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/****************************************************************************
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**
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** Copyright (C) 2012 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 <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,ChartPresenter *presenter):
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XYChart(series, presenter),
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QGraphicsItem(presenter ? presenter->rootItem() : 0),
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m_series(series),
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m_pointsVisible(false)
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{
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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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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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// Increase the size of the path slightly to make mouse interactions more natural
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QPainterPathStroker s;
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s.setCapStyle(Qt::RoundCap);
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s.setJoinStyle(Qt::RoundJoin);
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qreal spacing = qMax(mouseEventMinWidth, (qreal) m_linePen.width());
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s.setWidth(spacing);
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return s.createStroke(m_path);
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}
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void LineChartItem::updateGeometry()
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{
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const QVector<QPointF>& points = geometryPoints();
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if(points.size()==0)
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{
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prepareGeometryChange();
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m_path = QPainterPath();
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m_rect = QRect();
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return;
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}
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QPainterPath linePath(points.at(0));
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for(int i=1; i< points.size();i++) {
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linePath.lineTo(points.at(i));
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}
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prepareGeometryChange();
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m_path = linePath;
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// When defining bounding rectangle,
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// 1. take the line width into account (otherwise you will get drawing artifacts) and
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// 2. take the shape into account (otherwise you will not get mouse events through on border
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// areas).
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const qreal sqrtOf2 = 1.414214;
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const qreal spacing = qMax(mouseEventMinWidth / 2.0,
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sqrtOf2 * (qreal) m_linePen.width() / 2.0);
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m_rect = m_path.boundingRect().adjusted(-spacing, -spacing, spacing, spacing);
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setPos(origin());
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}
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void LineChartItem::handleUpdated()
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{
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setVisible(m_series->isVisible());
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m_pointsVisible = m_series->pointsVisible();
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m_linePen = m_series->pen();
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m_pointPen = m_series->pen();
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m_pointPen.setWidthF(2*m_pointPen.width());
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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->setClipRect(clipRect());
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// Draw lines
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const QVector<QPointF> &points = geometryPoints();
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for (int i(1); i < points.size();i++)
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painter->drawLine(points.at(i-1), points.at(i));
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// Draw points
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if (m_pointsVisible){
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painter->setPen(m_pointPen);
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painter->drawPoints(geometryPoints());
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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(calculateDomainPoint(event->pos()));
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QGraphicsItem::mousePressEvent(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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