Prog10_ColorCubeSpin.cpp

#include <stdlib.h>
#include <GL/glut.h>
#include <time.h>
GLfloat vertices[] = { -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 normals[] = { -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[] = { 0.0,0.0,0.0, 1.0,0.0,0.0,1.0,1.0,0.0, 0.0,1.0,0.0,
                     0.0,0.0,1.0, 1.0,0.0,1.0, 1.0,1.0,1.0, 0.0,1.0,1.0 };

GLubyte cubeIndicies[]={ 0,3,2,1,2,3,7,6,0,4,7,3,1,2,6,5,4,5,6,7,0,1,5,4 };//FBLRBkT

static GLfloat theta[]={0.0,0.0,0.0};
static GLint axis = 2;
void delay(float secs){
  float end=clock()/CLOCKS_PER_SEC + secs;
  while((clock()/CLOCKS_PER_SEC) < end);
}
void display(void){
  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  glLoadIdentity();
  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);
  glDrawElements(GL_QUADS,24,GL_UNSIGNED_BYTE,cubeIndicies);
  glBegin(GL_LINES);
  glVertex3f(0.0, 0.0, 0.0);
  glVertex3f(1.0, 1.0, 1.0);
  glEnd();
  glFlush();
}
void spinCube(){
  delay(0.01);
  theta[axis]+=2;
  if(theta[axis] >360.0) theta[axis] -= 360.0;
  glutPostRedisplay();
}
void mouse(int btn, int state, int x, int y)
{
	if (btn == GLUT_LEFT_BUTTON && state == GLUT_DOWN) axis = 0;
	if (btn == GLUT_MIDDLE_BUTTON && state == GLUT_DOWN) axis = 1;
	if (btn == GLUT_RIGHT_BUTTON && state == GLUT_DOWN) axis = 2;
}
void myReshape(int w,int h){
  glViewport(0, 0, w, h);
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	if (w <= h)
		glOrtho(-2.0, 2.0, -2.0 * (GLfloat)h / (GLfloat)w, 2.0 * (GLfloat)h / (GLfloat)w, -10.0, 10.0);
	else
		glOrtho(-2.0 * (GLfloat)w / (GLfloat)h, 2.0 * (GLfloat)w / (GLfloat)h, -2.0, 2.0, -10.0, 10.0);
	glMatrixMode(GL_MODELVIEW);
}
int  main(int argc, char** argv)
{
	glutInit(&argc, argv);
	glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
	glutInitWindowPosition(100, 100);
	glutInitWindowSize(500, 500);
	glutCreateWindow("colorcube");
	glutReshapeFunc(myReshape);
	glutDisplayFunc(display);
	glutIdleFunc(spinCube);
	glutMouseFunc(mouse);
	glEnable(GL_DEPTH_TEST); /* Enable hidden--surface--removal */
	glEnableClientState(GL_COLOR_ARRAY);
	glEnableClientState(GL_NORMAL_ARRAY);
	glEnableClientState(GL_VERTEX_ARRAY);
	glVertexPointer(3, GL_FLOAT, 0, vertices);
	glColorPointer(3, GL_FLOAT, 0, colors);
	glNormalPointer(GL_FLOAT, 0, normals);
	glColor3f(1.0, 1.0, 1.0);
	glutMainLoop();
}