week4_motion_of_ball_1(小球运动)—

# Ball motion with an explicit timer

import simplegui

# Initialize globals

width = 600

height = 600

ball_pos_init = [width/2, height/2]

ball_radius = 20

ball_vel = [1, 1]

t = 0

# define event handlers

def draw(canvas):

    global ball_pos, ball_vel

    ball_pos = [0, 0]

    # calculate ball position， 所用p(t+1) = p(0) + (t+1)*v,每0.1s移动一个像素pixels

    ball_pos[0] = ball_pos_init[0] + t * ball_vel[0]

    ball_pos[1] = ball_pos_init[1] + t * ball_vel[1]

    # draw ball

    canvas.draw_circle(ball_pos, ball_radius, 6, 'white')

def tick():

    global t

    t = t + 1

# create frame

frame = simplegui.create_frame('ball_motion', 600, 600)

timer = simplegui.create_timer(100,tick)

# register event handlers

frame.set_draw_handler(draw)

# start frame

frame.start()

timer.start()

rt()

巴特西

week4_motion_of_ball_1(小球运动)——最基本

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