/*
    L-Systems are a great simulation to explore, as there is a near infinite
    variety of images you can generate. In this example we calculate the L-System
    when we start our applet, and then alter the angle used to draw the system
    in the draw() method. We could just as well work with other parameters in
    the draw method.
*/
LSystem ls;

void setup() {

    // setup the environment
    size(500, 500);
    background(0);
    smooth();

    // setup the L-System
    ls = new LSystem("F", "FF-[-F+F+F]+[+F-F-F]");
    
    // Age the L-System four generations
    ls.simulate(4);
        
}

void draw() {

    // setup the drawing area
    background(0);
    stroke(255);
    
    // figure out a theta based upon our mouse position
    float theta = (mouseX / (float)width) * 180.0f;
    
    // set the angle for our L-System and draw it
    ls.useTheta(theta);
    ls.render();
}