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Program that creats a 3D solid object using Rotational Sweep Representatiom Method

Posted By: Easy Tutor     Category: C++ Programming     Views: 1997

Code for Program that creats a 3D solid object using Rotational Sweep Representatiom Method in C++ Programming

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

# define  f                 0.3
# define  projection_angle   45

void show_screen( );

void apply_rotation_along_y_axis(constint,constint,constint,constint);
void multiply_matrices(constfloat[4],constfloat[4][4],float[4]);

void draw_circle(constint,constint,constint);
void get_projected_point(int&,int&,int&);

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

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

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

show_screen( );

int x=0;
int y=250;
int z=200;

setcolor(15);
draw_circle(x,y,z);

setcolor(15);
settextstyle(0,0,1);
outtextxy(50,415,"*** Press any key to make a 3D solid object i.e. Tube.");

getch( );

for(int angle=0;angle<=360;angle++)
apply_rotation_along_y_axis(x,y,z,angle);

getch( );
return 0;
}

/*************************************************************************///-------------------  apply_rotation_along_y_axis( )  ------------------///*************************************************************************/void apply_rotation_along_y_axis(constint x,constint y,
constint z,constint theta)
{
int _x=x;
int _y=y;
int _z=z;

float angle=(theta*(M_PI/180));

float matrix_a[4]={_x,_y,_z,1};

float matrix_b[4][4]={
{ cos(angle),0,-sin(angle),0 } ,
{ 0,1,0,0 } ,
{ sin(angle),0,cos(angle),0 } ,
{ 0,0,0,1 }
};

float matrix_c[4]={0};

multiply_matrices(matrix_a,matrix_b,matrix_c);

_x=(int)(matrix_c[0]+0.5);
_y=(int)(matrix_c[1]+0.5);
_z=(int)(matrix_c[2]+0.5);

draw_circle(_x,_y,_z);
}

/************************************************************************///----------------------  multiply_matrices( )  ------------------------///************************************************************************/void multiply_matrices(constfloat matrix_1[4],
constfloat matrix_2[4][4],float matrix_3[4])
{
for(int count_1=0;count_1<4;count_1++)
{
for(int count_2=0;count_2<4;count_2++)
matrix_3[count_1]+=
(matrix_1[count_2]*matrix_2[count_2][count_1]);
}
}

/************************************************************************///--------------------------  draw_circle( )  -------------------------///************************************************************************/void draw_circle(constint x,constint y,constint z)
{
int _x=x;
int _y=y;
int _z=z;

get_projected_point(_x,_y,_z);

_x+=320;

setcolor(15);
circle(_x,_y,30);
}

/************************************************************************///---------------------  get_projected_point( )  -----------------------///************************************************************************/void get_projected_point(int& x,int& y,int& z)
{
float fcos0=(f*cos(projection_angle*(M_PI/180)));
float fsin0=(f*sin(projection_angle*(M_PI/180)));

float Par_v[4][4]={
{1,0,0,0},
{0,1,0,0},
{fcos0,fsin0,0,0},
{0,0,0,1}
};

float xy[4]={x,y,z,1};
float new_xy[4]={0};

multiply_matrices(xy,Par_v,new_xy);

x=(int)(new_xy[0]+0.5);
y=(int)(new_xy[1]+0.5);
z=(int)(new_xy[2]+0.5);
}

/*************************************************************************///--------------------------  show_screen( )  ---------------------------///*************************************************************************/void show_screen( )
{
setfillstyle(1,1);
bar(154,26,476,38);

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

setcolor(11);
outtextxy(162,29,"Rotational Sweep Representation Method");

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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