Bresenham line drawing algorithm takes 2 coordinates and their starting and ending point to draw a line or a slope by considering the screen as a graph.
In this, the points are (X1, Y1) which is the starting point and (X2, Y2) which is the ending point. Where X2 can’t be smaller than X1.
Also Read : C program to draw a line using DDA algorithm in computer graphics
The code of this algorithm in C language is given below.
C Program to draw a line using Bresenham Line Drawing Algorithm
#include<graphics.h> #include<stdio.h> void main() { int x,y,x1,y1,delx,dely,m,grtr_d,smlr_d,d; int gm,gd=DETECT; initgraph(&gd,&gm,"C:\\TC\\BGI"); printf("******* BRESENHAM'S LINE DRAWING ALGORITHM *****\n\n"); printf("enter initial coordinate = "); scanf("%d %d",&x,&y); printf("enter final coordinate = "); scanf("%d %d",&x1,&y1); delx=x1-x; dely=y1-y; grtr_d=2*dely-2*delx; // when d > 0 smlr_d=2*dely; // when d< 0 d=(2*dely)-delx; do{ putpixel(x,y,1); if(d<0) { d=smlr_d+d; } else { d=grtr_d+d; y=y+1; } x=x+1; }while(x<x1); getch(); }