ChartDirector 6.0 (C++ Edition)

Percentage Area Chart




This example demonstrates creating a percentage area chart. It also demonstrates how to include icons in the legend box using CDML.

A percentage area chart is like a stacked area chart, except the areas are individually scaled so that they stacked up to 100.

Note that in this example, the legend box contains icons. This is achieved by including the icons in the data set name using CDML.

The key features demonstrated in this example are:

Source Code Listing

[The following code is available in "cppdemo/percentarea". 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, 55, 47, 34, 42, 49, 63, 62, 73, 59, 56, 50, 64, 60, 67, 67, 58, 59, 73,
        77, 84, 82, 80, 84, 98};
    double data2[] = {87, 89, 85, 66, 53, 39, 24, 21, 37, 56, 37, 23, 21, 33, 13, 17, 14, 23, 16,
        25, 29, 30, 45, 47, 46};

    // The timestamps on the x-axis
    double labels[] = {Chart::chartTime(1996, 1, 1), Chart::chartTime(1996, 4, 1), Chart::chartTime(
        1996, 7, 1), Chart::chartTime(1996, 10, 1), Chart::chartTime(1997, 1, 1), Chart::chartTime(
        1997, 4, 1), Chart::chartTime(1997, 7, 1), Chart::chartTime(1997, 10, 1), Chart::chartTime(
        1998, 1, 1), Chart::chartTime(1998, 4, 1), Chart::chartTime(1998, 7, 1), Chart::chartTime(
        1998, 10, 1), Chart::chartTime(1999, 1, 1), Chart::chartTime(1999, 4, 1), Chart::chartTime(
        1999, 7, 1), Chart::chartTime(1999, 10, 1), Chart::chartTime(2000, 1, 1), Chart::chartTime(
        2000, 4, 1), Chart::chartTime(2000, 7, 1), Chart::chartTime(2000, 10, 1), Chart::chartTime(
        2001, 1, 1), Chart::chartTime(2001, 4, 1), Chart::chartTime(2001, 7, 1), Chart::chartTime(
        2001, 10, 1), Chart::chartTime(2002, 1, 1)};

    // Create a XYChart object of size 500 x 280 pixels, using 0xffffcc as background color, with a
    // black border, and 1 pixel 3D border effect
    XYChart *c = new XYChart(500, 280, 0xffffcc, 0, 1);

    // Set the plotarea at (50, 45) and of size 320 x 200 pixels with white background. Enable
    // horizontal and vertical grid lines using the grey (0xc0c0c0) color.
    c->setPlotArea(50, 45, 320, 200, 0xffffff)->setGridColor(0xc0c0c0, 0xc0c0c0);

    // Add a legend box at (370, 45) using vertical layout and 8 points Arial Bold font.
    LegendBox *legendBox = c->addLegend(370, 45, true, "arialbd.ttf", 8);

    // Set the legend box background and border to transparent
    legendBox->setBackground(Chart::Transparent, Chart::Transparent);

    // Set the legend box icon size to 16 x 32 pixels to match with custom icon size
    legendBox->setKeySize(16, 32);

    // Add a title to the chart using 14 points Times Bold Itatic font and white font color, and
    // 0x804020 as the background color
    c->addTitle("Quarterly Product Sales", "timesbi.ttf", 14, 0xffffff)->setBackground(0x804020);

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

    // Set multi-style axis label formatting. Start of year labels are displayed as yyyy. For other
    // labels, just show minor tick.
    c->xAxis()->setMultiFormat(Chart::StartOfYearFilter(), "{value|yyyy}", Chart::AllPassFilter(),
        "-");

    // Add a percentage area layer to the chart
    AreaLayer *layer = c->addAreaLayer(Chart::Percentage);

    // Add the three data sets to the area layer, using icons images with labels as data set names
    layer->addDataSet(DoubleArray(data0, (int)(sizeof(data0) / sizeof(data0[0]))), 0x40ddaa77,
        "<*block,valign=absmiddle*><*img=service.png*> Service<*/*>");
    layer->addDataSet(DoubleArray(data1, (int)(sizeof(data1) / sizeof(data1[0]))), 0x40aadd77,
        "<*block,valign=absmiddle*><*img=software.png*> Software<*/*>");
    layer->addDataSet(DoubleArray(data2, (int)(sizeof(data2) / sizeof(data2[0]))), 0x40aa77dd,
        "<*block,valign=absmiddle*><*img=computer.png*> Hardware<*/*>");

    // For a vertical stacked chart with positive data only, the last data set is always on top.
    // However, in a vertical legend box, the last data set is at the bottom. This can be reversed
    // by using the setLegend method.
    layer->setLegend(Chart::ReverseLegend);

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

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