Image « LineChart « JFreeChart Q&A

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1. How to show different images for each (x,y) in Line Chart?    jfree.org

2. Line Chart with customizable image symbols    jfree.org

You can set the shapes in the renderer, but images are more difficult. There is some support in StandardXYItemRenderer to display images - to use it, you need to subclass the renderer, and override the getImage() method to supply the image(s) to display. It's pretty old code, and I don't know if anyone uses it or even if it works.