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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):XYChartItem(series,parent),
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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(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::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 LineChartItem::setGeometry(QVector<QPointF>& points)
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{
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if(points.size()==0) return;
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int diff = XYChartItem::points().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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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(!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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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(!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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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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XYChartItem::setGeometry(points);
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}
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void LineChartItem::setLinePen(const QPen& pen)
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{
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m_pen = pen;
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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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setLinePen(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(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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