Fractal: Minkowski sausage

minkowski-sausage.pyde

class Point:
    thn = atan(0.5)
    thnn = 3 * PI / 2
    def __init__(self, x, y):
        self.x = x
        self.y = y
        
    def nextPoints(self, p1):
        pnx = ((p1.x - self.x) * cos(self.thn) - (p1.y - self.y) * sin(self.thn)) / sqrt(5) + self.x
        pny = ((p1.x - self.x) * sin(self.thn) + (p1.y - self.y) * cos(self.thn)) / sqrt(5) + self.y
        pn = Point(pnx, pny)
        pnnx = ((pn.x - self.x) * cos(self.thnn) - (pn.y - self.y) * sin(self.thnn)) + pn.x
        pnny = ((pn.x - self.x) * sin(self.thnn) + (pn.y - self.y) * cos(self.thnn)) + pn.y
        pnn = Point(pnnx, pnny)
        return([pn, pnn])

curr = [Point(0, 0), Point(200, 0), Point(200, 200), Point(0, 200)]
nex = list()
n = 0

def setup():
    size(500, 500)
    noLoop()
    fill(0)
    textSize(16)
    
def draw():
    global curr, nex, n
    if n > 5:
        exit()
    background(250, 250, 250)
    text("n = {}".format(n), 25, 25)

    translate(width / 2 - 100, height / 2 - 100)

    for i in range(len(curr)):
        if i == len(curr) - 1:
            p0 = curr[i]
            p1 = curr[0]
            line(p0.x, p0.y, p1.x, p1.y)
        else:
            p0 = curr[i]
            p1 = curr[i+1]
            line(p0.x, p0.y, p1.x, p1.y)
#    saveFrame("minkowski-sausage-{}.png".format(n))
    for i in range(len(curr)):
        if i == len(curr) - 1:
            p0 = curr[i]
            p1 = curr[0]
            nex.append(p0)
            nex += p0.nextPoints(p1)
        else:
            p0 = curr[i]
            p1 = curr[i+1]
            nex.append(p0)
            nex += p0.nextPoints(p1)
    curr = nex[:]
    nex = list()
    n += 1

    noLoop()

def mousePressed():
  loop()
  
# mouseReleased() broken?
# def mouseReleased(): 
#   noLoop()