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Title MIDPOINT ELIIPSE DRAWING ALGORITHM
Author RANJEET RAMUNNI
Author Email ranjeetramunni [at] gmail.com
Description THIS IS THE CODE FOR THE RASTER MIDPOINT ELLIPSE DRAWING ALGORITHM

Category C » Games and Graphics
Hits 378352
Code Select and Copy the Code
#include<stdio.h> #include<graphics.h> #include<conio.h> void putelpix(float xc,float yc,float x,float y) { putpixel((int)(xc+x),(int)(yc+y),15); putpixel((int)(xc-x),(int)(yc-y),15); putpixel((int)(xc+x),(int)(yc-y),15); putpixel((int)(xc-x),(int)(yc+y),15); } void mdpt(float xc,float yc,float rx,float ry) { float x=0,y=ry,p1,p2,t1,t2; int k; p1=ry*ry-rx*rx*ry+0.25*rx*rx; putelpix(xc,yc,x,y); for(k=0;(2*ry*ry*x)<=(2*rx*rx*y);k++) { t1=2*ry*ry*x+2*ry*ry; t2=2*rx*rx*y-2*rx*rx; if(p1<0) p1=p1+t1+ry*ry; else { p1=p1+t1-t2+ry*ry; y--; } x++; putelpix(xc,yc,x,y); } p2=ry*ry*(x+.5)*(x+.5)+rx*rx*(y-1)*(y-1)-rx*rx*ry*ry; putelpix(xc,yc,x,y); for(k=0;y>=0;k++) { t1=2*ry*ry*x+2*ry*ry; t2=2*rx*rx*y-2*rx*rx; if(p2>0) p2=p2-t2+rx*rx; else { p2=p2+t1-t2+rx*rx; x++; } y--; putelpix(xc,yc,x,y); } } void main() { int gd=DETECT,gm; float xc,yc,rx,ry; initgraph(&gd,&gm,""); printf("Enter center coordinates x,y and rx,ry "); scanf("%f%f%f%f",&xc,&yc,&rx,&ry); mdpt(xc,yc,rx,ry); getch(); closegraph(); }

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