addAnnotation function of the ContourPlot class can't work

[alsw-2000]

Dear all,

I have make a contour chart like this

but my requirement is to make a contour chart on a category axis.
And I find that the contour chart only support value axis so I want to use the following work around (please tell me if there is a better way)
1. hidden the axis's tick label
2. add annotation at the position of the tick label to make the axis looks like a category axis

However, I found that the addAnnotation function of the ContourPlot class can't work !!!

It seems that the addAnnotation function only support XYPlot and CategoryPlot, but ContourPlot is not their subclass, so it can't work.

Here is my code for your reference:

Code: Select all

package charts.jfreechart;

import java.awt.Font;
import java.awt.Color;
import java.awt.GradientPaint;
import java.util.Date;

import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.ColorBar;
import org.jfree.chart.axis.DateAxis;
import org.jfree.chart.axis.LogarithmicAxis;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.plot.ContourPlot;
import org.jfree.data.ContourDataset;
import org.jfree.data.NonGridContourDataset;
import org.jfree.data.DefaultContourDataset;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.RefineryUtilities;
import org.jfree.chart.ui.ColorPalette;
import org.jfree.chart.ui.RainbowPalette;
import org.jfree.chart.annotations.XYTextAnnotation;
import org.jfree.chart.annotations.XYPointerAnnotation;
import org.jfree.ui.TextAnchor;



public class JFree_Contour extends ApplicationFrame
{
	public ChartPanel panel = null;

	public JFree_Contour(String title)
	{
		super(title);

		JFreeChart chart = createContourPlot();
		panel = new ChartPanel(chart, true, true, true, true, true);
		panel.setPreferredSize(new java.awt.Dimension(500, 270));
		panel.setMaximumDrawHeight(100000); //stop ChartPanel from scaling output
		panel.setMaximumDrawWidth(100000); //stop ChartPanel from scaling output
		panel.setHorizontalZoom(true);
		panel.setVerticalZoom(true);
		panel.setFillZoomRectangle(true);

	}

	/**
	 * Creates a ContourPlot chart.
	 *
	 * @return the chart.
	 */
	private JFreeChart createContourPlot()
	{
		String title = "Contour Plot";
		String xAxisLabel = "Option Delta";
		String yAxisLabel = "Maturity";
		String zAxisLabel = "";

		ValueAxis xAxis = null;
		NumberAxis yAxis = null;
		ColorBar zColorBar = null;

		xAxis = new NumberAxis(xAxisLabel);
		yAxis = new NumberAxis(yAxisLabel);
		zColorBar = new ColorBar(zAxisLabel);

		((NumberAxis) xAxis).setAutoRangeIncludesZero(false);
		xAxis.setTickLabelsVisible(false);
		xAxis.setTickMarksVisible(false);

		yAxis.setAutoRangeIncludesZero(false);
		yAxis.setTickLabelsVisible(false);
		yAxis.setTickMarksVisible(false);

		((NumberAxis) xAxis).setLowerMargin(0.0);
		((NumberAxis) xAxis).setUpperMargin(0.0);

		yAxis.setLowerMargin(0.0);
		yAxis.setUpperMargin(0.0);

		zColorBar.getAxis().setTickMarksVisible(true);
		zColorBar.setMinimumValue(-250);
		zColorBar.setMaximumValue(200);

		NonGridContourDataset data = createDataset();

		ColorPalette cp = new RainbowPalette();

		// stepping = 50
		double x[] = {-250,-200,-150,-100,-50, 0, 50, 100, 150, 200};

		cp.setTickValues(x);
		cp.setStepped(true);

		zColorBar.setColorPalette(cp);

		ContourPlot plot = new ContourPlot(data, xAxis, yAxis, zColorBar);
				
		plot.setDataAreaRatio(0);

		// Shove in the text
		XYTextAnnotation a1 = new XYTextAnnotation("10P", 20, 20);
		a1.setFont(new Font("SansSerif", Font.PLAIN, 12));
//		a1.setTextAnchor(TextAnchor.TOP_CENTER);
		plot.addAnnotation(a1);
		
		JFreeChart chart = new JFreeChart(title, null, plot, false);

		return chart;
	}

	private NonGridContourDataset createDataset()
	{
		NonGridContourDataset data = null;
		
// dataset of Andy Huson
 
		Double[] oDoubleX = new Double[25];
		Double[] oDoubleY = new Double[25];
		Double[] oDoubleZ = new Double[25];

