Snake Game Implementation

Snake game implementation in Go using a 2-dimensional array.

Demo

Install

download the package

• git clone https://github.com/twiny/snaky
• cd snaky/

run the game directly using the Go command

• go run cmd/launcher/main.go -x 30 -y 15 -s slow

or build it

• go build -o snaky -v cmd/launcher/main.go
• chmod +x ./snaky

Command usage

• ./snaky -h print help message.
• -x game grid width
• -y game grid height
• -s game speed (string default: medium) - slow|medium|fast

How to play

• keyboard arrow key changes Snake direction.
• S Key starts the game.
• P Key pauses the game.
• R restart the game.
• ESC or Ctrl+C exit the game.

Implementation

The snake game logic:

• The snake keeps on moving in a straight line unless the direction is changed.

• If the snake ate the food it grows. then a new food will be placed on the grid. the new position must not be on the snake body nor the same as the previous one.

• If the snake bites itself or hits the wall, the game ends.

The snaky game consist of two main structures:

1 - Game struct

Game struct that represents the current game. it contains Snake, Food & Board structs

• Board holds the current game information:
• Grid is a 2d array. where snake body and food will be marked/mapped for rendering
• Cell is the coordinate of a point on the grid
• Icon used to paint the Cell when rendering board.

2 - Renderer interface

A Renderer is an interface that renders the game Board, and it consists of two methods.

• Listen(chan Event) error: this listens to user inputs and sends them to a channel of Event.
• Render(b *Board) error: this renders a game Board and prints it to the user. This way, renderer can be easily replaced.

The renderer range the grid Cell by Cell and depends on its value (Icon) it either print Head, Body, or Food.

TODO

• fix case food is generated on snake body.
• snake auto move forward.
• fix snake moving direction.
• change food icon.
• fix when snake hit itself or borders.
• show a message to the user when the game ends/restarts.
• initially the snake is stopped. disable auto-start.
• add more test cases.