Question: Write a program to generate a complete moving wheel using Midpoint circle drawing
algorithm and DDA line drawing algorithm.
Code:
#include<iostream.h>
#include<conio.h>
#include<stdio.h>
#include<graphics.h>
#include<dos.h>
#include<math.h>
int u=1;
void dda(int x1, int y1, int x2, int y2) {
int s, dx, dy, m;
float xi, yi, x, y;
dx = x2 - x1;
dy = y2 - y1;
if (abs(dx) > abs(dy))
s = abs(dx); else
s = abs(dy);
xi = dx / (float) s;
yi = dy / (float) s;
x = x1;
y = y1;
putpixel(x1 + 0.5, y1 + 0.5, 15);
for (m = 0; m < s; m++) {
x += xi;
y += yi;
putpixel(x + 0.5, y + 0.5, 15);
}
}
void main(){
int g=DETECT,gmode;
initgraph(&g,&gmode,"C://TURBOC3//BGI");
int r;
cout<<"Enter Radius \n";
cin>>r;
int x=0,y=r;
int p=1-r;
int xc=50,yc=200;
while(xc<750)
{ cleardevice();
x=0;y=r;p=1-r;
while(x<y){
if(p<=0){
p=p+2*x+3;
}else{
p=p+2*(x-y)+5;
y--;
}
x++;
putpixel(xc+x,yc+y,10);
putpixel(xc+y,yc+x,10);
putpixel(xc+x,yc-y,10);
putpixel(xc-y,yc+x,10);
putpixel(xc-x,yc-y,10);
putpixel(xc+y,yc-x,10);
putpixel(xc-x,yc+y,10);
putpixel(xc-y,yc-x,10);
if(u%20==0){
dda(xc-x,yc+y,xc+x,yc-y);
dda(xc+x,yc+y,xc-x,yc-y);
dda(xc+y,yc+x,xc-y,yc-x);
dda(xc-y,yc+x,xc+y,yc-x);
}u++;
}
xc=xc+5;
delay(90);
}
getch();
}
Output:
