Simple Tree Map

This example demonstrates the basic steps in creating a tree map.

Create a TreeMapChart object using TreeMapChart.TreeMapChart.
Specify the plot area of the chart using TreeMapChart.setPlotArea.
Obtain the root node of the tree map using TreeMapChart,getRootNode and add child nodes to it using TreeMapNode.setData.
Get the child node prototype using TreeMapChart.getLevelPrototype and use it to configure the styles of all the child nodes.
Pass the chart to the CChartViewer for display using CChartViewer.setChart (MFC version) or QChartViewer.setChart (Qt version), or generate the chart as an image file using BaseChart.makeChart (Command Line version).
Generate tool tips for the chart using BaseChart.getHTMLImageMap. (MFC/Qt version)

The following is the command line version of the code in "cppdemo/simpletreemap". 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[])
{
    // Data for the tree map
    double data[] = {25, 18, 15, 12, 8, 30, 35};
    const int data_size = (int)(sizeof(data)/sizeof(*data));

    // Labels for the tree map
    const char* labels[] = {"Alpha", "Beta", "Gamma", "Delta", "Epsilon", "Zeta", "Eta"};
    const int labels_size = (int)(sizeof(labels)/sizeof(*labels));

    // Colors for the tree map
    int colors[] = {0xff5555, 0xff9933, 0xffff44, 0x66ff66, 0x44ccff, 0x6699ee, 0xdd99dd};
    const int colors_size = (int)(sizeof(colors)/sizeof(*colors));

    // Create a Tree Map object of size 400 x 400 pixels
    TreeMapChart* c = new TreeMapChart(400, 400);

    // Set the plotarea at (10, 10) and of size 380 x 380 pixels
    c->setPlotArea(10, 10, 380, 380);

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

    // Add first level nodes to the root.
    root->setData(DoubleArray(data, data_size), StringArray(labels, labels_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 and value with 8pt Arial Bold font in
    // black color (000000) and center aligned in the node.
    nodeConfig->setLabelFormat("{label}<*br*>{value}", "Arial Bold", 8, 0x000000, Chart::Center);

    // Set the node fill color to the provided color and the border color to white (ffffff)
    nodeConfig->setColors(-1, 0xffffff);

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

    //free up resources
    delete c;

    return 0;
}