This is my sample code to to show jfreechart tooltip on the image.
The key is to override onComponentTagBody() and use
replaceComponentTagBody().
the parameter imageMapId used in ChartUtilities.getImageMap(imageMapId,
info); should also
markded in html file ,for example :imageMapId="tooltip",then </img>
remember that the </img> tag must leave open tag,not close tag( ,
else replaceComponentTagBody() will not work.
Just post my tried code to share.
There should be better way to tune the performance.
--source code here--
public class JFreeChartImage extends NonCachingImage {
private String imageMapId;
private int width;
private int height;
private JFreeChart chart;
private ChartRenderingInfo info = new ChartRenderingInfo(
new StandardEntityCollection());
public JFreeChartImage(String id, String imageMapId,
int width, int height) {
// super(id, new Model(defaultImage));
super(id);
this.imageMapId = imageMapId;
this.width = width;
this.height = height;
}
@Override
protected Resource getImageResource() {
Resource imageResource = null;
final JFreeChart chart = getChart();
imageResource = new DynamicImageResource() {
@Override
protected byte[] getImageData() {
ByteArrayOutputStream stream = new
ByteArrayOutputStream();
try {
if (chart != null) {
info.clear();
ChartUtilities.writeChartAsPNG(stream, chart, width,
height,
info);
}
} catch (IOException e) {
System.out.println("IOException: " +
e.getMessage());
}
return stream.toByteArray();
}
}; return imageResource;
}
@Override
protected void onComponentTagBody(MarkupStream markupStream,
ComponentTag openTag) {
JFreeChart chart = getChart();
if (chart == null)
return;
ByteArrayOutputStream stream = new ByteArrayOutputStream();
try {
if (chart != null) {
info.clear();
ChartUtilities.writeChartAsPNG(stream,
chart, width, height,
info);
}
} catch (IOException e) {
System.out.println("IOException: " +
e.getMessage());
}
System.out.println(ChartUtilities.getImageMap(imageMapId,
info));
replaceComponentTagBody(markupStream, openTag,
ChartUtilities
.getImageMap(imageMapId, info));
}
public JFreeChart getChart() {
return chart;
}
public void setChart(JFreeChart chart) {
this.chart = chart;
}
}
--
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