/// Computer Graphics - Amir Hesami
#pragma comment(lib, "opengl32.lib")  // Link OpenGL32.lib
#pragma comment(lib, "glu32.lib")    // Link Glu32.lib
#pragma comment(lib, "glut32.lib")    // Link Glut32.lib#include<GL/glut.h>
#include <GL/glut.h>
#include <GL/glu.h>
#include <GL/gl.h>
#include <stdlib.h> 	
#include<stdio.h> 
const int screenWidth=640;
const int screenHeight=480;
void display();
void init();
void mykey(unsigned char ,int ,int );
void setPerVolume(double,double,double,double);
void setViewport(int,int,int,int);
void menu(int );
float red=0.0f,green=0.0f,blue=1.0f;
int main(int argc,char** argv)
{
	glutInit(&argc,argv);
	glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
	glutInitWindowSize(screenWidth,screenHeight);
	glutInitWindowPosition(50,50);
	glutCreateWindow("Teapot /Computer Graphics - Amir Hesami ");
	glutCreateMenu(menu);
	glutAddMenuEntry("Red",1);
	glutAddMenuEntry("Green",2);
	glutAddMenuEntry("Blue",3);
	glutAddMenuEntry("Exit",4);
	glutAttachMenu(GLUT_RIGHT_BUTTON);
	init();
	glutSetCursor(GLUT_CURSOR_CROSSHAIR);
	glutDisplayFunc(display);
	glutKeyboardFunc(mykey);
	glutMainLoop();
	return 0;
}
void init()
{
	setPerVolume(30,1.5,0.3,50);
	setViewport(0,screenWidth,0,screenHeight);
}
void setPerVolume(double viewAngle,double aspectRatio,double N,double F)
{
	GLdouble eyeX=3;
	GLdouble eyeY=3;
	GLdouble eyeZ=3;
	GLdouble lookX=0;
	GLdouble lookY=0.25;
	GLdouble lookZ=0;
	GLdouble upX=0;
	GLdouble upY=1;
	GLdouble upZ=0;
	glClear (GL_COLOR_BUFFER_BIT);
	glClearColor(1.0,1.0,1.0,1.0);
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	gluPerspective(viewAngle,aspectRatio,N,F);
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
	gluLookAt(eyeX,eyeY,eyeZ,lookX,lookY,lookZ,upX,upY,upZ);
}
void setViewport(int left,int right,int bottom,int top)
{
	glViewport(left,bottom,right-left,top-bottom);
}
void display()
{
	glColor3f(red,green,blue);
	init();
	glutWireTeapot(1);
	glFlush();
}

void mykey(unsigned char key,int x,int y)
{
	if(key=='Q' ||key=='q')
		exit(0);
	
}
void menu(int value)
{
	if(value==1)
	{
		red=1.0f;
		green=0.0f;
		blue=0.0f;
		display();
	}
	if(value==2)
	{
		red=0.0f;
		green=1.0f;
		blue=0.0f;
		display();
	}
	if(value==3)
	{
		red=0.0f;
		green=0.0f;
		blue=1.0f;
		display();
	}
	if(value==4)
	{
		exit(0);
	}
	

}