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);
}
int main(int argc, char *argv[])
{
// The x and y coordinates of the grid
double dataX[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
double dataY[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
// Use random numbers for the z values on the XY grid
RanSeries *r = new RanSeries(999);
DoubleArray dataZ = r->get2DSeries((int)(sizeof(dataX) / sizeof(dataX[0])), (int)(sizeof(dataY)
/ sizeof(dataY[0])), -0.9, 1.15);
// Create a XYChart object of size 640 x 460 pixels
XYChart *c = new XYChart(640, 460);
// Set the plotarea at (30, 25) and of size 400 x 400 pixels. Use semi-transparent grey
// (0xdd000000) horizontal and vertical grid lines
c->setPlotArea(50, 25, 400, 400, -1, -1, Chart::Transparent, 0xdd000000, -1);
// Set the x and y axis stems to transparent and the label font to 12pt Arial
c->xAxis()->setColors(Chart::Transparent);
c->yAxis()->setColors(Chart::Transparent);
c->xAxis()->setLabelStyle("arial.ttf", 12);
c->yAxis()->setLabelStyle("arial.ttf", 12);
// Set the x-axis and y-axis scale
c->xAxis()->setLinearScale(0, 10, 1);
c->yAxis()->setLinearScale(0, 10, 1);
// Add a contour layer using the given data
ContourLayer *layer = c->addContourLayer(DoubleArray(dataX, (int)(sizeof(dataX) / sizeof(dataX[0
]))), DoubleArray(dataY, (int)(sizeof(dataY) / sizeof(dataY[0]))), dataZ);
// Move the grid lines in front of the contour layer
c->getPlotArea()->moveGridBefore(layer);
// Define the color scale
double colorScale[] = {-0.8, 0x0066ff, -0.5, 0x66ccff, -0.3, 0x66ffff, 0, 0x88ff88, 0.4,
0x00ff00, 0.7, 0xffff00, 0.9, 0xff6600, 1.0, 0xcc0000, 1.1};
// Apply the color scale, and specify the underflow and overflow colors for regions exceeding
// the color scale
layer->colorAxis()->setColorScale(DoubleArray(colorScale, (int)(sizeof(colorScale) / sizeof(
colorScale[0]))), 0x0000cc, 0x000000);
//
// Instead of displaying the color axis, we use a legend box to display the colors. This is
// useful for colors that are unevenly spaced on the color axis.
//
// Add a legend box at (460, 25) with vertical layout, with 12pt Arial font, transparent
// background and border, icon size of 15 x 15 pixels, and line spacing of 8 pixels.
LegendBox *b = c->addLegend(460, 25, true, "arial.ttf", 12);
b->setBackground(Chart::Transparent, Chart::Transparent);
b->setKeySize(15, 15);
b->setKeySpacing(0, 8);
// Add the legend box entries
b->addKey("> 1.1 (Critical)", 0x000000);
b->addKey("1.0 to 1.1 (Alert)", 0xcc0000);
b->addKey("0.9 to 1.0", 0xff6600);
b->addKey("0.7 to 0.9", 0xffff00);
b->addKey("0.4 to 0.7", 0x00ff00);
b->addKey("0.0 to 0.4", 0x88ff88);
b->addKey("-0.3 to 0.0", 0x66ffff);
b->addKey("-0.5 to -0.3", 0x66ccff);
b->addKey("-0.8 to -0.5", 0x0066ff);
b->addKey("< -0.8", 0x0000cc);
// Output the chart
c->makeChart("contourlegend.png");
//free up resources
delete r;
delete c;
return 0;
}