# include <iostream.h> # include <graphics.h> # include <conio.h> # include <math.h> void show_screen( ); void Polygon(const int,const int []); void Line(const int,const int,const int,const int); int main( ) { int driver=VGA; int mode=VGAHI; int n=0; do { show_screen( ); gotoxy(8,10); cout<<\"Number of Points : n :\"; gotoxy(8,11); cout<<\"ÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ\"; gotoxy(12,13); cout<<\"Enter the value of n (n>=3) : \"; cin>>n; int *coordinates=new int[(n*2)]; for(int count=0;count<n;count++) { gotoxy(8,18); cout<<\"Coordinates of Point-\"<<(count+1)<<\" (x\"<<(count+1)<<\",y\"<<(count+1)<<\") :\"; gotoxy(8,19); cout<<\"ÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ\"; gotoxy(12,21); cout<<\"Enter the value of x\"<<(count+1)<<\" = \"; cin>>coordinates[(count*2)]; gotoxy(12,22); cout<<\"Enter the value of y\"<<(count+1)<<\" = \"; cin>>coordinates[((count*2)+1)]; gotoxy(8,18); cout<<\" \"; gotoxy(12,21); cout<<\" \"; gotoxy(12,22); cout<<\" \"; } initgraph(&driver,&mode,\"..\\\\Bgi\"); setcolor(15); Polygon(n,coordinates); delete coordinates; 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; } //----------------------------- Polygon( ) ----------------------------// void Polygon(const int n,const int coordinates[]) { if(n>=2) { Line(coordinates[0],coordinates[1], coordinates[2],coordinates[3]); for(int count=1;count<(n-1);count++) Line(coordinates[(count*2)],coordinates[((count*2)+1)], coordinates[((count+1)*2)], coordinates[(((count+1)*2)+1)]); } } //------------------------------- 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(\" Polygon \"); textbackground(8); cprintf(\" ----------------------------------*\"); cprintf(\"*********************************- -**********************************\"); cprintf(\"*-****************************************************************************-*\"); for(int count=0;count<42;count++) cprintf(\"*-* *-*\"); gotoxy(1,46); cprintf(\"*-****************************************************************************-*\"); cprintf(\"*------------------------------------------------------------------------------*\"); cprintf(\"********************************************************************************\"); gotoxy(1,2); }