How to Scale Boxplots in JFreeChart with Multiple Categories?

Scaling Boxplots in JFreeChart with Multiple Categories

In JFreeChart, displaying boxplots for a large number of categories can pose challenges with scaling. When the preferred size of the ChartPanel is not set, the boxplots may appear too small for proper readability. On the other hand, setting the ChartPanel size to accommodate the boxplots can lead to stretched labels and annotations in the legend, axis, and other chart elements.

Solution

To address the scaling issue, it is recommended to adjust the size of the ChartPanel containing the chart, not the chart itself. By setting the preferred dimensions of the ChartPanel, you can control the display size of the chart while maintaining the appropriate scale for all its elements.

<code class="java">scrollPane.setPreferredSize(new Dimension(800,700));</code>

Additional Notes:

• Using a scroll pane to contain the chart is not recommended as it may restrict the ability to display the entire chart effectively.
• To overcome the limitation of displaying too many categories, consider implementing a sliding dataset approach. By creating a custom dataset that allows for pagination or scrolling through a subset of the data, you can manage the number of categories displayed at once.
• Alternatively, a paging mechanism can be implemented using external controls, allowing users to navigate through the data pages. This approach is exemplified in the provided code example below:

<code class="java">// Define the number of visible categories
private static final int VISIBLE = 4;
// ...
// Create a control panel with navigation buttons
createControlPanel();
// ...
private void createControlPanel() {
    controlPanel = new JPanel();
    controlPanel.add(new JButton(new AbstractAction("\u22b2Prev") {
        // Implementation for navigating to the previous page
    }));
    controlPanel.add(new JButton(new AbstractAction("Next\u22b3") {
        // Implementation for navigating to the next page
    }));
}</code>

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