game.cpp

//============================================================================
//	Hassan Shahzad
//	18i-0441
//	FAST-NUCES
//	Computer Graphics: 3D Solar System Scene
//	Contact at : chhxnshah@gmail.com
//============================================================================

#include <GL/gl.h>
#include <GL/glut.h>
#include <iostream>
#include<string>
using namespace std;

float xRotated = 90.0, yRotated = 0.0, zRotated = 0.0;

//________________________________________________________________________________________________________________________________

//defining some MACROS

#define FPS 1000 // frame per seconds

// define another constant to hold ASCII for Escape key.
#define KEY_ESC 27

//________________________________________________________________________________________________________________________________
void reshapeFunc(int x, int y)
{
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	gluPerspective(40.0, (GLdouble)x / (GLdouble)y, 0.5,20.0);
	glMatrixMode(GL_MODELVIEW);
	glViewport(0,0,x,y);
}
//________________________________________________________________________________________________________________________________


void Draw_Spheres()
{
	glClearColor(0/*Red Component*/, 0.0/*Green Component*/,
				0.0/*Blue Component*/, 0 /*Alpha component*/); // Red==Green==Blue==1 --> White Colour
	glClear(GL_COLOR_BUFFER_BIT); //Update the colors
	glMatrixMode (GL_MODELVIEW);
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	glLoadIdentity();
	glTranslatef(0.0,0.0,-15.0);

// SUN
	glColor4f(1.0,1.0,0.0,0.0);	//Yellow color 
	glPushMatrix();
	glTranslatef(-12.5,0.0,0.0);
	glutSolidSphere(4.0,50,50);
	glPopMatrix();

// Mercury
	glColor3f(0.0,0.1,0.1);	//Dark Grey color 
	glPushMatrix();
	glTranslatef(-7,0.0,0.0);
	glRotatef(60.0,1,0,0);
	glRotatef(zRotated*1.5,0,0,1);
	glutSolidSphere(0.4,15,10);
	glPopMatrix();

// Venus
	glColor4f(1.0,0.5,0.0,0.0);	//Orange Brown color 
	glPushMatrix();
	glTranslatef(-5.5,0.0,0.0);
	glRotatef(60.0,1,0,0);
	glRotatef(zRotated,0,0,1);	
	glutSolidSphere(0.7,20,20);
	glPopMatrix();

//Earth
	glColor3f(0.1,0.2,0.8);	//Blue color 
	glPushMatrix();
	glTranslatef(-3.8,0.0,0.0);
	glRotatef(60.0,1,0,0);
	glRotatef(zRotated*3,0,0,1);
	glutSolidSphere(0.7,20,20);
	glPopMatrix();
	
//Mars
	glColor3f(0.8,0.2,0.1);	//Red color 
	glPushMatrix();
	glTranslatef(-2.3,0.0,0.0);
	glRotatef(125.0,1,0,0);
	glRotatef(zRotated*4.0,0,0,1);		
	glutSolidSphere(0.5,20,15);
	glPopMatrix();

//Jupiter
	glColor3f(1.0,0.5,0.0);	//Orange color 
	glPushMatrix();
	glTranslatef(-0.5,0.0,0.0);
	glRotatef(125.0,1,0,0);
	glRotatef(zRotated*7.0,0,0,1);		
	glutSolidSphere(1.0,20,40);
	glPopMatrix();


// Saturn
	glColor3f(0.0,0.5,0.5);	//Bluish Green 
	glPushMatrix();
	glTranslatef(2.0,0.0,0.0);
	glRotatef(60.0,1,0,0);
	glRotatef(zRotated*6.5,0,0,1);		
	glutSolidSphere(1.0,20,30);
	glPopMatrix();

//Uranus
	glColor3f(0.5,1.0,1.0);	//Cyan Color, 
	glPushMatrix();
	glTranslatef(4.0,0.0,0.0);
	glRotatef(125.0,1,0,0);
	glRotatef(zRotated*5.0,0,0,1);		
	glutSolidSphere(0.7,20,20);
	glPopMatrix();


//Neptune
	glColor3f(0.1,0.0,1.0);	//Purple Color, 
	glPushMatrix();
	glTranslatef(6.0,0.0,0.0);
	glRotatef(60.0,1,0,0);
	glRotatef(zRotated*5.5,0,0,1);		
	glutSolidSphere(0.7,20,20);
	glPopMatrix();

	glutSwapBuffers();
}
//________________________________________________________________________________________________________________________________

void idleFunc()
{
	zRotated+=0.1;
	glutPostRedisplay();
}

//________________________________________________________________________________________________________________________________

void SetCanvasSize(int width, int height) {
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	glOrtho(0, width, 0, height, -1, 1); // set the screen size to given width and height.
}
//________________________________________________________________________________________________________________________________

void PrintableKeys(unsigned char key, int x, int y) {
	if (key == KEY_ESC/* Escape key ASCII*/) {
		exit(1); // exit the program when escape key is pressed.
	}
}


//________________________________________________________________________________________________________________________________

int main(int argc, char*argv[]) {
	int width = 1300, height = 800; // i have set my window size to be 800 x 600
	glutInit(&argc, argv); // initialize the graphics library...
	glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA); // we will be using color display mode
	glutInitWindowPosition(50, 50); // set the initial position of our window
	glutInitWindowSize(width, height); // set the size of our window
	glutCreateWindow("Computer Graphics: 3D Solar System Scene"); // set the title of our game window
	glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
	SetCanvasSize(width, height); // set the number of pixels...
	glutDisplayFunc(Draw_Spheres); // tell library which function to call for drawing Canvas.
	glutReshapeFunc(reshapeFunc);
	glutIdleFunc(idleFunc);
	glutKeyboardFunc(PrintableKeys); // tell library which function to call for printable ASCII characters
	glutMainLoop();
	return 1;
}