oops, mixed up the jpg and png encoders. Obviously in the below example
the content type should be: "image/png" and to avoid confusion rename
the JPEGEncoder to PNGEncoder.
cheers, Joost
Joost Schouten (ml) wrote:
Hi,
Don't know about the chenille options, but creating one with
JFreeChart [1] and returning a StreamResponse is fairly
straightforward [2].
cheers,
Joost
[1] http://www.jfree.org/jfreechart/api/javadoc/index.html
[2]
private SunPNGEncoderAdapter JPEGEncoder = new SunPNGEncoderAdapter();
@Inject
private ComponentResources resources;
@OnEvent(value = "showGraph")
private Object showGraph() throws Exception {
PieDataset pieDataSet = .....;
JFreeChart chart = ChartFactory.createPieChart("title",
pieDataSet, true, false, false);
BufferedImage chartImage =
chart.createBufferedImage(chartWidth, chartHeight);
final ByteArrayInputStream output = new
ByteArrayInputStream(JPEGEncoder.encode(chartImage));
final StreamResponse response = new StreamResponse() {
public String getContentType() {
return "image/jpg";
}
public InputStream getStream() throws IOException {
try {
return output;
} catch (Exception e) {
log.error(e);
throw new IOException(e.getMessage());
}
}
public void prepareResponse(Response response) {
}
};
return response;
}
public String getGraphUrl() {
Link link = resources.createEventLink("showGraph");
return link.toAbsoluteURI();
}
------------------in your *.tml -------------------
<img src="${graphUrl}"/>
Fermin Da Costa Gomez wrote:
Hi,
Having already wasted a couple of hours on this i thought i would put
the
question to the list.
Does anybody have a snip that creates a pie chart?
With chenille i can get the line and bar but a proper pie is, so far,
still
eluding me .. :-(
Tia,
Fermin DCG
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