#include "cvtab.h"
#define MIN(X,Y) ((X) < (Y) ? : (X) : (Y))
#define MAX(a,b) \
    ({ __typeof__ (a) _a = (a); \
    __typeof__ (b) _b = (b); \
    _a > _b ? _a : _b; })
cvTab::cvTab(QWidget *parent) :
    QTabWidget(parent), _image(NULL)//,_model(NULL)
{
    this->setParent(parent);
    _Onglet();

    //  connect(this , SIGNAL(currentChanged(int)),this,SLOT(_currentChangedSlot(int)));
}
void cvTab::paintEvent(QPaintEvent* e){
    if(!_image)
        return;
    QWidget *w=NULL;
    if(currentIndex()==0){


        //QPainter painter(w);

        //QImage I=_image->copy();

        // When no image has been loaded, there's nothing to draw.

        w = widget(0);
        QPainter painter(this);
        painter.drawImage(QPoint(10, 30), *_image);
        //   w->setPixmap(QPixmap::fromImage(*_image));

        //resize(_image->size().height()+10,_image->size().width()+10);
        //adjustSize();

    }
    if(currentIndex()==1){


        int hR[256],hG[256],hB[256];
        calculHist(_image , hR,hG,hB);
        // w =widget(1);
        QPainter painter(this);
        painter.setWindow(-10,-10,300,300);
        QLineF axe_horiz(0, 30, 0, 170);
        QLineF axe_verti(-30, 0, -30, 140);

        painter.setFont(QFont("Calibri", 4));
        painter.drawText(-2,30,"0");
        painter.drawText(-3,148+30,"255");

        painter.save();
        //  painter.rotate(90);
        painter.drawLine(axe_horiz);
        //painter.restore();

        painter.save();
        painter.rotate(-90);
        painter.drawLine(axe_verti);
        painter.restore();
        painter.save();
        painter.rotate(-90);
        QPen penR(QColor("#FF0000"), 1, Qt::DotLine, Qt::FlatCap, Qt::RoundJoin);

        QPen penG(QColor("#33FF00"), 1, Qt::DotLine, Qt::FlatCap, Qt::RoundJoin);
        // painter.setPen(penHLines);
        QPen penB(QColor("#0000FF"), 1, Qt::DotLine, Qt::FlatCap, Qt::RoundJoin);
        //painter.setPen(penR);
        //recher des du max
        double maxR=0,maxG=0,maxB=0;
        for (int i = 0; i < 256; i++)
        {
            maxR= MAX(maxR,hR[i]);
            maxG= MAX(maxG,hG[i]);
            maxB= MAX(maxB,hB[i]);
        }
        for (int i = 0; i < 256; i++)
        {
            painter.setPen(penR);
            painter.drawPoint(-i-30,hR[i]/maxR *170 );
            painter.setPen(penB);
            painter.drawPoint(-i-30,hB[i]/maxB *170 );
            painter.setPen(penG);
            painter.drawPoint(-i-30,hG[i]/maxG *170 );
        }
        painter.restore();
        painter.save();
        painter.rotate(90);
        painter.save();
        //resize(_image->size().height()+10,_image->size().width()+10);
        //adjustSize();
    }
    if(currentIndex()==2){
        if(_image)
            Histogramme_3D._setImg(_image);

    }

    show();
    QWidget::paintEvent(e);
}

void cvTab::calculHist(QImage* image , int* histR,int*histG,int* histB)
{
    int i;
    if(image->allGray())
        return;
    /* initialisation de l'histogramme a 0*/
    for(i = 0; i < 256;i++){
        histR[i]=0;
        histG[i]=0;
        histB[i]=0;
    }
    /* calcule des valeur de l'histogramme */
    for(int x = 0; x < image->width(); x++)
        for(int y=0; y< image->height();y++){
            histR[qRed(image->pixel(x,y))]++;
            histG[qGreen(image->pixel(x,y))]++;
            histB[qBlue(image->pixel(x,y))]++;
        }
}

void cvTab::setImg(QImage* Img){
    if(Img)
        _image=Img;

}

//Slot that is called when Tab selection changes
void cvTab::_currentChangedSlot(int index)
{
    if(currentIndex()==index)
        return;
    currentWidget()->hide();
    setCurrentIndex(index);
    currentWidget()->show();
    // update();
}

void cvTab::_Onglet()
{
    addTab(&Visuel,tr("Visuel"));
    addTab(&Histograme_2D,tr("Histograme 2D"));
    addTab(&Histogramme_3D,tr("Histogramme 3D"));
    //setCurrentWidget(ajout);
    connect(this,SIGNAL(currentChanged(int)), this,SLOT(_currentChangedSlot(int))) ;
}