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#include "ChartDataLine.h"
#include "ChartScene.h"
#include "ChartMarker.h"
const QColor ChartDataLine::MarkerColor(Qt::blue);
const QColor ChartDataLine::FillColor(0, 0, 255, 128);
ChartDataLine::ChartDataLine(ChartScene* scene):
scene(scene),
origin(getDataSetOrigin()),
xSpacing(scene->getXTickSpacing())
{
}
QPointF ChartDataLine::getDataSetOrigin() const
{
QSizeF padding = scene->DataSetPadding;
QPointF res = scene->getChartOrigin();
res.ry() -= padding.height();
if(scene->getDataDirection() == 1)
res.rx() += padding.width();
else
res.rx() += scene->getChartRect().width();
return res;
}
void ChartDataLine::paint()
{
QPainterPath linePath = createLinePath();
addLinePath(linePath);
addAreaPath(linePath);
}
QPainterPath ChartDataLine::createLinePath()
{
QList<DataPoint> dataSet = scene->getDataSet();
QPointF firstPoint = getDataPos(0, dataSet.first().value);
QPainterPath linePath(firstPoint);
for (int i = 0; i < dataSet.size(); i++)
addLineSegment(linePath, i);
return linePath;
}
void ChartDataLine::addLineSegment(QPainterPath& path, int i)
{
DataPoint dataPoint = scene->getDataSet().at(i);
QPointF pos = getDataPos(i, dataPoint.value);
QString toolTipText = createToolTipText(dataPoint);
scene->addItem(new ChartMarker(pos, toolTipText));
path.lineTo(pos);
}
QPointF ChartDataLine::getDataPos(int index, int yValue)
{
qreal xPos = scene->getDataDirection() * index * xSpacing;
qreal yPos = scene->getYPosFromValue(yValue - scene->getMinY());
return origin + QPointF(xPos, -yPos);
}
QString ChartDataLine::createToolTipText(const DataPoint& dataPoint) const
{
return scene->getXLabel() + ": <b>" + dataPoint.toolTipLabel + "</b><br/>" +
scene->getYLabel() + ": <b>" + QString::number(dataPoint.value) + "</b>";
}
void ChartDataLine::addLinePath(const QPainterPath& path)
{
QPen pen(MarkerColor);
pen.setWidth(2);
scene->addPath(path, pen);
}
void ChartDataLine::addAreaPath(const QPainterPath& linePath)
{
QPainterPath areaPath(origin);
areaPath.lineTo(QPointF(linePath.elementAt(0)));
areaPath.connectPath(linePath);
areaPath.lineTo(QPointF(linePath.currentPosition().x(), origin.y()));
scene->addPath(areaPath, QPen(FillColor), QBrush(FillColor));
}
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