var theta = 0.0;
var rectWidthMultiplier = 10;
var rectHeightMultiplier = 20;
var rotationSpeed = 0.001;
var x = 200;
var y = 200;
var alpha = PI / 6;
var sectionLenght = 100; //na rysunku c
var vertexLenght = 50; //na rysunku d

function setup() {
    createCanvas(windowWidth, windowHeight);
    rectMode(CENTER);
}

function draw_n_lines(width, lenght, how_many_lines, start_x=0, start_y=0,rotationSpeed=0.001){
	var sk = width;
	var ln = how_many_lines;
	strokeWeight(sk);
	beginShape(LINES);

	rotate(theta);
	for (var i=0; i<ln; i++){

	vertex(sk *i*2 + start_x, start_y);
	vertex(sk * i*2 + start_x,start_y+lenght);
	}
	    theta += rotationSpeed;

	endShape();
}
function draw() {
    background(255);

		draw_n_lines(5,100, 10,500,250,rotationSpeed=0.001);
    draw_n_lines(5, 100, 10, 1000, 250,rotationSpeed=-0.001);

}