`width` & `height` are not accessible as globals across imported Python modules in the same directory

Unlike in Processing tabs that exist in the same folder, different Python modules in the same directory does not share width and height information. width and height have to be imported to the Class constructor for now as a workaround.

Example:
noc-2-mewnala-port > chapter2 > Example_2_6_Attraction

• width and height are declared in Example_2_6_Attraction.py setup
• Attractor.py and Mover.py are also trying to access width and height
  Note that there is no error anyway if we try to run the sketch without providing width and height to the Classes, but it isn't exposed to modules outside the one that has size(width, height) in the setup

重現 noc-2-mewnala-port/chapter2/Example_2_6_Attraction 中的行為，其中 setup 定義 width 和 height，而 Attractor.py 和 Mover.py 存取它們。首先追蹤同一目錄中的模組如何接收 Processing 狀態；完成條件是這些模組不必將 width 和 height 傳遞給其類別建構函式即可存取它們。