A PtPlot: 2D Graphs within JavaPtPlot is an excellent plotting package that lets you plot directly from your Java programs.PtPlot is free, written in Java (and thus runs under Unix, Linux, Mac OS, and MS Windows), is easy to use, and is actually part of Ptolemy, an entire computing environment that is supported by the University of California. Figure A.1 is an example of a PtPlot graph.Because PtPlot is not built into Java, your Java program needs to import the PtPlot package and work with its classes.We suggest that you download the most recent version over the Web.