Example 2: Treemap with unsorted data

A treemap is constructed from business analytics data. The area is proportional to the company's sales volume and the color scale maps to a performance indicator. The raw data are unsorted and must be sorted by the area values before creating the chart. 

import com.imsl.chart.*;

public class TreemapEx2 extends javax.swing.JApplet {

    public void init() {
        Chart chart = new Chart(this);
        JPanelChart panel = new JPanelChart(chart);
        getContentPane().add(panel, java.awt.BorderLayout.CENTER);
        setup(chart);
    }

    static private void setup(Chart chart) {
        AxisXY axis = new AxisXY(chart);

        double[] areas = {834, 11359, 1621, 12282, 14646, 8686, 12114, 61402,
            582, 9448, 1678};
        double[] perf = {-1.75, -.99, -1.4, 0.12, -0.28, -1.14, -0.06, 0.37,
            -0.66, 0, 0.75};
        String[] labels = {"Amer. It. Pasta", "Campbell Soup", "Dean Foods",
            "General Mills", "Heinz", "Hershey Foods", "Kellogg", "Kraft Foods",
            "Ralston Purina", "Sara Lee", "Suiza Foods"};

        // sort data
        double[] s_perf = new double[perf.length];
        String[] s_lab = new String[perf.length];
        int[] idx = new int[perf.length];
        com.imsl.stat.Sort.descending(areas, idx);
        for (int i = 0; i < perf.length; i++) {
            s_perf[i] = perf[idx[i]];
            s_lab[i] = labels[idx[i]];
        }

        Treemap treemap = new Treemap(axis, areas, s_perf,
                Colormap.BLUE_GREEN_RED_YELLOW);
        treemap.setLabels(s_lab);
        treemap.setTextColor(java.awt.Color.gray);
        treemap.getTreemapLegend().setPaint(true);
        treemap.getTreemapLegend().setTitle("Scale");
        treemap.getTreemapLegend().setTextFormat("0.0");
    }

    public static void main(String argv[]) throws Exception {
        JFrameChart frame = new JFrameChart();
        TreemapEx2.setup(frame.getChart());
        frame.setVisible(true);
    }
}

Output

eqn_0374

Link to Java source.