Tree Map Colors

The following is the command line version of the code in "cppdemo/treemapcolors". 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 first level nodes of the tree map. There are 3 nodes.
    const char* allRegions[] = {"Alpha", "Beta", "Gamma"};
    const int allRegions_size = (int)(sizeof(allRegions)/sizeof(*allRegions));

    // Each first level node branches to become 7 second level nodes.
    const char* energy_types[] = {"Coal", "Oil", "Gas", "Nuclear", "Hydro", "Solar", "Wind"};
    const int energy_types_size = (int)(sizeof(energy_types)/sizeof(*energy_types));

    // Colors for the second level nodes.
    int colors[] = {0x222222, 0x666666, 0x884488, 0xcc0000, 0x3366cc, 0x33cc33, 0x77bbff};
    const int colors_size = (int)(sizeof(colors)/sizeof(*colors));

    // The data for the 3 groups of second level nodes
    double region0[] = {0, 50, 70, 0, 60, 120, 140};
    const int region0_size = (int)(sizeof(region0)/sizeof(*region0));
    double region1[] = {200, 50, 30, 65, 60, 40, 40};
    const int region1_size = (int)(sizeof(region1)/sizeof(*region1));
    double region2[] = {0, 100, 70, 100, 60, 35, 40};
    const int region2_size = (int)(sizeof(region2)/sizeof(*region2));

    // Create a Tree Map object of size 600 x 520 pixels
    TreeMapChart* c = new TreeMapChart(600, 520);

    // Add a title to the chart
    c->addTitle("Energy Usage by Region", "Arial Bold Italic", 18);

    // Set the plotarea at (10, 35) and of size 480 x 480 pixels
    c->setPlotArea(10, 35, 480, 480);

    // Obtain the root of the tree map, which is the entire plot area
    TreeMapNode* root = c->getRootNode();

    // Add first level nodes to the root. We do not need to provide data as they will be computed as
    // the sum of the second level nodes.
    root->setData(DoubleArray(), StringArray(allRegions, allRegions_size));

    // Add second level nodes to each of the first level node
    root->getNode(0)->setData(DoubleArray(region0, region0_size), StringArray(energy_types,
        energy_types_size), IntArray(colors, colors_size));
    root->getNode(1)->setData(DoubleArray(region1, region1_size), StringArray(energy_types,
        energy_types_size), IntArray(colors, colors_size));
    root->getNode(2)->setData(DoubleArray(region2, region2_size), StringArray(energy_types,
        energy_types_size), IntArray(colors, colors_size));

    // Get the prototype (template) for the first level nodes.
    TreeMapNode* nodeConfig = c->getLevelPrototype(1);

    // Set the label format for the nodes to show the label with 8pt Arial Bold font in
    // semi-transparent black color (0x77000000). Put the text at the top left corner of the cell.
    nodeConfig->setLabelFormat("{label}", "Arial Bold", 18, 0x77ffffff, Chart::TopLeft);

    // Set the border color to white (ffffff). Use 2 pixel thick flat border style.
    nodeConfig->setColors(-1, 0xffffff, Chart::flatBorder(2));

    // Get the prototype (template) for the second level nodes.
    TreeMapNode* nodeConfig2 = c->getLevelPrototype(2);

    // Set the label format for the nodes to show the label and value with 8pt Arial Bold font. Put
    // the text at the center of the cell.
    nodeConfig2->setLabelFormat("{label}<*br*>{value}MW", "Arial Bold", 8, 0xffffff, Chart::Center);

    // Set the border color to white (ffffff)
    nodeConfig2->setColors(-1, 0xffffff);

    // Add a legend box at (500, 35) with 12pt Arial font and transparent background and border.
    LegendBox* b = c->addLegend(500, 35, true, "Arial", 12);
    b->setBackground(Chart::Transparent, Chart::Transparent);

    // Add the legend keys for the colors
    for(int i = 0; i < energy_types_size; ++i) {
        b->addKey(energy_types[i], colors[i]);
    }

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

    //free up resources
    delete c;

    return 0;
}