How to set color to the plot in grafica library

Processing Libraries
1

im

I want to change color of the line from grey(default) to some other color

2

-a- https://jagracar.com/grafica.php

-b- you know that this library has a reference already loaded to your PDE?
PDE / Help / Library reference / grafica /

-c- examples what come with the library:
Multiple Plots
use like

plot1.setLineColor( color(r,g,b) );