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// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#include <private/xlogydomain_p.h>
#include <private/qabstractaxis_p.h>
#include <QtCharts/QLogValueAxis>
#include <QtCore/QtMath>
#include <cmath>
QT_BEGIN_NAMESPACE
XLogYDomain::XLogYDomain(QObject *parent)
: AbstractDomain(parent),
m_logLeftY(0),
m_logRightY(1),
m_logBaseY(10)
{
}
XLogYDomain::~XLogYDomain()
{
}
void XLogYDomain::setRange(qreal minX, qreal maxX, qreal minY, qreal maxY)
{
bool axisXChanged = false;
bool axisYChanged = false;
adjustLogDomainRanges(minY, maxY);
if (!qFuzzyIsNull(m_minX - minX) || !qFuzzyIsNull(m_maxX - maxX)) {
m_minX = minX;
m_maxX = maxX;
axisXChanged = true;
if(!m_signalsBlocked)
emit rangeHorizontalChanged(m_minX, m_maxX);
}
if (!qFuzzyIsNull(m_minY - minY) || !qFuzzyIsNull(m_maxY - maxY)) {
m_minY = minY;
m_maxY = maxY;
axisYChanged = true;
qreal logMinY = qLn(m_minY) / qLn(m_logBaseY);
qreal logMaxY = qLn(m_maxY) / qLn(m_logBaseY);
m_logLeftY = logMinY < logMaxY ? logMinY : logMaxY;
m_logRightY = logMinY > logMaxY ? logMinY : logMaxY;
if (!m_signalsBlocked)
emit rangeVerticalChanged(m_minY, m_maxY);
}
if (axisXChanged || axisYChanged)
emit updated();
}
void XLogYDomain::zoomIn(const QRectF &rect)
{
storeZoomReset();
QRectF fixedRect = fixZoomRect(rect);
qreal dx = spanX() / m_size.width();
qreal maxX = m_maxX;
qreal minX = m_minX;
maxX = minX + dx * fixedRect.right();
minX = minX + dx * fixedRect.left();
qreal logLeftY = m_logRightY - fixedRect.bottom() * (m_logRightY - m_logLeftY) / m_size.height();
qreal logRightY = m_logRightY - fixedRect.top() * (m_logRightY - m_logLeftY) / m_size.height();
qreal leftY = qPow(m_logBaseY, logLeftY);
qreal rightY = qPow(m_logBaseY, logRightY);
qreal minY = leftY < rightY ? leftY : rightY;
qreal maxY = leftY > rightY ? leftY : rightY;
setRange(minX, maxX, minY, maxY);
}
void XLogYDomain::zoomOut(const QRectF &rect)
{
storeZoomReset();
QRectF fixedRect = fixZoomRect(rect);
qreal dx = spanX() / fixedRect.width();
qreal maxX = m_maxX;
qreal minX = m_minX;
minX = maxX - dx * fixedRect.right();
maxX = minX + dx * m_size.width();
const qreal factorY = m_size.height() / fixedRect.height();
qreal newLogMinY = m_logLeftY + (m_logRightY - m_logLeftY) / 2 * (1 - factorY);
qreal newLogMaxY = m_logLeftY + (m_logRightY - m_logLeftY) / 2 * (1 + factorY);
qreal leftY = qPow(m_logBaseY, newLogMinY);
qreal rightY = qPow(m_logBaseY, newLogMaxY);
qreal minY = leftY < rightY ? leftY : rightY;
qreal maxY = leftY > rightY ? leftY : rightY;
if (newLogMaxY > m_size.height())
return;
if (qIsInf(maxY))
return;
setRange(minX, maxX, minY, maxY);
}
void XLogYDomain::move(qreal dx, qreal dy)
{
if (m_reverseX)
dx = -dx;
if (m_reverseY)
dy = -dy;
qreal x = spanX() / m_size.width();
qreal maxX = m_maxX;
qreal minX = m_minX;
if (dx != 0) {
minX = minX + x * dx;
maxX = maxX + x * dx;
}
qreal stepY = dy * (m_logRightY - m_logLeftY) / m_size.height();
qreal leftY = qPow(m_logBaseY, m_logLeftY + stepY);
qreal rightY = qPow(m_logBaseY, m_logRightY + stepY);
qreal minY = leftY < rightY ? leftY : rightY;
qreal maxY = leftY > rightY ? leftY : rightY;
setRange(minX, maxX, minY, maxY);
}
QPointF XLogYDomain::calculateGeometryPoint(const QPointF &point, bool &ok) const
{
const qreal deltaX = m_size.width() / (m_maxX - m_minX);
const qreal deltaY = m_size.height() / qAbs(m_logRightY - m_logLeftY);
