#include <stdlib.h>
#include <GL/glut.h>
#include <iostream>
#include <clocale>

using namespace std;

//Инициализация
void init1(void)
{
   glClearColor(0.0,0.0,0.0,0.0);
   glShadeModel(GL_FLAT);
}

//Отображение
void display1(void)
{
   glClear(GL_COLOR_BUFFER_BIT);
   glColor3f(1.0,1.0,1.0);

   //Очистить матрицу
   glLoadIdentity();

   //Видовая трансформация(камера)
   gluLookAt(0.0,0.0,5.0,0.0,0.0,0.0,0.0,1.0,0.0);

   //Модельная трансформация
   glScalef(1.0,2.0,1.0);
   glutWireCube(1.0);
   glFlush();
}

//Изменение размеров окна
void reshape1(int w, int h)
{
   glViewport(0,0,(GLsizei) w, (GLsizei) h);
   glMatrixMode(GL_PROJECTION);
   glLoadIdentity();
   glFrustum(-1.0,1.0,-1.0,1.0,1.5,20.0);
   glMatrixMode(GL_MODELVIEW);
}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//Инициализация
void init2(void)
{
   glClearColor(0.0,0.0,0.0,0.0);
   glShadeModel(GL_FLAT);
}

//Изменение размеров окна
void reshape2(int w, int h)
{
   glViewport(0,0,(GLsizei) w, (GLsizei) h); 
   glMatrixMode(GL_PROJECTION);
   glLoadIdentity();
   gluPerspective(60.0,(GLfloat) w/(GLfloat) h,1.0,20.0); glMatrixMode(GL_MODELVIEW);
}

//Отображение 
void display2(void)
{
   GLdouble eqn[4]={0.0,1.0,0.0,0.0};
   GLdouble eqn2[4]={1.0,0.0,0.0,0.0};

   glClear(GL_COLOR_BUFFER_BIT);
   glColor3f(1.0,1.0,1.0);
   glPushMatrix();
   glTranslatef(0.0,0.0,-5.0);

   //Отсечь нижнюю половину (y<0) 
   glClipPlane(GL_CLIP_PLANE0,eqn);
   glEnable(GL_CLIP_PLANE0);

   //Отсечь левую половину (x<0) 
   glClipPlane(GL_CLIP_PLANE1,eqn2);
   glEnable(GL_CLIP_PLANE1);
   glRotatef(90.0,1.0,0.0,0.0);
   glutWireSphere(2.0,20,16);
   glPopMatrix();
   glFlush();
}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

int year=0, day=0;

//Инициализация
void init3(void)
{
   glClearColor(0.0,0.0,0.0,0.0);
   glShadeModel(GL_FLAT);
}

//Изменение размеров окна
void reshape3(int w, int h)
{
   glViewport(0,0,(GLsizei) w, (GLsizei) h);
   glMatrixMode(GL_PROJECTION);
   glLoadIdentity();
   gluPerspective(60.0,(GLfloat) w/ (GLfloat) h,1.0,20.0);
   glMatrixMode(GL_MODELVIEW);
   glLoadIdentity();
   gluLookAt(0.0,0.0,5.0,0.0,0.0,0.0,0.0,1.0,0.0);
}

//Отображение 
void display3(void)
{
   glClear(GL_COLOR_BUFFER_BIT);
   glColor3f(1.0,1.0,1.0);
   glPushMatrix();

   //Рисуем солнце 
   glutWireSphere(1.0,20,16);
   glRotatef((GLfloat)year,0.0,1.0,0.0);
   glTranslatef(2.0,0.0,0.0);
   glRotatef((GLfloat)day,0.0,1.0,0.0);

   //Рисуем планету 
   glutWireSphere(0.2,10,8);
   glPopMatrix();
   glutSwapBuffers();
}

//Реакция на клавиатуру 
void keyboard(unsigned char key,int x, int y)
{
   switch(key)
   {
      case 'd':
         day=(day+10)%360;
         glutPostRedisplay();
         break;
      case 'D':
         day=(day-10)%360;
         glutPostRedisplay();
         break;
      case 'y':
         year=(year+5)%360;
         glutPostRedisplay();
         break;
      case 'Y':
         year=(year-5)%360;
         glutPostRedisplay();
         break;
      default:
         break;
   }
}
int main(int argc, char **argv)
{
	setlocale(LC_CTYPE, "rus");
	int number;
	cout <<"1 - Куб" <<endl;
	cout <<"2 - Усечонная проволочная сфера" <<endl;
	cout <<"3 - Планетарная система" <<endl;
	cin >>number;
	if (number == 1) {
		glutInit(&argc,argv);
		glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);
		glutInitWindowSize(500,500);
		glutInitWindowPosition(100,100);
		glutCreateWindow("Transformed Cube");
		init1();
		glutDisplayFunc(display1);
		glutReshapeFunc(reshape1);
		glutMainLoop();
	} else if (number == 2) {
		glutInit(&argc,argv);
		glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB); 
		glutInitWindowSize(500,500);
		glutInitWindowPosition(100,100);
		glutCreateWindow("Wireframe Sphere with Two Clipping Planes"); 
		init2();
		glutDisplayFunc(display2);
		glutReshapeFunc(reshape2);
		glutMainLoop();
	} else if (number == 3) {
		glutInit(&argc,argv);
		glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGB);
		glutInitWindowSize(500,500);
		glutInitWindowPosition(100,100);
		glutCreateWindow("Planetary System");
		init3();
		glutDisplayFunc(display3);
		glutReshapeFunc(reshape3);
		glutKeyboardFunc(keyboard);
		glutMainLoop();
	} else {
		return 0;
	}

	return 0;
}