Program to implement DDA Line generation algorithm for all 4 quadrants of a plane (x and y axis should meet at centre(320,240) i.e., Origin O(0,0) of user coordinate system)-MASTER GUIDE

Program to implement DDA Line generation algorithm for all 4 quadrants of a plane (x and y axis should meet at centre(320,240) i.e., Origin O(0,0) of user coordinate system) 

#include<graphics.h>

#include<math.h>

void main()

{

int gd=DETECT,gm;

int x1,y1,x2,y2,dx,dy,steps,k;

float xinc,yinc,x,y;

initgraph(&gd,&gm,"C:\\TURBOC3\\BGI");

cleardevice();

printf("Enter the starting point of the line:");

scanf("%d%d",&x1,&y1);

printf("Enter ending point of the line:");

scanf("%d%d",&x2,&y2);

if(x1==x2 && y1==y2)

{

printf("Both ends points are same,line cannot be drawn");

getch();

closegraph();

}

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;

x=x1;

y=y1;

line(0,240,640,240);

line(320,0,320,480);

outtextxy(320+10,240-10,"(0,0)");

putpixel(320+x,240-y,RED);

for(k=0;k<steps;k++)

{

x+=xinc;

y+=yinc;

putpixel(320+floor(x+0.5),240-floor(y+0.5),RED);

delay(50);

}

getch();

closegraph();

}

OUTPUT: