관리-도구
편집 파일: planet_and_moon.cpython-38.pyc
U e5d � @ s` d Z ddlmZmZmZmZ dZG dd� de�Z G dd� de�Z dd � Z e d kr\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 Zd Zdd� Zdd� Zdd� ZdS )�GravSysc C s g | _ d| _d| _d S )Nr g{�G�z�?)�planets�t�dt)�self� r �2/usr/lib64/python3.8/turtledemo/planet_and_moon.py�__init__ s zGravSys.__init__c C s | j D ] }|�� qd S )N)r �init)r �pr r r r s z GravSys.initc C s6 t d�D ](}| j| j7 _| jD ] }|�� q"qd 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 Zd Zdd� Zdd� Zdd� Zdd� Zd S ) �Starc C sT t j| |d� | �� || _| �|� || _|j�| � || _| � d� | � � 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}| �� | _| jd| | j | _d S )N� �?)r r �acc�ar �r r r r r r 1 s z Star.initc C sR t dd�}| jjD ]:}|| kr|�� | �� }|t|j t|�d | 7 }q|S )Nr � )�Vecr r �pos�Gr �abs)r r# �planetr r r r r" 5 s zStar.accc C sj | j j}| �| �� || j � | j j�| �dkrJ| �| �| j jd �� | � � | _ | j|| j | _d S )Nr ) r r r r' r r �indexZ setheadingZtowardsr" 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 � } | �� | �� �dd� | �� | �� | �d� | �d� | �� | � dd� | � � | � � }| �� | � dd� | � � | � � }t d�}|� |d� |� |d� | �� �d|� | �� �d d� t� }td tdd�tdd �|d �}|�d � |�d� |�� tdtdd�tdd�|d�}|�d� |�d� td tdd�tdd�|d�}|�d� |�d� |�� |�� dS )Nr � �Z � ZcompoundZorangeZbluer* � i@B g ��circleZyellowg������?i�0 �� �� Zgreeng�������?�� i' r! zDone!)r �resetZ getscreenZtracerZhtZpu�fd�ltZ begin_polyr0 Zend_polyZget_polyr Z addcomponentZregister_shaper r r& ZcolorZ shapesizeZpencolorr r )�sZm1Zm2Z planetshapeZgsZsunZearthZmoonr r r �mainF sD r8 �__main__N) �__doc__Zturtler r r r r& r( �objectr r r8 r r r r r �<module> s '