[BIRT 2.3.2 (StandAlone)]"Jumping" problem ?

Question

Hi there, Here's the fact : I made a tiny app which consist of a table related to a bar chart (a birt one ... of course), when I modify my table values it automaticaly alter my chart (like Excel but less fancy) ...

Anyway everything works fine ... BUT when I want to make my chart interactive in order to show tooltips (for example) I inform naturaly my IDeviceRenderer whit the following command idr.setProperty( IDeviceRenderer.UPDATE_NOTIFIER, this ); but doing so brings an error when (much later) my code come to gr.render(idr, gr.build(idr.getDisplayServer(), this.chart, bo, vroum,null)); (Which have never failed before) ...

I feel lost ...

ps: The error I get are that I get no bars to my chart and receive the following error message : org.eclipse.birt.chart.exception.ChartException at org.eclipse.birt.chart.factory.Generator.render(Generator.java:1373) at clickable.chart.ClickableProto.paintControl(ClickableProto.java:520) at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:217) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1003) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1027) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1012) at org.eclipse.swt.widgets.Composite.WM_PAINT(Composite.java:1424) at org.eclipse.swt.widgets.Control.windowProc(Control.java:3842) at org.eclipse.swt.widgets.Canvas.windowProc(Canvas.java:337) at org.eclipse.swt.widgets.Display.windowProc(Display.java:4541) at org.eclipse.swt.internal.win32.OS.DispatchMessageW(Native Method) at org.eclipse.swt.internal.win32.OS.DispatchMessage(OS.java:2371) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3420) at clickable.chart.ClickableProto.main(ClickableProto.java:151) Caused by: java.lang.NullPointerException at org.eclipse.birt.chart.render.InteractiveRenderer.isColoredByCategories(InteractiveRenderer.java:197) at org.eclipse.birt.chart.render.InteractiveRenderer.getSource(InteractiveRenderer.java:161) at org.eclipse.birt.chart.render.InteractiveRenderer.modifyEvent(InteractiveRenderer.java:116) at org.eclipse.birt.chart.device.swt.SwtRendererImpl.fillPolygon(SwtRendererImpl.java:502) at org.eclipse.birt.chart.event.PolygonRenderEvent.fill(PolygonRenderEvent.java:156) at org.eclipse.birt.chart.render.DeferredCache.flushPlanes(DeferredCache.java:499) at org.eclipse.birt.chart.render.DeferredCache.flushOptions(DeferredCache.java:271) at org.eclipse.birt.chart.render.DeferredCacheManager.flushOptions(DeferredCacheManager.java:165) at org.eclipse.birt.chart.render.AxesRenderer.flushClipping(AxesRenderer.java:3416) at org.eclipse.birt.chart.render.AxesRenderer.restoreClipping(AxesRenderer.java:3401) at org.eclipse.birt.chart.render.Bar.renderSeries(Bar.java:1533) at org.eclipse.birt.chart.render.AxesRenderer.renderPlot(AxesRenderer.java:2181) at org.eclipse.birt.chart.render.AxesRenderer.render(AxesRenderer.java:314) at org.eclipse.birt.chart.factory.Generator.render(Generator.java:1368) ... 14 more

I am open to any idea !

Answer 1

Finally I managed it on my own ...

So here are some common mistakes not to make when you make a chart on BIRT and wnat it to be interactive ...

1 Implement barely anything which need to be overriden

        I personnaly forgot to override

getDesignTimeModel()

and

getRunTimeModel()

comming with the ICallBackNotifier implementation ...

2 Do not nest your chart (or be prepared to nest most of your methods too)

        I had my chart not directly on my shell but nested in a bunch of composites widgets, canvas and such ... Therefore my canvas where hidding my shell which was the only one able to react in the way I wanted to my mouse controller. (Funny fact : I figured this all out when I (for no reason) tried to drag a small part of my shell which was not overlapped by the chart and drop it on my bars ... There the tooltip poped ... ^^ Funny way to understand how things work :p)

3 Do not be me ...

        It is to much work and pain for a barely acceptable result ;p

Hope this help, dont hesitate to mail me if you face the same probleme, I'd be glad to help as much as I can ^^