🌾 Windmill Countryside

An animated 2D countryside scene built with C++ and OpenGL (GLUT/GLU). The scene features spinning windmills, moving cars, animated clouds, a day/night cycle, rain, and more — all rendered using OpenGL primitives.

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📸 Scene Preview

Day Mode	Night Mode

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📋 Scene Overview

The scene includes:

• 4 Windmills with rotating three-blade fans
• 2 Cars (red and blue) moving in opposite directions on a road
• 5 Houses with roofs, walls, doors, and windows
• Hills (2 large, 3 small) with shadow shading
• Trees and bushes scattered across the landscape
• 5 Animated clouds drifting across the sky
• Sun that rises and sets, triggering a day-to-night transition
• Moon and stars visible at night
• Rain effect (toggleable)
• Day/Night color theming applied across all scene elements

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🛠️ Built With

Tool	Purpose
C++	Core programming language
OpenGL	2D rendering via GL_POLYGON, GL_TRIANGLES, etc.
GLUT (FreeGLUT)	Window creation, event loop, keyboard & timer callbacks
GLU	Orthographic projection setup
Code::Blocks	IDE (.cbp project file included)

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📁 Project Structure

Windmill/
├── main.cpp           # Full source code
├── Windmill.cbp       # Code::Blocks project file
├── Windmill.depend    # Dependency tracking file
├── Windmill.layout    # IDE layout preferences
└── README.md

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⚙️ Prerequisites

• A C++ compiler (MinGW/GCC recommended on Windows)
• OpenGL libraries: opengl32, glu32
• GLUT / FreeGLUT: freeglut or glut
• Code::Blocks IDE (optional, for .cbp project)

Installing FreeGLUT on Windows (MinGW)

1. Download FreeGLUT from freeglut.sourceforge.net
2. Copy headers to your MinGW include/GL/ directory
3. Copy .lib/.a files to your MinGW lib/ directory
4. Copy freeglut.dll to your project directory or System32

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🚀 Building & Running

Using Code::Blocks

1. Open Windmill.cbp in Code::Blocks
2. Ensure the linker settings include: -lglut32 -lglu32 -lopengl32
3. Press Build & Run (F9)

Using g++ (Command Line)

g++ main.cpp -o windmill -lglut32 -lglu32 -lopengl32
./windmill

Note: On Linux, replace -lglut32 -lglu32 -lopengl32 with -lglut -lGLU -lGL

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🎮 Controls

Scene Controls

Key	Action
D	Switch to Day mode
N	Switch to Night mode
A	Start Rain
C	Stop Rain

Red Car Controls

Key	Action
F	Speed up
B	Slow down / reverse
H	Stop the car

Blue Car Controls

Key	Action
X	Speed up
Y	Slow down / reverse
Z	Stop the car

Windmill Controls

Key	Action
L	Rotate anticlockwise
R	Rotate clockwise
S	Stop rotation

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✨ Features & Animation Details

• Day/Night Cycle: The sun automatically arcs across the sky. When it sets, the scene transitions to night — sky darkens, stars and moon appear, and all object colors shift to night variants.
• Windmill Rotation: Blades spin continuously using an idle callback and a global spin variable updated each frame.
• Moving Cars: The red car moves right-to-left; the blue car moves left-to-right. Both loop seamlessly off-screen.
• Animated Clouds: Five clouds drift in alternating directions and wrap around the viewport.
• Rain Effect: Randomly placed line segments simulate falling rain when toggled on.
• Viewport: 1200×600 window with a 1000×500 orthographic coordinate space.

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🐛 Known Issues

• Rain rendering uses OpenGL calls outside the main display() function, which may cause flickering on some systems.
• Color values slightly above 1.0 (e.g. glColor3f(0.533, 1.293, 0.0)) are clamped by OpenGL — these are intentional stylistic choices in the original code.
• Night mode triggered by pressing N uses glutIdleFunc(night) which may conflict with windmill idle callbacks.

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👤 Author

Ahadul Islam Chowdhury - Computer Graphics course project — Windmill Countryside scene.