95 lines
2.6 KiB
C++
95 lines
2.6 KiB
C++
#include "unit.h"
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#include <math.h>
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#include <sstream>
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#include <iomanip>
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#include <QDebug>
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using namespace std;
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double Unit::FromString(QString string, QString unit, QString prefixes)
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{
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if(string.size() == 0) {
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return std::numeric_limits<double>::quiet_NaN();
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}
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// remove unit if present
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if(string.endsWith(unit, Qt::CaseInsensitive)) {
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string.chop(unit.size());
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}
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// check if last char is a valid prefix
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double factor = 1.0;
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if(prefixes.contains(string.at(string.size()-1))) {
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QChar prefix = string.at(string.size()-1);
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factor = SIPrefixToFactor(prefix.toLatin1());
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string.chop(1);
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}
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bool convertOk;
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auto value = string.toDouble(&convertOk);
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if(!convertOk) {
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return std::numeric_limits<double>::quiet_NaN();
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}
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return value * factor;
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}
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QString Unit::ToString(double value, QString unit, QString prefixes, int precision)
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{
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// change label text
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QString sValue;
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if(isnan(value) || isinf(value)) {
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sValue.append("NaN");
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return sValue;
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} else if(value == 0.0) {
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sValue.append("0 ");
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} else {
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if(value < 0) {
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sValue.append('-');
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value = -value;
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}
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int preDotDigits = log10(value) + 2;
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int prefixIndex = prefixes.indexOf(' ');
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while(preDotDigits > 3 && prefixIndex < prefixes.length() - 1) {
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value /= 1000.0;
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preDotDigits -= 3;
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prefixIndex++;
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}
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while(preDotDigits<=1 && prefixIndex > 0) {
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value *= 1000.0;
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preDotDigits += 3;
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prefixIndex--;
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}
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stringstream ss;
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ss << std::fixed;
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if(preDotDigits >= 0) {
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if(precision - preDotDigits + 1 < 0) {
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ss << std::setprecision(0);
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} else {
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ss << std::setprecision(precision - preDotDigits + 1);
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}
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} else {
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ss << std::setprecision(precision - 1);
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}
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ss << value;
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sValue.append(QString::fromStdString(ss.str()));
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sValue.append(prefixes[prefixIndex]);
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}
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sValue.append(unit);
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return sValue;
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}
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double Unit::SIPrefixToFactor(char prefix)
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{
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switch(prefix) {
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case 'f': return 1e-15; break;
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case 'p': return 1e-12; break;
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case 'n': return 1e-9; break;
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case 'u': return 1e-6; break;
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case 'm': return 1e-3; break;
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case ' ': return 1e0; break;
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case 'k': return 1e3; break;
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case 'M': return 1e6; break;
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case 'G': return 1e9; break;
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case 'T': return 1e12; break;
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case 'P': return 1e15; break;
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default: return 0; break;
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}
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}
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