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 <windows.h> #include <gl/Gl.h> #include <gl/glut.h> #include <cmath> 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 ); }