Triangular Fractal

int n = 0;

void setup(){

    size(320, 480);

    background(0);

    stroke(255);

    //smooth();

}

void trifract(float x, float y, float l, int level, boolean inv){

    //line(x, y, x, y+l);

    //line(x, y, x+l*sqrt(3)/2, y-l/2);

    //line(x, y, x-l*sqrt(3)/2, y-l/2);

    fill(int(random(2))*255);

    pushMatrix();

    if(inv) {

      rotate(radians(180));

    }

    triangle(x, y+l,x+l*sqrt(3)/2, y-l/2,x-l*sqrt(3)/2, y-l/2);

    popMatrix();

    if (level>1){

        l*=.5;

        level= level-1;

        trifract(x, y+l, l, level, inv);

        trifract(x+l*sqrt(3)/2, y-l/2, l, level, inv);

        trifract(x-l*sqrt(3)/2, y-l/2, l, level, inv);

    }    

}

void draw(){

    fill(0);

    rect(0,0,width, height);

    translate(width/2,height/2);

    rotate(radians(n++));

    trifract(0, 0, 160,int(random(2,5)), false);

    trifract(0, 0, 80,int(random(2,5)), true);

    trifract(0, 0, 40,int(random(2,5)), false);

}