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);
}
}
Just use the marker argument of the plot() function to custom the shape of the data points.
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);
}
}
You can get the plot (for this example its a XYPlot) and then the renderer and change the base shape like this:
// 5x5 red pixel circle
Shape shape = new Ellipse2D.Double(0,0,5,5);
XYPlot xyPlot = (XYPlot) jFreeCHart.getPlot();
XYItemRenderer renderer = xyPlot.getRenderer();
renderer.setBaseShape(shape);
renderer.setBasePaint(Color.red);
// set only shape of series with index i
renderer.setSeriesShape(i, shape);
You can change much more things, like outline paint/stroke
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