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# Program to fill a Rectangle using Scan-Line Rectangle Fill Algorithm

Posted By: Easy Tutor     Category: C++ Programming     Views: 15485

## Code for Program to fill a Rectangle using Scan-Line Rectangle Fill Algorithm in C++ Programming

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

void show_screen( );

void Fill_rectangle(constint,constint,constint,constint);

void Rectangle(constint,constint,constint,constint);
void Line(constint,constint,constint,constint);

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(constint x_1,constint y_1,constint x_2,constint 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(constint x_1,constint y_1,constint x_2,constint 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(constint x_1,constint y_1,constint x_2,constint 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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 Easy Tutor author of Program to fill a Rectangle using Scan-Line Rectangle Fill Algorithm is from United States. Easy Tutor says Hello Friends,I am Free Lance Tutor, who helped student in completing their homework. I have 4 Years of hands on experience on helping student in completing their homework. I also guide them in doing their final year projects.I have share many programs on this website for everyone to use freely, if you need further assistance, than please contact me on easytutor.2ya [at the rate] gmail [dot] comI have special discount scheme for providing tutor services. I am providing tutor service to students from various contries, currently most of my students are from United States, India, Australia, Pakistan, Germany, UK and Canada. I am also here to expand my technical network to receive more opportunity in my career, make friends to help them in resolving their technical problem, learn and share my knowledge, If you like to be my friend, Please send me friend request.Thanks,Happy Programming :) View All Articles

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