#include <QApplication>
#include "tracklegend.h"
#include <vector>
#include <sstream>
using namespace std;
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
app.setStyleSheet("* {font-family:arial;font-size:11px}");
TrackLegend demo;
demo.show();
return app.exec();
}
TrackLegend::TrackLegend(QWidget *parent) :
QDialog(parent)
{
setWindowTitle("Track Line with Legend");
// Create the QChartViewer and draw the chart
m_ChartViewer = new QChartViewer(this);
drawChart(m_ChartViewer);
// Set the window to be of the same size as the chart
setFixedSize(m_ChartViewer->width(), m_ChartViewer->height());
// Set up the mouseMovePlotArea handler for drawing the track cursor
connect(m_ChartViewer, SIGNAL(mouseMovePlotArea(QMouseEvent*)),
SLOT(onMouseMovePlotArea(QMouseEvent*)));
}
TrackLegend::~TrackLegend()
{
delete m_ChartViewer->getChart();
}
//
// Draw the chart and display it in the given viewer
//
void TrackLegend::drawChart(QChartViewer *viewer)
{
// Data for the chart as 3 random data series
RanSeries r(127);
DoubleArray data0 = r.getSeries(100, 100, -15, 15);
DoubleArray data1 = r.getSeries(100, 150, -15, 15);
DoubleArray data2 = r.getSeries(100, 200, -15, 15);
DoubleArray timeStamps = r.getDateSeries(100, Chart::chartTime(2011, 1, 1), 86400);
// Create a XYChart object of size 640 x 400 pixels
XYChart *c = new XYChart(640, 400);
// Add a title to the chart using 18 pts Times New Roman Bold Italic font
c->addTitle(" Product Line Global Revenue", "timesbi.ttf", 18);
// Set the plotarea at (50, 55) with width 70 pixels less than chart width, and height 90 pixels
// less than chart height. Use a vertical gradient from light blue (f0f6ff) to sky blue (a0c0ff)
// as background. Set border to transparent and grid lines to white (ffffff).
c->setPlotArea(50, 55, c->getWidth() - 70, c->getHeight() - 90, c->linearGradientColor(0, 55, 0,
c->getHeight() - 35, 0xf0f6ff, 0xa0c0ff), -1, Chart::Transparent, 0xffffff, 0xffffff);
// Set legend icon style to use line style icon, sized for 8pt font
c->getLegend()->setLineStyleKey();
c->getLegend()->setFontSize(8);
// Set axis label style to 8pts Arial Bold
c->xAxis()->setLabelStyle("arialbd.ttf", 8);
c->yAxis()->setLabelStyle("arialbd.ttf", 8);
// Set the axis stem to transparent
c->xAxis()->setColors(Chart::Transparent);
c->yAxis()->setColors(Chart::Transparent);
// Configure x-axis label format
c->xAxis()->setMultiFormat(Chart::StartOfYearFilter(), "{value|mm/yyyy} ",
Chart::StartOfMonthFilter(), "{value|mm}");
// Add axis title using 10pts Arial Bold Italic font
c->yAxis()->setTitle("USD millions", "arialbi.ttf", 10);
// Add a line layer to the chart using a line width of 2 pixels.
LineLayer *layer = c->addLineLayer();
layer->setLineWidth(2);
// Add 3 data series to the line layer
layer->setXData(timeStamps);
layer->addDataSet(data0, 0xff3333, "Alpha");
layer->addDataSet(data1, 0x008800, "Beta");
layer->addDataSet(data2, 0x3333cc, "Gamma");
// Include track line with legend for the latest data values
trackLineLegend(c, c->getPlotArea()->getRightX());
// Set the chart image to the QChartViewer
viewer->setChart(c);
}
//
// Draw track cursor when mouse is moving over plotarea
//
void TrackLegend::onMouseMovePlotArea(QMouseEvent *)
{
trackLineLegend((XYChart *)m_ChartViewer->getChart(), m_ChartViewer->getPlotAreaMouseX());
m_ChartViewer->updateDisplay();
}
//
// Draw the track line with legend
//
void TrackLegend::trackLineLegend(XYChart *c, int mouseX)
{
// Clear the current dynamic layer and get the DrawArea object to draw on it.
DrawArea *d = c->initDynamicLayer();
// The plot area object
PlotArea *plotArea = c->getPlotArea();
// Get the data x-value that is nearest to the mouse, and find its pixel coordinate.
double xValue = c->getNearestXValue(mouseX);
int xCoor = c->getXCoor(xValue);
// Draw a vertical track line at the x-position
d->vline(plotArea->getTopY(), plotArea->getBottomY(), xCoor, d->dashLineColor(0x000000, 0x0101));
// Container to hold the legend entries
vector<string> legendEntries;
// Iterate through all layers to build the legend array
for (int i = 0; i < c->getLayerCount(); ++i) {
Layer *layer = c->getLayerByZ(i);
// The data array index of the x-value
int xIndex = layer->getXIndexOf(xValue);
// Iterate through all the data sets in the layer
for (int j = 0; j < layer->getDataSetCount(); ++j) {
DataSet *dataSet = layer->getDataSetByZ(j);
// We are only interested in visible data sets with names
const char *dataName = dataSet->getDataName();
int color = dataSet->getDataColor();
if (dataName && *dataName && (color != (int)Chart::Transparent)) {
// Build the legend entry, consist of the legend icon, name and data value.
double dataValue = dataSet->getValue(xIndex);
ostringstream legendEntry;
legendEntry << "<*block*>" << dataSet->getLegendIcon() << " " << dataName << ": " <<
((dataValue == Chart::NoValue) ? "N/A" : c->formatValue(dataValue, "{value|P4}"))
<< "<*/*>";
legendEntries.push_back(legendEntry.str());
// Draw a track dot for data points within the plot area
int yCoor = c->getYCoor(dataSet->getPosition(xIndex), dataSet->getUseYAxis());
if ((yCoor >= plotArea->getTopY()) && (yCoor <= plotArea->getBottomY())) {
d->circle(xCoor, yCoor, 4, 4, color, color);
}
}
}
}
// Create the legend by joining the legend entries
ostringstream legendText;
legendText << "<*block,maxWidth=" << plotArea->getWidth() << "*><*block*><*font=arialbd.ttf*>["
<< c->xAxis()->getFormattedLabel(xValue, "mmm dd, yyyy") << "]<*/*>";
for (int i = ((int)legendEntries.size()) - 1; i >= 0; --i)
legendText << " " << legendEntries[i];
// Display the legend on the top of the plot area
TTFText *t = d->text(legendText.str().c_str(), "arial.ttf", 8);
t->draw(plotArea->getLeftX() + 5, plotArea->getTopY() - 3, 0x000000, Chart::BottomLeft);
t->destroy();
} |