Use PYSDL2 to develop the basic knowledge of GUI applications

Use PYSDL2 to develop the basic knowledge of GUI applications PYSDL2 is a software package used to write the Python program using the SDL2 graphics library.SDL2 (Simple DirectMedia Layer 2) is an open source cross -platform multimedia library that provides the processing function of underlying audio, images and input devices.Through PYSDL2, developers can create applications with graphical user interface (GUI), where users can interact with applications through mouse, keyboard and other devices. The following is the basic steps to develop GUI applications using PYSDL2: 1. Install PYSDL2: Before the beginning, you need to install the PYSDL2 software package on the system.You can use the PIP command to execute the following commands in the terminal to install PYSDL2: pip install PySDL2 2. Import the necessary modules: At the beginning of the python program, some modules of PYSDL2 need to be imported, such as `sdl2`,` sdl2.ext` and `sdl2.ext.gui.These modules will be used to create windows, process user input, and perform graphical interface development. python import sdl2 import sdl2.ext from sdl2.ext.gui import * 3. Create window: Use PYSDL2's `sdl2.ext.window` class to create a GUI window, which is a definition window by the size and title of the specified window. python Window = SDL2.Ext.Window ("GUI Application", SIZE = (800, 600))) window.show() 4. Initialize the GUI system: In order to be able to use the GUI function of PYSDL2, you need to initialize the GUI system through the `SDL2.Ext.initgui ()` function. python sdl2.ext.InitGUI() 5. Create GUI control: Use the GUI module of PYSDL2 to create a variety of GUI controls, such as buttons, text boxes, labels, etc.For example, you can create a button using the `Button` class. python Button = Button (Label = "Click me", posity = (100, 100), size = (200, 50)) 6. Processing event: Use the `sdl2.ext.get_events ()` function to obtain events where the user occurs, such as the button press, the mouse click, etc.By dealing with these events, interaction with users can be achieved. python for event in sdl2.ext.get_events(): if event.type == sdl2.SDL_QUIT: running = False elif event.type == sdl2.SDL_MOUSEBUTTONUP: # Treat the mouse click event if button.collide_point(event.button.x, event.button.y): Print ("button is clicked!") 7. Rendering GUI: Use the `sdl2.ext.fill` function and the` sdl2.ext.renderer "class to achieve rendering of the GUI interface. python renderer = sdl2.ext.Renderer(window) renderer.color = sdl2.ext.Color(255, 255, 255) renderer.clear() renderer.render(button) renderer.present() 8. Exit application: After completing the GUI rendering, you can clear the GUI system by calling the `sdl2.ext.quitgui ()` function, and finally exit the application at the end. python sdl2.ext.QuitGUI() sdl2.ext.quit() The above code example is the basic framework of a simple PYSDL2 GUI application.Developers can further expand and customize the GUI interface and event processing logic according to their needs and specific application scenarios. It should be noted that the above is only a basic tutorial, and it has not discussed in depth all available controls and functions.In actual development, more code and configuration may be needed to meet the needs of the application.