Circle Drawing Algorithms - Mid Point Algorithm Apr 10, 2006 • Rohit Graphics //Program to plot a circle by Mid-Point Approach #include <iostream.h> #include <graphics.h> #include <math.h> #include <conio.h> void drawcircle(int x1, int y1, int r) { int x=0,y=r,d; d=1-r; while (x<y) { if (d<0) { d+=2*x+3; x++; } else { x++,y--; d+=2*x+5-2*y; } putpixel(x+getmaxx()/2+x1,y+getmaxy()/2-y1,5); putpixel(-x+getmaxx()/2+x1 ,y+getmaxy()/2-y1,5); putpixel(x+getmaxx()/2+x1,-y+getmaxy()/2-y1,5); putpixel(-x+getmaxx()/2+x1,-y+getmaxy()/2-y1,5); putpixel(y+getmaxx()/2+x1,x+getmaxy()/2-y1,5); putpixel(-y+getmaxx()/2+x1,x+getmaxy()/2-y1,5); putpixel(y+getmaxx()/2+x1,-x+getmaxy()/2-y1,5); putpixel(-y+getmaxx()/2+x1,-x+getmaxy()/2-y1,5); } } void main() { int x1, y1, r; int gdriver = DETECT, gmode, errorcode; initgraph(&gdriver, &gmode, ""); line(0,getmaxy()/2,getmaxx(),getmaxy()/2); line(getmaxx()/2,0,getmaxx()/2,getmaxy()); cout<<"Enter x1 "; cin>>x1; cout<<"Enter y1 "; cin>>y1; cout<<"Enter r "; cin>>r; drawcircle(x1,y1,r); getch(); } Add reply Click here to reply to the blog post instead Send