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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 "scatterchartitem_p.h"
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#include "qscatterseries.h"
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#include "qscatterseries_p.h"
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#include "chartpresenter_p.h"
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#include <QPainter>
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#include <QGraphicsScene>
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#include <QDebug>
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#include <QGraphicsSceneMouseEvent>
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QTCOMMERCIALCHART_BEGIN_NAMESPACE
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ScatterChartItem::ScatterChartItem(QScatterSeries *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_items(this),
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m_visible(true),
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m_shape(QScatterSeries::MarkerShapeRectangle),
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m_size(15)
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{
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QObject::connect(m_series->d_func(),SIGNAL(updated()), this, SLOT(handleUpdated()));
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QObject::connect(m_series, SIGNAL(visibleChanged()), this, SLOT(handleUpdated()));
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setZValue(ChartPresenter::ScatterSeriesZValue);
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setFlags(QGraphicsItem::ItemClipsChildrenToShape);
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handleUpdated();
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m_items.setHandlesChildEvents(false);
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// TODO: how to draw a drop shadow?
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// QGraphicsDropShadowEffect *dropShadow = new QGraphicsDropShadowEffect();
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// dropShadow->setOffset(2.0);
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// dropShadow->setBlurRadius(2.0);
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// setGraphicsEffect(dropShadow);
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}
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QRectF ScatterChartItem::boundingRect() const
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{
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return m_rect;
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}
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void ScatterChartItem::createPoints(int count)
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{
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for (int i = 0; i < count; ++i) {
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QGraphicsItem *item = 0;
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switch (m_shape) {
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case QScatterSeries::MarkerShapeCircle: {
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QGraphicsEllipseItem* i = new QGraphicsEllipseItem(0,0,m_size,m_size,this);
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const QRectF& rect = i->boundingRect();
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i->setPos(-rect.width()/2,-rect.height()/2);
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item = new Marker(i,this);
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break;
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}
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case QScatterSeries::MarkerShapeRectangle: {
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QGraphicsRectItem* i = new QGraphicsRectItem(0,0,m_size,m_size,this);
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i->setPos(-m_size/2,-m_size/2);
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item = new Marker(i,this);
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break;
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}
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default:
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qWarning()<<"Unsupported marker type";
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break;
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}
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m_items.addToGroup(item);
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}
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}
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void ScatterChartItem::deletePoints(int count)
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{
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QList<QGraphicsItem *> items = m_items.childItems();
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for (int i = 0; i < count; ++i) {
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delete(items.takeLast());
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}
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}
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void ScatterChartItem::markerSelected(Marker *marker)
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{
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emit XYChart::clicked(calculateDomainPoint(marker->point()));
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}
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void ScatterChartItem::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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deletePoints(m_items.childItems().count());
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return;
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}
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int diff = m_items.childItems().size() - points.size();
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if(diff>0) {
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deletePoints(diff);
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}
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else if(diff<0) {
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createPoints(-diff);
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}
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if(diff!=0) handleUpdated();
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QList<QGraphicsItem*> items = m_items.childItems();
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for (int i = 0; i < points.size(); i++) {
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Marker* item = static_cast<Marker*>(items.at(i));
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const QPointF& point = points.at(i);
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const QRectF& rect = item->boundingRect();
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item->setPoint(point);
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item->setPos(point.x()-rect.width()/2,point.y()-rect.height()/2);
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if(!m_visible || !clipRect().contains(point)) {
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item->setVisible(false);
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}
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else {
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item->setVisible(true);
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}
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}
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prepareGeometryChange();
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m_rect = clipRect();
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setPos(origin());
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}
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void ScatterChartItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
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{
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Q_UNUSED(painter)
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Q_UNUSED(option)
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Q_UNUSED(widget)
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}
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void ScatterChartItem::setPen(const QPen& pen)
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{
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foreach(QGraphicsItem* item , m_items.childItems()) {
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static_cast<Marker*>(item)->setPen(pen);
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}
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}
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void ScatterChartItem::setBrush(const QBrush& brush)
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{
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foreach(QGraphicsItem* item , m_items.childItems()) {
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static_cast<Marker*>(item)->setBrush(brush);
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}
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}
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void ScatterChartItem::handleUpdated()
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{
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int count = m_items.childItems().count();
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if(count==0) return;
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bool recreate = m_visible != m_series->isVisible()
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|| m_size != m_series->markerSize()
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|| m_shape != m_series->markerShape();
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m_visible = m_series->isVisible();
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m_size = m_series->markerSize();
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m_shape = m_series->markerShape();
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if(recreate) {
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// TODO: optimize handleUpdate to recreate points only in case shape changed
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deletePoints(count);
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createPoints(count);
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// Updating geometry is now safe, because it won't call handleUpdated unless it creates/deletes points
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updateGeometry();
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}
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setPen(m_series->pen());
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setBrush(m_series->brush());
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update();
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}
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void ScatterChartItem::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_scatterchartitem_p.cpp"
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QTCOMMERCIALCHART_END_NAMESPACE
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