Particle: An interactive particle.

A particle is a 2D drawing element that displays a simple geometrical shape (a rectangle or an ellipse), at given coordinates of the parent drawing or plotting panel. The shape is drawn relative (see the Position property) to the given coordinates with the size specified in each direction. The element can also be applied a rotation and a scale factor for each coordinate.

Particles respond to user interaction on their position coordinates (changing their position), invoking up to five different actions.