Control a snake using JavaScript (demo of QuickJS-Pascal and Castle Game Engine)

Overview

This demo shows QuickJS-Pascal (Pascal bindings to QuickJS) integrated with Castle Game Engine.

The demo is based on a snake game. In the original snake game, you control snake by the keyboard. In this version, you control snake by implementing an A.I. using JavaScript :)

The core file to play with is the data/movement.js. There you have to define a global update function, which is called once per second, and can move the snake using these JS functions:

• goal_position() - returns a structure with x and y fields (like {x:3,y:5}) that contains the position of the "goal" on the map.

• player_position() - returns a structure with x and y fields that contains the current player position on the map.

• move(x, y). Moves the player. Can be called at most once per update(). The only allowed arguments' combinations are:

  • move(+1, 0) (move right)
  • move(-1, 0) (move left)
  • move(0, +1) (move up)
  • move(0, -1) (move down)

Supported platforms

The demo is cross-platform and should support every platform supported by Castle Game Engine. Build it using Castle Game Engine build tool or Lazarus.

• Tested

  • Mac OS Catalina
  • IOS 13.3.1

• TODO

  • Test on Linux, Windows, Android
  • Add more JS examples
    • Add Start function to be called on game init
    • Implement full UIFont interface to JS

You can download QuickJS library files from here: Download

QuickJS-Pascal

https://github.com/Coldzer0/QuickJS-Pascal

Game Credit

Demo by Coldzer0, who also created QuickJS-Pascal.

Original snake game by Eugene Loza.