This section describes the construction of scatter charts. The markers can be formatted using the Marker Attributes.

It is also possible to mix lines, tubes, markers and surfaces on a single chart (see Marker Attributes).

Fisher Iris Data Set

Fisher's Iris data set is read from a flat file and is charted. Each observation in this data set has five values: species, sepal length, sepal width, petal length, and petal width. The sepal length is mapped into the x-coordinate, the sepal width is mapped to the y-coordinate, and the petal length is mapped into the z-coordinate. The petal width is mapped into the marker size. The species is mapped into the marker color.

(Download Code)

 

import com.imsl.chart3d.*;

import com.imsl.io.FlatFile;

import java.awt.Color;

import java.io.*;

import java.sql.SQLException;

import java.util.StringTokenizer;

 

public class SampleFisherIris extends JFrameChart3D {

    private int species[];

    private double sepalLength[];

    private double sepalWidth[];

    private double petalLength[];

    private double petalWidth[];

 

    public SampleFisherIris() throws IOException, SQLException {

        read();

       

        Chart3D chart = getChart3D();

        chart.getBackground().setFillColor("lightyellow");

        AxisXYZ axis = new AxisXYZ(chart);

        axis.setAxisTitlePosition(axis.AXIS_TITLE_PARALLEL);

       

        axis.getAxisX().getAxisTitle().setTitle("Sepal Length");

        axis.getAxisY().getAxisTitle().setTitle("Sepal Width");

        axis.getAxisZ().getAxisTitle().setTitle("Petal Length");

       

        axis.setDataType(Data.DATA_TYPE_MARKER);

        axis.setMarkerType(Data.MARKER_TYPE_SPHERE);

        Color color[] = {Color.red, Color.green, Color.blue};

       

        for (int k = 0;  k < species.length;  k++) {

            // marker type = Species

            // x = Sepal Length

            // y = Sepal Width

            // z = Petal Length

            // marker size = Petal Width

            double xp[] = {sepalLength[k]};

            double yp[] = {sepalWidth[k]};

            double zp[] = {petalLength[k]};

            Data data = new Data(axis, xp, yp, zp);

            data.setMarkerSize(Math.sqrt(petalWidth[k]));

            data.setMarkerColor(color[species[k]-1]);

        }         

        setSize(800, 800);

        render();

    }

   

    void read() throws IOException, SQLException {

        InputStream is =

            getClass().getResourceAsStream("FisherIris.csv");

        FisherIrisReader fisherIrisReader =

            new FisherIrisReader(is);

        int nObs = 150;

        species = new int[nObs];

        sepalLength = new double[nObs];

        sepalWidth = new double[nObs];

        petalLength = new double[nObs];

        petalWidth = new double[nObs];

        for (int k = 0;  fisherIrisReader.next();  k++) {

            species[k] = fisherIrisReader.getInt("Species");

            sepalLength[k] =

                fisherIrisReader.getDouble("Sepal Length");

            sepalWidth[k] =

                fisherIrisReader.getDouble("Sepal Width");

            petalLength[k] =

                fisherIrisReader.getDouble("Petal Length");

            petalWidth[k] =

                fisherIrisReader.getDouble("Petal Width");

        }

    }

   

    static private class FisherIrisReader extends FlatFile {

        public FisherIrisReader(InputStream is)

            throws IOException {

            super(new BufferedReader(new InputStreamReader(is)));

            String line = readLine();

            StringTokenizer st = new StringTokenizer(line, ",");

            for (int j = 0;  st.hasMoreTokens();  j++) {

                setColumnName(j+1, st.nextToken().trim());

                setColumnClass(j, Double.class);

            }

        }

    }

 

    public static void main(String args[])

            throws IOException, SQLException {

        new SampleFisherIris().setVisible(true);

    }   

}

 

 

 

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