/*
-----------------------------------------------------------------------------
OpenGL Tutorial
VOXAR Labs
Computer Science Center - CIn
Federal University of Pernambuco - UFPE
http://www.cin.ufpe.br/~voxarlabs

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

#include "openGL_tutorial.h"

/////////////////////////////////////////////////////////////////////////////
/*
http://www.inf.pucrs.br/~manssour/OpenGL/Tutorial.html
esse link!!!!
nãoo vou parar aquui pra mostrar mais coisas de C/C++ hj..
*/
/////////////////////////////////////////////////////////////////////////////


#include <iostream>
#include <vector>

const int WINDOW_W = 500;
const int WINDOW_H = 500;

using namespace std;

class Ponto
{
public:
	float x, y;
	Ponto(float x, float y) : x(x), y(y) {};

};

vector <Ponto> pontos;

void display()
{
	glClear(GL_COLOR_BUFFER_BIT);
	glLoadIdentity();

	if (pontos.size() > 0)
	{
		glPointSize(5.0f);
		glBegin(GL_POINTS);
		glColor3f(1.0f, 1.0f, 0.0f);
		for (int i = 0; i < pontos.size(); i++)
			glVertex2d(pontos.at(i).x, pontos.at(i).y);

		glEnd();

		glBegin(GL_LINE_STRIP);
		glColor3f(1.0f, 1.0f, 1.0f);
		for (int i = 0; i < pontos.size(); i++)
			glVertex2d(pontos.at(i).x, pontos.at(i).y);
		glEnd();
	}

	glFlush();
}

void reshape(int w, int h)
{
	glViewport(0, 0, (GLsizei)w, (GLsizei)h);

	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	glOrtho(0.0f, WINDOW_W, WINDOW_H, 0.0f, -5.0, 5.0);
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
}

void handleKeypress(unsigned char key, int x, int y)
{
	static int x1 = 0;
	switch (key){
	case 27: // ESC
		exit(0);
		break;
	case 119:
		glLineWidth(5.0f);
		pontos.push_back(Ponto(x, y));
		glutPostRedisplay();
		x1++;
		break;
	}

}

void handleMouseClick(int button, int state, int x, int y)
{
	if (button == GLUT_LEFT_BUTTON)
	if (state == GLUT_DOWN)
		pontos.push_back(Ponto(x, y));

	glutPostRedisplay();  // avisa que a janela atual deve ser reimpressa
}

int main(int argc, char ** argv)
{
	glutInit(&argc, argv);
	glutInitWindowPosition(0, 0); // a janela irá iniciar to topo esquerdo
	glutInitWindowSize(WINDOW_W, WINDOW_H);
	glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE);

	glutCreateWindow("Exemplo OpenGL");
	glMatrixMode(GL_MODELVIEW); // estou alterando a matrix de do modelo da cena
	glLoadIdentity();

	glutDisplayFunc(display);
	glutKeyboardFunc(handleKeypress);
	glutMouseFunc(handleMouseClick);
	glutReshapeFunc(reshape);

	glutMainLoop();

	return 0;
}