solar system

// OpenGLApplication.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include "glut.h"
#include <gl/gl.h>

int screen_width=640;
int screen_height=480;
float z = 280.0, d = 10.0;
int r = 1;
int count = 0;
void initOpenGL()
{
	glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
	glShadeModel(GL_SMOOTH);
	glViewport(0, 0, screen_width, screen_height);
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	gluPerspective(45.0f, (GLfloat)screen_width/(GLfloat)screen_height, 1.0f, 1000.0f);
	glEnable(GL_DEPTH_TEST);
	glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
	glMatrixMode(GL_MODELVIEW);
}

void renderScene(void)
{
	count++;
	if(count % 30 == 0)
		r++;

	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	glLoadIdentity();
	gluLookAt(0.0, 0.0, z, 0.0, 0.0, -10.0, 0.0, 1.0, 0.0);
	glColor4f(1,0.8,0.2,0.9);

	glPushMatrix();
	glRotatef(r/5,0,1,0);
	glutSolidSphere(30,16,16);
	glPopMatrix();


	glRotatef(r,0,1,0);


	glTranslatef(70,0,0);
	glColor4f(0,0.3,1,0.9);
glPushMatrix();
	glRotatef(r,0,1,0);
	glutSolidSphere(15,16,16);
glPopMatrix();

	glPushMatrix();

	glRotatef(r,0,1,0);
	glRotatef(r*5,0,1,0);
	glTranslatef(20,0,0);
	glColor4f(0.3,0,0.3,0.9);
	glutSolidSphere(8,16,16);

	glPopMatrix();

	glutSwapBuffers();
}

void changeSize(int w, int h)
{
	screen_width=w;
	screen_height=h;

	if(h == 0)
		h = 1;

	float ratio = 1.0*w/h;

	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	glViewport(0, 0, w, h);
	gluPerspective(45.0f, ratio, 1.0f, 1000.0f);
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
	gluLookAt(0.0f, 0.0f, 50.0f, 0.0f, 0.0f, -1.0f, 0.0f, 1.0f, 0.0f);
}

void processNormalKeys(unsigned char key, int x, int y)
{

	switch(key)
	{
		case 't':
			//process
			glutPostRedisplay();
			break;
		case 's':
			z=z*2;
			break;
		case 'w':
			z = (int)z/2;
			break;
		case 'r':
			r++;
			break;
		case 'y':
			r--;
			break;
		case 'd':
			d=d++;
			break;
		case 'a':
			d=(int)d--;
			break;

	}


}

int main(int argc, char* argv[])
{
	//Initialize the GLUT library
	glutInit(&argc, argv);
	//Set the display mode
	glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE | GLUT_RGBA);
	//Set the initial position and dimensions of the window
	glutInitWindowPosition(100, 100);
	glutInitWindowSize(screen_width, screen_height);
	//creates the window
	glutCreateWindow("First OpenGL Application");
	//Specifies the function to call when the window needs to be redisplayed
	glutDisplayFunc(renderScene);
	//Sets the idle callback function
	glutIdleFunc(renderScene);
	//Sets the reshape callback function
	glutReshapeFunc(changeSize);
	//Keyboard callback function
	glutKeyboardFunc(processNormalKeys);
	//Initialize some OpenGL parameters
	initOpenGL();
	//Starts the GLUT infinite loop
	glutMainLoop();
	return 0;
}