How to Put Snake on A Graphics Calculator

This guide explains how to program a classic Snake game on a graphics calculator using TI-Basic or similar programming languages. Whether you're a student or enthusiast, you'll learn how to create this iconic game from scratch.

Introduction

The Snake game is a timeless classic that tests your reflexes and programming skills. On a graphics calculator, you can create this game using programming languages like TI-Basic. This guide will walk you through the process step by step.

Programming a Snake game on a calculator requires understanding basic programming concepts such as variables, loops, and conditional statements. You'll need to handle the snake's movement, food generation, collision detection, and score tracking.

Requirements

Hardware Requirements

A graphics calculator (TI-84 Plus, TI-83 Premium, etc.)
Calculator cable and computer (optional, for transferring programs)

Software Requirements

TI Connect CE or TI Connect software (for transferring programs)
Text editor (optional, for writing programs before transferring)

Programming Knowledge

Basic understanding of programming concepts
Familiarity with calculator programming languages (TI-Basic, etc.)

Step-by-Step Guide

Step 1: Initialize Variables

Start by initializing variables for the snake's position, direction, food position, and score. Use lists to store the snake's body segments.

Example Initialization:

Dim snakeX(100), snakeY(100)
snakeX(1)→0
snakeY(1)→0
direction→1
foodX→randInt(0,9)
foodY→randInt(0,5)
score→0

Step 2: Draw the Snake and Food

Create functions to draw the snake and food on the calculator's screen. Use the Line and Pixel-Test commands to draw and detect collisions.

Example Drawing Function:

DrawSnake→ClrDraw
For(I,1,length(snakeX))
Line(snakeX(I),snakeY(I),snakeX(I+1),snakeY(I+1),1)
End
Line(foodX,foodY,foodX+1,foodY+1,1)

Step 3: Handle Input

Use the calculator's arrow keys to control the snake's direction. Update the direction variable based on user input.

Example Input Handling:

If getKey(1)=1
direction→1
ElseIf getKey(2)=1
direction→2
ElseIf getKey(3)=1
direction→3
ElseIf getKey(4)=1
direction→4
End

Step 4: Update Snake Position

Move the snake by updating its position based on the current direction. Shift the body segments to create the illusion of movement.

Example Movement Logic:

For(I,length(snakeX),1,-1)
snakeX(I+1)→snakeX(I)
snakeY(I+1)→snakeY(I)
End
If direction=1
snakeX(1)→snakeX(1)+1
ElseIf direction=2
snakeY(1)→snakeY(1)+1
ElseIf direction=3
snakeX(1)→snakeX(1)-1
ElseIf direction=4
snakeY(1)→snakeY(1)-1
End

Step 5: Check for Collisions

Detect collisions with the snake's body, walls, or food. Update the score and generate new food when the snake eats.

Example Collision Detection:

If snakeX(1)=foodX and snakeY(1)=foodY
score→score+1
foodX→randInt(0,9)
foodY→randInt(0,5)
ElseIf snakeX(1)<0 or snakeX(1)>9 or snakeY(1)<0 or snakeY(1)>5
Disp "Game Over"
Stop
End

Step 6: Main Game Loop

Combine all the previous steps into a main game loop that runs continuously until the game ends.

Example Main Loop:

While 1
DrawSnake
HandleInput
UpdateSnake
CheckCollisions
Pause 0.1
End

Troubleshooting

Common Issues and Solutions

Snake not moving: Check the input handling code to ensure the direction variable is being updated correctly.
Game crashes: Verify that all variables are properly initialized and that loops have correct termination conditions.
Food not appearing: Ensure the random number generator is working correctly and that the food position is within the screen bounds.

Tip: Use the calculator's debug mode to step through your program and identify any issues.

FAQ

Can I modify the game to include obstacles?

Yes, you can add obstacles by creating additional lists to store their positions and checking for collisions with them in the collision detection code.

How can I increase the difficulty of the game?

You can increase the speed of the snake by reducing the pause duration in the main game loop or by adding more obstacles to the game.

Is it possible to save the high score?

Yes, you can use the calculator's memory to store the high score and display it at the start of the game.