Program to draw a line using DDA line drawing algorithm

//Program to draw a line using DDA line drawing algorithm

#include

#include

#include

#include

#define round(a) (int) (a+0.5)

void dda(int,int,int,int);

void main() {

int gdriver=DETECT,gmode;

int x1,x2,y1,y2;

clrscr();

printf("\nEnter coordinates of end points : ");

printf("\nx1 : ");scanf("%d",&x1);

printf("y1 : ");scanf("%d",&y1);

printf("x2 : ");scanf("%d",&x2);

printf("y2 : ");scanf("%d",&y2);

initgraph(&gdriver,&gmode,"e:\\tc\\bgi");

dda(x1,y1,x2,y2);

getch();

}

void dda(int x1,int y1,int x2,int y2)

{

int dx,dy,steps,k;

float xinc,yinc,x,y;

x=x1;

y=y1;

dx=x2-x1;

dy=y2-y1;

if(abs(dx)>=abs(dy))

steps=abs(dx);

else

steps=abs(dy);

xinc=dx/(float)steps;

yinc=dy/(float)steps;

putpixel(round(x),round(y),WHITE);

for(k=0;k

x+=xinc;

y+=yinc;

putpixel(round(x),round(x),WHITE);

}

}