计算机图形学实验－旋转的多面体

#include <stdlib.h> #include <GL/glut.h> #include <iostream> using std::cout; using std::cin; using std::endl; GLfloat vertices[][3] = {{-1.0,-1.0,-1.0},{1.0,-1.0,-1.0}, {1.0,1.0,-1.0}, {-1.0,1.0,-1.0}, {-1.0,-1.0,1.0}, {1.0,-1.0,1.0}, {1.0,1.0,1.0}, {-1.0,1.0,1.0}}; GLfloat colors[][3] = {{1.0,0.0,0.0},{1.0,0.0,0.0}, {1.0,0.0,0.0}, {0.0,1.0,0.0}, {0.0,0.0,1.0}, {1.0,1.0,1.0}, {0.0,0.0,1.0}, {0.0,1.0,1.0}}; void polygon(int a, int b, int c , int d) { glBegin(GL_POLYGON); glColor3fv(colors[a]); glVertex3fv(vertices[a]); glVertex3fv(vertices[b]); glVertex3fv(vertices[c]); glVertex3fv(vertices[d]); glEnd(); } void colorcube() { polygon(0,1,2,3); polygon(2,3,7,6); polygon(2,7,4,0); polygon(4,5,1,0); polygon(6,5,4,7); polygon(5,1,2,6); } static GLfloat theta[] = {0,0,0}; static int xMove = 0,yMove = 0,zMove = 0; static GLdouble viewer[]= {5.0, 5.0, 5.0}; void display() { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); /* update viewer position in model-view matrix */ glLoadIdentity(); gluLookAt(viewer[0],viewer[1],viewer[2], 0.0, 0.0, 0.0, 0.0, 1.0, 0.0); /* rotate cube */ glRotatef(theta[0], 1.0, 0.0, 0.0); glRotatef(theta[1], 0.0, 1.0, 0.0); glRotatef(theta[2], 0.0, 0.0, 1.0); glTranslatef (xMove,yMove,zMove); colorcube(); glFlush(); glutSwapBuffers(); } void Translate() { cout<<"Enter the x position you want cube to move "<<endl; cin>>xMove; cout<<"Enter the x position you want cube to move "<<endl; cin>>yMove; cout<<"Enter the x position you want cube to move "<<endl; cin>>zMove; } void mouse(int btn, int state, int x, int y) { if(btn==GLUT_LEFT_BUTTON && state == GLUT_DOWN) theta[2] += 2.0; if(btn==GLUT_RIGHT_BUTTON && state == GLUT_DOWN) theta[2] -= 2.0; if(btn==GLUT_MIDDLE_BUTTON && state == GLUT_DOWN) Translate(); if( theta[2] > 360.0 ) theta[0] -= 360.0; if( theta[2] < 0) theta[0] += 360; display(); } void myReshape(int w, int h) { glViewport(0, 0, w, h); /* use a perspective view */ glMatrixMode(GL_PROJECTION); glLoadIdentity(); if(w<=h) glFrustum(-2.0, 2.0, -2.0 * (GLfloat) h/ (GLfloat) w, 2.0* (GLfloat) h / (GLfloat) w, 2.0, 20.0); else glFrustum(-2.0, 2.0, -2.0 * (GLfloat) w/ (GLfloat) h, 2.0* (GLfloat) w / (GLfloat) h, 2.0, 20.0); /* or we can use gluPerspective */ /* gluPerspective(45.0, w/h, 1.0, 10.0); */ glMatrixMode(GL_MODELVIEW); } void main(int argc, char **argv) { glutInit(&argc, argv); glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH); glutInitWindowSize(500, 500); glutCreateWindow("colorcube"); glutReshapeFunc(myReshape); glutDisplayFunc(display); glutMouseFunc(mouse); glEnable(GL_DEPTH_TEST); glutMainLoop(); }