Changing the shapes of points in scatter plot

java, jfreechart

Solution

A `ScatterRenderer` inherits `getItemShape()` from `AbstractRenderer`. You can override `getItemShape()` to supply your own shapes.

Addendum: One advantage to this approach is that you can specify a `Shape` for each item in each series.

Addendum: To use `ShapeUtilities.createDiagonalCross()`, do something like this:

Shape cross = ShapeUtilities.createDiagonalCross(3, 1);
plot = (XYPlot) chart.getPlot();
renderer = plot.getRenderer();
renderer.setSeriesShape(0, cross);

Addendum: Just switch to `setSeriesShape()`. Also, skip the `XYDotRenderer` and `Math.round()`.

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Shape;
import java.util.*;
import javax.swing.JPanel;
import org.jfree.chart.*;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYItemRenderer;
import org.jfree.data.xy.XYDataset;
import org.jfree.data.xy.XYSeries;
import org.jfree.data.xy.XYSeriesCollection;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.RefineryUtilities;
import org.jfree.util.ShapeUtilities;

public class SPlotfinal extends ApplicationFrame {

    public SPlotfinal(String s) {
        super(s);
        JPanel jpanel = createDemoPanel();
        jpanel.setPreferredSize(new Dimension(640, 480));
        add(jpanel);
    }

    public static JPanel createDemoPanel() {
        JFreeChart jfreechart = ChartFactory.createScatterPlot(
            "Scatter Plot Demo", "X", "Y", samplexydataset2(),
            PlotOrientation.VERTICAL, true, true, false);
        Shape cross = ShapeUtilities.createDiagonalCross(3, 1);
        XYPlot xyPlot = (XYPlot) jfreechart.getPlot();
        xyPlot.setDomainCrosshairVisible(true);
        xyPlot.setRangeCrosshairVisible(true);
        XYItemRenderer renderer = xyPlot.getRenderer();
        renderer.setSeriesShape(0, cross);
        renderer.setSeriesPaint(0, Color.red);
        return new ChartPanel(jfreechart);
    }

    private static XYDataset samplexydataset2() {
        int cols = 20;
        int rows = 20;
        double[][] values = new double[cols][rows];
        XYSeriesCollection xySeriesCollection = new XYSeriesCollection();
        XYSeries series = new XYSeries("Random");
        Random rand = new Random();
        for (int i = 0; i < values.length; i++) {
            for (int j = 0; j < values[i].length; j++) {
                double x = rand.nextGaussian();
                double y = rand.nextGaussian();
                series.add(x, y);
            }
        }
        xySeriesCollection.addSeries(series);
        return xySeriesCollection;
    }

    public static void main(String args[]) {
        SPlotfinal scatterplotdemo4 = new SPlotfinal("Scatter Plot Demo 4");
        scatterplotdemo4.pack();
        RefineryUtilities.centerFrameOnScreen(scatterplotdemo4);
        scatterplotdemo4.setVisible(true);
    }
}

Problem

I have thousands of points to Plot on a `JFreeChart` scatter plot. The problem right now is that my program is plotting points with "squares", but I need some help on how to change the `Shape` of points from "squares" to "dots/circles". Any help would be appreciated. //*I am using ShapeUtilities,but its not changing the shape of point to "DaigonalCross" when I am Using for XYItemRenderer/XYDotRenderer--Any corrections please if anythng wrong in the code ..*/// ``` import java.awt.Color; import java.awt.Dimension; import java.awt.Shape; import java.util.*; import javax.swing.JPanel; import org.jfree.chart.*; import org.jfree.chart.plot.PlotOrientation; import org.jfree.chart.plot.XYPlot; import org.jfree.chart.renderer.xy.XYItemRenderer; import org.jfree.chart.renderer.xy.XYDotRenderer; import org.jfree.data.xy.XYDataset; import org.jfree.data.xy.XYSeries; import org.jfree.data.xy.XYSeriesCollection; import org.jfree.ui.ApplicationFrame; import org.jfree.ui.RefineryUtilities; import org.jfree.util.ShapeUtilities; public class SPlotfinal extends ApplicationFrame { public SPlotfinal(String s) { super(s); JPanel jpanel = createDemoPanel(); jpanel.setPreferredSize(new Dimension(500, 270)); setContentPane(jpanel); } public static JPanel createDemoPanel() { JFreeChart jfreechart = ChartFactory.createScatterPlot("Scatter Plot Demo", "X", "Y", samplexydataset2(), PlotOrientation.VERTICAL, true, true, false); Shape cross = ShapeUtilities.createDiagonalCross(3, 1); XYPlot xyPlot = (XYPlot) jfreechart.getPlot(); XYItemRenderer renderer = xyPlot.getRenderer(); renderer.setBaseShape(cross); renderer.setBasePaint(Color.red); //changing the Renderer to XYDotRenderer //xyPlot.setRenderer(new XYDotRenderer()); XYDotRenderer xydotrenderer = new XYDotRenderer(); xyPlot.setRenderer(xydotrenderer); xydotrenderer.setSeriesShape(0, cross); xyPlot.setDomainCrosshairVisible(true); xyPlot.setRangeCrosshairVisible(true); return new ChartPanel(jfreechart); } private static XYDataset samplexydataset2() { int cols = 20; int rows = 20; double[][] values = new double[cols][rows]; XYSeriesCollection xySeriesCollection = new XYSeriesCollection(); XYSeries series = new XYSeries("Random"); Random rand = new Random(); for (int i = 0; i < values.length; i++) { for (int j = 0; j < values[i].length; j++) { double x = Math.round(rand.nextDouble() * 500); double y = Math.round(rand.nextDouble() * 500); series.add(x, y); } } xySeriesCollection.addSeries(series); return xySeriesCollection; } public static void main(String args[]) { SPlotfinal scatterplotdemo4 = new SPlotfinal("Scatter Plot Demo 4"); scatterplotdemo4.pack(); RefineryUtilities.centerFrameOnScreen(scatterplotdemo4); scatterplotdemo4.setVisible(true); } } ```

Original source

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