Coding a GUI in C

Date: 24 August 2026 | Posted by: voska89

A mid-level course on writing a 2D graphics engine and a real Graphical User Interface from scratch, in C

What you'll learn

⚡ Learn to design the GUI in Adobe Illustrator
⚡ Learn to create a color scale by utilizing some html and css
⚡ Learn to program a Graphical User Interface from scratch in C
⚡ Write your own 2D graphics engine utilizing C and a little low-level Assembly code

Requirements

❗ You need a basic understanding of the C language, everything else is spelled-out in the course

Description

Code a GUI from scratch in C!"Build a 2D graphics engine & display custom windows in this epic 2-part tutorial. Subscribe now!"
Welcome to the "Code a GUI in C" project! In this self-contained tutorial, we're building a custom Windows-like system from the ground up. You'll learn to code a 2D graphics engine, design a graphical user interface (GUI), and display real windows on-screen with mouse controls—all in C! We'll run everything in a virtualized environment (works on Windows, Linux, or (Mac OSX), with easy setup instructions included).
What You'll LearnPart 1: Design the interface, code a 2D graphics engine from scratch, handling text, points, lines, and rectangles. Part 2: Parse the .BMP file format to draw pixel-perfect images for your GUI's window designs.
Prerequisites
Basic C knowledge is needed, but don't worry—additional components are minimal (just 5% of the project), and you can copy them if needed. The full source code is available for free at my code repo.
Timestamps
00:00:00 - Introduction and design
01:47:51 - Part 1: Handling Text
02:22:38 - Drawing a Point
03:14:40 - Drawing a Line
03:57:38 - Drawing a Rectangle
04:38:58 - Drawing 2D Graphics
04:48:02 - Troubleshooting Memory
05:06:09 - Success
05:08:00 - Part 2: .BMP File Format
05:37:30 - Parsing Image Header
06:39:40 - Draw Image on Screen
08:15:48 - A printf() Function
09:45:15 - Improving printf()
10:30:51 - Color Palettes
Enroll today or check out the free samples.

Who this course is for

⭐ This course is for mid-level C coders who wish to take the next steps and write their own graphics engine and GUI

Homepage

https://www.udemy.com/course/coding-a-gui-in-c

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