Bresenham's Line algorithm

Draw a line using Bresenham's Line algorithm

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EXPT2A.CLast updated: Mar 11, 2026

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Bresenham's Line algorithm

Explanation

This C program demonstrates Bresenham's Line Algorithm, a fundamental technique in computer graphics for drawing lines. It uses the graphics.h library, a common library in older C/C++ compilers (like Turbo C/C++) for simple graphical operations.

The program works in two main parts:

Setting up the Graphics Environment: The main function initializes the graphics mode, which essentially opens a graphical window where drawing can occur.
Drawing the Line: The lineBres function contains the core logic of Bresenham's algorithm. It takes two points ((xa, ya) and (xb, yb)) and calculates which pixels should be turned "on" to form a straight line between them

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Bresenham's Line algorithm

Explanation

This C program demonstrates Bresenham's Line Algorithm, a fundamental technique in computer graphics for drawing lines. It uses the graphics.h library, a common library in older C/C++ compilers (like Turbo C/C++) for simple graphical operations.

The program works in two main parts:

Setting up the Graphics Environment: The main function initializes the graphics mode, which essentially opens a graphical window where drawing can occur.
Drawing the Line: The lineBres function contains the core logic of Bresenham's algorithm. It takes two points ((xa, ya) and (xb, yb)) and calculates which pixels should be turned "on" to form a straight line between them