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# Program to fill different types of geometric shapes using Flood Fill Algorithm (Using Linked-List)

Posted By: Easy Tutor     Category: C++ Programming     Views: 18840

## Code for Program to fill different types of geometric shapes using Flood Fill Algorithm (Using Linked-List) in C++ Programming

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

void show_screen( );

void FloodFill(constint,constint,constint,constint);

void Circle(constint,constint,constint);
void Triangle(constint,constint,constint,constint,constint,constint);
void Rectangle(constint,constint,constint,constint);
void Polygon(constint,constint []);
void Line(constint,constint,constint,constint);

int main( )
{
int driver=VGA;
int mode=VGAHI;

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

show_screen( );

setcolor(15);
Circle(175,175,50);

FloodFill(175,175,10,0);

setcolor(15);
settextstyle(0,0,1);
outtextxy(150,235,"Circle");

setcolor(15);
Rectangle(350,135,500,225);

FloodFill(425,175,9,0);

setcolor(15);
settextstyle(0,0,1);
outtextxy(390,235,"Rectangle");

setcolor(15);
Triangle(125,370,225,370,175,280);

FloodFill(175,325,8,0);

setcolor(15);
settextstyle(0,0,1);
outtextxy(145,380,"Triangle");

int polygon_points[14]={ 340,330, 390,285, 460,285, 510,330,
460,375, 390,375, 340,330 };

setcolor(15);
Polygon(7,polygon_points);

FloodFill(425,325,12,0);

setcolor(15);
settextstyle(0,0,1);
outtextxy(397,380,"Polygon");

getch( );
return 0;
}

/*************************************************************************///----------------------------  FloodFill( )  ---------------------------///*************************************************************************/struct Pixel
{
int x;
int y;

Pixel *Next;
};

Pixel *Entry=NULL;
Pixel *Start=NULL;
Pixel *Last=NULL;

void insert_pixel(constint x,constint y)
{
Entry=new Pixel;

Entry->x=x;
Entry->y=y;

Entry->Next=NULL;
Last->Next=Entry;
Last=Entry;
}

void FloodFill(constint _x,constint _y,
constint fill_color,constint old_color)
{
if(old_color==fill_color)
return;

int x=_x;
int y=_y;

Start=new Pixel;

Start->x=x;
Start->y=y;

Start->Next=NULL;
Last=Start;

while(Start!=NULL)
{
putpixel(x,y,fill_color);

if(getpixel((x-1),y)==old_color && (x-1)>=0)
{
putpixel((x-1),y,fill_color);

insert_pixel((x-1),y);
}

if(getpixel(x,(y-1))==old_color && (y-1)>=0)
{
putpixel(x,(y-1),fill_color);

insert_pixel(x,(y-1));
}

if(getpixel((x+1),y)==old_color && (x+1)<=getmaxx( ))
{
putpixel((x+1),y,fill_color);

insert_pixel((x+1),y);
}

if(getpixel(x,(y+1))==old_color && (y+1)<=getmaxy( ))
{
putpixel(x,(y+1),fill_color);

insert_pixel(x,(y+1));
}

Entry=Start;
Start=Start->Next;

x=Start->x;
y=Start->y;

delete Entry;
}
}

/*************************************************************************///------------------------------  Circle( )  ----------------------------///*************************************************************************/void Circle(constint h,constint k,constint 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);
}

/*************************************************************************///----------------------------  Triangle( )  ----------------------------///*************************************************************************/void Triangle(constint x_1,constint y_1,constint x_2,constint y_2,
constint x_3,constint y_3)
{
Line(x_1,y_1,x_2,y_2);
Line(x_2,y_2,x_3,y_3);
Line(x_3,y_3,x_1,y_1);
}

/*************************************************************************///---------------------------  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);
}

/*************************************************************************///-----------------------------  Polygon( )  ----------------------------///*************************************************************************/void Polygon(constint n,constint 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(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( )
{
setfillstyle(1,1);
bar(230,26,405,38);

settextstyle(0,0,1);
setcolor(15);
outtextxy(5,5,"******************************************************************************");
outtextxy(5,17,"*-**************************************************************************-*");
outtextxy(5,29,"*--------------------------                        --------------------------*");
outtextxy(5,41,"*-**************************************************************************-*");
outtextxy(5,53,"*-**************************************************************************-*");

setcolor(11);
outtextxy(237,29,"Flood Fill Algorithm");

setcolor(15);

for(int count=0;count<=30;count++)
outtextxy(5,(65+(count*12)),"*-*                                                                        *-*");

outtextxy(5,438,"*-**************************************************************************-*");
outtextxy(5,450,"*-------------------------                          -------------------------*");
outtextxy(5,462,"******************************************************************************");

setcolor(12);
outtextxy(229,450,"Press any Key to exit.");
}

```
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