THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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I generate the chart in one class, and I render it out in another class, effectively decoupling the view from the Actions. You can easily render it out to a file or some view other than a web response.out if you wish.
Configuration
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<result-types> <result-type name="chart" class="myapp.webwork.extensions.ChartResult"/> </result-types> |
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<action name="viewModerationChart" class="myapp.webwork.actions.ViewModerationChartAction">
<result name="success" type="chart">
<param name="width">400</param>
<param name="height">300</param> </result>
</action>
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Source Codes
My result class searches for a "chart" in the ValueStack and renders it out...
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public class ViewModerationChartAction extends ActionSupport {
private JFreeChart chart;
public String execute() throws Exception {
// chart creation logic...
XYSeries dataSeries = new XYSeries(new Integer(1)); //pass a key for this serie
for (int i = 0; i <= 100; i++) {
dataSeries.add(i, RandomUtils.nextInt());
}
XYSeriesCollection xyDataset = new XYSeriesCollection(dataSeries);
ValueAxis xAxis = new NumberAxis("Raw Marks");
ValueAxis yAxis = new NumberAxis("Moderated Marks");
// set my chart variable
chart =
new JFreeChart(
"Moderation Function",
JFreeChart.DEFAULT_TITLE_FONT,
new XYPlot(
xyDataset,
xAxis,
yAxis,
new StandardXYItemRenderer(StandardXYItemRenderer.LINES)),
false);
chart.setBackgroundPaint(java.awt.Color.white);
return super.SUCCESS;
}
public JFreeChart getChart() {
return chart;
}
}
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Explaination
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public JFreeChart getChart() {
return chart;
}
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...
| Code Block |
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<param name="width">400</param> <param name="height">300</param> |
Suggestions for the Next developer...
Currently the "chart" property is hardcoded. There should be a better way of transferring data from the Action to the Result, via some externally defined variable or something.
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But hey, the above works for now. Any suggestions are welcome.