#include <windows.h>
#include <iostream>
#include <stdlib.h>

#ifdef __APPLE__
#include <OpenGL/OpenGL.h>
#include <GLUT/glut.h>
#else
#include <GL/glut.h>
#endif

using namespace std;

//Called when a key is pressed
void handleKeypress(unsigned char key, int x, int y) {
	switch (key) {
		case 27: //Escape key
			exit(0);
	}
}

//Initializes 3D rendering
void initRendering() {
	glEnable(GL_DEPTH_TEST);
	glEnable(GL_COLOR_MATERIAL); //Enable color
	glClearColor(0.7f, 0.9f, 1.0f, 1.0f); //Change the background to sky blue
}

//Called when the window is resized
void handleResize(int w, int h) {
	glViewport(0, 0, w, h);
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	gluPerspective(45.0, (double)w / (double)h, 1.0, 200.0);
}

float _angle = 30.0f;
float _cameraAngle = 0.0f;

//Draws the 3D scene
void drawScene() {
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
	glRotatef(-_cameraAngle, 0.0f, 1.0f, 0.0f);
	glTranslatef(0.0f, 0.0f, -5.0f);

	glPushMatrix();
	glTranslatef(0.0f, -1.0f, 0.0f);
	glRotatef(_angle, 0.0f, 0.0f, 1.0f);

	glBegin(GL_QUADS);

	//Trapezoid
	glColor3f(1.0f, 0.0f, 0.0f);
	glVertex3f(-0.7f, -0.5f, 0.0f);
	glVertex3f(0.7f, -0.5f, 0.0f);
	glVertex3f(0.7f, 0.5f, 0.0f);
	glVertex3f(-0.7f, 0.5f, 0.0f);

	glEnd();

	glPopMatrix();

	glPushMatrix();
	glTranslatef(1.0f, 1.0f, 0.0f);
	glRotatef(_angle, 0.0f, 1.0f, 0.0f);
	glScalef(0.7f, 0.7f, 0.7f);

	glBegin(GL_TRIANGLES);
	glColor3f(0.0f, 1.0f, 0.0f);

	//Pentagon
	glVertex3f(-0.5f, -0.5f, 0.0f);
	glVertex3f(0.5f, -0.5f, 0.0f);
	glVertex3f(-0.5f, 0.0f, 0.0f);

	glVertex3f(-0.5f, 0.0f, 0.0f);
	glVertex3f(0.5f, -0.5f, 0.0f);
	glVertex3f(0.5f, 0.0f, 0.0f);

	glVertex3f(-0.5f, 0.0f, 0.0f);
	glVertex3f(0.5f, 0.0f, 0.0f);
	glVertex3f(0.0f, 0.5f, 0.0f);


	glEnd();

	glPopMatrix();

	glPushMatrix();
	glTranslatef(-1.0f, 1.0f, 0.0f);
	glRotatef(_angle, 1.0f, 0.0f, 0.0f);
	glScalef(1.5,1.5,1.5);

	glBegin(GL_TRIANGLES);

	//Triangle
	glColor3f(0.0f, 0.0f, 1.0f);
	glVertex3f(0.5f, -0.5f, 0.0f);
	glVertex3f(0.0f, 0.5f, 0.0f);
	glVertex3f(-0.5f, -0.5f, 0.0f);

	glEnd();

	glPopMatrix();



	glutSwapBuffers();
}

void update(int value) {
	_angle += 2.0f;
	if (_angle > 360) {
		_angle -= 360;
	}

	glutPostRedisplay(); ////Tell GLUT that the scene has changed
	glutTimerFunc(25, update, 0);
}

int main(int argc, char** argv) {
	//Initialize GLUT
	glutInit(&argc, argv);
	glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
	glutInitWindowSize(400, 400);

	//Create the window
	glutCreateWindow("Color");
	initRendering();

	//Set handler functions
	glutDisplayFunc(drawScene);
	glutKeyboardFunc(handleKeypress);
	glutReshapeFunc(handleResize);

	glutTimerFunc(25, update, 0); //Add a timer

	glutMainLoop();
	return 0;
}