JFreeChart : how do you put multiple charts into a composite chart

问题

In JFreeChart is there a notion of a composite Chart.

I need to layout several charts in a grid like arrangement.

Each chart in the grid needs to have its own separate title.

I would like to be able to save this composite chart into a png file

I would get a code snippet that explains how to do this.

回答1:

As shown here, ChartPanel can be placed in any desired Swing layout. The example cited uses GridLayout. ChartUtilities has methods for rendering a chart as a .png. I see several approaches to getting a composite image:

• Use Robot#createScreenCapture() to image the layout, as shown here and here; the resulting BufferedImage can be saved using ImageIO.write().

• Use JFreeChart#createBufferedImage() to render each chart and impose the individual images into a BufferedImage to create a single image, as suggested here.

• Implement the Printable interface to render the image in a graphics context, as shown here.

来源：https://stackoverflow.com/questions/15805536/jfreechart-how-do-you-put-multiple-charts-into-a-composite-chart