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#include "xylinechartitem_p.h"
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#include "axisitem_p.h"
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#include "qxychartseries.h"
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#include <QPainter>
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#include <QStyleOptionGraphicsItem>
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#include <QDebug>
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QTCOMMERCIALCHART_BEGIN_NAMESPACE
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XYLineChartItem::XYLineChartItem(QXYChartSeries* series,QGraphicsItem *parent):ChartItem(parent),
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m_series(series),
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m_dirty(false)
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{
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}
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void XYLineChartItem::setSize(const QSize& size)
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{
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m_rect=QRect(0,0,size.width(),size.height());
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m_dirty=true;
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}
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void XYLineChartItem::setPlotDomain(const PlotDomain& data)
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{
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m_plotDomain=data;
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m_dirty=true;
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}
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QRectF XYLineChartItem::boundingRect() const
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{
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return m_polyline.boundingRect();
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}
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void XYLineChartItem::updateGeometry()
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{
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if (!m_rect.isValid()) return;
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const qreal deltaX = (m_rect.width()-1)/m_plotDomain.spanX();
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const qreal deltaY = (m_rect.height()-1)/m_plotDomain.spanY();
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m_polyline.clear();
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m_polyline.resize(m_series->count());
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for (int j = 0; j < m_series->count(); ++j) {
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qreal dx = m_series->x(j) - m_plotDomain.m_minX;
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qreal dy = m_series->y(j) - m_plotDomain.m_minY;
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qreal x = (dx * deltaX) + m_rect.left();
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qreal y = - (dy * deltaY) + m_rect.bottom();
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m_polyline[j] = QPointF(x, y);
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}
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}
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void XYLineChartItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option,QWidget *widget)
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{
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//TODO: remove it
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if (m_dirty) {
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updateGeometry();
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m_dirty=false;
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}
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painter->setClipRect(m_rect.adjusted(+1, +1, -1, -1));
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painter->setPen(m_series->color());
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painter->drawPolyline(m_polyline);
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}
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QTCOMMERCIALCHART_END_NAMESPACE
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