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// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#undef QT_NO_FOREACH // this file contains unported legacy Q_FOREACH uses
#include <QtCharts/qlogvalueaxis.h>
#include <QtCore/qmath.h>
#include <QtWidgets/qgraphicslayout.h>
#include <private/abstractchartlayout_p.h>
#include <private/chartlogvalueaxisx_p.h>
#include <private/chartpresenter_p.h>
QT_BEGIN_NAMESPACE
ChartLogValueAxisX::ChartLogValueAxisX(QLogValueAxis *axis, QGraphicsItem *item)
: HorizontalAxis(axis, item),
m_axis(axis)
{
QObject::connect(m_axis, SIGNAL(baseChanged(qreal)), this, SLOT(handleBaseChanged(qreal)));
QObject::connect(m_axis, SIGNAL(labelFormatChanged(QString)), this, SLOT(handleLabelFormatChanged(QString)));
}
ChartLogValueAxisX::~ChartLogValueAxisX()
{
}
QList<qreal> ChartLogValueAxisX::calculateLayout() const
{
QList<qreal> points;
points.resize(m_axis->tickCount());
const qreal logMax = qLn(m_axis->max()) / qLn(m_axis->base());
const qreal logMin = qLn(m_axis->min()) / qLn(m_axis->base());
const qreal leftEdge = qMin(logMin, logMax);
const qreal ceilEdge = std::ceil(leftEdge);
const QRectF &gridRect = gridGeometry();
const qreal deltaX = gridRect.width() / qAbs(logMax - logMin);
for (int i = 0; i < m_axis->tickCount(); ++i)
points[i] = (ceilEdge + qreal(i)) * deltaX - leftEdge * deltaX + gridRect.left();
return points;
}
void ChartLogValueAxisX::updateGeometry()
{
const QList<qreal> &layout = ChartAxisElement::layout();
setLabels(createLogValueLabels(m_axis->min(), m_axis->max(), m_axis->base(), layout.size(), m_axis->labelFormat()));
HorizontalAxis::updateGeometry();
}
void ChartLogValueAxisX::handleBaseChanged(qreal base)
{
Q_UNUSED(base);
QGraphicsLayoutItem::updateGeometry();
if(presenter()) presenter()->layout()->invalidate();
}
void ChartLogValueAxisX::handleLabelFormatChanged(const QString &format)
{
Q_UNUSED(format);
QGraphicsLayoutItem::updateGeometry();
if(presenter()) presenter()->layout()->invalidate();
}
QSizeF ChartLogValueAxisX::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const
{
Q_UNUSED(constraint);
const QSizeF base = HorizontalAxis::sizeHint(which, constraint);
const int tickCount = m_axis->tickCount();
QStringList ticksList;
QSizeF sh;
if (m_axis->max() > m_axis->min() && tickCount > 0)
ticksList = createLogValueLabels(m_axis->min(), m_axis->max(), m_axis->base(), tickCount, m_axis->labelFormat());
else
ticksList.append(QStringLiteral(" "));
// Width of horizontal axis sizeHint indicates the maximum distance labels can extend past
// first and last ticks. Base width is irrelevant.
qreal width = 0;
qreal height = 0;
switch (which) {
case Qt::MinimumSize:{
if (labelsVisible()) {
QRectF boundingRect = ChartPresenter::textBoundingRect(axis()->labelsFont(),
QStringLiteral("..."),
axis()->labelsAngle());
width = boundingRect.width() / 2.0;
height = boundingRect.height() + labelPadding() + base.height() + 1.0;
} else {
width = 0;
height = base.height() + 1.0;
}
sh = QSizeF(width, height);
break;
}
case Qt::PreferredSize: {
if (labelsVisible()) {
qreal labelHeight = 0.0;
qreal firstWidth = -1.0;
foreach (const QString& s, ticksList) {
QRectF rect = ChartPresenter::textBoundingRect(axis()->labelsFont(), s, axis()->labelsAngle());
labelHeight = qMax(rect.height(), labelHeight);
width = rect.width();
if (firstWidth < 0.0)
firstWidth = width;
}
height = labelHeight + labelPadding() + base.height() + 1.0;
width = qMax(width, firstWidth) / 2.0;
} else {
height = base.height() + 1.0;
width = 0;
}
sh = QSizeF(width, height);
break;
}
default:
break;
}
return sh;
}
QT_END_NAMESPACE
#include "moc_chartlogvalueaxisx_p.cpp"
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