oo_w_2.pyde

def setup():
    """ Create a Bandeirinha instance """
    global flag
    size(100, 100)  # Canvas size
    flag = Bandeirinha(width / 2, height / 2)

def draw():
    """ The 'main loop' invoked by Processing """
    background(0)  # Cleans the canvas, with black
    flag.plot()
    flag.move()    
    
class Bandeirinha(object):
    def __init__(self, x, y, flag_size = 50):
        self.x = x
        self.y = y
        self.size = flag_size
        
    def plot(self):
        half_flag = self.size / 2
        with pushMatrix():  # preserve the original coordinate system
            translate(self.x, self.y) # change the origin
            beginShape()  # start a shape/polygon                       
            vertex(-half_flag, -half_flag)                              
            vertex(-half_flag, half_flag)                                
            vertex(0, 0)
            vertex(half_flag, half_flag)
            vertex(half_flag, -half_flag)
            endShape(CLOSE)  # ends the polygon, closing on 1st vertex
        
    def move(self):
        self.x += 1  # increments x
        self.y += 1  # increments y
        if self.x > width + 25:
            self.x = -25
        if self.y > height + 25:
            self.y = -25