Overlapping Bar Chart

The following is the command line version of the code in "cppdemo/overlapbar". The MFC version of the code is in "mfcdemo/mfcdemo". The Qt Widgets version of the code is in "qtdemo/qtdemo". The QML/Qt Quick version of the code is in "qmldemo/qmldemo".

#include "chartdir.h"

int main(int argc, char *argv[])
{
    // The data for the bar chart
    double data0[] = {100, 125, 156, 147, 87, 124, 178, 109, 140, 106, 192, 122};
    const int data0_size = (int)(sizeof(data0)/sizeof(*data0));
    double data1[] = {122, 156, 179, 211, 198, 177, 160, 220, 190, 188, 220, 270};
    const int data1_size = (int)(sizeof(data1)/sizeof(*data1));
    double data2[] = {167, 190, 213, 267, 250, 320, 212, 199, 245, 267, 240, 310};
    const int data2_size = (int)(sizeof(data2)/sizeof(*data2));
    const char* labels[] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sept", "Oct",
        "Nov", "Dec"};
    const int labels_size = (int)(sizeof(labels)/sizeof(*labels));

    // Create a XYChart object of size 580 x 280 pixels
    XYChart* c = new XYChart(580, 280);

    // Add a title to the chart using 14pt Arial Bold Italic font
    c->addTitle("Product Revenue For Last 3 Years", "Arial Bold Italic", 14);

    // Set the plot area at (50, 50) and of size 500 x 200. Use two alternative background colors
    // (f8f8f8 and ffffff)
    c->setPlotArea(50, 50, 500, 200, 0xf8f8f8, 0xffffff);

    // Add a legend box at (50, 25) using horizontal layout. Use 8pt Arial as font, with transparent
    // background.
    c->addLegend(50, 25, false, "Arial", 8)->setBackground(Chart::Transparent);

    // Set the x axis labels
    c->xAxis()->setLabels(StringArray(labels, labels_size));

    // Draw the ticks between label positions (instead of at label positions)
    c->xAxis()->setTickOffset(0.5);

    // Add a multi-bar layer with 3 data sets
    BarLayer* layer = c->addBarLayer(Chart::Side);
    layer->addDataSet(DoubleArray(data0, data0_size), 0xff8080, "Year 2003");
    layer->addDataSet(DoubleArray(data1, data1_size), 0x80ff80, "Year 2004");
    layer->addDataSet(DoubleArray(data2, data2_size), 0x8080ff, "Year 2005");

    // Set 50% overlap between bars
    layer->setOverlapRatio(0.5);

    // Add a title to the y-axis
    c->yAxis()->setTitle("Revenue (USD in millions)");

    // Output the chart
    c->makeChart("overlapbar.png");

    //free up resources
    delete c;

    return 0;
}