chartlogvalueaxisy.cpp
158 lines
| 5.7 KiB
| text/x-c
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CppLexer
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r0 | /**************************************************************************** | ||
** | ||||
** Copyright (C) 2016 The Qt Company Ltd. | ||||
** Contact: https://www.qt.io/licensing/ | ||||
** | ||||
** This file is part of the Qt Charts module of the Qt Toolkit. | ||||
** | ||||
** $QT_BEGIN_LICENSE:GPL$ | ||||
** Commercial License Usage | ||||
** Licensees holding valid commercial Qt licenses may use this file in | ||||
** accordance with the commercial license agreement provided with the | ||||
** Software or, alternatively, in accordance with the terms contained in | ||||
** a written agreement between you and The Qt Company. For licensing terms | ||||
** and conditions see https://www.qt.io/terms-conditions. For further | ||||
** information use the contact form at https://www.qt.io/contact-us. | ||||
** | ||||
** GNU General Public License Usage | ||||
** Alternatively, this file may be used under the terms of the GNU | ||||
** General Public License version 3 or (at your option) any later version | ||||
** approved by the KDE Free Qt Foundation. The licenses are as published by | ||||
** the Free Software Foundation and appearing in the file LICENSE.GPL3 | ||||
** included in the packaging of this file. Please review the following | ||||
** information to ensure the GNU General Public License requirements will | ||||
** be met: https://www.gnu.org/licenses/gpl-3.0.html. | ||||
** | ||||
** $QT_END_LICENSE$ | ||||
** | ||||
****************************************************************************/ | ||||
#include <private/chartlogvalueaxisy_p.h> | ||||
#include <private/chartpresenter_p.h> | ||||
#include <QtCharts/QLogValueAxis> | ||||
#include <private/abstractchartlayout_p.h> | ||||
#include <QtWidgets/QGraphicsLayout> | ||||
#include <QtCore/QtMath> | ||||
#include <QtCore/QDebug> | ||||
#include <cmath> | ||||
QT_CHARTS_BEGIN_NAMESPACE | ||||
ChartLogValueAxisY::ChartLogValueAxisY(QLogValueAxis *axis, QGraphicsItem *item) | ||||
: VerticalAxis(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))); | ||||
} | ||||
ChartLogValueAxisY::~ChartLogValueAxisY() | ||||
{ | ||||
} | ||||
QVector<qreal> ChartLogValueAxisY::calculateLayout() const | ||||
{ | ||||
QVector<qreal> points; | ||||
qreal logMax = std::log10(m_axis->max()) / std::log10(m_axis->base()); | ||||
qreal logMin = std::log10(m_axis->min()) / std::log10(m_axis->base()); | ||||
qreal leftEdge = logMin < logMax ? logMin : logMax; | ||||
qreal ceilEdge = qCeil(leftEdge); | ||||
int tickCount = qAbs(qCeil(logMax) - qCeil(logMin)); | ||||
// If the high edge sits exactly on the tick value, add a tick | ||||
qreal highValue = logMin < logMax ? logMax : logMin; | ||||
if (qFuzzyCompare(highValue, qreal(qCeil(highValue)))) | ||||
tickCount++; | ||||
points.resize(tickCount); | ||||
const QRectF &gridRect = gridGeometry(); | ||||
const qreal deltaY = gridRect.height() / qAbs(logMax - logMin); | ||||
for (int i = 0; i < tickCount; ++i) | ||||
points[i] = (ceilEdge + qreal(i)) * -deltaY - leftEdge * -deltaY + gridRect.bottom(); | ||||
return points; | ||||
} | ||||
void ChartLogValueAxisY::updateGeometry() | ||||
{ | ||||
const QVector<qreal> &layout = ChartAxisElement::layout(); | ||||
setLabels(createLogValueLabels(m_axis->min(), m_axis->max(), m_axis->base(), layout.size(), m_axis->labelFormat())); | ||||
VerticalAxis::updateGeometry(); | ||||
} | ||||
void ChartLogValueAxisY::handleBaseChanged(qreal base) | ||||
{ | ||||
Q_UNUSED(base); | ||||
QGraphicsLayoutItem::updateGeometry(); | ||||
if(presenter()) presenter()->layout()->invalidate(); | ||||
} | ||||
void ChartLogValueAxisY::handleLabelFormatChanged(const QString &format) | ||||
{ | ||||
Q_UNUSED(format); | ||||
QGraphicsLayoutItem::updateGeometry(); | ||||
if(presenter()) presenter()->layout()->invalidate(); | ||||
} | ||||
QSizeF ChartLogValueAxisY::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const | ||||
{ | ||||
Q_UNUSED(constraint) | ||||
QSizeF sh; | ||||
QSizeF base = VerticalAxis::sizeHint(which, constraint); | ||||
QStringList ticksList; | ||||
qreal logMax = std::log10(m_axis->max()) / std::log10(m_axis->base()); | ||||
qreal logMin = std::log10(m_axis->min()) / std::log10(m_axis->base()); | ||||
int tickCount = qAbs(qCeil(logMax) - qCeil(logMin)); | ||||
// If the high edge sits exactly on the tick value, add a tick | ||||
qreal highValue = logMin < logMax ? logMax : logMin; | ||||
if (qFuzzyCompare(highValue, qreal(qCeil(highValue)))) | ||||
tickCount++; | ||||
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(" ")); | ||||
qreal width = 0; | ||||
// Height of vertical axis sizeHint indicates the maximum distance labels can extend past | ||||
// first and last ticks. Base height is irrelevant. | ||||
qreal height = 0; | ||||
switch (which) { | ||||
case Qt::MinimumSize: { | ||||
QRectF boundingRect = ChartPresenter::textBoundingRect(axis()->labelsFont(), | ||||
QStringLiteral("..."), | ||||
axis()->labelsAngle()); | ||||
width = boundingRect.width() + labelPadding() + base.width() + 1.0; | ||||
height = boundingRect.height() / 2.0; | ||||
sh = QSizeF(width, height); | ||||
break; | ||||
} | ||||
case Qt::PreferredSize: { | ||||
qreal labelWidth = 0.0; | ||||
qreal firstHeight = -1.0; | ||||
foreach (const QString& s, ticksList) { | ||||
QRectF rect = ChartPresenter::textBoundingRect(axis()->labelsFont(), s, axis()->labelsAngle()); | ||||
labelWidth = qMax(rect.width(), labelWidth); | ||||
height = rect.height(); | ||||
if (firstHeight < 0.0) | ||||
firstHeight = height; | ||||
} | ||||
width = labelWidth + labelPadding() + base.width() + 2.0; //two pixels of tolerance | ||||
height = qMax(height, firstHeight) / 2.0; | ||||
sh = QSizeF(width, height); | ||||
break; | ||||
} | ||||
default: | ||||
break; | ||||
} | ||||
return sh; | ||||
} | ||||
#include "moc_chartlogvalueaxisy_p.cpp" | ||||
QT_CHARTS_END_NAMESPACE | ||||