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/****************************************************************************
**
** Copyright (C) 2013 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 "abstractdomain_p.h"
#include <QPainter>
#include <QGraphicsSceneMouseEvent>
QTCOMMERCIALCHART_BEGIN_NAMESPACE
const qreal mouseEventMinWidth(12);
LineChartItem::LineChartItem(QLineSeries *series,QGraphicsItem* item)
: XYChart(series,item),
m_series(series),
m_pointsVisible(false)
{
setAcceptHoverEvents(true);
setZValue(ChartPresenter::LineChartZValue);
QObject::connect(series->d_func(), SIGNAL(updated()), this, SLOT(handleUpdated()));
QObject::connect(series, SIGNAL(visibleChanged()), this, SLOT(handleUpdated()));
QObject::connect(series, SIGNAL(opacityChanged()), this, SLOT(handleUpdated()));
handleUpdated();
}
QRectF LineChartItem::boundingRect() const
{
return m_rect;
}
QPainterPath LineChartItem::shape() const
{
return m_path;
}
void LineChartItem::updateGeometry()
{
m_points = geometryPoints();
if (m_points.size() == 0) {
prepareGeometryChange();
m_path = QPainterPath();
m_linePath = QPainterPath();
m_rect = QRect();
return;
}
QPainterPath linePath(m_points.at(0));
if (m_pointsVisible) {
int size = m_linePen.width();
linePath.addEllipse(m_points.at(0), size, size);
linePath.moveTo(m_points.at(0));
for (int i = 1; i < m_points.size(); i++) {
linePath.lineTo(m_points.at(i));
linePath.addEllipse(m_points.at(i), size, size);
linePath.moveTo(m_points.at(i));
}
} else {
for (int i = 1; i < m_points.size(); i++)
linePath.lineTo(m_points.at(i));
}
m_linePath = linePath;
QPainterPathStroker stroker;
// QPainter::drawLine does not respect join styles, for example BevelJoin becomes MiterJoin.
// This is why we are prepared for the "worst case" scenario, i.e. use always MiterJoin and
// multiply line width with square root of two when defining shape and bounding rectangle.
stroker.setWidth(m_linePen.width() * 1.42);
stroker.setJoinStyle(Qt::MiterJoin);
stroker.setCapStyle(Qt::SquareCap);
stroker.setMiterLimit(m_linePen.miterLimit());
prepareGeometryChange();
m_path = stroker.createStroke(linePath);
m_rect = m_path.boundingRect();
}
void LineChartItem::handleUpdated()
{
// If points visiblity has changed, a geometry update is needed.
// Also, if pen changes when points are visible, geometry update is needed.
bool doGeometryUpdate =
(m_pointsVisible != m_series->pointsVisible())
|| (m_series->pointsVisible() && (m_linePen != m_series->pen()));
setVisible(m_series->isVisible());
setOpacity(m_series->opacity());
m_pointsVisible = m_series->pointsVisible();
m_linePen = m_series->pen();
if (doGeometryUpdate)
updateGeometry();
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(QRectF(QPointF(0,0),domain()->size()));
if (m_pointsVisible) {
painter->setBrush(m_linePen.color());
painter->drawPath(m_linePath);
} else {
painter->setBrush(QBrush(Qt::NoBrush));
if (m_linePen.style() != Qt::SolidLine) {
// If pen style is not solid line, always fall back to path painting
// to ensure proper continuity of the pattern
painter->drawPath(m_linePath);
} else {
for (int i(1); i < m_points.size(); i++)
painter->drawLine(m_points.at(i - 1), m_points.at(i));
}
}
painter->restore();
}
void LineChartItem::mousePressEvent(QGraphicsSceneMouseEvent *event)
{
emit XYChart::clicked(domain()->calculateDomainPoint(event->pos()));
QGraphicsItem::mousePressEvent(event);
}
void LineChartItem::hoverEnterEvent(QGraphicsSceneHoverEvent *event)
{
emit XYChart::hovered(domain()->calculateDomainPoint(event->pos()), true);
// event->accept();
QGraphicsItem::hoverEnterEvent(event);
}
void LineChartItem::hoverLeaveEvent(QGraphicsSceneHoverEvent *event)
{
emit XYChart::hovered(domain()->calculateDomainPoint(event->pos()), false);
// event->accept();
QGraphicsItem::hoverEnterEvent(event);
}
#include "moc_linechartitem_p.cpp"
QTCOMMERCIALCHART_END_NAMESPACE
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