ChartDirector 6.0 (C++ Edition)

Stacked Area Chart




This example demonstrates using multiple data sets to create stacked area chart.

The key features demonstrated in this example are:

Source Code Listing

[The following code is available in "cppdemo/stackedarea". A MFC version of the code is available in "mfcdemo/mfcdemo" (Windows edition only). A QT version of the code is available in "qtdemo/qtdemo".]
#include "chartdir.h"

int main(int argc, char *argv[])
{
    // The data for the area chart
    double data0[] = {42, 49, 33, 38, 51, 46, 29, 41, 44, 57, 59, 52, 37, 34, 51, 56, 56, 60, 70,
        76, 63, 67, 75, 64, 51};
    double data1[] = {50, 45, 47, 34, 42, 49, 63, 62, 73, 59, 56, 50, 64, 60, 67, 67, 58, 59, 73,
        77, 84, 82, 80, 84, 89};
    double data2[] = {61, 79, 85, 66, 53, 39, 24, 21, 37, 56, 37, 22, 21, 33, 13, 17, 4, 23, 16, 25,
        9, 10, 5, 7, 16};
    const char *labels[] = {"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12",
        "13", "14", "15", "16", "17", "18", "19", "20", "21", "22", "23", "24"};

    // Create a XYChart object of size 300 x 210 pixels. Set the background to pale yellow
    // (0xffffc0) with a black border (0x0)
    XYChart *c = new XYChart(300, 210, 0xffffc0, 0x000000);

    // Set the plotarea at (50, 30) and of size 240 x 140 pixels. Use white (0xffffff) background.
    c->setPlotArea(50, 30, 240, 140)->setBackground(0xffffff);

    // Add a legend box at (50, 185) (below of plot area) using horizontal layout. Use 8pt Arial
    // font with Transparent background.
    c->addLegend(50, 185, false, "", 8)->setBackground(Chart::Transparent);

    // Add a title box to the chart using 8pt Arial Bold font, with yellow (0xffff40) background and
    // a black border (0x0)
    c->addTitle("Sales Volume", "arialbd.ttf", 8)->setBackground(0xffff40, 0);

    // Set the y axis label format to US$nnnn
    c->yAxis()->setLabelFormat("US${value}");

    // Set the labels on the x axis.
    c->xAxis()->setLabels(StringArray(labels, (int)(sizeof(labels) / sizeof(labels[0]))));

    // Display 1 out of 2 labels on the x-axis. Show minor ticks for remaining labels.
    c->xAxis()->setLabelStep(2, 1);

    // Add an stack area layer with three data sets
    AreaLayer *layer = c->addAreaLayer(Chart::Stack);
    layer->addDataSet(DoubleArray(data0, (int)(sizeof(data0) / sizeof(data0[0]))), 0x4040ff,
        "Store #1");
    layer->addDataSet(DoubleArray(data1, (int)(sizeof(data1) / sizeof(data1[0]))), 0xff4040,
        "Store #2");
    layer->addDataSet(DoubleArray(data2, (int)(sizeof(data2) / sizeof(data2[0]))), 0x40ff40,
        "Store #3");

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

    //free up resources
    delete c;
    return 0;
}