Sometimes one needs to show many data series on one chart. In such cases, usually distinction between those data series is achieved by using different colors for each data set. Most charting libraries leave colors selection to developer. This can be problem when there is need to choose more than six colors which can be easily distinguished by most people. Below you can find Python program which can be helpful.
I like Java much more (about 38 times more) than C/C++. So I have written Java version of gstpw. Java version of course has more features :) and needs less lines of code to implement them. Moreover I have provided possibility to start it: as standalone by $ java -jar jstpw.jat via WebStart: