#include <iostream.h>
#include <GL/glut.h>
#include "triangle.h"

int m_w; //MainWindow
float angle=1.0;

/* LIGHT ATTRIBUTES */
GLfloat light0pos[] = {1.0,1.0,1.0,1.0};
GLfloat	light0dir[] = {0.0,0.0,0.0,0.0};
GLfloat light0amb[] = {1.0,0.0,0.0,1.0};
GLfloat light0spec[] = {0.0,0.0,0.0,1.0};

GLfloat ptX[3]={-0.5,0.5,0.0};
GLfloat ptY[3]={-0.5,-0.5,0.5};
GLfloat ptZ[3]={0.0,0.0,0.0};


triangle t(ptX, ptY, ptZ);//Dichiarazione di un oggetto
bool RIGHT_BTN_DOWN = false;


void mouse(int btn, int state, int x, int y){
	if(btn == GLUT_LEFT_BUTTON && state == GLUT_DOWN){
		RIGHT_BTN_DOWN = false;
		t.last_x = x;
		t.last_y = y;
	}
	else if (btn == GLUT_RIGHT_BUTTON && state == GLUT_DOWN){
		RIGHT_BTN_DOWN = true;
		t.last_scale = y;
	}
}


void mouse_motion(int x, int y){
	
	if(RIGHT_BTN_DOWN){
		if ((y-t.last_scale) > 0)
			t.scale += (float)0.05;
		else
			t.scale -= (float)0.05;
		
		t.last_scale = y;
		
	}
	else{
		t.rotationX += (float) (y - t.last_y);
		t.rotationY += (float) (x - t.last_x);
	
		t.last_x = x;
		t.last_y = y;
		
	}
	glutPostRedisplay();
}

void  m_wDisplay(void){
	glClearColor( .0f, .0f, .5f, 1.0f ); //Colore di sfondo
	glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
	
	t.Draw();
	
	glutSwapBuffers(); 
}

/*CODICE STANDARD PER IL RESHAPE*/
void m_wReshape(int w, int h){
	
	glViewport(0,0,w,h);
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	if(w<=h)
		glOrtho(-1.0,1.0, -1.0*(GLfloat)h/(GLfloat)w, 1.0*(GLfloat)h/(GLfloat)w,-1.0,1.0);
	else
		glOrtho(-1.0*(GLfloat)w/(GLfloat)h, 1.0*(GLfloat)w/(GLfloat)h,-1.0,1.0,-1.0,1.0);
	
	glMatrixMode(GL_MODELVIEW);
	//	glLoadIdentity(); // Se ci sono mi ridisegnano il triangolo Originale.
}

void Init_GLUT_ENV(void){
	/*GLUT INITIALIZATION*/	
	glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
	glutInitWindowPosition( 50, 50 );
	glutInitWindowSize( 300, 300 );
	

		/* main_wind Display Registration & GLUT registration */


	m_w = glutCreateWindow( "Triangolo" );
	glutDisplayFunc(m_wDisplay);
	glutReshapeFunc(m_wReshape);
	glutMotionFunc( mouse_motion );
	glutMouseFunc(mouse);
}

void InitGL(void){
	glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	glClearColor( .0f, .0f, .5f, 1.0f ); //Colore di sfondo
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	glOrtho(-1.0,1.0,-1.0,1.0,-1.0,1.0);
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
	glShadeModel(GL_SMOOTH);
	
	
	/* LUCI */
	glEnable(GL_LIGHTING);
	glEnable(GL_LIGHT0);
	glLightfv(GL_LIGHT0, GL_POSITION, light0pos);
	glLightfv(GL_LIGHT0, GL_AMBIENT, light0amb);
	glLightfv(GL_LIGHT0, GL_SPECULAR, light0spec);
	
	glEnable(GL_DEPTH_TEST);
	
	glLightModeli(GL_LIGHT_MODEL_TWO_SIDE, GL_TRUE);
}

void main(int argc, char *argv[]){
	glutInit(&argc, argv);
	Init_GLUT_ENV();
	InitGL();
	glutMainLoop();
	exit(0);
}