line-rgb.c File Reference

Introduction to RGB color gradients using pixel drawing. More...

#include "gfx/simplegfx.h"

Functions
int	main ()

Detailed Description

Introduction to RGB color gradients using pixel drawing.

Author

Sukesh Ashok Kumar

This simple yet powerful example demonstrates the fundamentals of RGB color theory by creating a smooth color gradient along a horizontal line. Each pixel transitions from pure magenta (full red + blue) to pure blue, showing how colors blend.

Mathematical Concepts:

• Linear interpolation: smoothly transitioning between values
• Inverse relationships: as one value increases, another decreases
• Color space mapping: discrete values (0-255) for continuous colors

Programming Concepts:

• RGB color model (Red, Green, Blue channels)
• Each channel ranges from 0 (none) to 255 (maximum)
• Coordinate offset for positioning
• Single loop for sequential pixel drawing

What you'll learn:

• Understanding RGB color components
• How to create color gradients programmatically
• Using gfx_putpixel_color(x, y, r, g, b)
• Color mixing principles (red + blue = magenta/purple)
• Inverse relationships in color transitions

Color Gradient Breakdown:

• At x=0: RGB(0, 0, 255) = Pure Blue with Red increasing
• At x=128: RGB(128, 0, 127) = Purple (middle blend)
• At x=255: RGB(255, 0, 0) = Pure Red
• Green channel stays at 0 throughout, creating red-to-blue transition

Compile:

gcc line-rgb.c gfx/simplegfx.c -o output/line-rgb -lX11

Run:

./output/line-rgb

Function Documentation

main()

int main

(

)