drawing 2d graphics

To whom it may be interest.

This is a small example to draw a chart having "values on X" and "values on Y" :-) using JFreeChart

import java.awt.Font;

import java.awt.image.BufferedImage;

import java.io.File;

import java.io.IOException;

import javax.imageio.ImageIO;

import junit.framework.TestCase;

import org.jfree.chart.ChartFactory;

import org.jfree.chart.JFreeChart;

import org.jfree.chart.axis.NumberAxis;

import org.jfree.chart.plot.PlotOrientation;

import org.jfree.chart.plot.XYPlot;

import org.jfree.chart.title.TextTitle;

import org.jfree.data.xy.XYDataset;

import org.jfree.data.xy.XYSeries;

import org.jfree.data.xy.XYSeriesCollection;

public class SimpleChartTest extends TestCase {

private XYSeriesCollection createDataset() {

XYSeriesCollection result = new XYSeriesCollection();

XYSeries s3 = new XYSeries("P", true, false);

s3.add(0, 2.355450986);

s3.add(0.5, 2.799548641);

s3.add(1.5, 3.614688072);

s3.add(11.5, 8.283364855);

s3.add(12.5, 8.534275028);

s3.add(13.5, 8.762648582);

s3.add(14.5, 8.971407287);

s3.add(15.5, 9.163180317);

s3.add(16.5, 9.340328068);

s3.add(17.5, 9.504964014);

s3.add(19.5, 9.804039109);

s3.add(20.5, 9.941644878);

result.addSeries(s3);

return result;

}

private JFreeChart createChart(XYDataset dataset) {

JFreeChart chart = ChartFactory.createXYLineChart(null,

"Value on X", "Value on Y", dataset, PlotOrientation.VERTICAL, true,

true, false);

TextTitle t1 = new TextTitle("Title1", new Font(

"SansSerif", Font.BOLD, 14));

TextTitle t2 = new TextTitle(

"Title2",

new Font("SansSerif", Font.PLAIN, 11));

chart.addSubtitle(t1);

chart.addSubtitle(t2);

XYPlot plot = chart.getXYPlot();

NumberAxis domainAxis = (NumberAxis) plot.getDomainAxis();

domainAxis.setUpperMargin(0.12);

domainAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());

NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();

rangeAxis.setAutoRangeIncludesZero(false);

return chart;

}

public void test() throws IOException {

XYSeriesCollection dataset = createDataset();

JFreeChart chart = createChart(dataset);

BufferedImage image = chart.createBufferedImage(360, 500);

File file = new File("test-data/charts/newimage.png");

ImageIO.write(image, "png", file);

}

}

NikolayJavaa at 2007-7-12 14:55:03 >