download this file : dda.c
program:
#include"stdio.h"
#include"conio.h"
#include"stdlib.h"
#include"graphics.h"
#include"dos.h"
#include"math.h"
void main()
{
int i,gd,gm,delay=1;
float dx,dy,x1,x2,y1,y2,step,maxx,maxy,roundx,roundy;
float x,y,xi,yi;
char buf1[50],buf2[50],buf3[50],buf4[10],buf5[10];
clrscr();
gd=DETECT;
printf("\n Enter start co-ordinates (x1,y1) :");
scanf("%f%f",&x1,&y1);
printf("\n Enter end co-ordinates (x2,y2) :");
scanf("%f%f",&x2,&y2);
clrscr();
x1+=100;
x2+=100;
y1+=100;
y2+=100;
initgraph(&gd,&gm,"");
dx=x2-x1;
dy=y2-y1;
maxx=getmaxx();
maxy=getmaxy();
line(100,0,100,maxy);
line(0,100,maxx,100);
outtextxy(80,90,"0");
outtextxy(80,200,"100");
outtextxy(80,300,"200");
outtextxy(80,400,"300");
outtextxy(80,500,"400");
outtextxy(180,90,"100");
outtextxy(280,90,"200");
outtextxy(380,90,"300");
outtextxy(480,90,"400");
outtextxy(580,90,"500");
sprintf(buf1," DDA LINE ALGORITHM ");
outtextxy(300,10,buf1);
sprintf(buf2,"x1=%3.0f,y1=%3.0f,x2=%3.0f,y2=%3.0f,",x1-100,y1-100,x2-100,y2-100);
outtextxy(200,20,buf2);
if(abs(dx)>abs(dy))
step=dx;
else
step=dy;
xi = dx / step;
yi = dy / step;
sprintf(buf3,"dx=%3.0f,dy=%3.0f,step=%3.0f,xi=%3.2f,yi=%3.2f",dx,dy,step,xi,yi);
outtextxy(200,30,buf3);
x=x1;
y=y1;
putpixel(x,y,delay);
circle(x,y,2);
sprintf(buf4,"(%3.0f,%3.0f)",x1-100,y1-100);
outtextxy(x1+10,y1,buf4);
for(i=1;i<=step;i++)
{
if(delay==15)
{
sleep(1);
delay=1;
}
delay++;
x=x+xi;
y=y+yi;
roundx=ceil(x);
roundy=ceil(y);
putpixel(roundx,roundy,delay);
}
circle(roundx,roundy,2);
sprintf(buf5,"(%3.0f,%3.0f)",roundx-100,roundy-100);
outtextxy(roundx+10,roundy,buf5);
getch();
restorecrtmode();
}
download this file : dda.c
ouput:
Enter start co-ordinates (x1,y1) : 100 125
Enter end co-ordinates (x2,y2) : 250 350
