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#include "xychartitem_p.h"
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#include "qxyseries.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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XYChartItem::XYChartItem(QXYSeries* 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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{
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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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}
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QPointF XYChartItem::calculateGeometryPoint(const QPointF& point) 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 = (point.x() - m_minX)* deltaX;
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qreal y = (point.y() - m_minY)*-deltaY + m_size.height();
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return QPointF(x,y);
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}
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QPointF XYChartItem::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> XYChartItem::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 XYChartItem::updatePoints(QVector<QPointF>& points)
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{
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setGeometry(points);
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}
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void XYChartItem::updatePoint(QVector<QPointF>& points)
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{
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setGeometry(points);
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}
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void XYChartItem::setGeometry(QVector<QPointF>& points)
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{
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m_points = points;
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}
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//handlers
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void XYChartItem::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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QVector<QPointF> points = m_points;
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points.insert(index,point);
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updatePoints(points);
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update();
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}
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void XYChartItem::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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QVector<QPointF> points = m_points;
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points.remove(index);
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updatePoints(points);
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update();
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}
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void XYChartItem::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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QVector<QPointF> points = m_points;
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m_points.replace(index,point);
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updatePoint(points);
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update();
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}
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void XYChartItem::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(isEmpty()) return;
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QVector<QPointF> points = calculateGeometryPoints();
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updatePoints(points);
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update();
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}
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void XYChartItem::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(isEmpty()) return;
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QVector<QPointF> points = calculateGeometryPoints();
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updatePoints(points);
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update();
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}
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bool XYChartItem::isEmpty()
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{
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return !m_clipRect.isValid() || m_maxX - m_minX == 0 || m_maxY - m_minY ==0 ;
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}
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#include "moc_xychartitem_p.cpp"
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QTCOMMERCIALCHART_END_NAMESPACE
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