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/****************************************************************************
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**
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** Copyright (C) 2015 The Qt Company Ltd
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** All rights reserved.
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** For any questions to The Qt Company, please use contact form at http://qt.io
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**
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** This file is part of the Qt Charts module.
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**
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** Licensees holding valid commercial license for Qt may use this file in
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** accordance with the Qt License Agreement provided with the Software
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** or, alternatively, in accordance with the terms contained in a written
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** agreement between you and The Qt Company.
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**
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** If you have questions regarding the use of this file, please use
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** contact form at http://qt.io
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**
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****************************************************************************/
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#include <private/logxydomain_p.h>
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#include <private/qabstractaxis_p.h>
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#include <QtCharts/QLogValueAxis>
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#include <QtCore/QtMath>
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#include <cmath>
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QT_CHARTS_BEGIN_NAMESPACE
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LogXYDomain::LogXYDomain(QObject *parent)
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: AbstractDomain(parent),
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m_logLeftX(0),
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m_logRightX(1),
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m_logBaseX(10)
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{
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}
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LogXYDomain::~LogXYDomain()
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{
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}
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void LogXYDomain::setRange(qreal minX, qreal maxX, qreal minY, qreal maxY)
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{
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bool axisXChanged = false;
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bool axisYChanged = false;
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adjustLogDomainRanges(minX, maxX);
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if (!qFuzzyCompare(m_minX, minX) || !qFuzzyCompare(m_maxX, maxX)) {
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m_minX = minX;
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m_maxX = maxX;
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axisXChanged = true;
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qreal logMinX = std::log10(m_minX) / std::log10(m_logBaseX);
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qreal logMaxX = std::log10(m_maxX) / std::log10(m_logBaseX);
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m_logLeftX = logMinX < logMaxX ? logMinX : logMaxX;
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m_logRightX = logMinX > logMaxX ? logMinX : logMaxX;
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if(!m_signalsBlocked)
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emit rangeHorizontalChanged(m_minX, m_maxX);
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}
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if (!qFuzzyIsNull(m_minY - minY) || !qFuzzyIsNull(m_maxY - maxY)) {
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m_minY = minY;
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m_maxY = maxY;
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axisYChanged = true;
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if (!m_signalsBlocked)
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emit rangeVerticalChanged(m_minY, m_maxY);
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}
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if (axisXChanged || axisYChanged)
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emit updated();
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}
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void LogXYDomain::zoomIn(const QRectF &rect)
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{
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storeZoomReset();
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qreal logLeftX = rect.left() * (m_logRightX - m_logLeftX) / m_size.width() + m_logLeftX;
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qreal logRightX = rect.right() * (m_logRightX - m_logLeftX) / m_size.width() + m_logLeftX;
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qreal leftX = qPow(m_logBaseX, logLeftX);
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qreal rightX = qPow(m_logBaseX, logRightX);
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qreal minX = leftX < rightX ? leftX : rightX;
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qreal maxX = leftX > rightX ? leftX : rightX;
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qreal dy = spanY() / m_size.height();
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qreal minY = m_minY;
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qreal maxY = m_maxY;
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minY = maxY - dy * rect.bottom();
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maxY = maxY - dy * rect.top();
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setRange(minX, maxX, minY, maxY);
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}
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void LogXYDomain::zoomOut(const QRectF &rect)
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{
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storeZoomReset();
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const qreal factorX = m_size.width() / rect.width();
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qreal logLeftX = m_logLeftX + (m_logRightX - m_logLeftX) / 2 * (1 - factorX);
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qreal logRIghtX = m_logLeftX + (m_logRightX - m_logLeftX) / 2 * (1 + factorX);
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qreal leftX = qPow(m_logBaseX, logLeftX);
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qreal rightX = qPow(m_logBaseX, logRIghtX);
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qreal minX = leftX < rightX ? leftX : rightX;
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qreal maxX = leftX > rightX ? leftX : rightX;
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qreal dy = spanY() / rect.height();
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qreal minY = m_minY;
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qreal maxY = m_maxY;
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maxY = minY + dy * rect.bottom();
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minY = maxY - dy * m_size.height();
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setRange(minX, maxX, minY, maxY);
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}
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void LogXYDomain::move(qreal dx, qreal dy)
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{
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qreal stepX = dx * (m_logRightX - m_logLeftX) / m_size.width();
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qreal leftX = qPow(m_logBaseX, m_logLeftX + stepX);
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qreal rightX = qPow(m_logBaseX, m_logRightX + stepX);
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qreal minX = leftX < rightX ? leftX : rightX;
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qreal maxX = leftX > rightX ? leftX : rightX;
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qreal y = spanY() / m_size.height();
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qreal minY = m_minY;
