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/****************************************************************************
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**
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** Copyright (C) 2013 Digia Plc
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** All rights reserved.
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** For any questions to Digia, please use contact form at http://qt.digia.com
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**
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** This file is part of the Qt Commercial Charts Add-on.
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**
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** $QT_BEGIN_LICENSE$
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** Licensees holding valid Qt Commercial licenses may use this file in
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** accordance with the Qt Commercial License Agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and Digia.
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**
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** If you have questions regarding the use of this file, please use
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** contact form at http://qt.digia.com
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "linechartitem_p.h"
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#include "qlineseries.h"
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#include "qlineseries_p.h"
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#include "chartpresenter_p.h"
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#include "abstractdomain_p.h"
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#include <QPainter>
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#include <QGraphicsSceneMouseEvent>
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QTCOMMERCIALCHART_BEGIN_NAMESPACE
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const qreal mouseEventMinWidth(12);
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LineChartItem::LineChartItem(QLineSeries *series,QGraphicsItem* item)
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: XYChart(series,item),
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m_series(series),
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m_pointsVisible(false)
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{
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setAcceptHoverEvents(true);
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setZValue(ChartPresenter::LineChartZValue);
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QObject::connect(series->d_func(), SIGNAL(updated()), this, SLOT(handleUpdated()));
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QObject::connect(series, SIGNAL(visibleChanged()), this, SLOT(handleUpdated()));
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QObject::connect(series, SIGNAL(opacityChanged()), this, SLOT(handleUpdated()));
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handleUpdated();
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}
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QRectF LineChartItem::boundingRect() const
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{
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return m_rect;
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}
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QPainterPath LineChartItem::shape() const
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{
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return m_path;
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}
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void LineChartItem::updateGeometry()
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{
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m_points = geometryPoints();
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if (m_points.size() == 0) {
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prepareGeometryChange();
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m_path = QPainterPath();
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m_linePath = QPainterPath();
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m_rect = QRect();
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return;
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}
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QPainterPath linePath(m_points.at(0));
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if (m_pointsVisible) {
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int size = m_linePen.width();
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linePath.addEllipse(m_points.at(0), size, size);
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linePath.moveTo(m_points.at(0));
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for (int i = 1; i < m_points.size(); i++) {
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linePath.lineTo(m_points.at(i));
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linePath.addEllipse(m_points.at(i), size, size);
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linePath.moveTo(m_points.at(i));
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}
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} else {
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for (int i = 1; i < m_points.size(); i++)
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linePath.lineTo(m_points.at(i));
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}
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m_linePath = linePath;
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QPainterPathStroker stroker;
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// QPainter::drawLine does not respect join styles, for example BevelJoin becomes MiterJoin.
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// This is why we are prepared for the "worst case" scenario, i.e. use always MiterJoin and
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// multiply line width with square root of two when defining shape and bounding rectangle.
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stroker.setWidth(m_linePen.width() * 1.42);
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stroker.setJoinStyle(Qt::MiterJoin);
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stroker.setCapStyle(Qt::SquareCap);
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stroker.setMiterLimit(m_linePen.miterLimit());
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prepareGeometryChange();
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m_path = stroker.createStroke(linePath);
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m_rect = m_path.boundingRect();
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}
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void LineChartItem::handleUpdated()
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{
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// If points visiblity has changed, a geometry update is needed.
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// Also, if pen changes when points are visible, geometry update is needed.
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bool doGeometryUpdate =
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(m_pointsVisible != m_series->pointsVisible())
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|| (m_series->pointsVisible() && (m_linePen != m_series->pen()));
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setVisible(m_series->isVisible());
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setOpacity(m_series->opacity());
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m_pointsVisible = m_series->pointsVisible();
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m_linePen = m_series->pen();
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if (doGeometryUpdate)
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updateGeometry();
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update();
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}
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void LineChartItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
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{
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Q_UNUSED(widget)
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Q_UNUSED(option)
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painter->save();
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painter->setPen(m_linePen);
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painter->setBrush(m_linePen.color());
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painter->setClipRect(QRectF(QPointF(0,0),domain()->size()));
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if (m_pointsVisible) {
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painter->drawPath(m_linePath);
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} else {
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for (int i(1); i < m_points.size(); i++)
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painter->drawLine(m_points.at(i - 1), m_points.at(i));
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}
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painter->restore();
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}
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void LineChartItem::mousePressEvent(QGraphicsSceneMouseEvent *event)
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{
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emit XYChart::clicked(domain()->calculateDomainPoint(event->pos()));
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QGraphicsItem::mousePressEvent(event);
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}
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void LineChartItem::hoverEnterEvent(QGraphicsSceneHoverEvent *event)
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{
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emit XYChart::hovered(domain()->calculateDomainPoint(event->pos()), true);
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// event->accept();
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QGraphicsItem::hoverEnterEvent(event);
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}
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void LineChartItem::hoverLeaveEvent(QGraphicsSceneHoverEvent *event)
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{
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emit XYChart::hovered(domain()->calculateDomainPoint(event->pos()), false);
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// event->accept();
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QGraphicsItem::hoverEnterEvent(event);
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}
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#include "moc_linechartitem_p.cpp"
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QTCOMMERCIALCHART_END_NAMESPACE
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