- Code:
/*************************************************************************/
/*************************************************************************
A C++ program to illustrate the implementation of Translation Transformation.
*************************************************************************/
/*************************************************************************/
/*************************************************************************
/*************************************************************************/
/*************************************************************************/
//--------------------------- Header Files ----------------------------//
/*************************************************************************/
/*************************************************************************/
# include <iostream.h>
# include <graphics.h>
# include <conio.h>
# include <math.h>
/*************************************************************************/
/*************************************************************************/
//----------------------- Function Prototypes -------------------------//
/*************************************************************************/
/*************************************************************************/
void show_screen( );
void apply_translation(const int,int [],const int,const int);
void multiply_matrices(const int[3],const int[3][3],int[3]);
void Polygon(const int,const int []);
void Line(const int,const int,const int,const int);
/*************************************************************************/
/*************************************************************************/
//------------------------------ main( ) ------------------------------//
/*************************************************************************/
/*************************************************************************/
int main( )
{
int driver=DETECT,mode;
initgraph(&driver,&mode,"c:\\tc\\Bgi");
show_screen( );
int polygon_points[8]={ 270,290, 320,190, 370,290, 270,290 };
setcolor(15);
Polygon(4,polygon_points);
setcolor(15);
settextstyle(0,0,1);
outtextxy(50,415,"*** Use Arrow Keys to apply Translation.");
int key_code_1=0;
int key_code_2=0;
char Key_1=NULL;
char Key_2=NULL;
do
{
Key_1=NULL;
Key_2=NULL;
key_code_1=0;
key_code_2=0;
Key_1=getch( );
key_code_1=int(Key_1);
if(key_code_1==0)
{
Key_2=getch( );
key_code_2=int(Key_2);
}
if(key_code_1==27)
break;
else if(key_code_1==0)
{
if(key_code_2==72)
{
setfillstyle(1,0);
bar(40,70,600,410);
apply_translation(4,polygon_points,0,-25);
setcolor(10);
Polygon(4,polygon_points);
}
else if(key_code_2==75)
{
setfillstyle(1,0);
bar(40,70,600,410);
apply_translation(4,polygon_points,-25,0);
setcolor(12);
Polygon(4,polygon_points);
}
else if(key_code_2==77)
{
setfillstyle(1,0);
bar(40,70,600,410);
apply_translation(4,polygon_points,25,0);
setcolor(14);
Polygon(4,polygon_points);
}
else if(key_code_2==80)
{
setfillstyle(1,0);
bar(40,70,600,410);
apply_translation(4,polygon_points,0,25);
setcolor(9);
Polygon(4,polygon_points);
}
}
}
while(1);
return 0;
}
/*************************************************************************/
/*************************************************************************/
//------------------------ Funcion Definitions ------------------------//
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
//------------------------ apply_translation( ) -----------------------//
/*************************************************************************/
void apply_translation(const int n,int coordinates[],
const int Tx,const int Ty)
{
for(int count_1=0;count_1
{
int matrix_a[3]={coordinates[(count_1*2)],
coordinates[((count_1*2)+1)],1};
int matrix_b[3][3]={ {1,0,0} , {0,1,0} ,{ Tx,Ty,1} };
int matrix_c[3]={0};
multiply_matrices(matrix_a,matrix_b,matrix_c);
coordinates[(count_1*2)]=matrix_c[0];
coordinates[((count_1*2)+1)]=matrix_c[1];
}
}
/************************************************************************/
//---------------------- multiply_matrices( ) ------------------------//
/************************************************************************/
void multiply_matrices(const int matrix_1[3],
const int matrix_2[3][3],int matrix_3[3])
{
for(int count_1=0;count_1<3;count_1++)
{
for(int count_2=0;count_2<3;count_2++)
matrix_3[count_1]+=
(matrix_1[count_2]*matrix_2[count_2][count_1]);
}
}
/*************************************************************************/
//----------------------------- 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
{
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(205,26,430,38);
settextstyle(0,0,1);
setcolor(15);
outtextxy(5,5,"******************************************************************************");
outtextxy(5,17,"*-**************************************************************************-*");
outtextxy(5,29,"*---------------------- -----------------------*");
outtextxy(5,41,"*-**************************************************************************-*");
outtextxy(5,53,"*-**************************************************************************-*");
setcolor(11);
outtextxy(210,29,"Translation Transformation");
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.");
}
/*************************************************************************/
/*************************************************************************/
//----------------------------- THE END -------------------------------//
/*************************************************************************/
/*************************************************************************/