Seam Framework - How to display a gantt chart with Seam??

I am working on a scheduling application, and I am using Seam for my first time, i want to display a gantt chart but Seam supports only three chart types of the jfreechart library.... I tried to use tomahawk but coudn't integrate it successfully....

Is there any way for doing that???

I may use a scheduel component or a calendar widget, not necessary a gantt chart, what is important for me is to display something that could organize my events.......

PLZ help...

Thnk u

2 Replies:

Re: How to display a gantt chart with Seam??

04. Jun 2008, 21:12 CET | Link

Javier Ferrero

Try using jfreechart directly. For instance:

SFSB:


@Name("chartprocesser")
@Stateful
@Scope(ScopeType.EVENT)
public class ChartProcesserBean implements ChartProcesserLocal {
    
    
    @Remove @Destroy
    public void remove(){}
    
    private byte[] chart; // chart image (.png) as a byte array
    
    
    @Factory(value="chart")
    public void createChart() {
        
        
        IntervalBarChartDemo1 sample = new IntervalBarChartDemo1();
        JFreeChart chart = sample.getOverlaidChart();
        
        try{
            this.chart = ChartUtilities.encodeAsPNG(chart.createBufferedImage(800, 400));
        } catch (IOException e){
            e.printStackTrace();
        }
        
    }

IntervalBarChartDemo1:

 
public JFreeChart getChart() {
        DefaultIntervalCategoryDataset data = null;
        final Number[][] lows = {{10000, 18000, 26000, 34000, 42000},{1000, 1800, 2600, 3400, 4200}};
        final Number[][] highs = {{20000, 28000, 36000, 44000, 52000},{20000, 28000, 36000, 44000, 52000}};
        data = new DefaultIntervalCategoryDataset(SERIES, lows, highs);
        data.setCategoryKeys(CATEGORIES);
        //data.setSeriesKeys(SERIES);
        final String title = "Salary Comparaison";
        final String xTitle = "Bands";
        final String yTitle = "Salary";
        final CategoryAxis xAxis = new CategoryAxis(xTitle);
        xAxis.setLabelFont(titleFont);
        xAxis.setTickLabelFont(labelFont);
        xAxis.setTickMarksVisible(false);
        xAxis.setCategoryMargin(0.1);
        
        
        final NumberAxis yAxis = new NumberAxis(yTitle);
        yAxis.setLabelFont(titleFont);
        yAxis.setTickLabelFont(labelFont);
        yAxis.setRange(0, 60000);
        //final DecimalFormat formatter = new DecimalFormat("0.##%");
        yAxis.setTickUnit(new NumberTickUnit(5000));
        
        final IntervalBarRenderer renderer = new IntervalBarRenderer();
        renderer.setSeriesPaint(0, new Color(51, 102, 153));
        //renderer.setLabelGenerator(new IntervalCategoryLabelGenerator());
        renderer.setItemLabelsVisible(true);
        renderer.setItemMargin(0.04);
        
        renderer.setItemLabelPaint(Color.white);
        final ItemLabelPosition p = new ItemLabelPosition(
                ItemLabelAnchor.CENTER, TextAnchor.CENTER
                );
        renderer.setPositiveItemLabelPosition(p);
        
        IntervalCategoryItemLabelGenerator generator = new IntervalCategoryItemLabelGenerator("{3}{4}", new DecimalFormat());
        renderer.setItemLabelGenerator(generator);
        
        
        final CategoryPlot plot = new CategoryPlot(data, xAxis, yAxis, renderer);
        plot.setBackgroundPaint(Color.lightGray);
        plot.setOutlinePaint(Color.white);
        plot.setOrientation(PlotOrientation.VERTICAL);
        plot.setRangeGridlinePaint(Color.white);
        
        /*
        CategoryItemLabelGenerator generator = new StandardCategoryItemLabelGenerator(
                "{2}", new DecimalFormat("0.00"));
        renderer.setItemLabelGenerator(generator);
         **/
        this.chart = new JFreeChart(title, titleFont, plot, false);
        this.chart.setBackgroundPaint(Color.white);
        return this.chart;
    }

and the XHTML:



<s:graphicImage value="#{chartprocesser.chart}" />

Just change IntervalBarChartDemo1 to create your chart.

Regards

Re: How to display a gantt chart with Seam??

21. Oct 2008, 11:23 CET | Link

David Beaumont

Dear Javier,

I am trying to draw a Gantt chart and have been following your guide and also that at: http://www.java2s.com/Code/Java/Chart/JFreeChartGanttDemo1.htm

My code looks like:


public byte[] getFundingGanttChart() {
		if(!(null == this.fundingGanttChart)) return fundingGanttChart;
		Map<OrganisationNameCcr, TaskSeries> funders = new HashMap<OrganisationNameCcr, TaskSeries>();
		// Strong typing - I've heard of it
		for(Object obj: this.getAllFundings()) {
			Object[] objArray = (Object[]) obj;
			OrganisationNameCcr funderName = (OrganisationNameCcr) objArray[2];
			ProvisionFunding funding = (ProvisionFunding) objArray[0];
			if(!(null == funders.get(funderName))) {
				// We've already created a TaskSeries for this funder, so retrieve it.
				funders.get(funderName).add(new Task(funding.getFunding().toString(), funding.getStart(), funding.getFinish()));
			} else {
				TaskSeries series = new TaskSeries(funderName.getName());
				series.add(new Task(funding.getFunding().toString(), funding.getStart(), funding.getFinish()));
				funders.put(funderName, series);
			}
		}
		TaskSeriesCollection seriesCollection = new TaskSeriesCollection();
		for(TaskSeries series: funders.values()) {
			seriesCollection.add(series);
		}
		// FIXME - line below ought to accept the seriesCollection as argument but it fails on deployment
		JFreeChart chart = ChartFactory.createGanttChart("Funding History", "Funding", "Date", seriesCollection, true, true, false);
		chart.setBorderVisible(true);
		try {
			this.fundingGanttChart = ChartUtilities.encodeAsPNG(chart.createBufferedImage(600, 400));
		} catch (IOException e) {
			e.printStackTrace();
		}
		return this.fundingGanttChart;
	}

Eclipse seems to think this is ok, but when I deploy the Ear to JBoss 4.2 I get the following stack trace:


java.lang.NoClassDefFoundError: org/jfree/data/category/IntervalCategoryDataset
	at java.lang.Class.getDeclaredMethods0(Native Method)
	...

If I change nothing, except for to give null as a parameter to ChartFactory.createGanttChart(), a chart with no data is drawn. IntervalCategoryDataset is an interface, which has a sub-interface GanttCategoryDataset which is implemented by TaskSeriesCollection which I am using. If I create another TaskSeriesCollection:


TaskSeriesCollection seriesCollection2 = null;

And pass that null collection to ChartFactory.createGanttChart(), the application deploys fine (though obviously shows a blank chart).

What am I doing wrong? Am I simply misunderstanding how interfaces work?

Thanks,
Dave