@tamagui/react-native-web-lite
Version:
React Native for Web
59 lines (58 loc) • 2.61 kB
JavaScript
var NEWTON_ITERATIONS = 4,
NEWTON_MIN_SLOPE = 1e-3,
SUBDIVISION_PRECISION = 1e-7,
SUBDIVISION_MAX_ITERATIONS = 10,
kSplineTableSize = 11,
kSampleStepSize = 1 / (kSplineTableSize - 1),
float32ArraySupported = typeof Float32Array == "function";
function A(aA1, aA2) {
return 1 - 3 * aA2 + 3 * aA1;
}
function B(aA1, aA2) {
return 3 * aA2 - 6 * aA1;
}
function C(aA1) {
return 3 * aA1;
}
function calcBezier(aT, aA1, aA2) {
return ((A(aA1, aA2) * aT + B(aA1, aA2)) * aT + C(aA1)) * aT;
}
function getSlope(aT, aA1, aA2) {
return 3 * A(aA1, aA2) * aT * aT + 2 * B(aA1, aA2) * aT + C(aA1);
}
function binarySubdivide(aX, _aA, _aB, mX1, mX2) {
var currentX,
currentT,
i = 0,
aA = _aA,
aB = _aB;
do currentT = aA + (aB - aA) / 2, currentX = calcBezier(currentT, mX1, mX2) - aX, currentX > 0 ? aB = currentT : aA = currentT; while (Math.abs(currentX) > SUBDIVISION_PRECISION && ++i < SUBDIVISION_MAX_ITERATIONS);
return currentT;
}
function newtonRaphsonIterate(aX, _aGuessT, mX1, mX2) {
for (var aGuessT = _aGuessT, i = 0; i < NEWTON_ITERATIONS; ++i) {
var currentSlope = getSlope(aGuessT, mX1, mX2);
if (currentSlope === 0) return aGuessT;
var currentX = calcBezier(aGuessT, mX1, mX2) - aX;
aGuessT -= currentX / currentSlope;
}
return aGuessT;
}
function bezier(mX1, mY1, mX2, mY2) {
if (!(mX1 >= 0 && mX1 <= 1 && mX2 >= 0 && mX2 <= 1)) throw new Error("bezier x values must be in [0, 1] range");
var sampleValues = float32ArraySupported ? new Float32Array(kSplineTableSize) : new Array(kSplineTableSize);
if (mX1 !== mY1 || mX2 !== mY2) for (var i = 0; i < kSplineTableSize; ++i) sampleValues[i] = calcBezier(i * kSampleStepSize, mX1, mX2);
function getTForX(aX) {
for (var intervalStart = 0, currentSample = 1, lastSample = kSplineTableSize - 1; currentSample !== lastSample && sampleValues[currentSample] <= aX; ++currentSample) intervalStart += kSampleStepSize;
--currentSample;
var dist = (aX - sampleValues[currentSample]) / (sampleValues[currentSample + 1] - sampleValues[currentSample]),
guessForT = intervalStart + dist * kSampleStepSize,
initialSlope = getSlope(guessForT, mX1, mX2);
return initialSlope >= NEWTON_MIN_SLOPE ? newtonRaphsonIterate(aX, guessForT, mX1, mX2) : initialSlope === 0 ? guessForT : binarySubdivide(aX, intervalStart, intervalStart + kSampleStepSize, mX1, mX2);
}
return function (x) {
return mX1 === mY1 && mX2 === mY2 ? x : x === 0 ? 0 : x === 1 ? 1 : calcBezier(getTForX(x), mY1, mY2);
};
}
export { bezier as default };
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