		// 10P
		oDoubleX[0] = new Double(1);
		oDoubleY[0] = new Double(1);
		oDoubleZ[0] = new Double(-50);

		oDoubleX[1] = new Double(1);
		oDoubleY[1] = new Double(2);
		oDoubleZ[1] = new Double(-38.50);

		oDoubleX[2] = new Double(1);
		oDoubleY[2] = new Double(3);
		oDoubleZ[2] = new Double(-38.50);

		oDoubleX[3] = new Double(1);
		oDoubleY[3] = new Double(4);
		oDoubleZ[3] = new Double(-38.50);

		oDoubleX[4] = new Double(1);
		oDoubleY[4] = new Double(5);
		oDoubleZ[4] = new Double(-38.50);

		// 25P
		oDoubleX[5] = new Double(2);
		oDoubleY[5] = new Double(1);
		oDoubleZ[5] = new Double(-13.2);

		oDoubleX[6] = new Double(2);
		oDoubleY[6] = new Double(2);
		oDoubleZ[6] = new Double(-41.05);

		oDoubleX[7] = new Double(2);
		oDoubleY[7] = new Double(3);
		oDoubleZ[7] = new Double(-41.05);

		oDoubleX[8] = new Double(2);
		oDoubleY[8] = new Double(4);
		oDoubleZ[8] = new Double(-41.05);

		oDoubleX[9] = new Double(2);
		oDoubleY[9] = new Double(5);
		oDoubleZ[9] = new Double(-41.05);

		// ATM
		oDoubleX[10] = new Double(3);
		oDoubleY[10] = new Double(1);
		oDoubleZ[10] = new Double(-22.86);

		oDoubleX[11] = new Double(3);
		oDoubleY[11] = new Double(2);
		oDoubleZ[11] = new Double(-138);

		oDoubleX[12] = new Double(3);
		oDoubleY[12] = new Double(3);
		oDoubleZ[12] = new Double(-138);

		oDoubleX[13] = new Double(3);
		oDoubleY[13] = new Double(4);
		oDoubleZ[13] = new Double(-138);

		oDoubleX[14] = new Double(3);
		oDoubleY[14] = new Double(5);
		oDoubleZ[14] = new Double(-138);

		// 25C
		oDoubleX[15] = new Double(4);
		oDoubleY[15] = new Double(1);
		oDoubleZ[15] = new Double(-27.96);

		oDoubleX[16] = new Double(4);
		oDoubleY[16] = new Double(2);
		oDoubleZ[16] = new Double(-51.91);

		oDoubleX[17] = new Double(4);
		oDoubleY[17] = new Double(3);
		oDoubleZ[17] = new Double(-51.91);

		oDoubleX[18] = new Double(4);
		oDoubleY[18] = new Double(4);
		oDoubleZ[18] = new Double(-51.91);

		oDoubleX[19] = new Double(4);
		oDoubleY[19] = new Double(5);
		oDoubleZ[19] = new Double(-51.91);

		// 10C
		oDoubleX[20] = new Double(5);
		oDoubleY[20] = new Double(1);
		oDoubleZ[20] = new Double(-31.01);

		oDoubleX[21] = new Double(5);
		oDoubleY[21] = new Double(2);
		oDoubleZ[21] = new Double(-56.73);

		oDoubleX[22] = new Double(5);
		oDoubleY[22] = new Double(3);
		oDoubleZ[22] = new Double(-56.73);

		oDoubleX[23] = new Double(5);
		oDoubleY[23] = new Double(4);
		oDoubleZ[23] = new Double(-56.73);

		oDoubleX[24] = new Double(5);
		oDoubleY[24] = new Double(5);
		oDoubleZ[24] = new Double(-56.73);

		data = new NonGridContourDataset("Contouring", oDoubleX, oDoubleY, oDoubleZ);

		return data;

	}

	/**
	 * Starting point for the demonstration application.
	 *
	 * @param args  command line options, launch ContourDemoPlot -? for listing of options.
	 */
	public static void main(String[] args)
	{

		JFree_Contour demo = new JFree_Contour("ContourPlot Demo");
		demo.setContentPane(demo.panel);
		demo.pack();
		RefineryUtilities.centerFrameOnScreen(demo);
		demo.setVisible(true);

	}

}

Cheers,
Andy

[david.gilbert]

Why do you want a category axis? Your data values look numeric to me. Still, if you need to display categories, try the SymbolicAxis class which will convert numbers to labels.

The ContourPlot class needs to be changed so that it is a subclass of XYPlot, then annotations etc. will work. Not sure when that will get done. Someone else posted some code to get annotations working, but I forget where (search this forum and also the bugs, patches and RFEs at the SourceForge page.

[Anoop]

Hi,

Im too looking for a functional "Response Surface Plot" which does smoothing and shows contour with gradient colors or just colored curves. I believe many developers are looking for it. Contour plot might be similar to it. We would appreciate if David puts some effort in this area soon.

Here is an example we are looling for :