noisy_circles3.pyde

NO_POINTS = 9

def setup():
    fullScreen()
    frameRate(15)
    background(0)
        
def draw():
    background(0)
    stroke(255)
    
    for r in range(50, 800, 25):
        stroke(255, 185- r * 255/800)
        pseudo_circle(radius=r, circle_center=(width/2, height/2), no_points=NO_POINTS)

def mousePressed():
    background(0)
    

def pseudo_circle(radius, circle_center, no_points=8):
    xs = []
    ys = []
    noise_values = []
    for i in range(no_points + 3):
        if i < no_points:
            angle = 0.1*frameCount/TWO_PI + TWO_PI * i/(no_points * 1.) * map(noise(i + 0.01*frameCount), 0, 1, 0.9, 1.1) 
            radius_noise = map(noise(i/9 + 0.01*frameCount), 0, 1, 0.1, 2) 
            x_ = circle_center[0] + cos(angle) * radius * radius_noise
            y_ = circle_center[1] + sin(angle) * radius * radius_noise
        else:
            # these are necessary to finish the shape
            x_ = xs[i % no_points]
            y_ = ys[i % no_points]
            
        # ellipse(x_, y_, 10, 10)
        xs += [x_]
        ys += [y_]
        
    xys = zip(xs, ys)
    line_sequence(*xys)
    

def line_sequence(*args):
    noFill()
    beginShape()
    for x in args:
        curveVertex(*x)
    endShape()