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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