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Bresenham's Line Drawing Algorithm 


#include<stdio.h>
#include<conio.h>
#include<graphics.h>
void Bresenhams(int x1,int y1,int x2,int y2,int col,int del);
void main()
{
int gd=DETECT,gm,x1,x2,y1,y2;
initgraph(&gd,&gm,"");
printf("Enter (x1,y1) and (x2,y2) : ");
scanf("%d%d%d%d",&x1,&y1,&x2,&y2);
Bresenhams(x1,y1,x2,y2,14,20);
getch();
closegraph();
}
void Bresenhams(int x1,int y1,int x2,int y2,int col,int del)
{
int dx,dy,s,x,y;
int p,tdy,tdydx;
dx=x2-x1;
dy=y2-y1;
p=2*dy-dx;
tdy=2*dy;
tdydx=2*(dy-dx);
if(x1>x2)
{
x=x2;
y=y2;
s=x1;
}
else
{
x=x1;
y=y1;
s=x2;
}
putpixel(x,y,col);
while(x<s)
{
x++;
if(p<0)
p+=tdy;
else
{
y++;
p+=tdydx;
}
putpixel(x,y,col);
delay(del);
}
}
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