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