Browsing Chinese (Simplified) translation

7.

Explicitly, using statements that cause screens to be shown.

8.

More than one screen can be shown at a time.

9.

Screens have two main functions. The first is to display information to the user. Information can be displayed using text, bars, and images. Some of the information displayed in this manner is vital to gameplay. The `say` screen, for example, is used to display dialogue to the user, including the character's name and what she is saying.

10.

The other thing a screen can do is to allow the user to interact with the game. Buttons and bars allow the user to invoke actions and adjust values. Ren'Py includes a pool of pre-defined actions, allowing the user to advance the game, control preferences, load and save games, and invoke many other actions. A game-maker can also write new actions in Python.

11.

Screens are updated at the start of each interaction, and each time an interaction is restarted.

12.

**Screen code must not cause side effects that are visible from outside the screen.** Ren'Py will run screen code multiple times, as it deems necessary. It runs screen code as part of the image prediction process, before the screen is first shown. As a result, if screen code has side effects, those side effects may occur at unpredictable times.

13.

A screen has a scope associated with it, giving values to some variables. When a variable is accessed by a screen, it's first looked up in the scope, and then looked up as a global variable.

14.

Screen Language

15.

The screen language is a mostly-declarative way of displaying screens. It consists of a statement that declares a new screen, statements that add displayables to that screen, and control statements.

16.

Here's an example of a screen.::