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Re: [birt-news] strange error when using chart engine 
Hi again,

I forgot, I'm using the following versions:
org.eclipse.birt.chart.device.swt_2.1.1.v20070205-1728.jar
org.eclipse.birt.chart.engine_2.1.2.v20070205-1728.jar
org.eclipse.birt.chart.engine.extension_2.1.2.v20070205-1728.jar

The DeviceRenderer is obtained by:
final PluginSettings ps = PluginSettings.instance();
try {
	deviceRenderer = ps.getDevice("dv.SWT");
} catch (ChartException pex) {
	logger.error("Couldn't initialize renderer.", pex);
}

Best regards,

Abid

Abid Hussain schrieb:

Hi everybody,

I'm using the chart engine embedded in an eclipse plugin.
In this I create a line chart (ChartWithAxes) and I encounter a quite strange behaviour. When the chart data values in the y-axis approximate, the chart generation freezes (which means it uses almost 100% of the CPU). 

I generate the data values from Points, like:
Point point1 = new Point(1179839372937l, 346.0);
pointList.add(point1);
Point point2 = new Point(1279839383156l, 340.0);
pointList.add(point2);
I can reproduce this error. When I decrease the second value of point2 to 330.0 (and below) everything works fine. The same is when I put the second value to 350.0 it crashes, whereas with 360.0 (and above) it works. 

Anybody got an idea what to do?

Best regards,

Abid

The Chart is generated by this code:
public static final Chart createLineChart() {

    ChartWithAxes lineChart = ChartWithAxesImpl.create();
    // Plot
    lineChart.getBlock().setBackground(ColorDefinitionImpl.WHITE());
    Plot p = lineChart.getPlot();
    p.getClientArea().setBackground(
            ColorDefinitionImpl.create(255, 255, 225));

    // Title
lineChart.getTitle().getLabel().getCaption().setValue("History");

    // Legend
    lineChart.getLegend().setVisible(false);

    // X-Axis
    Axis xAxisPrimary = lineChart.getPrimaryBaseAxes()[0];
    // xAxisPrimary.setType(AxisType.TEXT_LITERAL);
        xAxisPrimary.getMajorGrid().setTickStyle(TickStyle.BELOW_LITERAL);
    // xAxisPrimary.getMajorGrid().setTickCount(3);
        xAxisPrimary.getOrigin().setType(IntersectionType.VALUE_LITERAL);
    xAxisPrimary.getTitle().getCaption().setValue("Time");
    xAxisPrimary.getTitle().setVisible(true);

    // Y-Axis
    Axis yAxisPrimary = lineChart.getPrimaryOrthogonalAxis(xAxisPrimary);
        yAxisPrimary.getMajorGrid().setTickStyle(TickStyle.LEFT_LITERAL);
        yAxisPrimary.getOrigin().setType(IntersectionType.VALUE_LITERAL);
// yAxisPrimary.getTitle().getCaption().setValue(history.getModule()); 
        yAxisPrimary.getTitle().getCaption().setValue("Battery");
    yAxisPrimary.getTitle().setVisible(true);

    Collection<Point> pointList = new ArrayList<Point>();
    Point point1 = new Point(1179839372937l, 346.0);
    pointList.add(point1);
    Point point2 = new Point(1279839383156l, 340.0);
    pointList.add(point2);

    String[] xValues = new String[pointList.size()];
    double[] yValues = new double[pointList.size()];

    int j = 0;
    for (Point point : pointList) {
        xValues[j] = DateFormat.getDateTimeInstance().format(
                new Date(point.getDate()));
        yValues[j] = point.getValue();
        j++;
    }

    logger.debug("Values (" + pointList + ") initialized.");

    // Data Set
    TextDataSet xDataSet = TextDataSetImpl.create(xValues);
    NumberDataSet yDataSet = NumberDataSetImpl.create(yValues);

    // X-Series
    Series xSeries = SeriesImpl.create();
    xSeries.setDataSet(xDataSet);
    SeriesDefinition xSeriesDefinition = SeriesDefinitionImpl.create();
        xAxisPrimary.getSeriesDefinitions().add(xSeriesDefinition);
    xSeriesDefinition.getSeries().add(xSeries);

    // Y-Series
    LineSeries ySeries = (LineSeries) LineSeriesImpl.create();
    ySeries.setDataSet(yDataSet);
        ySeries.getLineAttributes().setColor(ColorDefinitionImpl.CREAM());
    for (int i = 0; i < ySeries.getMarkers().size(); i++) {
        ((Marker) ySeries.getMarkers().get(i))
                .setType(MarkerType.RECTANGLE_LITERAL);
    }
    ySeries.getLabel().setVisible(true);

    SeriesDefinition ySeriesDefinition = SeriesDefinitionImpl.create();
    ySeriesDefinition.getSeriesPalette().update(-2);
        yAxisPrimary.getSeriesDefinitions().add(ySeriesDefinition);
    ySeriesDefinition.getSeries().add(ySeries);
        return lineChart;
}
The Chart is painted by this code (The line marked with '-->' lets the application crash): 

public void paintControl(PaintEvent e) {
Chart chart = createLineChart(); Rectangle rectangle = this.getClientArea(); 
    Image imgChart = new Image(this.getDisplay(), rectangle);
    GC gcImage = new GC(imgChart);
deviceRenderer.setProperty(IDeviceRenderer.GRAPHICS_CONTEXT, 
                    gcImage);

    Bounds bounds = BoundsImpl.create(0, 0, rectangle.width,
                    rectangle.height);
    bounds.scale(72d / deviceRenderer.getDisplayServer()
                    .getDpiResolution());
Generator generator = Generator.instance(); try {
--> gcs = generator.build(deviceRenderer.getDisplayServer(), chart, bounds, null, null, null); generator.render(deviceRenderer, gcs); GC gc = e.gc; 
        gc.drawImage(imgChart, rectangle.x, rectangle.y);
} catch (ChartException gex) { 
        logger.error("Couldn't create chart.", gex);
    }
}




--

Abid Hussain
Mail: abid.hussain@xxxxxxxxx
Web: http://www.abid76.de

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