chartlogvalueaxisy.cpp
120 lines
| 3.6 KiB
| text/x-c
|
CppLexer
Marek Rosa
|
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) | ||||
| { | ||||
| } | ||||
| 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); | ||||
|
Marek Rosa
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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(); | ||||
| } | ||||
| //void ChartLogValueAxisY::handleAxisUpdated() | ||||
| //{ | ||||
| // ChartAxis::handleAxisUpdated(); | ||||
| //} | ||||
| 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; | ||||
| } | ||||
| QTCOMMERCIALCHART_END_NAMESPACE | ||||