The jfreechart book is well worth the expense. And it is supporting
the efforts of the developers. Note that it is not subject to
per-user license fees or anything, so it is an annual fee (assuming
you care to update to the latest docs every year) that gives you
unlimited use, including source code to all of the demo apps, which is
invaluable when working with something like jfreechart.
--sam
On 1/26/07, Daniel Jue <[EMAIL PROTECTED]> wrote:
I've seen the light. =)
I won't jump to javascript charting just yet--although it looks nice
and interaction is great, I don't have the time and it's not required.
Besides, the feeling I get is that I'd probably want to upgrade to
Tap 4.1.something before diving into dojo integration.
It was very easy to switch over to JFreeCharts, although I wish there
were more open source examples besides the pay-for user guide they
offer.
In fact in less than a couple hours I had abstracted my ChartService
to act on a wrapper I called "IChart", which can wrap whatever
charting tool I choose, as long as the chart rendering feature accepts
an output stream.
The IChart class has a method like this that passes render control to
the charting tool it wraps:
public static void writeChartAsJPEG(OutputStream out, IChart chart)
throws IOException {
ChartUtilities.writeChartAsJPEG(out, chart.getChart(),
chart.getWidth(), chart.getHeight());
}
and the ChartService calls this and only has to supply the Chart and
the OutputStream.
The ChartService also reads in height and width from the html (ognl parameters).
Dan
On 1/25/07, Peter Stavrinides <[EMAIL PROTECTED]> wrote:
> We use JFreeChart, for both J2EE and Tapestry applications, and I must
> say its really simple to use. getting it to work in Tapestry took me a
> few days though because I didn't know the framework very well, in the
> end it needed a ridiculous amount of code (4 lines or so). I used the
> outputstream writer. This snippet is from my IEngineService service()
> method:
>
> JFreeChart freeChart = chart;
> WebResponse response = cycle.getInfrastructure().getResponse();
> OutputStream out = response.getOutputStream(new
> ContentType("image/jpeg"));
> ChartUtilities.writeChartAsPNG(out, freeChart, width, 300);
>
>
> Thiago H de Paula Figueiredo wrote:
> > On Wed, 24 Jan 2007 20:03:22 -0200, Martin Strand
> > <[EMAIL PROTECTED]> wrote:
> >
> >> I haven't used it myself but jfreechart appears to be active:
> >> http://www.jfree.org/jfreechart/
> >
> > I have used JFreeChart in some projects and it is very good. It
> > supports many chart types (including some you probably never heard of
> > before :), it's open source, it's relatively simple to use, and it's
> > very powerful. If there isn't any JFreeChart-Tapestry integration
> > written yet, it's about time! :) Unfortunately, i don't have the spare
> > time needed now. :(
> >
> > There's Cewolf, a JFreeChart taglib I already used. Maybe we could
> > take some ideas from it.
> >
> > --
> > hasta la vista!!!
> >
> > |8) |8p |8) |8p |8) |8p |8) |8p |8) |8p |8) |8p |8) |8p |8) |8p |8) |8p
> >
> > thiago h. de paula figueiredo
> > mestre em ciência da computação pelo dcc/ufmg
> > ate' porque bobagem pouca e' bobagem . . .
> >
> > ---------------------------------------------------------------------
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> >
>
> --
> Peter Stavrinides
> Albourne Partners (Cyprus) Ltd
> Tel: +357 22 750652
>
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