RE: [jCharts-users] getting started

[Christian C. <chr...@gr...>]

For what its worth, I now have a stack trace...

java.lang.NullPointerException
        at org.jCharts.Chart.render(Chart.java:156)
        at
org.jCharts.encoders.BinaryEncoderUtil.render(BinaryEncoderUtil.java:90)
        at org.jCharts.encoders.PNGEncoder.encode(PNGEncoder.java:91)
        at
org.jCharts.encoders.ServletEncoderHelper.encodePNG(ServletEncoderHelper.jav
a:137)

Which traces to this:

    this.graphics2D.setPaint( this.chartProperties.getBackgroundPaint() );

Suggestions?

Christian
----------------------------------------------
Christian Cryder
Internet Architect, ATMReports.com
Project Chair, BarracudaMVC - http://barracudamvc.org
----------------------------------------------
"Coffee? I could quit anytime, just not today"


> -----Original Message-----
> From: jch...@li...
> [mailto:jch...@li...]On Behalf Of Christian
> Cryder
> Sent: Tuesday, October 14, 2003 6:59 PM
> To: jCharts-users
> Subject: [jCharts-users] getting started
>
>
> Hi folks,
>
> I'm obviously doing something stupid, so maybe you can help me...
> Here's my
> code snippet, taken from the samples:
> ----------------------------------
> BarChartProperties barChartProperties = null;
> LegendProperties legendProperties = null;
> AxisProperties axisProperties = null;
> ChartProperties chartProperties = null;
> int width = 550;
> int height = 360;
>
> try {
>     String[] xAxisLabels = {"1995", "1996", "1997", "1998",
> "1999", "2000",
> "2001", "2002", "2003", "2004"};
>     String xAxisTitle = "Years";
>     String yAxisTitle = "Problems";
>     String title = "Micro$oft At Work";
>     IAxisDataSeries dataSeries = new DataSeries( xAxisLabels, xAxisTitle,
> yAxisTitle, title );
>
>     double[][] data = new double[][]{{1500, 6880, 4510, 2600, 1200, 1580,
> 8000, 4555, 4000, 6120}};
>     String[] legendLabels = {"Bugs"};
>     Paint[] paints = new Paint[]{Color.blue.darker()};
>     dataSeries.addIAxisPlotDataSet( new AxisChartDataSet( data,
> legendLabels, paints, ChartType.BAR, barChartProperties ) );
>     AxisChart axisChart = new AxisChart( dataSeries, chartProperties,
> axisProperties, legendProperties, width, height);
>
>     ...
>     ServletEncoderHelper.encodePNG(axisChart, httpServletResponse);
>     ...
>
> catch(ChartDataException chartDataException) {
>     chartDataException.printStackTrace();
> }
> ----------------------------------
>
> Notice that I am _not_ calling renderWithImageMap(),
> getImageMap(), etc the
> way the sample is. Instead, I'm trying to use the chart normally,
> just as an
> image.
>
> The problem occurs within encodePNG()...it basically throws a null pointer
> exception, and because the code was apparently compiled without line
> numbers, I don't get a whole lot for debugging...
>
> Now, I tried a simple pie chart example, and that _did_ work...so
> obviously,
> I am doing something specifically wrong here. Does anyone have
> any ideas? Or
> do I have to go build the project from source in order to get line numbers
> and then track it down from there.
>
> Any suggestions would be greatly appreciated...
>
> tia,
> Christian
> ----------------------------------------------
> Christian Cryder
> Internet Architect, ATMReports.com
> Project Chair, BarracudaMVC - http://barracudamvc.org
> ----------------------------------------------
> "Coffee? I could quit anytime, just not today"
>
>
>
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