpolateInternal(value, inputRange, outputRange, offset = 0) {
|
|
if (inputRange.length - offset === 2) {
|
|
return interpolateInternalSingle(value, inputRange, outputRange, offset);
|
|
}
|
|
|
|
return cond(lessThan(value, inputRange[offset + 1]), interpolateInternalSingle(value, inputRange, outputRange, offset), interpolateInternal(value, inputRange, outputRange, offset + 1));
|
|
}
|
|
|
|
export const Extrapolate = {
|
|
EXTEND: 'extend',
|
|
CLAMP: 'clamp',
|
|
IDENTITY: 'identity'
|
|
};
|
|
|
|
function checkNonDecreasing(name, arr) {
|
|
for (let i = 1; i < arr.length; ++i) {
|
|
// We can't validate animated nodes in JS.
|
|
if (arr[i] instanceof AnimatedNode || arr[i - 1] instanceof AnimatedNode) continue;
|
|
invariant(arr[i] >= arr[i - 1], '%s must be monotonically non-decreasing. (%s)', name, arr);
|
|
}
|
|
}
|
|
|
|
function checkMinElements(name, arr) {
|
|
invariant(arr.length >= 2, '%s must have at least 2 elements. (%s)', name, arr);
|
|
}
|
|
|
|
function checkValidNumbers(name, arr) {
|
|
for (let i = 0; i < arr.length; i++) {
|
|
// We can't validate animated nodes in JS.
|
|
if (arr[i] instanceof AnimatedNode || typeof arr[i] !== 'number') continue;
|
|
invariant(Number.isFinite(arr[i]), '%s cannot include %s. (%s)', name, arr[i], arr);
|
|
}
|
|
}
|
|
|
|
function convertToRadians(outputRange) {
|
|
for (const [i, value] of outputRange.entries()) {
|
|
if (typeof value === 'string' && value.endsWith('deg')) {
|
|
outputRange[i] = parseFloat(value) * (Math.PI / 180);
|
|
} else if (typeof value === 'string' && value.endsWith('rad')) {
|
|
outputRange[i] = parseFloat(value);
|
|
}
|
|
}
|
|
}
|
|
|
|
export default function interpolate(value, config) {
|
|
const {
|
|
inputRange,
|
|
outputRange,
|
|
extrapolate = Extrapolate.EXTEND,
|
|
extrapolateLeft,
|
|
extrapolateRight
|
|
} = config;
|
|
checkMinElements('inputRange', inputRange);
|
|
checkValidNumbers('inputRange', inputRange);
|
|
checkMinElements('outputRange', outputRange);
|
|
checkValidNumbers('outputRange', outputRange);
|
|
checkNonDecreasing('inputRange', inputRange);
|
|
invariant(inputRange.length === outputRange.length, 'inputRange and outputRange must be the same length.');
|
|
convertToRadians(outputRange);
|
|
const left = extrapolateLeft || extrapolate;
|
|
const right = extrapolateRight || extrapolate;
|
|
let output = interpolateInternal(value, inputRange, outputRange);
|
|
|
|
if (left === Extrapolate.EXTEND) {} else if (left === Extrapolate.CLAMP) {
|
|
output = cond(lessThan(value, inputRange[0]), outputRange[0], output);
|
|
} else if (left === Extrapolate.IDENTITY) {
|
|
output = cond(lessThan(value, inputRange[0]), value, output);
|
|
}
|
|
|
|
if (right === Extrapolate.EXTEND) {} else if (right === Extrapolate.CLAMP) {
|
|
output = cond(greaterThan(value, inputRange[inputRange.length - 1]), outputRange[outputRange.length - 1], output);
|
|
} else if (right === Extrapolate.IDENTITY) {
|
|
output = cond(greaterThan(value, inputRange[inputRange.length - 1]), value, output);
|
|
}
|
|
|
|
return output;
|
|
}
|
|
//# sourceMappingURL=interpolate.js.map
|