Fit image in QGraphicsView and QGraphicsScene

[deleted396]

Hello friends, i am doing my final project for my bachelor degree and still i ignore too much Qt.

I am trying to fit a image to my GraphicView in my windows but my result is this:

https://ibb.co/bxHTAJ

how you can see, the image isn't fitting to my frame. I found a lot of solutions in internet but anything is working to my project. Which is the problem?

My code:

CPP

#include "interfazmatrizexperto.h"
#include "ui_interfazmatrizexperto.h"
using namespace std;

interfazMatrizExperto::interfazMatrizExperto(const QString rutaImagenFondo, QWidget *parent) :
    QWidget(parent),
    ui(new Ui::interfazMatrizExperto)
{
    ui->setupUi(this);

    //Imagen de fondo
    QPixmap bkgnd("../InterfazKinect/img/foto_index_sinTXT.png");
    bkgnd = bkgnd.scaled(this->size(), Qt::IgnoreAspectRatio);
    QPalette palette;
    palette.setBrush(QPalette::Background, bkgnd);
    this->setPalette(palette);

   /* Here i am trying to display the picture */
    scene = new QGraphicsScene(this);
    scene->setSceneRect(ui->mostrarImagen->rect());
    scene->addPixmap(QPixmap(rutaImagenFondo));
    ui->mostrarImagen->setScene(scene);
    ui->mostrarImagen->show();




    /*
    labelImage = new subQLabel(this);
    labelImage->setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Ignored);
    QPixmap pix(rutaImagenFondo);
    int w = ui->labelImage->width();
    int h = ui->labelImage->height();
    ui->labelImage->setPixmap(pix.scaled(w,h,Qt::KeepAspectRatio));
    ui->labelImage->setAlignment(Qt::AlignCenter);*/

}

interfazMatrizExperto::~interfazMatrizExperto()
{
    delete ui;
}

void interfazMatrizExperto::mousePressEvent(QMouseEvent *event)
{

    QWidget::mousePressEvent(event);

}

void interfazMatrizExperto::resizeEvent(QResizeEvent *evt)
{
    QPixmap bkgnd("../InterfazKinect/img/foto_index_sinTXT.png");//Load pic
    bkgnd = bkgnd.scaled(size(), Qt::IgnoreAspectRatio);//set scale of pic to match the window
    QPalette p = palette(); //copy current, not create new
    p.setBrush(QPalette::Background, bkgnd);//set the pic to the background
    setPalette(p);//show the background pic

    QWidget::resizeEvent(evt); //call base implementation
}

void subQLabel::mousePressEvent(QMouseEvent *event)
{


    cout << "Ha pulsado" << endl;
    int x = event->x();
    int y = event->y();

    cout << "punto x: " << x << " punto y: " << y << endl;

}

subQLabel::subQLabel(QWidget* parent) : QLabel(parent)
{

}

subQLabel::~subQLabel()
{


}

void interfazMatrizExperto::showEvent(QShowEvent *) {
     ui->mostrarImagen->fitInView(scene->sceneRect(),Qt::KeepAspectRatio);
}

void interfazMatrizExperto::on_terminarBottom_clicked()
{

}

void interfazMatrizExperto::on_deshacerbottom_clicked()
{

}

void interfazMatrizExperto::on_comebackbottom_clicked()
{

}

H

#ifndef INTERFAZMATRIZEXPERTO_H
#define INTERFAZMATRIZEXPERTO_H

#include <QWidget>
#include <QMouseEvent>
#include <QImage>
#include <QLabel>
#include <QScrollArea>
#include <iostream>
#include <QPixmap>
#include <QVBoxLayout>
#include <QGraphicsView>
#include <QGraphicsScene>
#include <QGraphicsPixmapItem>

class subQLabel;
class GraphicView;

namespace Ui {
class interfazMatrizExperto;
}

class interfazMatrizExperto : public QWidget
{
    Q_OBJECT

public:
    explicit interfazMatrizExperto(const QString rutaImagenFondo,QWidget *parent = 0);
    ~interfazMatrizExperto();
protected:
    void mousePressEvent(QMouseEvent *event) override;
    void resizeEvent(QResizeEvent *evt);
private slots:
    void on_terminarBottom_clicked();

    void on_deshacerbottom_clicked();

    void on_comebackbottom_clicked();

    void showEvent(QShowEvent *);

private:
    Ui::interfazMatrizExperto *ui;
    subQLabel *labelImage;
    QGraphicsView *mostrarImagen;
    QGraphicsScene *scene;
    QGraphicsPixmapItem *item;
};
///////////////////////////////////////////////////////////////////////////////////////////////////////



class subQLabel : public QLabel
{
    Q_OBJECT

public:
    subQLabel(QWidget* parent);
    ~subQLabel();
    void mousePressEvent(QMouseEvent *event) override;
};



//////////////////////////////////////////////////////////////////////////////////////////////////////////


#endif // INTERFAZMATRIZEXPERTO_H

[SGaist]

Hi,

You shouldn't use the size of a widget in its own constructor. The widget being not yet visible, the value won't make sense.