#include "GLwindow.h"

#include <GL/glu.h>
#include <iostream>

#include <QKeyEvent>
#include <QTimer>
#include <QDebug>

GLwindow::GLwindow(QWidget *parent)
: QGLWidget(parent)
{
    _width = 0;
    _height = 0;
    distance = -5.0;
    x=0;x_rot = 0.;
    y=0;y_rot = 0.;
    z=0; z_rot = .0;
       // QWidget::setMouseTracking(true);
}

GLwindow::~GLwindow()
{
   // glDeleteTextures(1, &_blur_texture);
}

void GLwindow::_tick()
{
    /* redisplay */
    update(); // triggers paintGL()
    QTimer::singleShot(33, this, SLOT(_tick()));
}

void GLwindow::initializeGL()
{
    distance = -10.0;
    x_rot = 0.;
    y_rot = 0.;
    z_rot = 0.;
    qglClearColor(Qt::darkGray);
    glEnable(GL_DEPTH_TEST);

    _tick();
}



void GLwindow::paintGL()
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
        glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);


        // Model view matrix
    //    glMatrixMode(GL_MODELVIEW);
        glLoadIdentity();

        glTranslatef(0.0, 0.0, distance);
        glRotatef(x_rot / 16.0f, 1.0f, 0.0f, 0.0f);
        glRotatef(y_rot / 16.0f, 0.0f, 1.0f, 0.0f);
        glRotatef(z_rot / 16.0f, 0.0f, 0.0f, 1.0f);

        // Projection matrix
  /*      glMatrixMode(GL_PROJECTION);
        glLoadIdentity();
        gluPerspective(60.0f, 1.0*width()/height(), 0.1f, 100.0f);
*/    //_view_ortho();
    _draw();
    //_view_perspective();
}


void GLwindow::resizeGL( int width, int height)
{
    int side = qMin(width, height);
    glViewport((width - side) / 2, (height - side) / 2, side, side);

    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
#ifdef QT_OPENGL_ES_1
    glOrthof(-2, +2, -2, +2, 1.0, 15.0);
#else
    glOrtho(-2, +2, -2, +2, 1.0, 15.0);
#endif
    glMatrixMode(GL_MODELVIEW);
}
/*************************
 *
 *      Clavier
 *
 * *********************/
void GLwindow::keyPressEvent(QKeyEvent *event)
{
    if(event->key() == Qt::Key_Space){
        distance = -10.0;
        x_rot = 0.;
        y_rot = 0.;
        z_rot = 0.;
    }
        updateGL();// on modifie l'affichage
}


/*************************
 *
 *      Sourie
 *
 * *********************/


void GLwindow::wheelEvent(QWheelEvent *event)
{
    distance *= 1.0 + (1.0 * event->delta() / 1200.0);
    updateGL();
}
void GLwindow::mousePressEvent(QMouseEvent *event)
{
    last_pos = event->pos();
  //  qDebug() <<last_pos;
}
void GLwindow::mouseMoveEvent(QMouseEvent *event)
{
    int dx = event->x() - last_pos.x();
    int dy = event->y() - last_pos.y();
    if (event->buttons() & Qt::LeftButton) {
        setXRotation(x_rot + 8 * dy);
        setYRotation(y_rot + 8 * dx);
    } else if (event->buttons() & Qt::RightButton) {
        setXRotation(x_rot + 8 * dy);
        setZRotation(z_rot + 8 * dx);
    } else if (event->buttons() & Qt::MiddleButton) {
        distance = -10.0;
        x_rot = 0.;
        y_rot = 0.;
        z_rot = 0.;
    }

    last_pos = event->pos();
    // qDebug()<<last_pos;
}
static void qNormalizeAngle(int &angle)
{
    while (angle < 0)
        angle += 360 * 16;
    while (angle > 360)
        angle -= 360 * 16;
}

void GLwindow::setXRotation(int angle)
{
    qNormalizeAngle(angle);
    if (angle != x_rot) {
        x_rot = angle;
        //emit xRotationChanged(angle);
        updateGL();
    }
}

void GLwindow::setYRotation(int angle)
{
    qNormalizeAngle(angle);
    if (angle != y_rot) {
        y_rot = angle;
        //emit yRotationChanged(angle);
        updateGL();
    }
}

void GLwindow::setZRotation(int angle)
{
    qNormalizeAngle(angle);
    if (angle != z_rot) {
        z_rot = angle;
        //emit zRotationChanged(angle);
        updateGL();
    }
}
/*********************
 * *
 * *    Model view
 * *
 * *********************/
void GLwindow::_view_ortho()                                    // Set Up An Ortho View
{
    glMatrixMode(GL_PROJECTION);								// Select Projection
    glPushMatrix();												// Push The Matrix
    glLoadIdentity();											// Reset The Matrix
    glOrtho( 0, _width , _height, 0, -1, 1 );                   // Select Ortho Mode (640x480)
    glMatrixMode(GL_MODELVIEW);									// Select Modelview Matrix
    glPushMatrix();												// Push The Matrix
    glLoadIdentity();											// Reset The Matrix
}

void GLwindow::_view_perspective()                              // Set Up A Perspective View
{
    glMatrixMode( GL_PROJECTION );								// Select Projection
    glPopMatrix();												// Pop The Matrix
    glMatrixMode( GL_MODELVIEW );								// Select Modelview
    glPopMatrix();												// Pop The Matrix
}
/*************************
 * *
 * *    outil de dessin
 * *
 * *
 * ***********************/
// Repere orthonorme
static void repereScene3D(float l)
{

   glBegin (GL_LINES);
      glColor3d(1.,0.,0.) ; // red axe
     glVertex3f (0., 0., 0.);
     glVertex3f (l, 0., 0.);

        glColor3d(0.,1.,0.) ;// green axe
     glVertex3f (0., 0., 0.);
     glVertex3f (0., l, 0.);

        glColor3d(0.,0.,1.) ;//bleu axe
     glVertex3f (0., 0., 0.);
     glVertex3f (0., 0., l);
   glEnd ();

}
void GLwindow::_draw(){


  qglColor(Qt::white);
  renderText(200, 200, QString("Scene RGB"));
    repereScene3D(200.0);
    if(_image)
        _draw_rgb();
}

/***********************************************************************************
 **         Project drawer
 **
 **
 **
 ** *****************************************************************************/
void GLwindow::_setImg(QImage* Img){
    _image = Img;
    updateGL();

}
void GLwindow::_draw_Point(QRgb pixel){
      // glColor4f(1.0f,1.0f,1.0f, 0.8);					// Set The Alpha Value (Starts At 0.2)
    qglColor(pixel);
    glVertex3d(qRed(pixel)* 200 /255., qGreen(pixel) * 200 /255., qBlue(pixel) * 200 /255.);

}
void GLwindow::_draw_rgb(){
    glPointSize(3.);
    glBegin(GL_POINTS);

        for(int i=0; i< _image->size().height();i++)
            for(int j=0; j< _image->size().width();j++)
             _draw_Point(_image->pixel(i,j));
    glEnd();
}