can’t run it here
https://www.openprocessing.org/sketch/725250/
AND
Demonstrates the use of push and popMatrix to isolate transformations in a composite shape. In this case we have an alien alien hand (just 2 fingers and an opposing thumb), although it is simple enough to add more fingers.
And
Performs basic hand gesture recognitions(fingers counting). This example was compiled on Windows and it’s part of the last release of Blobscanner 0.3.4, a library for Processing that I wrote. The library was compiled on Windows,too, but it works on Linux(tested by my self) and on Mac(tested by others). That’s due,I suppose, to bytecode’s magic + the library using only primitive data type(all int,int[],few float) which are more or less the same on all the platforms. The download contains all the files needed to run the sketch.