/* simple shaded scene consisting of a tea pot on a table */ 
#include <GL/glut.h>

void wall (double thickness)
{
	//draw thin wall with top = xz-plane, corner at origin
	glPushMatrix();
	glTranslated (0.5, 0.5 * thickness, 0.5);
	glScaled (1.0, thickness, 1.0);
	glutSolidCube (1.0);
	glPopMatrix();
}

//draw one table leg
void tableLeg (double thick, double len)
{
	glPushMatrix();
	glTranslated (0, len/2, 0);
	glScaled (thick, len, thick);
	glutSolidCube (1.0);
	glPopMatrix();
}

void table (double topWid, double topThick, double legThick, double legLen)
{
	//draw the table - a top and four legs
	//draw the top first
	glPushMatrix();
	glTranslated (0, legLen, 0);
	glScaled(topWid, topThick, topWid);
	glutSolidCube (1.0);
	glPopMatrix();
	double dist = 0.95 * topWid/2.0 - legThick/2.0;
	glPushMatrix();
	glTranslated (dist, 0, dist);
	tableLeg (legThick, legLen);
	glTranslated (0.0, 0.0, -2 * dist);
	tableLeg (legThick, legLen);
	glTranslated (-2*dist, 0, 2 *dist);
	tableLeg (legThick, legLen);
	glTranslated(0, 0, -2*dist);
	tableLeg (legThick, legLen);
	glPopMatrix();
}

void displaySolid (void)
{
	//set properties of the surface material
	GLfloat mat_ambient[] = {0.7f, 0.7f, 0.7f, 1.0f}; // gray
	GLfloat mat_diffuse[] = {.5f, .5f, .5f, 1.0f};
	GLfloat mat_specular[] = {1.0f, 1.0f, 1.0f, 1.0f};
	GLfloat mat_shininess[] = {50.0f};
	glMaterialfv (GL_FRONT, GL_AMBIENT, mat_ambient);
	glMaterialfv (GL_FRONT, GL_DIFFUSE, mat_diffuse);
	glMaterialfv (GL_FRONT, GL_SPECULAR, mat_specular);
	glMaterialfv (GL_FRONT, GL_SHININESS, mat_shininess);

	//set the light source properties
	GLfloat lightIntensity[] = {0.7f, 0.7f, 0.7f, 1.0f};
	GLfloat light_position[] = {2.0f, 6.0f, 3.0f, 0.0f};
	glLightfv (GL_LIGHT0, GL_POSITION, light_position);
	glLightfv (GL_LIGHT0, GL_DIFFUSE, lightIntensity);

	//set the camera
	glMatrixMode (GL_PROJECTION);
	glLoadIdentity();
	double winHt = 1.0; //half-height of window
	glOrtho (-winHt * 64/48.0, winHt*64/48.0, -winHt, winHt, 0.1, 100.0);
	glMatrixMode (GL_MODELVIEW);
	glLoadIdentity();
	gluLookAt (2.3, 1.3, 2.0, 0.0, 0.25, 0.0, 0.0, 1.0, 0.0);

	//start drawing
	glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	glPushMatrix();
	glTranslated (0.4, 0.4, 0.6);
	glRotated (45, 0, 0, 1);
	glScaled (0.08, 0.08, 0.08);
	
	glPopMatrix();

	glPushMatrix();
	glTranslated (0.6, 0.38, 0.5);
	glRotated (30, 0, 1, 0);
	glutSolidTeapot (0.08);
	glPopMatrix ();
	glPushMatrix();
	glTranslated (0.25, 0.42, 0.35);
	//glutSolidSphere (0.1, 15, 15);
	glPopMatrix();
	glPushMatrix();
	glTranslated (0.4, 0, 0.4);
	table (0.6, 0.02, 0.02, 0.3);
	glPopMatrix();
	wall (0.02);
	glPushMatrix();
	glRotated (90.0, 0.0, 0.0, 1.0);
	wall (0.02);
	glPopMatrix();
	glPushMatrix();
	glRotated (-90.0, 1.0, 0.0, 0.0);
	wall (0.02);
	glPopMatrix();

	glFlush();
}

void main (int argc, char ** argv)
{
	glutInit (&argc, argv);
	glutInitDisplayMode (GLUT_SINGLE|GLUT_RGB|GLUT_DEPTH);
	glutInitWindowSize (640, 480);
	glutInitWindowPosition (100, 100);
	glutCreateWindow ("simple shaded scene consisting of a tea pot on a table");
	glutDisplayFunc (displaySolid);
	glEnable (GL_LIGHTING);
	glEnable (GL_LIGHT0);
	glShadeModel (GL_SMOOTH);
	glEnable (GL_DEPTH_TEST);
	glEnable (GL_NORMALIZE);
	glClearColor (0.1, 0.1, 0.1, 0.0);
	glViewport (0, 0, 640, 480);
	glutMainLoop();
}


/** To show the use of the timer function in GLUT
 */

#include <gl/glut.h>

void init();
void display();
void reshape ( int , int );
void timer ( int );

int
main ( int argc , char **argv ) {

	// Create the window...
	glutInit ( &argc , argv );
	glutInitDisplayMode ( GLUT_DOUBLE | GLUT_RGBA | GLUT_DEPTH );
	glutInitWindowSize ( 300 , 300 );
	glutInitWindowPosition ( 0 , 0 );
	glutCreateWindow ( "Using the timer..." );

	// Register callbacks...
	glutDisplayFunc ( display );
	glutReshapeFunc ( reshape );
	glutTimerFunc ( 100 , timer , 0 );

	init();
	glutMainLoop();

	return 0;
}

double thetha = 0.0;
unsigned int delay = 50;

void init() {
	glClearColor ( 0.0 , 0.0 , 0.0 , 1.0 );
	glDepthFunc ( GL_GREATER );
	glEnable ( GL_DEPTH );
	glEnable ( GL_LINE_SMOOTH );
}

void display() {

	glLoadIdentity();
	glClear ( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
	glColor3f ( 1.0 , 1.0 , 0.0 );
	glTranslatef ( 0.0 , -5.0 , -20.0 );

	// Draw the cone here...
	glRotatef ( thetha , 0.0 , 1.0 , 0.0 );
	glRotatef ( -90.0 , 1.0 , 0.0 , 0.0 );
	glutWireCone ( 10.0 , 15.0 , 50 , 50 );

	glutSwapBuffers();
}

void reshape ( int newWidth , int newHeight ) {
	glViewport ( 0 , 0 , newWidth , newHeight );
	glMatrixMode ( GL_PROJECTION );
	glLoadIdentity();
	gluPerspective ( 60.0 , static_cast<double> ( newWidth ) / newHeight , 0.001 , 100.0 );
	glMatrixMode ( GL_MODELVIEW );
	glutPostRedisplay();
}

void timer ( int ) {
	thetha += 0.5;
	glutPostRedisplay();
	glutTimerFunc ( delay , timer , 0 );
}