[jCharts-users] Switched from jCharts.0.7.5 to krysalis-jCharts-1.0.0-alpha-1

[Jiang, X. <jon...@pi...>]

Hi,

I just switched from jCharts.0.7.5 to krysalis-jCharts-1.0.0-alpha-1. My ap=
p builds fine, but got a run-time error as follows:

Warning: legend shape is null
java.lang.NullPointerException
        at org.krysalis.jcharts.Legend.calculateDrawingValues(Unknown Sourc=
e)
        at org.krysalis.jcharts.Legend.computeLegendXY(Unknown Source)
        at org.krysalis.jcharts.axisChart.AxisChart.renderChart(Unknown Sou=
rce)
        at org.krysalis.jcharts.Chart.render(Unknown Source)
        ...

I didn't make any change to my source code. What else should I do?=20
Here's my source code:

    /**
     * Plot the time series data as line chart.=20
     */
    public int plot() throws ChartDataException, PropertyException {
        ...
        String xAxisTitle=3D null, yAxisTitle=3D null;
        dataSeries =3D new DataSeries( xAxisLabels, xAxisTitle, yAxisTitle,=
 getChartTitle() );
        LineChartProperties lineChartProperties=3D new LineChartProperties(=
 strokes, shapes );

        AxisChartDataSet axisChartDataSet =3D new AxisChartDataSet(data,leg=
endLabels,paints,ChartType.LINE,lineChartProperties);
        dataSeries.addIAxisPlotDataSet(axisChartDataSet);

        chartProperties=3D new ChartProperties();
        axisProperties=3D new AxisProperties();
        legendProperties=3D new LegendProperties();
        ChartStroke xAxisGridLines=3D new ChartStroke( new BasicStroke( 1.0=
f,BasicStroke.CAP_ROUND,BasicStroke.JOIN_ROUND,1f,new float[] {2f},0f ),Col=
or.lightGray);
        axisProperties.getXAxisProperties().setGridLineChartStroke( xAxisGr=
idLines );
        axisProperties.getXAxisProperties().setShowGridLines( AxisTypePrope=
rties.GRID_LINES_ONLY_WITH_LABELS );

        DataAxisProperties yAxis =3D (DataAxisProperties) axisProperties.ge=
tYAxisProperties();
        yAxis.setGridLineChartStroke( xAxisGridLines );
        yAxis.setShowGridLines( AxisTypeProperties.GRID_LINES_ONLY_WITH_LAB=
ELS );
        yAxis.setNumItems(yNumItems);
        yAxis.setRoundToNearest(roundToNearest);

        UserDefinedScaleCalculator u=3D new UserDefinedScaleCalculator(yMin=
, yIncrement);
        yAxis.setScaleCalculator( u );

        yAxisMinWidth =3D getYLabelMinWidth(yAxis);

        //repaint();

        return PTError.PMPT_ERROR_SUCCESS;
    }

    public void paint(Graphics g) {
            Graphics plotGraphics =3D g.create(yAxisOffset,0,dim.width-yAxi=
sOffset,dim.height);
            try {
                Graphics2D g2d =3D (Graphics2D) plotGraphics;
                AxisChart axisChart=3D new AxisChart(dataSeries,=20
                                                   chartProperties,=20
                                                   axisProperties,=20
                                                   legendProperties, dim.wi=
dth-yAxisOffset, dim.height );              =20
                axisChart.setGraphics2D(g2d);
                axisChart.render();
            }
            catch( ChartDataException chartDataException )
            {
                chartDataException.printStackTrace();
            }
            catch( PropertyException propertyException ) {
                propertyException.printStackTrace();
            }
    }


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