Your IP : 216.73.216.213
��Yf, � @ s� d Z d d l m Z m Z m Z m Z d d l m Z d Z Gd d � d e
� Z Gd d � d e � Z d d
� Z
e d k r� e
� e � d S)
a� turtle-example-suite:
tdemo_planets_and_moon.py
Gravitational system simulation using the
approximation method from Feynman-lectures,
p.9-8, using turtlegraphics.
Example: heavy central body, light planet,
very light moon!
Planet has a circular orbit, moon a stable
orbit around the planet.
You can hold the movement temporarily by
pressing the left mouse button with the
mouse over the scrollbar of the canvas.
� )�Shape�Turtle�mainloop�Vec2D)�sleep� c @ s4 e Z d Z d d � Z d d � Z d d � Z d S)�GravSysc C s g | _ d | _ d | _ d S)Nr g{�G�z�?)�planets�t�dt)�self� r
�?/opt/alt/python35/lib64/python3.5/turtledemo/planet_and_moon.py�__init__ s zGravSys.__init__c C s" x | j D] } | j � q
Wd S)N)r �init)r �pr
r
r r s z GravSys.initc C sK xD t d � D]6 } | j | j 7_ x | j D] } | j � q/ Wq
Wd S)Ni' )�ranger
r r �step)r �ir r
r
r �start! s z
GravSys.startN)�__name__�
__module__� __qualname__r r r r
r
r
r r s r c @ s@ e Z d Z d d � Z d d � Z d d � Z d d � Z d S)
�Starc C sp t j | d | �| j � | | _ | j | � | | _ | j j | � | | _ | j d � | j
� d S)N�shape�user) r r Zpenup�m�setpos�vr �append�gravSysZ
resizemodeZpendown)r r �xr r r r
r
r r ( s
z
Star.__init__c C s: | j j } | j � | _ | j d | | j | _ d S)Ng �?)r r �acc�ar )r r r
r
r r 2 s z Star.initc C so t d d � } xY | j j D]K } | | k r | j � | j � } | t | j t | � d | 7} q W| S)Nr � )�Vecr r �pos�Gr �abs)r r# �planetr r
r
r r" 6 s 'zStar.accc C s� | j j } | j | j � | | j � | j j j | � d k re | j | j | j j d � � | j � | _
| j | | j
| _ d S)Nr ) r r r r& r r �indexZ
setheadingZtowardsr" r# )r r r
r
r r = s z Star.stepN)r r r r r r" r r
r
r
r r ' s
r c C s t � } | j � | j � j d d � | j � | j � | j d � | j d � | j � | j d d � | j
� | j � } | j � | j d d � | j
� | j � } t d � } | j
| d � | j
| d � | j � j d | � | j � j d d � t � } t d
t d d � t d d � | d � } | j d
� | j d � | j � t d t d d � t d d � | d � } | j d � | j d � t d t d d � t d d � | d � } | j d � | j d � | j � | j � d S)Nr � �Z � ZcompoundZorangeZbluer) � i@B g @�circleZyellowg������?i�0 �� �� Zgreeng�������?�� i' g �?zDone!g �)r �resetZ getscreenZtracerZhtZpu�fd�ltZ
begin_polyr/ Zend_polyZget_polyr Z addcomponentZregister_shaper r r% ZcolorZ shapesizeZpencolorr r )�s�m1�m2Z planetshapeZgsZsunZearthZmoonr
r
r �mainG sD
*
*
*
r9 �__main__N)�__doc__Zturtler r r r r% Ztimer r' �objectr r r9 r r
r
r
r �<module> s " '