chartdatetimeaxisx.cpp
136 lines
| 4.4 KiB
| text/x-c
|
CppLexer
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r1717 | /**************************************************************************** | ||
** | ||||
** 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 "chartdatetimeaxisx_p.h" | ||||
#include "chartpresenter_p.h" | ||||
#include "qdatetimeaxis.h" | ||||
#include <QGraphicsLayout> | ||||
#include <QDateTime> | ||||
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r1735 | #include <QFontMetrics> | ||
#include <qmath.h> | ||||
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r1717 | |||
static int label_padding = 5; | ||||
QTCOMMERCIALCHART_BEGIN_NAMESPACE | ||||
ChartDateTimeAxisX::ChartDateTimeAxisX(QAbstractAxis *axis,ChartPresenter *presenter) : ChartAxis(axis,presenter), | ||||
m_tickCount(0) | ||||
{ | ||||
} | ||||
ChartDateTimeAxisX::~ChartDateTimeAxisX() | ||||
{ | ||||
} | ||||
void ChartDateTimeAxisX::createLabels(QStringList &labels,qreal min, qreal max, int ticks) | ||||
{ | ||||
Q_ASSERT(max>min); | ||||
Q_ASSERT(ticks>1); | ||||
QDateTimeAxis *axis = qobject_cast<QDateTimeAxis *>(m_chartAxis); | ||||
int n = qMax(int(-floor(log10((max-min)/(ticks-1)))),0); | ||||
n++; | ||||
for (int i=0; i< ticks; i++) { | ||||
qreal value = min + (i * (max - min)/ (ticks-1)); | ||||
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r1801 | labels << QDateTime::fromMSecsSinceEpoch(value).toString(axis->format()); | ||
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r1717 | } | ||
} | ||||
QVector<qreal> ChartDateTimeAxisX::calculateLayout() const | ||||
{ | ||||
Q_ASSERT(m_tickCount>=2); | ||||
QVector<qreal> points; | ||||
points.resize(m_tickCount); | ||||
const qreal deltaX = m_rect.width()/(m_tickCount-1); | ||||
for (int i = 0; i < m_tickCount; ++i) { | ||||
int x = i * deltaX + m_rect.left(); | ||||
points[i] = x; | ||||
} | ||||
return points; | ||||
} | ||||
void ChartDateTimeAxisX::updateGeometry() | ||||
{ | ||||
const QVector<qreal>& layout = ChartAxis::layout(); | ||||
m_minWidth = 0; | ||||
m_minHeight = 0; | ||||
if(layout.isEmpty()) return; | ||||
QStringList ticksList; | ||||
createLabels(ticksList,m_min,m_max,layout.size()); | ||||
QList<QGraphicsItem *> lines = m_grid->childItems(); | ||||
QList<QGraphicsItem *> labels = m_labels->childItems(); | ||||
QList<QGraphicsItem *> shades = m_shades->childItems(); | ||||
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r1729 | QList<QGraphicsItem *> axis = m_arrow->childItems(); | ||
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r1717 | |||
Q_ASSERT(labels.size() == ticksList.size()); | ||||
Q_ASSERT(layout.size() == ticksList.size()); | ||||
QGraphicsLineItem *lineItem = static_cast<QGraphicsLineItem*>(axis.at(0)); | ||||
lineItem->setLine(m_rect.left(), m_rect.bottom(), m_rect.right(), m_rect.bottom()); | ||||
qreal width = 0; | ||||
for (int i = 0; i < layout.size(); ++i) { | ||||
QGraphicsLineItem *lineItem = static_cast<QGraphicsLineItem*>(lines.at(i)); | ||||
lineItem->setLine(layout[i], m_rect.top(), layout[i], m_rect.bottom()); | ||||
QGraphicsSimpleTextItem *labelItem = static_cast<QGraphicsSimpleTextItem*>(labels.at(i)); | ||||
labelItem->setText(ticksList.at(i)); | ||||
const QRectF& rect = labelItem->boundingRect(); | ||||
QPointF center = rect.center(); | ||||
labelItem->setTransformOriginPoint(center.x(), center.y()); | ||||
labelItem->setPos(layout[i] - center.x(), m_rect.bottom() + label_padding); | ||||
if(labelItem->pos().x()<=width){ | ||||
labelItem->setVisible(false); | ||||
lineItem->setVisible(false); | ||||
}else{ | ||||
labelItem->setVisible(true); | ||||
lineItem->setVisible(true); | ||||
width=rect.width()+labelItem->pos().x(); | ||||
} | ||||
m_minWidth+=rect.width(); | ||||
m_minHeight=qMax(rect.height(),m_minHeight); | ||||
if ((i+1)%2 && i>1) { | ||||
QGraphicsRectItem *rectItem = static_cast<QGraphicsRectItem*>(shades.at(i/2-1)); | ||||
rectItem->setRect(layout[i-1],m_rect.top(),layout[i]-layout[i-1],m_rect.height()); | ||||
} | ||||
lineItem = static_cast<QGraphicsLineItem*>(axis.at(i+1)); | ||||
lineItem->setLine(layout[i],m_rect.bottom(),layout[i],m_rect.bottom()+5); | ||||
} | ||||
} | ||||
void ChartDateTimeAxisX::handleAxisUpdated() | ||||
{ | ||||
//TODO:: fix this | ||||
QDateTimeAxis* axis = qobject_cast<QDateTimeAxis*>(m_chartAxis); | ||||
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r1801 | m_tickCount = axis->tickCount(); | ||
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r1717 | ChartAxis::handleAxisUpdated(); | ||
} | ||||
QTCOMMERCIALCHART_END_NAMESPACE | ||||