C++ Programming Blog

 
 
 
 # include <iostream.h>
 # include <graphics.h>
 # include    <conio.h>
 # include     <math.h>


 void show_screen( );

 void Fill_rectangle(const int,const int,const int,const int);

 void Rectangle(const int,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_1=0;
       int y_1=0;

       int x_2=0;
       int y_2=0;

       do
      {
         show_screen( );

         gotoxy(8,10);
         cout<<\"Coordinates of Left Point (x1,y1) :\";

         gotoxy(8,11);
         cout<<\"ÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ\";

         gotoxy(12,13);
         cout<<\"Enter the value of x1 = \";
         cin>>x_1;

         gotoxy(12,14);
         cout<<\"Enter the value of y1 = \";
         cin>>y_1;

         gotoxy(8,18);
         cout<<\"Coordinates of Right Point (x2,y2) :\";

         gotoxy(8,19);
         cout<<\"ÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ\";

         gotoxy(12,21);
         cout<<\"Enter the value of x2 = \";
         cin>>x_2;

         gotoxy(12,22);
         cout<<\"Enter the value of y2 = \";
         cin>>y_2;

             int driver=VGA;
         int mode=VGAHI;
         int error_code;

         initgraph(&driver,&mode,\"..\\\\Bgi\");

         setcolor(15);
           Rectangle(x_1,y_1,x_2,y_2);

         setcolor(9);
           Fill_rectangle((x_1+1),(y_1+1),(x_2-1),(y_2-1));

         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_rectangle( )  -------------------------//


 void Fill_rectangle(const int x_1,const int y_1,const int x_2,const int y_2)
    {
       int y_min=((y_1>=y_2)?y_2:y_1);
       int y_max=((y_1<=y_2)?y_2:y_1);

       for(int count=y_min;count<=y_max;count++)
      Line(x_1,count,x_2,count);
    }


 //---------------------------  Rectangle( )  ----------------------------//


 void Rectangle(const int x_1,const int y_1,const int x_2,const int y_2)
    {
       Line(x_1,y_1,x_2,y_1);
       Line(x_2,y_1,x_2,y_2);
       Line(x_2,y_2,x_1,y_2);
       Line(x_1,y_2,x_1,y_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(\" Scan-Line Rectangle Fill Algorithm \");
       textbackground(8);

       cprintf(\" ---------------------*\");
       cprintf(\"*******************-                                      -*********************\");
       cprintf(\"*-****************************************************************************-*\");

       for(int count=0;count<42;count++)
      cprintf(\"*-*                                                                          *-*\");

       gotoxy(1,46);
       cprintf(\"*-****************************************************************************-*\");
       cprintf(\"*------------------------------------------------------------------------------*\");
       cprintf(\"********************************************************************************\");

       gotoxy(1,2);
    }

 
 
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