#include "..\glut.h"
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <iostream.h>
#include "button.cpp"

#define PI (3.1415926)

/* global variable declarations */

GLint window1, window2;
GLfloat theta = 0.0;
GLfloat thetaIncrement;
bool green = false;
bool spinning = true;

/* function declarations ----------------------------------*/

void myInit(){

    glutSetWindow(window1);
    glClearColor(0.0, 0.0, 0.0, 1.0);
    glColor3f(1.0, 1.0, 1.0);

    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluOrtho2D(-2.0, 2.0, -2.0, 2.0);

    glutSetWindow(window2);
    glClearColor(0.0, 0.0, 0.0, 1.0);
    glColor3f(1.0, 1.0, 1.0);

    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluOrtho2D(-2.0, 2.0, -2.0, 2.0);

} // end of myInit()

/* --------------------------------------------------------*/

void myDisplay1()
{
    glClear(GL_COLOR_BUFFER_BIT);

	glColor3f(1.0, 0.0, 0.0);
    glBegin(GL_POLYGON);
        glVertex2f(cos(PI*theta/180.0), sin(PI*theta/180));
        glVertex2f(-sin(PI*theta/180.0), cos(PI*theta/180));
        glVertex2f(-cos(PI*theta/180.0), -sin(PI*theta/180));
        glVertex2f(sin(PI*theta/180.0), -cos(PI*theta/180));
    glEnd();

	glFlush();
} // end of myDisplay1()

void myDisplay2()
{
    glClear(GL_COLOR_BUFFER_BIT);

	if (green)
		glColor3f(0.0, 1.0, 0.0);
	else
	    glColor3f(0.0, 0.0, 1.0);
    glBegin(GL_POLYGON);
        glVertex2f(cos(PI*theta/180.0), sin(PI*theta/180));
        glVertex2f(-sin(PI*theta/180.0), cos(PI*theta/180));
        glVertex2f(-cos(PI*theta/180.0), -sin(PI*theta/180));
        glVertex2f(sin(PI*theta/180.0), -cos(PI*theta/180));
    glEnd();

	glutSwapBuffers();
} // end of myDisplay2()

/* --------------------------------------------------------*/

void spinDisplay() {
	theta += thetaIncrement;
	if (theta >= 360.0) theta -= 360.0;

	glutSetWindow(window1);
	glutPostRedisplay();

	glutSetWindow(window2);
	glutPostRedisplay();
}

/* --------------------------------------------------------*/

void myKeyboard(unsigned char key, int x, int y) {
	if (key == 'Q' || key == 'q')
		exit(0);
}

/* --------------------------------------------------------*/

void myMouse(int button, int state, int x, int y) {
	if (button == GLUT_LEFT_BUTTON && state == GLUT_DOWN && spinning)
		glutIdleFunc(NULL);

	if (button == GLUT_LEFT_BUTTON && state == GLUT_DOWN && !spinning)
		glutIdleFunc(spinDisplay);

	if (state == GLUT_DOWN) spinning = !spinning;
}	

/* --------------------------------------------------------*/

void quit_menu(int id) {
	if (id == 1)
		green = true;
	if (id == 2)
		exit(0);
}

/* --------------------------------------------------------*/

int main(int argc, char **argv)
{
    cout << "Enter a thetaIncrement value (0.02 is good!): ";
	cin >> thetaIncrement;
	cout << endl;
    
	glutInit(&argc, argv);

    /* set up first window */

    glutInitDisplayMode( GLUT_SINGLE | GLUT_RGB );
    glutInitWindowSize(300, 300);
    glutInitWindowPosition(30, 30);
    window1 = glutCreateWindow("Single Buffered Window");

    /* register callback functions */
    glutDisplayFunc( myDisplay1 );
    glutKeyboardFunc( myKeyboard );
	glutIdleFunc( spinDisplay );
	glutMouseFunc( myMouse );

    /* set up second window */

    glutInitDisplayMode( GLUT_DOUBLE | GLUT_RGB );
    glutInitWindowSize(300, 300);
    glutInitWindowPosition(350, 30);
    window2 = glutCreateWindow("Double Buffered Window");

    /* register callback functions */
    glutDisplayFunc( myDisplay2 );
	glutKeyboardFunc( myKeyboard );
	glutIdleFunc( spinDisplay );
	glutMouseFunc( myMouse );

	/* add a menu! */
	glutCreateMenu(quit_menu);
	glutAddMenuEntry("change colors", 1);
	glutAddMenuEntry("quit", 2);
	glutAttachMenu(GLUT_RIGHT_BUTTON);

    /* start the event loop */
    myInit();
    glutMainLoop();

    return 0;
} // end of main