qreal x = (point.x() - m_minX) * deltaX;
if (m_reverseX)
x = m_size.width() - x;
qreal y(0);
if (point.y() > 0) {
y = ((qLn(point.y()) / qLn(m_logBaseY)) - m_logLeftY) * deltaY;
if (!m_reverseY)
y = m_size.height() - y;
ok = true;
} else {
y = m_size.height();
qWarning() << "Logarithms of zero and negative values are undefined.";
ok = false;
}
return QPointF(x, y);
}
QList<QPointF> XLogYDomain::calculateGeometryPoints(const QList<QPointF> &list) const
{
const qreal deltaX = m_size.width() / (m_maxX - m_minX);
const qreal deltaY = m_size.height() / qAbs(m_logRightY - m_logLeftY);
QList<QPointF> result;
result.resize(list.size());
for (int i = 0; i < list.size(); ++i) {
if (list[i].y() > 0) {
qreal x = (list[i].x() - m_minX) * deltaX;
if (m_reverseX)
x = m_size.width() - x;
qreal y = ((qLn(list[i].y()) / qLn(m_logBaseY)) - m_logLeftY) * deltaY;
if (!m_reverseY)
y = m_size.height() - y;
result[i].setX(x);
result[i].setY(y);
} else {
qWarning() << "Logarithms of zero and negative values are undefined.";
return QList<QPointF>();
}
}
return result;
}
QPointF XLogYDomain::calculateDomainPoint(const QPointF &point) const
{
const qreal deltaX = m_size.width() / (m_maxX - m_minX);
const qreal deltaY = m_size.height() / qAbs(m_logRightY - m_logLeftY);
qreal x = m_reverseX ? (m_size.width() - point.x()) : point.x();
x /= deltaX;
x += m_minX;
qreal y = m_reverseY ? point.y() : (m_size.height() - point.y());
y = qPow(m_logBaseY, m_logLeftY + y / deltaY);
return QPointF(x, y);
}
bool XLogYDomain::attachAxis(QAbstractAxis *axis)
{
QLogValueAxis *logAxis = qobject_cast<QLogValueAxis *>(axis);
if (logAxis && logAxis->orientation() == Qt::Vertical) {
QObject::connect(logAxis, SIGNAL(baseChanged(qreal)), this, SLOT(handleVerticalAxisBaseChanged(qreal)));
handleVerticalAxisBaseChanged(logAxis->base());
}
return AbstractDomain::attachAxis(axis);
}
bool XLogYDomain::detachAxis(QAbstractAxis *axis)
{
QLogValueAxis *logAxis = qobject_cast<QLogValueAxis *>(axis);
if (logAxis && logAxis->orientation() == Qt::Vertical)
QObject::disconnect(logAxis, SIGNAL(baseChanged(qreal)), this, SLOT(handleVerticalAxisBaseChanged(qreal)));
return AbstractDomain::detachAxis(axis);
}
void XLogYDomain::handleVerticalAxisBaseChanged(qreal baseY)
{
m_logBaseY = baseY;
qreal logMinY = qLn(m_minY) / qLn(m_logBaseY);
qreal logMaxY = qLn(m_maxY) / qLn(m_logBaseY);
m_logLeftY = logMinY < logMaxY ? logMinY : logMaxY;
m_logRightY = logMinY > logMaxY ? logMinY : logMaxY;
emit updated();
}
// operators
bool Q_AUTOTEST_EXPORT operator== (const XLogYDomain &domain1, const XLogYDomain &domain2)
{
return (qFuzzyIsNull(domain1.m_maxX - domain2.m_maxX)
&& qFuzzyIsNull(domain1.m_maxY - domain2.m_maxY)
&& qFuzzyIsNull(domain1.m_minX - domain2.m_minX)
&& qFuzzyIsNull(domain1.m_minY - domain2.m_minY));
}
bool Q_AUTOTEST_EXPORT operator!= (const XLogYDomain &domain1, const XLogYDomain &domain2)
{
return !(domain1 == domain2);
}
QDebug Q_AUTOTEST_EXPORT operator<<(QDebug dbg, const XLogYDomain &domain)
{
#ifdef QT_NO_TEXTSTREAM
Q_UNUSED(domain);
#else
dbg.nospace() << "AbstractDomain(" << domain.m_minX << ',' << domain.m_maxX << ',' << domain.m_minY << ',' << domain.m_maxY << ')' << domain.m_size;
#endif
return dbg.maybeSpace();
}
QT_END_NAMESPACE
#include "moc_xlogydomain_p.cpp"
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