To provide your chart with additionnal tooltips and image map franta-hg@1: information you have to provide an additional Java class or enhance an franta-hg@1: existing one like the one below. In this tutorial we will add some franta-hg@1: methods to the datasetproducer class which had been introduced at the franta-hg@1: beginning of this tutorial.
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...franta-hg@1:
public String generateLink(Object data, int series, Object category) {
return seriesNames[series];
}
public String generateToolTip(CategoryDataset arg0, int series, int arg2) {
return seriesNames[series];
}
...
As you can see it is very easy to implement a class that produces franta-hg@1: image map and tooltips information. First of all it has to implement the franta-hg@1: interfaces CategoryItemLinkGenerator and CategoryToolTipGenerator franta-hg@1: (as it produces a CategoryDataset). For other data types refer to the cewolf java api.
franta-hg@1:To let your class produce links and tooltips for the chart image you franta-hg@1: have to change the <cewolf:img> tag as follows:
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<cewolf:img chartid="line" renderer="cewolf" width="400" height="300">franta-hg@1:
<cewolf:map id="pageViews"/>
</cewolf:img>
Reload your page and you will see tooltips and links on data points. franta-hg@1: Internet Explorer browsers are handled slightly different as others as franta-hg@1: they are able to render a tooltip based on the alt attribute franta-hg@1: inside an image map. All other browser need the overlib.js for this. franta-hg@1: Cewolf tries to determine the used browser and renders a correct page franta-hg@1: transparently.
franta-hg@1:For further information on using Cewolf refer to the Tag Library Reference and the Cewolf JavaDoc.
franta-hg@1:If you want to see more examples of how to implement catchy charts franta-hg@1: in your webapp, you should deploy the example webapp (downloadable from franta-hg@1: the Cewolf home franta-hg@1: page and have a look at its sourcecode.
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