chartlogvalueaxisy.cpp
131 lines
| 4.1 KiB
| text/x-c
|
CppLexer
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r2274 | /**************************************************************************** | ||
** | ||||
** Copyright (C) 2012 Digia Plc | ||||
** All rights reserved. | ||||
** For any questions to Digia, please use contact form at http://qt.digia.com | ||||
** | ||||
** This file is part of the Qt Commercial Charts Add-on. | ||||
** | ||||
** $QT_BEGIN_LICENSE$ | ||||
** Licensees holding valid Qt Commercial licenses may use this file in | ||||
** accordance with the Qt Commercial License Agreement provided with the | ||||
** Software or, alternatively, in accordance with the terms contained in | ||||
** a written agreement between you and Digia. | ||||
** | ||||
** If you have questions regarding the use of this file, please use | ||||
** contact form at http://qt.digia.com | ||||
** $QT_END_LICENSE$ | ||||
** | ||||
****************************************************************************/ | ||||
#include "chartlogvalueaxisy_p.h" | ||||
#include "chartpresenter_p.h" | ||||
#include "qlogvalueaxis.h" | ||||
#include "chartlayout_p.h" | ||||
#include <QGraphicsLayout> | ||||
#include <QFontMetrics> | ||||
#include <qmath.h> | ||||
QTCOMMERCIALCHART_BEGIN_NAMESPACE | ||||
ChartLogValueAxisY::ChartLogValueAxisY(QLogValueAxis *axis, QGraphicsItem* item) | ||||
: VerticalAxis(axis, item), | ||||
m_axis(axis) | ||||
{ | ||||
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r2322 | QObject::connect(m_axis, SIGNAL(baseChanged(qreal)),this, SLOT(handleBaseChanged(qreal))); | ||
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r2323 | QObject::connect(m_axis,SIGNAL(labelFormatChanged(QString)),this, SLOT(handleLabelFormatChanged(QString))); | ||
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r2274 | } | ||
ChartLogValueAxisY::~ChartLogValueAxisY() | ||||
{ | ||||
} | ||||
QVector<qreal> ChartLogValueAxisY::calculateLayout() const | ||||
{ | ||||
QVector<qreal> points; | ||||
qreal logMax = log10(m_axis->max()) / log10(m_axis->base()); | ||||
qreal logMin = log10(m_axis->min()) / log10(m_axis->base()); | ||||
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r2275 | qreal leftEdge = logMin < logMax ? logMin : logMax; | ||
qreal ceilEdge = ceil(leftEdge); | ||||
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r2274 | int tickCount = qAbs(qRound(logMax - logMin)); | ||
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r2275 | tickCount++; | ||
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r2274 | |||
points.resize(tickCount); | ||||
const QRectF &gridRect = gridGeometry(); | ||||
const qreal deltaY = gridRect.height() / qAbs(logMax - logMin); | ||||
for (int i = 0; i < tickCount; ++i) | ||||
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r2275 | points[i] = (ceilEdge + i) * -deltaY - leftEdge * -deltaY + gridRect.bottom(); | ||
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r2274 | |||
return points; | ||||
} | ||||
void ChartLogValueAxisY::updateGeometry() | ||||
{ | ||||
const QVector<qreal> &layout = ChartAxis::layout(); | ||||
if (layout.isEmpty()) | ||||
return; | ||||
setLabels(createLogValueLabels(m_axis->min(), m_axis->max(), m_axis->base(), layout.size(), m_axis->labelFormat())); | ||||
VerticalAxis::updateGeometry(); | ||||
} | ||||
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r2322 | void ChartLogValueAxisY::handleBaseChanged(qreal base) | ||
{ | ||||
Q_UNUSED(base); | ||||
if(presenter()) presenter()->layout()->invalidate(); | ||||
} | ||||
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r2274 | |||
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r2323 | void ChartLogValueAxisY::handleLabelFormatChanged(const QString &format) | ||
{ | ||||
Q_UNUSED(format); | ||||
if(presenter()) presenter()->layout()->invalidate(); | ||||
} | ||||
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r2274 | QSizeF ChartLogValueAxisY::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const | ||
{ | ||||
Q_UNUSED(constraint) | ||||
QFontMetrics fn(font()); | ||||
QSizeF sh; | ||||
QSizeF base = VerticalAxis::sizeHint(which, constraint); | ||||
QStringList ticksList; | ||||
qreal logMax = log10(m_axis->max()) / log10(m_axis->base()); | ||||
qreal logMin = log10(m_axis->min()) / log10(m_axis->base()); | ||||
int tickCount = qAbs(qRound(logMax - logMin)); | ||||
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r2275 | tickCount++; | ||
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r2274 | if (m_axis->max() > m_axis->min() && tickCount > 1) | ||
ticksList = createLogValueLabels(m_axis->min(), m_axis->max(), m_axis->base(), tickCount, m_axis->labelFormat()); | ||||
else | ||||
ticksList.append(QString(" ")); | ||||
qreal width = 0; | ||||
qreal height = 0; | ||||
switch (which) { | ||||
case Qt::MinimumSize: { | ||||
width = fn.boundingRect("...").width() + labelPadding(); | ||||
width += base.width(); | ||||
height = fn.height(); | ||||
height = qMax(height,base.height()); | ||||
sh = QSizeF(width,height); | ||||
break; | ||||
} | ||||
case Qt::PreferredSize: { | ||||
int count = qMax(ticksList.first().count() , ticksList.last().count()); | ||||
width = count*fn.averageCharWidth() + labelPadding() + 2; //two pixels of tolerance | ||||
width += base.width(); | ||||
height = fn.height() * ticksList.count(); | ||||
height = qMax(height,base.height()); | ||||
sh = QSizeF(width,height); | ||||
break; | ||||
} | ||||
default: | ||||
break; | ||||
} | ||||
return sh; | ||||
} | ||||
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r2322 | #include "moc_chartlogvalueaxisy_p.cpp" | ||
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r2274 | QTCOMMERCIALCHART_END_NAMESPACE | ||