The different operations that can be performed with the transform module are:
- Scale
- Flip
- Rotate
- Rotozoom

Transform Operations in Pygame

The transform module contains various transform operations. These are operations that alter a surface's scale and rotation in some way. Some transforms are destructive in the sense that they result in pixels being lost, which means there are specific techniques required to continuously scale a surface up without losing too many pixels.

University of Michigan - Ann Arbor

You can think of a Surface as a blank piece of paper. There are plenty of methods you can call to draw on the Surface using graphics manipulation. This means altering pixel color values and their alphas. In order to actually make a game, you will have to decide which Surface you want to be your screen by calling a method on the Display (which handles the main game screen). You can only have one Surface as your screen. Additionally, all images must be displayed on a Surface.

Surfaces in Pygame

Pygame Documentation

Display is a module to control the display window and screen. Using the set_mode method, you can create the Surface that will act as the screen of your game. All other Surfaces for sprites, text, etc. will be drawn on the Surface you created with display. You can have only one display Surface at a time. If you call set_mode again, the previous screen will be replaced with the new Surface generated.

Display in Pygame

Using the display module, you are able to:

- Initalize/uninitialize a display
- Create a display surface
- Update the display

Using the Display Module in Pygame

You can use pygame.Surface.blit() to draw one surface onto another at a given location. Blit() takes in a source Surface (what you're drawing from), a destination position (where on the surface you're drawing), an optional 
set of coordinates for the area of the Surface you're drawing from, and an optional set of flags to modify the result.
```Python
displaySurface = pygame.display.set_mode(1920, 1080)
image = pygame.image.load("cat.png")
displaySurface.blit(image, (100, 100)) #this will copy the image onto the displaySurface at the position (100, 100)
```

Learn Before

Related

Learn After