jfreechart datapoint hover over tooltip imagemap

asked 2010-06-01 03:17:04 +0800

kazimbeg
45 ● 4

Hi,
I am using jfreechart using imagemap in the zul file. Everything is done now the only problem I have is to get a tooltip when I move the mouse on a datapoint. I am using imagemap and its a simple XY line chart.
Here is my code:
Zul code:
<imagemap id="myimage">
</imagemap>
Javacode:
........
JFreeChart chart = trackerGraph.createChart(chartData, addEditTrackerVO.isTimeFieldVisible());
XYLineAndShapeRenderer r = new XYLineAndShapeRenderer();
r.setToolTipGenerator(new StandardXYToolTipGenerator());
chart.getXYPlot().setRenderer(r);
trackerGraph.createGraph(myimage, chart);
..........

public void createGraph(Imagemap myimage, JFreeChart chart){
try {
ChartRenderingInfo info = new ChartRenderingInfo();
BufferedImage bi = chart.createBufferedImage(600, 400, BufferedImage.TRANSLUCENT, info);

//BufferedImage bi = chart.createBufferedImage(500, 300, BufferedImage.TRANSLUCENT , null);
byte[] bytes = EncoderUtil.encode(bi, ImageFormat.PNG, true);

AImage image = new AImage("Line Chart", bytes);
myimage.setContent(image);
}catch (Exception ex){
LOG.info("Exception!! while creating jfreeChart. The exception is: "+ex.getMessage());
}

}

public JFreeChart createChart(ChartData chartData , boolean isTimeFieldVisible) {
XYDataset dataset = createDataset(chartData, isTimeFieldVisible);
Plot plot = createPlot(chartData, dataset, isTimeFieldVisible);

return new JFreeChart(chartData.getTitle(), JFreeChart.DEFAULT_TITLE_FONT, plot, createLegend(chartData));
}

public void writeChart(OutputStream out, JFreeChart chart, ChartData chartData) throws Exception {
ChartUtilities.writeChartAsPNG(out, chart, chartData.getWidth(), chartData.getHeight());
}

What am I missing? How can I get a tooltip when I move my mouse over a datapoint on the graph?

I will really appreciate if you could provide some help.

Regards,

Kazim