i'm a begginer on these of processing and i want to know how could i do that processing recognizes a trajectory of a drawing made by my. and translate this draw (simple lines) to coordinates that follow this trajectory.

actualy i want to use this to conect processing with arduino, but this will be another thing...

If this propose can't be done how could processing tell me the coordinates of a tracking of colour (using jmyron)

thanks!! and forgive my english!!