##// END OF EJS Templates
QBarCategoriesAxis renamed to QBarCategoryAxis
QBarCategoriesAxis renamed to QBarCategoryAxis

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linechartitem.cpp
132 lines | 3.8 KiB | text/x-c | CppLexer
/****************************************************************************
**
** 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 "linechartitem_p.h"
#include "qlineseries.h"
#include "qlineseries_p.h"
#include "chartpresenter_p.h"
#include <QPainter>
#include <QGraphicsSceneMouseEvent>
QTCOMMERCIALCHART_BEGIN_NAMESPACE
const qreal mouseEventMinWidth(12);
LineChartItem::LineChartItem(QLineSeries* series,ChartPresenter *presenter):
XYChart(series, presenter),
QGraphicsItem(presenter ? presenter->rootItem() : 0),
m_series(series),
m_pointsVisible(false)
{
setZValue(ChartPresenter::LineChartZValue);
QObject::connect(series->d_func(),SIGNAL(updated()),this,SLOT(handleUpdated()));
QObject::connect(series, SIGNAL(visibleChanged()), this, SLOT(handleUpdated()));
handleUpdated();
}
QRectF LineChartItem::boundingRect() const
{
return m_rect;
}
QPainterPath LineChartItem::shape() const
{
// Increase the size of the path slightly to make mouse interactions more natural
QPainterPathStroker s;
s.setCapStyle(Qt::RoundCap);
s.setJoinStyle(Qt::RoundJoin);
qreal spacing = qMax(mouseEventMinWidth, (qreal) m_linePen.width());
s.setWidth(spacing);
return s.createStroke(m_path);
}
void LineChartItem::updateGeometry()
{
const QVector<QPointF>& points = geometryPoints();
if(points.size()==0)
{
prepareGeometryChange();
m_path = QPainterPath();
m_rect = QRect();
return;
}
QPainterPath linePath(points.at(0));
for(int i=1; i< points.size();i++) {
linePath.lineTo(points.at(i));
}
prepareGeometryChange();
m_path = linePath;
// When defining bounding rectangle,
// 1. take the line width into account (otherwise you will get drawing artifacts) and
// 2. take the shape into account (otherwise you will not get mouse events through on border
// areas).
const qreal sqrtOf2 = 1.414214;
const qreal spacing = qMax(mouseEventMinWidth / 2.0,
sqrtOf2 * (qreal) m_linePen.width() / 2.0);
m_rect = m_path.boundingRect().adjusted(-spacing, -spacing, spacing, spacing);
setPos(origin());
}
void LineChartItem::handleUpdated()
{
setVisible(m_series->isVisible());
m_pointsVisible = m_series->pointsVisible();
m_linePen = m_series->pen();
m_pointPen = m_series->pen();
m_pointPen.setWidthF(2*m_pointPen.width());
update();
}
void LineChartItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{
Q_UNUSED(widget)
Q_UNUSED(option)
painter->save();
painter->setPen(m_linePen);
painter->setClipRect(clipRect());
// Draw lines
const QVector<QPointF> &points = geometryPoints();
for (int i(1); i < points.size();i++)
painter->drawLine(points.at(i-1), points.at(i));
// Draw points
if (m_pointsVisible){
painter->setPen(m_pointPen);
painter->drawPoints(geometryPoints());
}
painter->restore();
}
void LineChartItem::mousePressEvent(QGraphicsSceneMouseEvent *event)
{
emit XYChart::clicked(calculateDomainPoint(event->pos()));
QGraphicsItem::mousePressEvent(event);
}
#include "moc_linechartitem_p.cpp"
QTCOMMERCIALCHART_END_NAMESPACE