EDITO : I decided to learn more things about oriented object programming using Processing thanks to Daniel Shiffman's (an awesome guy and also very good teacher) book called Nature of code (natureofcode.com/) and videos (vimeo.com/shiffman/videos).
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Here is my first application made after chapters 1, 2 and 3.

Implemented things :

- Multiple forces (gravity, drag, attraction, repulsion).
- Drag zone (blue square, liquid).
- Color and opacity of particles maped to velocity.
- Particles orientation mapped to velocity.
- Keybord / Mouse input to change forces values.

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