PYTHON - PYGAME

 

# Examples of the math.sin() and math.cos() trig functions

# Al Sweigart al@inventwithpython.com

# You can learn more about Pygame with the

# free book "Making Games with Python & Pygame"

#

# http://inventwithpython.com/pygame

#

import sys, pygame, math

from pygame.locals import *

# set up a bunch of constants

BRIGHTBLUE = (  0,  50, 255)

RED        = (255,   0,   0)

WHITE      = (255, 255, 255)

BLACK      = (  0,   0,   0)

BGCOLOR = WHITE

WINDOWWIDTH = 640 # width of the program's window, in pixels

WINDOWHEIGHT = 480 # height in pixels

WIN_CENTERX = int(WINDOWWIDTH / 2)

WIN_CENTERY = int(WINDOWHEIGHT / 2)

FPS = 60

PERIOD_INCREMENTS = 500.0

AMPLITUDE = 100

# standard pygame setup code

pygame.init()

FPSCLOCK = pygame.time.Clock()

DISPLAYSURF = pygame.display.set_mode((WINDOWWIDTH, WINDOWHEIGHT))

pygame.display.set_caption('Trig Bounce')

step = 0

# main application loop

while True:

    # event handling loop for quit events

    for event in pygame.event.get():

        if event.type == QUIT or (event.type == KEYUP and event.key == K_ESCAPE):

            pygame.quit()

            sys.exit()

    # fill the screen to draw from a blank state

    DISPLAYSURF.fill(BGCOLOR)

    # draw waving ball

    yPos = -1 * math.sin(step) * AMPLITUDE

    pygame.draw.circle(DISPLAYSURF, BRIGHTBLUE, (int(WINDOWWIDTH * 0.333), int(yPos) + WIN_CENTERY), 40)

    # draw waving ball

    yPos = -1 * abs(math.sin(step)) * AMPLITUDE

    pygame.draw.circle(DISPLAYSURF, RED, (int(WINDOWWIDTH * 0.666), int(yPos) + WIN_CENTERY), 40)

    # draw the border

    pygame.draw.rect(DISPLAYSURF, BLACK, (0, 0, WINDOWWIDTH, WINDOWHEIGHT), 1)

    pygame.display.update()

    FPSCLOCK.tick(FPS)

    step += 0.02

    step %= 2 * math.pi