AIM:
To write a program for ellipse generation.
ALGORITHM:
Step 1: Start.
Step 2: Initialize the graphics header files and functions.
Step 3: Declare the required variables and functions.
Step 4: Get the co-ordinates and radius of the ellipse.
Step 5: Draw the ellipse using the algorithm.
Step 6: Display the output.
Step 7: stop.
PROGRAM CODE:
#include <stdio.h>
#include <conio.h>
#include <math.h>
#include <graphics.h>
void main()
{ int gd=DETECT,gm; int xcenter,ycenter,rx,ry; int p,x,y,px,py,rx1,ry1,rx2,ry2; initgraph(&gd,&gm,"c:turboc3bgi"); printf("n Enter The Radius Value:"); scanf("%d%d",&℞,&ry); printf("n Enter The xcenter and ycenter Values:"); scanf("%d%d",&xcenter,&ycenter); ry1=ry*ry; rx1=rx*rx; ry2=2*ry1; rx2=2*rx1; x=0; y=ry; plotpoints(xcenter,ycenter,x,y); p=(ry1-rx1*ry+(0.25*rx1)); px=0; py=rx2*y; while(px<py) { x=x+1; px=px+ry2; if(p>=0) y=y-1; py=py-rx2; if(p<0) p=p+ry1+px; else p=p+ry1+px-py; plotpoints(xcenter,ycenter,x,y); p=(ry1*(x+0.5)*(x+0.5)+rx1*(y-1)*(y-1)-rx1*ry1); while(y>0) { y=y-1; py=py-rx2; if(p<=0) { x=x+1; px=px+ry2; } if(p>0) p=p+rx1-py; else p=p+rx1-py+px; plotpoints(xcenter,ycenter,x,y); } } getch();
}
int plotpoints(int xcenter,int ycenter,int x,int y)
{ putpixel(xcenter+x,ycenter+y,6); putpixel(xcenter-x,ycenter+y,6); putpixel(xcenter+x,ycenter-y,6); putpixel(xcenter-x,ycenter-y,6);
}
OUTPUT:
RESULT:
Thus the program for ellipse generation is written and executed successfully.
