DDA ALGORITHM FOR DRAWING LINE

/************************************************************************/

#include<stdio.h>

#include<conio.h>

#include<graphics.h>

int main()

{

                int x1,y1,x2,y2,i,xincr,yincr,dx,dy,steps,x;

                float m;

                int gdriver=DETECT,gmode;

                initgraph(&gdriver,&gmode,"");

                printf("enter the coordinates of first point : ");

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

                printf("enter the coordinates of second point : ");

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

                dx=x2-x1;

                dy=y2-y1;

                if(abs(dx)>abs(dy))

                                steps=dx;

                else

                                steps=dy;

                xincr=dx/steps;

                yincr=dy/steps;

                for(i=0;i<steps;i++)

                {

                                x1+=xincr;

                                y1+=yincr;

                                putpixel(x1,y1,WHITE);

                }

                getch();

                return 0;

}

/**************************************************************************/