We need a Java applet to plot 4 values on diagonal axes, and then draw a line to join these 4 points together. The graph will be displayed with a background image, and some text on top - so we also need to be able to pass parameters for the image file location, text, font etc. An example of the chart is shown in the attached file phs01.jpg. An alternative background image is shown in phs02.jpg.
This should be very easy, probably no more than 1 hour's work if you're doing it right.