Computer Graphics Lab — CSC209

Lab programs for the Computer Graphics (CSC209) course — Semester III, B.Sc. CSIT.
All programs are written in C using graphics.h (BGI) and compiled with Dev-C++ on Windows.

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Author

Sanil Sthapit
🔗 github.com/Sanil-Sth

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🛠️ Setup & How to Run

Requirements

• Dev-C++ (with BGI/graphics.h support)
• WinBGIm library configured in Dev-C++
• Windows OS

Steps to Configure Dev-C++ with graphics.h

1. Download and install Dev-C++
2. Download the WinBGIm package and copy:
   • graphics.h → C:\Dev-Cpp\include\
   • libbgi.a → C:\Dev-Cpp\lib\
3. In Dev-C++, go to Tools → Compiler Options → Linker
   Add: -lbgi -lgdi32 -lcomdlg32 -luuid -loleaut32 -lole32
4. Open any .c file from this repo and hit F11 to compile & run

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📋 Lab Index

#	Lab Title	Topic	Status
01	DDA Line Drawing	Scan Conversion	✅ Done
02	Bresenham's Line Drawing	Scan Conversion	✅ Done
03	Circle Drawing — Raster	Scan Conversion	✅ Done
04	Midpoint Circle + Arc & Sector	Scan Conversion	🔄 Pending
05	Rotate a Point about Origin	2D Transformation	🔄 Pending
06	Rotate a Triangle about Origin	2D Transformation	🔄 Pending
07	Scale a Triangle	2D Transformation	🔄 Pending
08	Translate a Triangle	2D Transformation	🔄 Pending
09	Reflect a Triangle	2D Transformation	🔄 Pending

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📚 Syllabus Coverage

Unit	Topic
Unit 1	Introduction to Computer Graphics
Unit 2	Scan Conversion Algorithms ← Labs 1–4
Unit 3	2D Geometric Transformations ← Labs 5–9

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🤖 Automated Output Generation

This repository uses GitHub Actions to automatically generate printable output documents whenever new output screenshots are pushed.

How it works

1. After completing a lab, output screenshots are pushed to the lab folder
2. GitHub Actions detects the new output_*.png files and triggers automatically
3. The generate_output_doc.py script runs in the cloud
4. A formatted .docx file is generated and saved to CG-Lab-Outputs/

Script

generate_output_doc.py — scans all Lab-*/ folders, finds output images in the correct order (output_console.png → output_gui.png → output_zoomed.png), and builds a formatted Word document for each lab.

Workflow

.github/workflows/generate_output_docs.yml — triggers on any push containing output_*.png files in a lab folder.

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🖨️ Output Files

Printable .docx output files for each completed lab are auto-generated and stored in the CG-Lab-Outputs/ folder.

Lab	Output File
01	Lab-01-DDA-Line-output_print.docx
02	Lab-02-Bresenham-Line-output_print.docx
03	Lab-03-Circle-Raster-output_print.docx
04	(pending)
05	(pending)
06	(pending)
07	(pending)
08	(pending)
09	(pending)

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📁 Repository Structure

Computer-Graphics-Lab/
│
├── README.md
├── generate_output_doc.py          ← auto-generates output docx files
├── .github/
│   └── workflows/
│       └── generate_output_docs.yml  ← GitHub Actions workflow
│
├── CG-Lab-Outputs/                 ← auto-generated printable output docs
│   ├── Lab-01-DDA-Line-output_print.docx
│   ├── Lab-02-Bresenham-Line-output_print.docx
│   ├── Lab-03-Circle-Raster-output_print.docx
│   └── ...
│
├── Lab-01-DDA-Line/
│   ├── README.md
│   ├── dda_line.cpp
│   ├── output_console.png
│   ├── output_gui.png
│   └── outputzoomed.png
│
├── Lab-02-Bresenham-Line/
│   ├── README.md
│   ├── bresenham_line.cpp
│   ├── output_console.png
│   ├── output_gui.png
│   └── output_zoomed.png
│
├── Lab-03-Circle-Raster/
│   ├── README.md
│   ├── circle_raster.cpp
│   ├── output_console.png
│   ├── output_gui.png
│   └── output_zoomed.png
│
├── Lab-04-Midpoint-Circle/
│   ├── README.md
│   └── midpoint_circle.cpp
│
├── Lab-05-Rotate-Point/
│   ├── README.md
│   └── rotate_point.cpp
│
├── Lab-06-Rotate-Triangle/
│   ├── README.md
│   └── rotate_triangle.cpp
│
├── Lab-07-Scale-Triangle/
│   ├── README.md
│   └── scale_triangle.cpp
│
├── Lab-08-Translate-Triangle/
│   ├── README.md
│   └── translate_triangle.cpp
│
└── Lab-09-Reflect-Triangle/
    ├── README.md
    └── reflect_triangle.cpp

📌 Each lab folder contains a detailed README with theory, algorithm, source code, and output screenshots.