noisy_circles4.pyde

NO_POINTS = 7

def setup():
    fullScreen()
    frameRate(15)
    background(0)
    # strokeWeight()
        
def draw():
    background(0)
    stroke(255)
    
    for r in range(25, 800, 25):
        stroke(255, 155- r * 155/800)
        pseudo_circle(radius=r, 
                      circle_center=(width/2, height/2), 
                      no_points=NO_POINTS,
                      offset=r*2)

def mousePressed():
    background(0)
    

def pseudo_circle(radius, circle_center, no_points=8, offset=0):
    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) + \
                    0.05 * offset/TWO_PI
            radius_noise = map(noise(i/9 + 0.01*frameCount + offset), 0, 1, 0.8, 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()