# Usage

Three steps : initialize, use and terminating.

## Initialize

Call the subroutine `genp_init` with two parameters.
The first is an integer and must be 0. 
The second is the filename for recording the plottings instructions,
if this filename is an empty string, *stdout* will be used.

## Use it

- call genp_move(x, y)
- call genp_draw(x, y, c)

## Terminator

- call genp_end(0)