使用Python中的arcade庫顯示雪花降落

arcade庫是一個用於創建2D街機風格視頻遊戲和模擬的Python庫。如果你想使用arcade庫創建下雪效果，你可以先建立一個新的arcade窗口，並設定深藍色背景色來代表夜空。

Using the arcade library in Python

The arcade library is a Python library used for developing 2D games and applications. It provides a simple interface to create interactive graphics and animations. In this article, we'll use the arcade libra to createf create create aol.

#To get started, we need to install the arcade library. You can do this by running the following command in your terminal or command prompt −

#

pip install arcade

Once the installation is completed, we can start writing our code. Here's a simple program that displays snowfall −

import arcade
import random

SCREEN_WIDTH = 800
SCREEN_HEIGHT = 600
SNOWFLAKE_SIZE = 64

class Snowflake:
   def __init__(self):
      self.x = random.randrange(SCREEN_WIDTH)
      self.y = SCREEN_HEIGHT + SNOWFLAKE_SIZE
      self.speed = random.randrange(5, 20)
      self.angle = random.uniform(0, 2 * 3.1415)
        
   def update(self):
      self.x += self.speed * math.sin(self.angle)
      self.y -= self.speed * math.cos(self.angle)
      if self.y < -SNOWFLAKE_SIZE:
         self.y = SCREEN_HEIGHT + SNOWFLAKE_SIZE
         self.x = random.randrange(SCREEN_WIDTH)
        
   def draw(self):
      arcade.draw_circle_filled(self.x, self.y, SNOWFLAKE_SIZE, arcade.color.WHITE)
        
class Snowfall(arcade.Window):
   def __init__(self, width, height):
      super().__init__(width, height, "Snowfall")
      arcade.set_background_color(arcade.color.BLUE_GRAY)
      self.snowflakes = []
      for i in range(100):
         self.snowflakes.append(Snowflake())
            
   def on_draw(self):
      arcade.start_render()
      for snowflake in self.snowflakes:
         snowflake.draw()
            
   def on_update(self, delta_time):
      for snowflake in self.snowflakes:
         snowflake.update()

if __name__ == "__main__":
   window = Snowfall(SCREEN_WIDTH, SCREEN_HEIGHT)
   arcade.run()

輸出

#Next, you can create a list of snowflakes, where each snowflake is represented as a tuple of (x, y, size) values. The x and y values represent the snowflake's 價snowflake's size.

在遊戲循環的每一幀中，您可以透過為每個雪花的y值添加一個小的隨機量來更新其位置。您也可以檢查雪花是否已經從螢幕底部掉落，如果是，則將其位置重設為螢幕頂部的隨機x值。

最後，您可以使用arcade.draw_circle_filled()函數在螢幕上繪製每個雪花，該函數接受(x, y)位置和大小值作為參數。

Let's go over the code step-by-step.

First, we import the arcade library and the random module, which we'll use to generate random values for the snowflakes. We also define some constants: SCREEN_WIDTH and SCREEN_HEIGHT, whichat the some constants sCREEN_WIDTH and SCREEN_HEIGHT, defines the size of our snowflakes.

Next, we define a Snowflake class. This class represents a single snowflake. In the constructor, we generate random values for the snowflake's position, speed, and angle. The update() method update() methodion the cole. angle. If the snowflake falls off the bottom of the screen, we reset its position to the top of the screen. The draw() method draws the snowflake on the screen using the arcade.draw_circle_filled(#illed(

After that, we define a Snowfall class. This class represents our main application window. In the constructor, we set the background color to blue-gray and create a list of 100 snowflakes. In the on_raw() method over the list of snowflakes and call each snowflake's draw() method. In the on_update() method, we iterate over the list of snowflakes and call each snowflake's update() method.

最後，我們建立了一個Snowfall類別的實例，並呼叫arcade.run()來啟動應用程式。

This code creates a

Snowflake

class to represent each snowflake, and a SnowfallGame class to manage the game loop and draw the snowflakes on the screen. The ##on_draw()#on_draw()#on method is called each frame to draw the snowflakes, and the on_update() method is called each frame to update the position of the snowflakes. The arcade.run()##unction starts the game loop and keeps the window open until the user closes it. 就是這樣！當你執行程式時，你應該會看到一個窗口，螢幕上會飄落雪花。 此外，Python中提供了海龜繪圖功能，我們可以使用海龜繪圖來實現下面展示的雪花效果。

#

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