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qreal maxY = m_maxY;
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if (dy != 0) {
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minY = minY + y * dy;
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maxY = maxY + y * dy;
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}
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setRange(minX, maxX, minY, maxY);
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}
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QPointF LogXYDomain::calculateGeometryPoint(const QPointF &point, bool &ok) const
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{
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const qreal deltaX = m_size.width() / (m_logRightX - m_logLeftX);
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const qreal deltaY = m_size.height() / (m_maxY - m_minY);
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qreal x(0);
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qreal y = (point.y() - m_minY) * -deltaY + m_size.height();
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if (point.x() > 0) {
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x = (std::log10(point.x()) / std::log10(m_logBaseX)) * deltaX - m_logLeftX * deltaX;
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ok = true;
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} else {
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x = 0;
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qWarning() << "Logarithms of zero and negative values are undefined.";
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ok = false;
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}
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return QPointF(x, y);
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}
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QVector<QPointF> LogXYDomain::calculateGeometryPoints(const QList<QPointF> &vector) const
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{
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const qreal deltaX = m_size.width() / (m_logRightX - m_logLeftX);
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const qreal deltaY = m_size.height() / (m_maxY - m_minY);
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QVector<QPointF> result;
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result.resize(vector.count());
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for (int i = 0; i < vector.count(); ++i) {
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if (vector[i].x() > 0) {
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qreal x = (std::log10(vector[i].x()) / std::log10(m_logBaseX)) * deltaX - m_logLeftX * deltaX;
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qreal y = (vector[i].y() - m_minY) * -deltaY + m_size.height();
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result[i].setX(x);
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result[i].setY(y);
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} else {
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qWarning() << "Logarithms of zero and negative values are undefined.";
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return QVector<QPointF>();
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}
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}
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return result;
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}
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QPointF LogXYDomain::calculateDomainPoint(const QPointF &point) const
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{
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const qreal deltaX = m_size.width() / (m_logRightX - m_logLeftX);
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const qreal deltaY = m_size.height() / (m_maxY - m_minY);
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qreal x = qPow(m_logBaseX, m_logLeftX + point.x() / deltaX);
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qreal y = (point.y() - m_size.height()) / (-deltaY) + m_minY;
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return QPointF(x, y);
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}
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bool LogXYDomain::attachAxis(QAbstractAxis *axis)
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{
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AbstractDomain::attachAxis(axis);
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QLogValueAxis *logAxis = qobject_cast<QLogValueAxis *>(axis);
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if (logAxis && logAxis->orientation() == Qt::Horizontal) {
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QObject::connect(logAxis, SIGNAL(baseChanged(qreal)), this, SLOT(handleHorizontalAxisBaseChanged(qreal)));
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handleHorizontalAxisBaseChanged(logAxis->base());
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}
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return true;
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}
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bool LogXYDomain::detachAxis(QAbstractAxis *axis)
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{
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AbstractDomain::detachAxis(axis);
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QLogValueAxis *logAxis = qobject_cast<QLogValueAxis *>(axis);
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if (logAxis && logAxis->orientation() == Qt::Horizontal)
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QObject::disconnect(logAxis, SIGNAL(baseChanged(qreal)), this, SLOT(handleHorizontalAxisBaseChanged(qreal)));
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return true;
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}
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void LogXYDomain::handleHorizontalAxisBaseChanged(qreal baseX)
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{
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m_logBaseX = baseX;
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qreal logMinX = std::log10(m_minX) / std::log10(m_logBaseX);
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qreal logMaxX = std::log10(m_maxX) / std::log10(m_logBaseX);
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m_logLeftX = logMinX < logMaxX ? logMinX : logMaxX;
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m_logRightX = logMinX > logMaxX ? logMinX : logMaxX;
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emit updated();
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}
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// operators
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bool QT_CHARTS_AUTOTEST_EXPORT operator== (const LogXYDomain &domain1, const LogXYDomain &domain2)
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{
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return (qFuzzyIsNull(domain1.m_maxX - domain2.m_maxX)
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&& qFuzzyIsNull(domain1.m_maxY - domain2.m_maxY)
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&& qFuzzyIsNull(domain1.m_minX - domain2.m_minX)
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&& qFuzzyIsNull(domain1.m_minY - domain2.m_minY));
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}
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bool QT_CHARTS_AUTOTEST_EXPORT operator!= (const LogXYDomain &domain1, const LogXYDomain &domain2)
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{
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return !(domain1 == domain2);
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}
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QDebug QT_CHARTS_AUTOTEST_EXPORT operator<<(QDebug dbg, const LogXYDomain &domain)
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{
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#ifdef QT_NO_TEXTSTREAM
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Q_UNUSED(domain)
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#else
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dbg.nospace() << "AbstractDomain(" << domain.m_minX << ',' << domain.m_maxX << ',' << domain.m_minY << ',' << domain.m_maxY << ')' << domain.m_size;
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#endif
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return dbg.maybeSpace();
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}
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#include "moc_logxydomain_p.cpp"
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QT_CHARTS_END_NAMESPACE
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