How to Scale JFreeChart Boxplots with Multiple Categories without Distortion?

Scaling JFreeChart Boxplots with Multiple Categories

In JFreeChart, when displaying boxplots for a dataset with numerous categories and series, it can be challenging to achieve proper scaling without causing distortion in other chart elements.

Problem:

By default, setting the preferred size of the ChartPanel scales both the boxplots and the associated legend, labels, and annotations. This can result in either small boxplots or stretched non-boxplot elements.

Solution:

To prevent unwanted scaling of non-boxplot elements, focus on scaling only the Plot itself, without affecting the entire Chart.

Steps:

1. Set Preferred Size of ChartPanel, Not Chart:

   Set the preferred size of the ChartPanel container, rather than the chart itself. Doing this ensures that only the Plot gets scaled proportionally.

2. Customize Plot:

   Configure the Plot's dimensions, margins, and other properties to achieve the desired size and layout of the boxplots.

Alternative Approach:

Data Pagination:

Instead of scaling the entire dataset, consider implementing a data pagination mechanism. This involves breaking down the dataset into manageable chunks and displaying only a portion of it at a time. A scrollbar can be used to navigate between portions of the dataset.

Benefits:

• Prevents overcrowding and ensures readability
• Maintains the correct aspect ratio and size of boxplots
• Suitable for large datasets

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