67 lines
2.3 KiB
C++
67 lines
2.3 KiB
C++
#ifndef UTILH_H
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#define UTILH_H
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#include <complex>
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#include <math.h>
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#include <limits>
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#include <vector>
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#include <QColor>
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namespace Util {
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template<typename T> T Scale(T value, T from_low, T from_high, T to_low, T to_high) {
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value -= from_low;
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value *= (to_high - to_low) / (from_high - from_low);
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value += to_low;
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return value;
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}
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static inline double SparamTodB(double d) {
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return 20*log10(d);
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}
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static inline double SparamTodB(std::complex<double> d) {
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return SparamTodB(abs(d));
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}
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static inline double SparamToDegree(std::complex<double> d) {
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return (arg(d) * 180.0 / M_PI);
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}
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static inline double SparamToVSWR(double d) {
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if(abs(d) < 1.0) {
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return (1+abs(d)) / (1-abs(d));
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} else {
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return std::numeric_limits<double>::quiet_NaN();
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}
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}
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static inline double SparamToVSWR(std::complex<double> d) {
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return SparamToVSWR(abs(d));
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}
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static inline std::complex<double> SparamToImpedance(std::complex<double> d) {
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return 50.0 * (1.0 + d) / (1.0 - d);
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}
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// all these conversions assume series connection of real and imag part
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static inline double SparamToResistance(std::complex<double> d) {
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return SparamToImpedance(d).real();
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}
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static inline double SparamToCapacitance(std::complex<double> d, double freq) {
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return -1.0 / (SparamToImpedance(d).imag() * 2.0 * M_PI * freq);
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}
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static inline double SparamToInductance(std::complex<double> d, double freq) {
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return SparamToImpedance(d).imag() / (2.0 * M_PI * freq);
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}
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static inline double SparamToQualityFactor(std::complex<double> d) {
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return abs(d.imag()) / d.real();
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}
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// attempts to return a font color with good contrast against the given background color
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static inline QColor getFontColorFromBackground(QColor q) {
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auto brightness = q.redF() * 0.299 + q.greenF() * 0.587 + q.blueF() * 0.114;
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return brightness > 0.6 ? Qt::black : Qt::white;
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}
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void unwrapPhase(std::vector<double> &phase);
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// input values are Y coordinates, assumes evenly spaced linear X values from 0 to input.size() - 1
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void linearRegression(const std::vector<double> &input, double &B_0, double &B_1);
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}
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#endif // UTILH_H
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