68 lines
2.1 KiB
Dart
68 lines
2.1 KiB
Dart
import 'dart:math';
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class Utils {
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// static double roundToDecimalPlaces(double value, int precision) {
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// double mod = pow(10.0, precision).toDouble();
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// return ((value * mod).round().toDouble() / mod);
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// }
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static double roundToMultipleOfBase(double value, double base) {
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double result = value;
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double remainder = value % base;
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int precision = Utils.getFractionDigitsLength(base);
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if (remainder != 0) {
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result = Utils.addDoublesWithPrecision(result, -remainder, precision);
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if (remainder > base / 2) {
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result = Utils.addDoublesWithPrecision(result, base, precision);
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}
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}
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return result;
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}
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static double addDoublesWithPrecision(double a, double b, int precision) {
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double mod = pow(10.0, precision).toDouble();
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double difference = (a * mod) + (b * mod);
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return difference.round() / mod;
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}
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static int getFractionDigitsLength(double value) {
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final fractionDigits = value.toString().split('.');
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return fractionDigits[1] == '0' ? 0 : fractionDigits[1].length;
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}
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static String toStringMatchingTemplateFractionPrecision(
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double value, double template) {
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final precision = getFractionDigitsLength(template);
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return value.toStringAsFixed(precision);
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}
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static double convertMgPerDlToMmolPerL(int mgPerDl, {double step = 0.01}) {
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return Utils.roundToMultipleOfBase(mgPerDl * 0.0555, step);
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}
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static int convertMmolPerLToMgPerDl(double mmolPerL) {
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return (mmolPerL * 18.018).round();
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}
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static double calculateCarbs(double carbsRatio, double portionSize,
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{double step = 0.01}) {
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return Utils.roundToMultipleOfBase(carbsRatio * portionSize / 100, step);
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}
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static double calculateCarbsRatio(
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double carbsPerPortion, double portionSize, {double step = 0.01}) {
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return portionSize > 0
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? Utils.roundToMultipleOfBase(carbsPerPortion * 100 / portionSize, step)
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: 0;
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}
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static double calculatePortionSize(
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double carbsRatio, double carbsPerPortion, {double step = 0.01}) {
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return carbsRatio > 0
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? Utils.roundToMultipleOfBase(carbsPerPortion * 100 / carbsRatio, step)
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: 0;
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}
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}
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