太阳地球月亮的公转(Pygame)

shigure_takimi

1. import pygame
   
2. from pygame.locals import *
   
3. import math, random
   
4. 
   
5. 
   
6. pygame.init()
   
7. screen = pygame.display.set_mode((800, 800))
   
8. pygame.display.set_caption("Sun-Earth-Moon")
   
9. 
   
10. BLACK = (0, 0, 0)
    
11. RED = (255, 0, 0)
    
12. BLUE = (0, 0, 255)
    
13. YELLOW = (255, 255, 0)
    
14. WHITE = (255, 255, 255)
    
15. rSun = 120
    
16. rEarth = 30
    
17. rMoon = 12
    
18. angleEarth = 90
    
19. angleMoon = 0
    
20. clock = pygame.time.Clock()
    
21. 
    
22. def getStars():
    
23.     return (random.randint(1, 799),random.randint(1, 799),2,2)
    
24. 
    
25. done = False
    
26. while not done:
    
27.     clock.tick(60)
    
28.     for event in pygame.event.get():
    
29.         if event.type == QUIT:
    
30.             done = True
    
31. 
    
32.     screen.fill(BLACK)
    
33.     # draw stars
    
34.     for i in range(100):
    
35.         pygame.draw.rect(screen, WHITE, getStars())
    
36.     # draw sun.
    
37.     pygame.draw.circle(screen, RED, (400, 400), rSun)
    
38.     # draw earth.
    
39.     earthPos = (400 + int(280*math.sin(math.radians(angleEarth))),\
    
40.                 400 + int(280*math.cos(math.radians(angleEarth))))
    
41.     pygame.draw.circle(screen, BLUE, earthPos, rEarth)
    
42.     angleEarth += 1
    
43.     angleEarth %= 360
    
44.     # draw moon.
    
45.     moonPos = (earthPos[0] + int(80*math.sin(math.radians(angleMoon))),\
    
46.                earthPos[1] + int(80*math.cos(math.radians(angleMoon))))
    
47.     pygame.draw.circle(screen, YELLOW, moonPos, rMoon)
    
48.     angleMoon += 2
    
49.     angleMoon %= 360
    
50.     pygame.display.flip()
    
51.    
    
52. pygame.quit()

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新手·ing

jerryxjr1220

有点意思，但是其实太阳，地球和月球的公转是三维的，而不是平面的，所以不是每次都能三星共线的。

冬雪雪冬

很不错！

jerryxjr1220

如果把月亮的轨迹记录下来，看看是什么图形

shigure_takimi

1. import pygame
   
2. from pygame.locals import *
   
3. import math, random
   
4. 
   
5. 
   
6. pygame.init()
   
7. screen = pygame.display.set_mode((800, 800))
   
8. pygame.display.set_caption("Sun-Earth-Moon")
   
9. 
   
10. BLACK = (0, 0, 0)
    
11. RED = (255, 0, 0)
    
12. BLUE = (0, 0, 255)
    
13. YELLOW = (255, 255, 0)
    
14. WHITE = (255, 255, 255)
    
15. rSun = 120
    
16. rEarth = 5
    
17. rMoon = 5
    
18. angleEarth = 90
    
19. angleMoon = 0
    
20. clock = pygame.time.Clock()
    
21. 
    
22. def getStars():
    
23.     return (random.randint(1, 799),random.randint(1, 799),2,2)
    
24. 
    
25. screen.fill(BLACK)
    
26. # draw stars
    
27. for i in range(100):
    
28.     pygame.draw.rect(screen, WHITE, getStars())
    
29. # draw sun.
    
30.     pygame.draw.circle(screen, RED, (400, 400), rSun)
    
31. 
    
32. done = False
    
33. while not done:
    
34.     clock.tick(60)
    
35.     for event in pygame.event.get():
    
36.         if event.type == QUIT:
    
37.             done = True
    
38.    
    
39.     # draw earth.
    
40.     earthPos = (400 + int(280*math.sin(math.radians(angleEarth))),\
    
41.                 400 + int(280*math.cos(math.radians(angleEarth))))
    
42.     pygame.draw.circle(screen, BLUE, earthPos, rEarth)
    
43.     angleEarth += 0.1
    
44.     angleEarth %= 360
    
45.     # draw moon.
    
46.     moonPos = (earthPos[0] + int(80*math.sin(math.radians(angleMoon))),\
    
47.                earthPos[1] + int(80*math.cos(math.radians(angleMoon))))
    
48.     pygame.draw.circle(screen, YELLOW, moonPos, rMoon)
    
49.     angleMoon += 3
    
50.     angleMoon %= 360
    
51.     pygame.display.flip()
    
52.    
    
53. 
    
54. pygame.quit()

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把screen.fill()提到外面去，就不会覆盖轨迹了。
把rEarth和rMoon改小写，方便观察轨迹。

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