Bressenhams.c

#include<stdio.h>
#include<conio.h>
#include<graphics.h>
#include<math.h>
#include<dos.h>

void main()
{
int x,y,xa,ya,xb,yb,dx,dy,choice,p;
float xinc,yinc;
int gd = DETECT,gm;
initgraph(&gd,&gm,"c:\\tc\\bgi");
cleardevice();
printf("Enter the co-ordinates of the starting point of the line");
scanf("%d%d",&xa,&ya);
printf("Enter the co-ordinates of the end point of the line");
scanf("%d%d",&xb,&yb);

dx=(xb-xa);
dy=(yb-ya);

p=2*dy-dx;

x=xa;
y=yb;

int i = 0;

printf("Enter Type Of line:\n 1.Continuos \n 2.Dotted \n 3.Dashed");
scanf("%d",&choice);
switch(choice) {

case 1:

while (x!=xa && y!=yb) {
  putpixel(x,y,1);
  if (p<0) {
    x++;
    p += 2*dy;
  }
  if (p>=0) {
    x++;
    y++;
    p += (2*dy-2*dx);
  }
  i++;
}

break;

case 2:
  
while (x!=xa && y!=yb) {
  if(i%2==0) putpixel(x,y,1);
  if (p<0) {
    x++;
    p += 2*dy;
  }
  if (p>=0) {
    x++;
    y++;
    p += (2*dy-2*dx);
  }
  i++;
}

break;

case 3:
  
while (x!=xa && y!=yb) {
  if(i%5!=0) putpixel(x,y,1);
  if (p<0) {
    x++;
    p += 2*dy;
  }
  if (p>=0) {
    x++;
    y++;
    p += (2*dy-2*dx);
  }
  i++;
}

break;

}

getch();
closegraph();

}