# include <iostream.h> # include <graphics.h> # include <conio.h> # include <math.h> void show_screen( ); void Fill_circle(const int,const int,const int); void Circle(const int,const int,const int); void Line(const int,const int,const int,const int); int main( ) { int driver=VGA; int mode=VGAHI; int x=0; int y=0; int r=0; do { show_screen( ); gotoxy(8,10); cout<<\"Coordinates of Center Point (x,y) :\"; gotoxy(8,11); cout<<\"ÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ\"; gotoxy(12,13); cout<<\"Enter the value of x = \"; cin>>x; gotoxy(12,14); cout<<\"Enter the value of y = \"; cin>>y; gotoxy(8,18); cout<<\"Radius of Circle : r :\"; gotoxy(8,19); cout<<\"ÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ\"; gotoxy(12,21); cout<<\"Enter the value of r = \"; cin>>r; initgraph(&driver,&mode,\"..\\\\Bgi\"); setcolor(15); Circle(x,y,r); setcolor(9); Fill_circle(x,y,(r-1)); setcolor(15); outtextxy(110,460,\"Press <Enter> to continue or any other key to exit.\"); int key=int(getch( )); if(key!=13) break; } while(1); return 0; } //--------------------------- Fill_circle( ) --------------------------// void Fill_circle(const int x,const int y,const int r) { int iterations=(int)((2*r*M_PI)+0.5); double angle; int x1; int y1; for(int count=0;count<=iterations;count++) { angle=(((2*M_PI*count)/iterations)+0.5); x1=int(x+(r*cos(angle))+0.5); y1=int(y+(r*sin(angle))+0.5); Line(x,y,x1,y1); } } //---------------------------- Circle( ) ------------------------------// void Circle(const int h,const int k,const int r) { int color=getcolor( ); int x=0; int y=r; int p=(1-r); do { putpixel((h+x),(k+y),color); putpixel((h+y),(k+x),color); putpixel((h+y),(k-x),color); putpixel((h+x),(k-y),color); putpixel((h-x),(k-y),color); putpixel((h-y),(k-x),color); putpixel((h-y),(k+x),color); putpixel((h-x),(k+y),color); x++; if(p<0) p+=((2*x)+1); else { y--; p+=((2*(x-y))+1); } } while(x<=y); } //------------------------------ Line( ) ------------------------------// void Line(const int x_1,const int y_1,const int x_2,const int y_2) { int color=getcolor( ); int x1=x_1; int y1=y_1; int x2=x_2; int y2=y_2; if(x_1>x_2) { x1=x_2; y1=y_2; x2=x_1; y2=y_1; } int dx=abs(x2-x1); int dy=abs(y2-y1); int inc_dec=((y2>=y1)?1:-1); if(dx>dy) { int two_dy=(2*dy); int two_dy_dx=(2*(dy-dx)); int p=((2*dy)-dx); int x=x1; int y=y1; putpixel(x,y,color); while(x<x2) { x++; if(p<0) p+=two_dy; else { y+=inc_dec; p+=two_dy_dx; } putpixel(x,y,color); } } else { int two_dx=(2*dx); int two_dx_dy=(2*(dx-dy)); int p=((2*dx)-dy); int x=x1; int y=y1; putpixel(x,y,color); while(y!=y2) { y+=inc_dec; if(p<0) p+=two_dx; else { x++; p+=two_dx_dy; } putpixel(x,y,color); } } } //-------------------------- show_screen( ) ---------------------------// void show_screen( ) { restorecrtmode( ); textmode(C4350); cprintf(\"\\n********************************************************************************\"); cprintf(\"*********************- -**********************\"); cprintf(\"*--------------------- \"); textbackground(1); cprintf(\" Scan-Line Circle Fill Algorithm \"); textbackground(8); cprintf(\" ----------------------*\"); cprintf(\"*********************- -**********************\"); cprintf(\"*-****************************************************************************-*\"); for(int count=0;count<42;count++) cprintf(\"*-* *-*\"); gotoxy(1,46); cprintf(\"*-****************************************************************************-*\"); cprintf(\"*------------------------------------------------------------------------------*\"); cprintf(\"********************************************************************************\"); gotoxy(1,2); }