98 lines
3.2 KiB
Mathematica
98 lines
3.2 KiB
Mathematica
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/**
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* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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#import "RCTAnimationUtils.h"
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#import <React/RCTLog.h>
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static NSUInteger _RCTFindIndexOfNearestValue(CGFloat value, NSArray<NSNumber *> *range)
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{
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NSUInteger index;
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NSUInteger rangeCount = range.count;
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for (index = 1; index < rangeCount - 1; index++) {
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NSNumber *inputValue = range[index];
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if (inputValue.doubleValue >= value) {
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break;
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}
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}
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return index - 1;
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}
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/**
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* Interpolates value by remapping it linearly fromMin->fromMax to toMin->toMax
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*/
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CGFloat RCTInterpolateValue(CGFloat value,
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CGFloat inputMin,
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CGFloat inputMax,
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CGFloat outputMin,
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CGFloat outputMax,
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NSString *extrapolateLeft,
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NSString *extrapolateRight)
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{
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if (value < inputMin) {
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if ([extrapolateLeft isEqualToString:EXTRAPOLATE_TYPE_IDENTITY]) {
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return value;
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} else if ([extrapolateLeft isEqualToString:EXTRAPOLATE_TYPE_CLAMP]) {
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value = inputMin;
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} else if ([extrapolateLeft isEqualToString:EXTRAPOLATE_TYPE_EXTEND]) {
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// noop
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} else {
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RCTLogError(@"Invalid extrapolation type %@ for left extrapolation", extrapolateLeft);
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}
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}
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if (value > inputMax) {
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if ([extrapolateRight isEqualToString:EXTRAPOLATE_TYPE_IDENTITY]) {
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return value;
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} else if ([extrapolateRight isEqualToString:EXTRAPOLATE_TYPE_CLAMP]) {
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value = inputMax;
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} else if ([extrapolateRight isEqualToString:EXTRAPOLATE_TYPE_EXTEND]) {
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// noop
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} else {
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RCTLogError(@"Invalid extrapolation type %@ for right extrapolation", extrapolateRight);
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}
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}
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return outputMin + (value - inputMin) * (outputMax - outputMin) / (inputMax - inputMin);
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}
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/**
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* Interpolates value by mapping it from the inputRange to the outputRange.
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*/
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CGFloat RCTInterpolateValueInRange(CGFloat value,
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NSArray<NSNumber *> *inputRange,
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NSArray<NSNumber *> *outputRange,
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NSString *extrapolateLeft,
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NSString *extrapolateRight)
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{
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NSUInteger rangeIndex = _RCTFindIndexOfNearestValue(value, inputRange);
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CGFloat inputMin = inputRange[rangeIndex].doubleValue;
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CGFloat inputMax = inputRange[rangeIndex + 1].doubleValue;
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CGFloat outputMin = outputRange[rangeIndex].doubleValue;
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CGFloat outputMax = outputRange[rangeIndex + 1].doubleValue;
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return RCTInterpolateValue(value,
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inputMin,
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inputMax,
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outputMin,
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outputMax,
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extrapolateLeft,
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extrapolateRight);
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}
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CGFloat RCTRadiansToDegrees(CGFloat radians)
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{
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return radians * 180.0 / M_PI;
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}
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CGFloat RCTDegreesToRadians(CGFloat degrees)
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{
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return degrees / 180.0 * M_PI;
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}
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