Hi,
I need to build a family tree maker based on web application using java,
would you help me and tell me the steps please ? I really appreciate if you
would help me to kick start this application.
Alex Tian wrote:
>
> hi, everyone, I know it's gonna be a lenthy statement below, but I
> desperately need help...
>
> my task actually is to build a "family tree" web application, for
> simplicity, e.g. User enters his/her name and his relatives'names (e.g.
> his parents' names and children's names ) and sumbit the form (triggers a
> listener in that page's .java file). What I do is generate a tree-like
> image to show the relations among them (use only rectangles with lines to
> connect them, on each rectangle write proper family member's name which
> the user entered) and display it on the page and use image map to make
> those rectangles on the image clickable (e.g. user can link to a person's
> detail page), because the I don't know what relations will be among those
> family members and how many names the user will enter, so I cannot
> pre-define the coords attribute and the number of <area> tags for "image
> map".
>
> As I said in the first post, I managed to generate the buffered image and
> display it on the page, I used 2 classes and 1 interface exactly as Chart
> example in Workbench example (IChartProvider.java, ChartService.java,
> ChartAsset.java). and I used DirectArea custom component in Virtual
> Library example implemented image map on this newly created image, the
> DirectArea custom component in Virtual Library example to implement the
> image map so that when user clicks a region of the image, it is just a
> link to another page.
>
> The problem now is I don't know how many <area jwcid="@DirectArea" .../>
> tags will be in .html for image map and I have to specify the "coords"
> attribute in each <area> tag myself. Because in my web app, I don't know
> how many family memebers'names the user will provide( the number of <area>
> tag is unknown) and what relations will be among them ( the rectangle's
> coordinates on the image will be different everytime, so the "coords"
> value in each <area> is unknown), say this time there should be 1 <area>
> tag(1 clickable area on that image) and the coords value is "10,10 10,10",
> but next time user wants 2 <area> tags(2 clickable area on that image) and
> the coords value are "20,20 20,20 ", "30,30 30,30" that's what
> DirectArea.java does not do, because the coords attribute's value is
> already specified in .html and the number of <area> tag doesn't change. I
> know there is a way to specify coords value in DirectArea.java in the
> method below:
>
> protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle)
> {
> if (cycle.isRewinding())
> return;
>
> Object[] parameters =
> DirectLink.constructServiceParameters(getParameters
>
> ());
>
> IEngineService service = cycle.getEngine().getService
>
> (Tapestry.DIRECT_SERVICE);
> ILink link = service.getLink(cycle, this, parameters);
>
> writer.beginEmpty("area");
> writer.attribute("href", link.getURL());
>
> renderInformalParameters(writer, cycle);
> }
>
> I can write "writer.attribute("coords", "10, 10 10,10");" after
> "writer.attribute("href", link.getURL());"
> but since DirectArea is a component, everytime I use DirectArea component,
> the coords value would be same, that even makes it worse than specifying
> the coords's value in .html, because for each <area jwcid="@DirectArea"
> ... /> one can specify the coords'value differently.
>
> Do I have to create a new custome component of my own, if so, can I extend
> the DirectArea component's feature, modify the DirectArea.java and How ?
> or any other ways to solve the problem?
>
> thanks very much...
>
>
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