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#include "linechartitem_p.h"
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#include "qlineseries.h"
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#include "chartpresenter_p.h"
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#include <QPainter>
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QTCOMMERCIALCHART_BEGIN_NAMESPACE
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//TODO: optimize : remove points which are not visible
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LineChartItem::LineChartItem(QLineSeries* series,QGraphicsItem *parent):ChartItem(parent),
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m_minX(0),
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m_maxX(0),
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m_minY(0),
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m_maxY(0),
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m_series(series),
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m_items(this)
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{
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//m_items.setZValue(ChartPresenter::LineChartZValue);
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setZValue(ChartPresenter::LineChartZValue);
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QObject::connect(series,SIGNAL(pointReplaced(int)),this,SLOT(handlePointReplaced(int)));
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QObject::connect(series,SIGNAL(pointAdded(int)),this,SLOT(handlePointAdded(int)));
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QObject::connect(series,SIGNAL(pointRemoved(int)),this,SLOT(handlePointRemoved(int)));
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QObject::connect(series,SIGNAL(updated()),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::createPoints(int count)
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{
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for (int i = 0; i < count; ++i) {
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QGraphicsRectItem* item = new QGraphicsRectItem(0,0,3,3);
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m_items.addToGroup(item);
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}
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}
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void LineChartItem::clearPoints(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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QPointF LineChartItem::calculateGeometryPoint(int index) const
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{
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const qreal deltaX = m_size.width()/(m_maxX-m_minX);
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const qreal deltaY = m_size.height()/(m_maxY-m_minY);
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qreal x = (m_series->x(index) - m_minX)* deltaX;
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qreal y = (m_series->y(index) - m_minY)*-deltaY + m_size.height();
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return QPointF(x,y);
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}
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QVector<QPointF> LineChartItem::calculateGeometryPoints() const
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{
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const qreal deltaX = m_size.width()/(m_maxX-m_minX);
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const qreal deltaY = m_size.height()/(m_maxY-m_minY);
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QVector<QPointF> points;
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points.reserve(m_series->count());
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for (int i = 0; i < m_series->count(); ++i) {
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qreal x = (m_series->x(i) - m_minX)* deltaX;
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qreal y = (m_series->y(i) - m_minY)*-deltaY + m_size.height();
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points << QPointF(x,y);
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}
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return points;
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}
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void LineChartItem::updateItem(QVector<QPointF>& oldPoints,QVector<QPointF>& newPoints)
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{
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applyGeometry(newPoints);
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oldPoints = newPoints;
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}
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void LineChartItem::updateItem(QVector<QPointF>& oldPoints,int index,QPointF& newPoint)
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{
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oldPoints.replace(index,newPoint);
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applyGeometry(oldPoints);
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}
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void LineChartItem::applyGeometry(QVector<QPointF>& points)
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{
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if(points.size()==0) return;
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QList<QGraphicsItem*> items = m_items.childItems();
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QPainterPath path;
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const QPointF& point = points.at(0);
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path.moveTo(point);
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QGraphicsItem* item = items.at(0);
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item->setPos(point.x()-1,point.y()-1);
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if(!m_clipRect.contains(point)) {
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item->setVisible(false);
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}else{
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item->setVisible(true);
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}
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for(int i=1 ; i< points.size();i++) {
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QGraphicsItem* item = items.at(i);
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const QPointF& point = points.at(i);
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item->setPos(point.x()-1,point.y()-1);
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if(!m_clipRect.contains(point)) {
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item->setVisible(false);
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}else{
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item->setVisible(true);
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}
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path.lineTo(point);
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}
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prepareGeometryChange();
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m_path = path;
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m_rect = path.boundingRect();
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}
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void LineChartItem::setPen(const QPen& pen)
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{
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m_pen = pen;
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}
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//handlers
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void LineChartItem::handlePointAdded(int index)
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{
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Q_ASSERT(index<m_series->count());
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Q_ASSERT(index>=0);
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QPointF point = calculateGeometryPoint(index);
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createPoints(1);
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QVector<QPointF> points = m_points;
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points.insert(index,point);
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updateItem(m_points,points);
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update();
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}
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void LineChartItem::handlePointRemoved(int index)
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{
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Q_ASSERT(index<m_series->count());
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Q_ASSERT(index>=0);
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QPointF point = calculateGeometryPoint(index);
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clearPoints(1);
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QVector<QPointF> points = m_points;
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points.remove(index);
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updateItem(m_points,points);
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update();
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}
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void LineChartItem::handlePointReplaced(int index)
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{
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Q_ASSERT(index<m_series->count());
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Q_ASSERT(index>=0);
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QPointF point = calculateGeometryPoint(index);
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updateItem(m_points,index,point);
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update();
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}
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void LineChartItem::handleDomainChanged(qreal minX, qreal maxX, qreal minY, qreal maxY)
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{
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m_minX=minX;
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m_maxX=maxX;
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m_minY=minY;
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m_maxY=maxY;
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if( (m_maxX - m_minX) == 0|| (m_maxY - m_minY) == 0) return;
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if(!m_clipRect.isValid()) return;
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QVector<QPointF> points = calculateGeometryPoints();
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int diff = m_points.size() - points.size();
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if(diff>0) {
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clearPoints(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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updateItem(m_points,points);
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update();
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}
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void LineChartItem::handleGeometryChanged(const QRectF& rect)
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{
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Q_ASSERT(rect.isValid());
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m_size=rect.size();
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m_clipRect=rect.translated(-rect.topLeft());
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setPos(rect.topLeft());
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if( (m_maxX - m_minX) == 0|| (m_maxY - m_minY) == 0) return;
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QVector<QPointF> points = calculateGeometryPoints();
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int diff = m_points.size() - points.size();
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if(diff>0) {
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clearPoints(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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updateItem(m_points,points);
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update();
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}
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void LineChartItem::handleUpdated()
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{
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m_items.setVisible(m_series->pointsVisible());
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setPen(m_series->pen());
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update();
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}
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//painter
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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_pen);
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painter->setClipRect(m_clipRect);
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painter->drawPath(m_path);
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painter->restore();
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}
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#include "moc_linechartitem_p.cpp"
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QTCOMMERCIALCHART_END_NAMESPACE
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