Python八大行星漂亮動畫演示

"""一個簡單的演示八大行星公轉的動畫，採用arcade街機遊戲模塊製作，安裝Arcade請用pip install arcade --user。
A simple animation to simulate the rotation of eight planets is made by using Arcade module. To install Arcade, use PIP install arcade--user.
"""

__author__ = "lixingqiu"
__date__ = "2019/3/8"

import time
import math
import arcade
import random

SCREEN_WIDTH = 1350
SCREEN_HEIGHT = 780
SCREEN_TITLE = "eight planet 八大行星"

class Planet(arcade.Sprite):
    def __init__(self,image,a,b,angle,speed):
        """image:造型圖片,a：Long axis長半軸，b：semi-minor axis短半軸，angle：初始角度"""
        super().__init__(image)
        self.center_x = SCREEN_WIDTH / 2
        self.center_y = SCREEN_HEIGHT / 2        
        self.direction = angle                  # 自定義direction，不用原有屬性angle   
        self.a = a
        self.b = b
        self.speed = speed        
        
    def update(self):
        """ Calculating Initial Coordinates Based on Elliptic Parametric Equation"""

        self.direction = self.direction + 365 / self.speed 
        self.direction = self.direction % 360        
        x = SCREEN_WIDTH / 2 + self.a * math.cos(math.radians(self.direction)) # 根據橢圓參數方程算起始座標
        y = SCREEN_HEIGHT / 2 + self.b * math.sin(math.radians(self.direction))
        self.center_x = x
        self.center_y = y
        super().update()        
    
class MyGame(arcade.Window):
    """
    繼承自窗口的MyGame類.
    """

    def __init__(self, width, height, title):
        super().__init__(width, height, title)
        arcade.set_background_color(arcade.color.WHITE)
                       
        
    def setup(self):
        """ 這裏是對遊戲中的各個對象進行設置 """
      
        self.planet_list = arcade.SpriteList()                # 新建角色列表，以便統一渲染          

        # 背景角色生成
        pass

        # 太陽角色生成
        pass        

        # 行星角色生成
        pass
        
        for i in range(8):                                     # 生成8個行星
            angle = self.angle_list[i]
            a,b = self.ab_list[i]
            image = self.planets_image[i]
            speed = self.days[i]
            aplanet = Planet(image,a,b,angle,speed)          # 新建行星
            self.planet_list.append(aplanet)                 # 添加到所有行星列表              
         
    def update(self, x):
        """每幀更新遊戲內在邏輯"""        
 
        self.planet_list.update()       
        self.sun.update_animation()     
 
    
    def on_draw(self):
        """渲染屏幕 """

        arcade.start_render()  

        # 開始畫背景
        self.background.draw()
        self.sun.draw()
        self.planet_list.draw()        
 

def main():
    """ Main method """
    window = MyGame(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_TITLE)
    window.setup()
    arcade.run()


if __name__ == "__main__":
    main()