Slightly different way that I have used is:
ByteArrayOutputStream baos = new ByteArrayOutputStream(bufSize);
ImageIO.write(bufImg, DEFAULT_IMAGE_TYPE, baos);
imageData = new NSData(baos.toByteArray());
where DEFAULT_IMAGE_TYPE is "png" or image type defined, bufImg is
BufferedImage. That should replace the last two line of your code.
Cheers
Cheong Hee
----- Original Message -----
From: Michael Sharp
To: Baiss Eric Magnusson
Cc: WebObjectsDev
Sent: Thursday, January 07, 2010 9:18 AM
Subject: Re: from JFreeChart (BufferedImage_) to NSData_
JFreeChart lineChart = createChart( dataSet );
ByteArrayOutputStream stream = new ByteArrayOutputStream();
ChartUtilities.writeChartAsPNG(stream, lineChart, 500, 300);
return new NSData(stream.toByteArray());
Alternatively you can use writeChartAsJPEG.
Or let ERPlot deal with it by using the chart binding:
MyChart : ERPCategoryChart {
chart = lineChart;
width = 500;
height = 300;
}
Sharpy..
On 07/01/2010, at 9:54 AM, Baiss Eric Magnusson wrote:
In the below method how do I get the return stuff from JFreeChart to be put
into a NSData which is bound to the <data> binding of a WOImage, which is the
way I've see to use for the Line Chart I'm creating. It seems that JFreeChart
uses .png by default, which is good n'est-ce pas?
public NSData lineChartJFree() {
XYSeriesCollection dataSet = createDataset();
JFreeChart lineChart = createChart( dataSet );
BufferedImage bufFromJFree = lineChart.createBufferedImage( 800, 500 );
Raster rast = bufFromJFree.getData();
return new NSData( rast.??? );
}
Baiss -
I looked at this package and, frankly, it does not make that much sense
to me either. But then I find that when Anjo puts things in, be can often be
... concise, shall we say ... in how he documents things. I could probably buy
and read through the doc for JFreeChart, but I have not done that yet.
I put a new Example project in Wonder. It is
Examples/Misc/ERComponentTour. There is, after all, nothing analogous to the
D2WComponentTour example and there are lots of non-D2W components in Wonder.
The first (and presently only) page in that app is for "ERPCategoryChart &
ERPPieChart." And there is no ERPPieChart yet. And the examples there are
probably not the smartest. It certainly seems that for the AreaChart and
WaterfallChart, this dataset does not make sense. But this is the first
version, so it is obviously better than what was there before. And anyone who
wants to show better examples of these components is certainly welcome to do so.
This example does show a minimal usage of the ERPCategoryChart. Let me
know if this helps at all. Or, if it does not, what would be needed to make it
make more sense? Let me know what you end up figuring out and I can probably
use that to improve the example.
cheers - ray
----
Baiss Eric Magnusson
http://www.CascadeWebDesign.com
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