Hi, Chartcreator uses either a phaselistener or a servlet to generate the charts. It can be configured by a context param.
First it gets the datasource and chart parameters, puts them to session and renders an img tag like; <img src="pagename.jsf?chartId=myChart" /> and then in this case faces lifecycle begins, phaselistener renders the image and stops it after restore view. Servlet pretty much does the same. Regards, Cagatay On 6/6/07, Jochen Zink <[EMAIL PROTECTED]> wrote:
Thanks for the fast reply. It is not possible to use tomahawk or the chartcreator comp in my environment. So, I hope there is a solution without using special components. I will take a look to the source code of chartcreator and try to find a solution. If anyone know how it works, please let me know. :) Thanks a lot! > -----Ursprüngliche Nachricht----- > Von: "MyFaces Discussion" <users@myfaces.apache.org> > Gesendet: 06.06.07 15:52:40 > An: MyFaces Discussion <users@myfaces.apache.org> > Betreff: Re: how to create dynamic grahpics with JFreeChart and myfaces? > > See JSF Chart Creator [1], it uses JFreeChart 1.0.5. > > [1] http://jsf-comp.sourceforge.net/components/chartcreator/index.html > <http://www.jfree.org/jfreechart> > > Glauco P. Gomes > > Mario Ivankovits escreveu: > > Hi! > > > >> I want to show a BufferedImage on a JSF-generated page. In my case, this Image is generated by the JFreeChart[1] library. Now my question: > >> What must I do, that I can show this image as a graphic on a JSF Page? > >> > >> > > Hehe - I had the same problem yesterday. > > > > One solution is the latest tomahawk-sandbox and its graphicsImageDynamic > > component. > > There you can do something like: > > > > <s:graphicsImageDynamic value="#{backingBean.chartRenderer}" where the > > method signature of chartRenderer is > > > > public ImageRenderer getChartRenderer() > > { > > } > > > > To fulfill the ImageRenderer requirements is easy, just create a png/gif > > byte array out of the chart and write it to the ResponseStream where > > requested by the ImageRenderer Interface. > > The trick is, that you have to find some way to push down informations > > to the managed bean. > > > > If you do not use MyFaces Orchestra (or Seam) which provides a > > conversation scope, the easiest way is to put the backingBean into the > > session scope. > > > > > > Another way is to use s:graphicsImageDynamic > > imageRenderer="#{backingBean.chartImageRenderer}". Then the method > > signature of chartImageRenderer is > > public String getChartImageRenderer() where you have to provide a FQN of > > a class implementing the ImageRenderer interface. > > It should work then to add f:param tags within the graphicsImageDynamic > > component to pass down some informations to the renderer. > > Though, I do not know much more about that way ... I am a MyFaces > > Orchestra user ;-) > > > > Ciao, > > Mario > > > > > > > > _______________________________________________________________ SMS schreiben mit WEB.DE FreeMail - einfach, schnell und kostenguenstig. Jetzt gleich testen! http://f.web.de/?mc=021192
