Saturday, May 14, 2011

Handling plots with rcaller

Using RCaller is a simple way of calling R scripts from Java. Unfortunately image handling routines was not implemented so user must handle this stuff himself. In R the result of a plot object can be saved in a simple way like this:

#Data generating process
x<-rnorm(100, 0, 2)
#we generated a normal sample with mean 0 and standard deviation 2


After running this short script, no screen output is produced but path/to/file.png is created as a png image. After calling this script from Java, produced image can be loaded like this:

ImageIcon myIcon = new ImageIcon("/path/to/file.png");
This image can be easly drawn on a swing container using

public void paintComponent(Graphics g) {
    myIcon.paintIcon(this, g, 0, 0);