one-file-projects/lissajous.py

#!/usr/bin/env python

from game import *
from math import sin, pi

class Lissajous(Game):
    def __init__(self, fx, fy):
        self.fx = fx
        self.fy = fy
        self.width = 1000
        self.height = 600
        self.time = 0
        self.old_point = self.get_pos()
        self.new_point = self.old_point
        self.reset = False
        super(Lissajous, self).__init__(self.width, self.height, 100)

    def get_pos(self):
        return ( int( (1+sin(2*pi*self.fx*self.time)) / 2 * self.width), int( (1+sin(2*pi*self.fy*self.time)) / 2 * self.height) )

    def on_update(self, dtime):

        self.old_point = self.new_point
        self.time += dtime
        self.new_point = self.get_pos()

    def on_render(self, srfc):
        WHITE = (255,255,255)
        BLACK = (0,0,0)
        if self.reset:
            srfc.fill(BLACK)
            self.reset = False
        pygame.draw.line( srfc, WHITE, self.old_point, self.new_point )

    def on_event(self, event):
        if event.type == MOUSEBUTTONDOWN and event.button == 1:
            self.reset = True
        else:
            super(Lissajous,self).on_event(event)

if __name__ == "__main__":
    Lissajous(0.5,0.325).on_execute()