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// SPDX-FileCopyrightText: 2005 Pino Toscano <toscano.pino@tiscali.it>
// SPDX-License-Identifier: GPL-2.0-or-later
#include "equationstring.h"
#include <cmath>
#include <QLocale>
/*
* Definitions for EquationString
*/
EquationString::EquationString(const QString &s)
: QString(s)
{
}
double EquationString::trunc(double d)
{
if (std::fabs(d) < 1e-7)
return 0.0;
return d;
}
void EquationString::addTerm(double coeff, const QString &monomial, bool &needsign)
{
if (trunc(coeff) == 0.0)
return;
if (needsign) {
if (coeff < 0) {
append(" - ");
} else {
append(" + ");
}
} else {
needsign = true;
if (coeff < 0) {
append("- ");
}
}
coeff = std::fabs(coeff);
if (monomial.isEmpty() || std::fabs(coeff - 1.0) > 1e-6)
append(QLocale().toString(coeff, 'f', 3));
if (!monomial.isEmpty()) {
append(" ");
append(monomial);
}
return;
}
const QString EquationString::x3() const
{
return QStringLiteral("x³");
}
const QString EquationString::y3() const
{
return QStringLiteral("y³");
}
const QString EquationString::x2y() const
{
return QStringLiteral("x²y");
}
const QString EquationString::xy2() const
{
return QStringLiteral("xy²");
}
const QString EquationString::x2() const
{
return QStringLiteral("x²");
}
const QString EquationString::y2() const
{
return QStringLiteral("y²");
}
const QString EquationString::xy() const
{
return QStringLiteral("xy");
}
const QString EquationString::x() const
{
return QStringLiteral("x");
}
const QString EquationString::y() const
{
return QStringLiteral("y");
}
/* used in the circle equation */
void EquationString::prettify(void)
{
replace(QLatin1String("( x )"), QLatin1String("x"));
replace(QLatin1String("( y )"), QLatin1String("y"));
}
const QString EquationString::xnym(int n, int m) const
{
QString ret = QLatin1String("");
switch (n) {
case 0:
break;
case 1:
ret += 'x';
break;
case 2:
ret += QStringLiteral("x²");
break;
case 3:
ret += QStringLiteral("x³");
break;
case 4:
ret += QStringLiteral("x⁴");
break;
case 5:
ret += QStringLiteral("x⁵");
break;
case 6:
ret += QStringLiteral("x⁶");
break;
default:
ret += QLatin1String("x^") + QString::number(n);
}
switch (m) {
case 0:
break;
case 1:
ret += 'y';
break;
case 2:
ret += QStringLiteral("y²");
break;
case 3:
ret += QStringLiteral("y³");
break;
case 4:
ret += QStringLiteral("y⁴");
break;
case 5:
ret += QStringLiteral("y⁵");
break;
case 6:
ret += QStringLiteral("y⁶");
break;
default:
ret += QLatin1String("y^") + QString::number(n);
}
return ret;
}
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