void GraphWidget::drawChart()
{
XYChart *c = new XYChart(size.width(), size.height() - 100, Chart::Transparent);
c->setPlotArea(10, 50, c->getWidth() - 65, c->getHeight() - 10, 0x000000, -1, 0xC8C8C8, Chart::Transparent, Chart::Transparent);
c->setClipping();
c->getLegend()->setLineStyleKey();
c->getLegend()->setFontSize(10);
//遍历查询结果并绘制结果
int ea_result_count = ea_results.size();
//设置X轴的label
for(int i = 0;i < ea_result_count;i++){
ExchangeRateResult *ea_result = ea_results[i];
DoubleArray x_data = getXData(i);
DoubleArray y_data = ea_result->getYData();
double viewPortStartDate = m_ChartViewer->getValueAtViewPort("x", m_ChartViewer->getViewPortLeft());
double viewPortEndDate = m_ChartViewer->getValueAtViewPort("x", m_ChartViewer->getViewPortLeft() +
m_ChartViewer->getViewPortWidth());
int startIndex = (int)floor(Chart::bSearch(x_data, viewPortStartDate));
int endIndex = (int)ceil(Chart::bSearch(x_data, viewPortEndDate));
int noOfPoints = endIndex - startIndex + 1;
DoubleArray viewPortXData = DoubleArray(x_data.data + startIndex, noOfPoints);
DoubleArray viewPortYData = DoubleArray(y_data.data + startIndex, noOfPoints);
//添加图层
LineLayer *layer = c->addLineLayer();
layer->setLineWidth(1);
//设置X轴
layer->setXData(viewPortXData);
//设置Y轴
layer->addDataSet(viewPortYData, ea_result->getColor(), ea_result->getName().toUtf8().data())->setUseYAxis2();
}
c->xAxis()->setLabelStyle("arial.ttf", 10);
c->yAxis2()->setLabelStyle("arial.ttf", 10);
c->xAxis()->setColors(0xC8C8C8, 0xC8C8C8);
c->yAxis2()->setColors(0xC8C8C8, 0xC8C8C8);
m_ChartViewer->syncDateAxisWithViewPort("x", c->xAxis());
c->yAxis()->setTickDensity(30);
c->yAxis2()->setTickDensity(30);
if (!m_ChartViewer->isInMouseMoveEvent())
{
trackLineLegend(c, (0 == m_ChartViewer->getChart()) ? c->getPlotArea()->getRightX() :
m_ChartViewer->getPlotAreaMouseX());
}
delete m_ChartViewer->getChart();
m_ChartViewer->setChart(c);
}
