How To Make Pictures On A Ti 84 Graphing Calculator

Pixel Art to TI-BASIC Code Generator & Guide

What is How to Make Pictures on a TI-84 Graphing Calculator?

Learning how to make pictures on a TI-84 graphing calculator is a popular way to customize your device and understand the basics of computer graphics. The TI-84 series, including the TI-84 Plus and CE, uses a 96×64 pixel screen. While this resolution is low by modern standards, it is perfect for creating pixel art, sprites for games, or simple diagrams.

Creating these pictures manually involves plotting individual points using the TI-BASIC programming language or utilizing the graphing features to draw lines and circles. Our tool above simplifies this process by letting you design visually on a web grid and automatically converting your design into the code syntax required by the calculator.

TI-84 Pixel Art Formula and Explanation

To draw a picture programmatically on a TI-84, you primarily use the Pt-On(X,Y) (Point On) command. The screen is a coordinate system where:

• X (X-coordinate): Represents the horizontal position, ranging from 0 to 94.
• Y (Y-coordinate): Represents the vertical position, ranging from 0 to 62.

The fundamental formula for drawing a single pixel is:

Pt-On(X, Y)

For more complex shapes, you can use Line(X1,Y1,X2,Y2) or Circle(X,Y,radius). However, for detailed pixel art, a series of Pt-On commands is the standard method.

Variables Table

Variable	Meaning	Unit	Typical Range
X	Horizontal coordinate	Pixels	0 – 94
Y	Vertical coordinate	Pixels	0 – 62
W	Sprite Width	Pixels	1 – 16
H	Sprite Height	Pixels	1 – 16

Practical Examples

Here are two realistic examples of how to make pictures on a TI-84 graphing calculator using the coordinate system.

Example 1: A Simple 8×8 Smile

Imagine you want to draw a simple smiley face in the top-left corner.

• Inputs: 8×8 Grid.
• Units: Pixels.
• Logic: You fill pixels at (2,2), (5,2) for eyes, and (2,5) to (5,5) for a mouth.
• Result: The calculator executes :Pt-On(2,2):Pt-On(5,2):Pt-On(2,5):Pt-On(3,5):Pt-On(4,5):Pt-On(5,5).

Example 2: A 16×16 Sword Icon

For a game sprite, you might need a larger icon.

• Inputs: 16×16 Grid.
• Units: Pixels.
• Logic: A vertical line of pixels for the blade and a block for the hilt.
• Result: A sequence of roughly 40-50 Pt-On commands creating the shape.

How to Use This TI-84 Picture Calculator

Follow these steps to generate code for your calculator:

1. Set Dimensions: Enter the desired Width and Height for your sprite (e.g., 8×8).
2. Create Grid: Click "Create Grid" to generate the interactive canvas.
3. Draw: Click on the white squares to turn them black (active). This represents a "lit" pixel on the LCD screen.
4. Generate Code: Click "Generate Code" to see the TI-BASIC commands.
5. Transfer: Copy the code, open the "Program Editor" on your TI-84 (press PRGM > New), and type (or paste via TI Connect) the commands.
6. Run: Press 2nd > Mode (Quit) to return to the home screen, then run your program to see the picture.

Key Factors That Affect TI-84 Pictures

Several factors influence the quality and feasibility of pictures on your graphing calculator:

1. Screen Resolution: The TI-84 has a fixed resolution of 96×64 pixels. You cannot exceed this physical limit.
2. Memory (RAM): Each Pt-On command takes up bytes of memory. Complex pictures can fill up your RAM quickly.
3. Contrast Settings: If your screen contrast is too low, pixel art may look faint. Adjust it using 2nd + Up Arrow.
4. Execution Speed: Drawing hundreds of individual points using Pt-On can be slow. For animations, optimized assembly code is often used instead of TI-BASIC.
5. Coordinate Origin: Remember that (0,0) is the top-left corner. Math graphs usually start bottom-left, so you must flip your Y-axis logic mentally.
6. Pixel Aspect Ratio: Calculator pixels are slightly rectangular (taller than wide), so circles may look like ovals unless corrected mathematically.

Frequently Asked Questions (FAQ)

Can I import JPG or PNG images directly to the TI-84?

Not directly using standard TI-BASIC. You need to convert images using computer software like TI Connect CE or Image Viewer for calculators, which converts the image into a proprietary AppVar format.

Why is my picture upside down?

The TI-84 coordinate system puts (0,0) at the top-left. If you drew your design assuming (0,0) is the bottom-left (like a standard Cartesian graph), you need to invert your Y-values (Height – 1 – Y).

How many pixels can I draw at once?

The screen has 6,144 total pixels (96 x 64). However, drawing all of them using TI-BASIC code will likely exceed the available RAM for a single program.

What is the difference between Pt-On and Pt-Change?

Pt-On(X,Y) turns a pixel on. Pt-Off(X,Y) turns it off. Pt-Change(X,Y) toggles the pixel (if on, it turns off; if off, it turns on).

Does this work on the TI-84 Plus CE?

Yes, the TI-BASIC commands are backward compatible. However, the CE has a color screen (320×240 resolution), so you can also use Pt-On(color) syntax for colored pictures.

How do I save my picture permanently?

You can use the StorePic command (e.g., StorePic 1) to save the current screen state to a picture file slot. Use RecallPic 1 to load it back.

Is there a limit to the grid size in this calculator?

This web tool allows up to 20×20 for usability. The actual calculator supports up to 94×62, but drawing that manually is impractical.

Why does the code use colons?

In TI-BASIC, the colon (:) separates multiple commands on a single line. It helps keep the code compact.