3D Rotation using OpenGL in C++

3D Roataion in OpenGL in C++
Code Updated : 25/07/2014 @ 06:16 AM
There are small changes occur…

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#include 
#include
#include
#include

typedef struct{float x;float y;}Point2D;
typedef struct{float x;float y;float z;}Point3D;


Point3D A,B,C,D,E,F,G,H;
Point2D Projected_A,Projected_B,Projected_C,Projected_D,Projected_E,Projected_F,Projected_G,Projected_H;

GLfloat v_list[8][3];
GLint f_list[6][4];

void init(void)
{

v_list[0][0] = 100;
v_list[0][1] = 100;
v_list[0][2] = 100;

v_list[1][0] = 300;
v_list[1][1] = 100;
v_list[1][2] = 100;

v_list[2][0] = 300;
v_list[2][1] = 300;
v_list[2][2] = 100;

v_list[3][0] = 100;
v_list[3][1] = 300;
v_list[3][2] = 100;

v_list[4][0] = 100;
v_list[4][1] = 100;
v_list[4][2] = 300;

v_list[5][0] = 300;
v_list[5][1] = 100;
v_list[5][2] = 300;

v_list[6][0] = 300;
v_list[6][1] = 300;
v_list[6][2] = 300;

v_list[7][0] = 100;
v_list[7][1] = 300;
v_list[7][2] = 300;







}

void rotatebox_x(float deg_x){
float ang = deg_x * 3.14159265359 / 180.0;

for (int i = 0; i <= 7; i++) {
v_list[i][0] = v_list[i][0];
v_list[i][2] = v_list[i][2]*cos(ang) - v_list[i][1]*sin(ang);
v_list[i][1] = v_list[i][2]*sin(ang) + v_list[i][1]*cos(ang);
}
glutPostRedisplay();
}

void rotatebox_y(float deg_y){
float ang = deg_y * 3.14159265359 / 180.0;

for (int i = 0; i <= 7; i++) {
v_list[i][1] = v_list[i][1];
v_list[i][0] = v_list[i][0]*cos(ang) - v_list[i][2]*sin(ang);
v_list[i][2] = v_list[i][0]*sin(ang) + v_list[i][2]*cos(ang);
}
glutPostRedisplay();
}

Point2D Project_ortho(float x, float y, float z){
Point2D p0;
p0.x = x ;
p0.y = y ;
return p0;
}

void drawBox(Point2D A, Point2D B, Point2D C, Point2D D, Point2D E, Point2D F, Point2D G, Point2D H)
{

glPointSize(1.0);

glBegin(GL_LINE_LOOP);
glVertex2i(A.x, A.y); glVertex2i(B.x, B.y); glVertex2i(C.x, C.y); glVertex2i(D.x, D.y);
glEnd();

glBegin(GL_LINE_LOOP);

glVertex2i(E.x, E.y); glVertex2i(F.x, F.y); glVertex2i(G.x, G.y); glVertex2i(H.x, H.y);
glEnd();

glBegin(GL_LINES);

glVertex2i(A.x, A.y); glVertex2i(E.x, E.y);

glVertex2i(B.x, B.y); glVertex2i(F.x, F.y);

glVertex2i(C.x, C.y); glVertex2i(G.x, G.y);

glVertex2i(D.x, D.y); glVertex2i(H.x, H.y);
glEnd();

glFlush();
}

void draw_Cube(){
Projected_A = Project_ortho(v_list[0][0],v_list[0][1],v_list[0][1]);
Projected_B = Project_ortho(v_list[1][0],v_list[1][1],v_list[1][1]);
Projected_C = Project_ortho(v_list[2][0],v_list[2][1],v_list[2][1]);
Projected_D = Project_ortho(v_list[3][0],v_list[3][1],v_list[3][1]);
Projected_E = Project_ortho(v_list[4][0],v_list[4][1],v_list[4][1]);
Projected_F = Project_ortho(v_list[5][0],v_list[5][1],v_list[5][1]);
Projected_G = Project_ortho(v_list[6][0],v_list[6][1],v_list[6][1]);
Projected_H = Project_ortho(v_list[7][0],v_list[7][1],v_list[7][1]);

drawBox(Projected_A,Projected_B,Projected_C,Projected_D,Projected_E,Projected_F,Projected_G,Projected_H);

}

void myDisplay()
{
glClearColor(1.0f, 1.0f, 1.0f, 0.0f);
glClear(GL_COLOR_BUFFER_BIT);
glColor3f(1.0f, 0.0f, 0.0f);
draw_Cube();
}


void keyboard(unsigned char key, int x, int y)
{
if (key == 'q' || key == 'Q')
exit(EXIT_SUCCESS);
}

void special(int key, int, int) {
switch (key) {
case GLUT_KEY_LEFT: rotatebox_y(-1); break;
case GLUT_KEY_RIGHT: rotatebox_y(1);break;
case GLUT_KEY_UP: rotatebox_x(-1);break;
case GLUT_KEY_DOWN: rotatebox_x(1);break;
default: return;
}
}

int main( int argc, char ** argv ) {
glutInit( &argc, argv );
glutInitWindowPosition( 0, 0 );
glutInitWindowSize( 800, 600 );
glutCreateWindow( "3D Transformations" );

glMatrixMode( GL_PROJECTION );
glLoadIdentity();
gluOrtho2D( 0, 800, 0, 600 );
glViewport(0, 0, 800, 600);

init();

glutKeyboardFunc(keyboard);
glutSpecialFunc(special);
glutDisplayFunc( myDisplay );
glutMainLoop();

return( 0 );
}
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