ÿØÿà JFIF      ÿÛ „ 	 ( %!1!%)+//.383,7(-.+



-%%-////---/-.+/--+------/------/--0+--/-/-----.-----ÿÀ  ¥2" ÿÄ               ÿÄ J  	     ! 1AQ"aq2‘#BR‚¡ÁÑ3br’¢±Âð$CSƒ²á4c“%DsÓñÿÄ              ÿÄ *        !1AQa‘"2q3±ð#b¡ÿÚ   ? ¼QxJQaÍuò¸Zö Úü8,ÐÚú
"SSn<rçù–´âE—^ªBÖ9À\†¸ÔÁT­ÃÛ5
ëd´³Í#Ý;Þ38œî ¶H£M:wÎ3…³…âpÔF&‚FK¸9„â4àGEõªfÿ ‘ñ(ßw­pŽF|È¥ù®häðÍÑ¶¹‘[ÒinÙW¶ùñY˜Q{›K"išÒ[Ú8žë\F¹@-?v"ÔU”,ìöžkÿ {I‡£šÍ?e
ríV
..............................................................................................................................................................................
.............................................................................                                                  
                                                                                                                                                                                     ÿØÿà JFIF      ÿÛ „ 	 ( %!1!%)+//.383,7(-.+



-%%-////---/-.+/--+------/------/--0+--/-/-----.-----ÿÀ  ¥2" ÿÄ               ÿÄ J  	     ! 1AQ"aq2‘#BR‚¡ÁÑ3br’¢±Âð$CSƒ²á4c“%DsÓñÿÄ              ÿÄ *        !1AQa‘"2q3±ð#b¡ÿÚ   ? ¼QxJQaÍuò¸Zö Úü8,ÐÚú
"SSn<rçù–´âE—^ªBÖ9À\†¸ÔÁT­ÃÛ5
ëd´³Í#Ý;Þ38œî ¶H£M:wÎ3…³…âpÔF&‚FK¸9„â4àGEõªfÿ ‘ñ(ßw­pŽF|È¥ù®häðÍÑ¶¹‘[ÒinÙW¶ùñY˜Q{›K"išÒ[Ú8žë\F¹@-?v"ÔU”,ìöžkÿ {I‡£šÍ?e
ríV
..............................................................................................................................................................................
.............................................................................                                                  
                                                                                                                                                                                     U
    e5d                     @   s`   d Z ddlmZmZmZmZ dZG dd deZ	G d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   c                   @   s$   e Zd Zdd Zdd Zdd ZdS )GravSysc                 C   s   g | _ d| _d| _d S )Nr   g{Gz?)planetstdt)self r   2/usr/lib64/python3.8/turtledemo/planet_and_moon.py__init__   s    zGravSys.__init__c                 C   s   | j D ]}|  qd S )N)r   init)r   pr   r   r   r      s    
zGravSys.initc                 C   s6   t dD ](}|  j| j7  _| jD ]}|  q"qd S )Ni'  )ranger	   r
   r   step)r   ir   r   r   r   start    s    
zGravSys.startN)__name__
__module____qualname__r   r   r   r   r   r   r   r      s   r   c                   @   s,   e Zd Zdd Zdd Zdd Zdd Zd	S )
Starc                 C   sT   t j| |d |   || _| | || _|j|  || _| 	d | 
  d S )N)shapeuser)r   r   Zpenupmsetposvr   appendgravSysZ
resizemodeZpendown)r   r   xr   r   r   r   r   r   r   '   s    

zStar.__init__c                 C   s,   | j j}|  | _| jd| | j  | _d S )N      ?)r   r
   accar   r   r
   r   r   r   r   1   s    
z	Star.initc                 C   sR   t dd}| jjD ]:}|| kr| |   }|t|j t|d  | 7 }q|S )Nr      )Vecr   r   posGr   abs)r   r#   planetr   r   r   r   r"   5   s    
 zStar.accc                 C   sj   | j j}| |  || j   | j j| dkrJ| | | j jd  | 	 | _
| j|| j
  | _d S )Nr   )r   r
   r   r'   r   r   indexZ
setheadingZtowardsr"   r#   r$   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  } |   |  dd |   |   | d | d |   | 	dd | 
  |  }|   | 	dd | 
  |  }td}||d ||d |  d| |  d	d t }td
tddtdd|d}|d |d |  tdtddtdd|d}|d |d td	tddtdd|d}|d |d |  |  dS )Nr      Z      ZcompoundZorangeZbluer*      i@B g      circleZyellowg?i0        Zgreeng?   i'  r!   zDone!)r   resetZ	getscreenZtracerZhtZpufdltZ
begin_polyr0   Zend_polyZget_polyr   ZaddcomponentZregister_shaper   r   r&   ZcolorZ	shapesizeZpencolorr   r   )sZm1Zm2ZplanetshapeZgsZsunZearthZmoonr   r   r   mainF   sD    







r8   __main__N)__doc__Zturtler   r   r   r   r&   r(   objectr   r   r8   r   r   r   r   r   <module>   s    '