Programatically save a chart as an image

[fabiok]

Hi!

I have a program that generate a couple of charts dinamically. After some periodic calculations, the charts are updated with a new bar during a period user-defined.

I know that with the right-click button we can save the chart as an image. But can I access the method to save the chart as an image programatically?
I mean, an image of the final chart must be saved and I don't want ask the user to do it. I wanna do it programatically...

Is it possible?

Thanks in advance!

[skunk]

Look at org.jfree.chart.ChartUtilities

[nemesi8s]

Look at org.jfree.chart.ChartUtilities

That stuff is a piece of sh**. It generates a low quality image (even if the image quality float is maximized), with lower (yes, it can be lower) quality text on it. Sadly there's no other method for saving a chart to file...

[pooo]

If you don't want to deal with ChartUtilities, I suggest you have a look at the ScreenImage class. I never used it myself, but it looks rather simple.

http://tips4java.wordpress.com/2008/10/13/screen-image/

Basically, all you have to do is create a chart, add this chart to a ChartPanel, call the method ScreenImage.createImage(...), and eventually call the method ScreenImage.writeImage(...) to store the image to a file.

Code: Select all

JFreeChart chart = ChartFactory.createLineChart(...);
ChartPanel panel = new ChartPanel(chart);
ScreenImage.writeImage(ScreenImage.createImage(panel), "myImageFile.jpg");

[fabiok]

Thank you for the replies!

No problem in using the org.jfree.chart.ChartUtilities...

I'll try using this class.

[fabiok]

Look at org.jfree.chart.ChartUtilities

By clicking in "Save Image" in context menu (clicking directly on generated map) who method is called? org.jfree.chart.ChartUtilities.saveChartAsPNG ?

Thanks in advance!

[skunk]

Read the source for org.jfree.chart.ChartPanel

Code: Select all

public void doSaveAs() throws IOException {