How I could Tell Qpainter where is his Area of Painting...

[j0rt4g4]

I made a GUI with designer.
I got a QWidget object called "areadibujo" that has and predetermined area.
Now the problem is that I dont know how to tell "QPainter" that his Space is That one.

Which is the way to tell it that?

Could be QPainterPath? how i could implemented ? I got days within this.
Am I doing something wrong? any ideas?

No one?

[j0rt4g4]

Is my question wrong formulated ? :S

[high_flyer]

What it is you want to do?
ANY widget that you can see is painted by QPainter.
If you want to change the way a particular widget is being drawn, you should overload the paintEvent() of that widget.

[j0rt4g4]

I got a image like this:

In the Center of this image there's a widget called "areadibujo",
I want to paint ON this area, but I dont know how to do it.

I want to create a code that read a file data
(%f %f ) insert it on a array
a[i] b[i]

And use the array to do some math, and get the points on areadibujo but I guess I'm confused with parents.

Well here's my code:
main.cpp:

#include <QApplication>
#include "fractal.h"
#include "renderarea.h"
 
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    fractal *dialog = new fractal;
   //renderarea *dialog= new renderarea;
 
    dialog->show();
    return app.exec();
}

#include <QApplication>
#include "fractal.h"
#include "renderarea.h"
 
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    fractal *dialog = new fractal;
   //renderarea *dialog= new renderarea;
 
    dialog->show();
    return app.exec();
}

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fractal.h

#ifndef __FRACTAL_H__
#define __FRACTAL_H__
#include "ui_fractals.h"
 
 
class fractal : public QWidget, private Ui::Fractals
{
	Q_OBJECT
 
public:
	fractal(QWidget *parent = 0);
	void updateBrush();
 
public slots:
	void setOpenFileName();
	void QPaintEvent(QPainter *event);
};
 
 
#endif // __FRACTAL_H__

#ifndef __FRACTAL_H__
#define __FRACTAL_H__
#include "ui_fractals.h"


class fractal : public QWidget, private Ui::Fractals
{
	Q_OBJECT

public:
	fractal(QWidget *parent = 0);
	void updateBrush();
	
public slots:
	void setOpenFileName();
	void QPaintEvent(QPainter *event);
};

	
#endif // __FRACTAL_H__

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fractal.cpp

#include <QtGui>
#include <QFile>
#include <QGLWidget>
#include <QtOpenGL>
#include "fractal.h"
 
void tidyFile(QIODevice *inDevice, QIODevice *outDevice)
{
    QTextStream in(inDevice);
    QTextStream out(outDevice);
 
    int endlCount = 0;
    QChar ch;
 
    while (!in.atEnd()) {
        in >> ch;
 
        if (ch == '\n') {
            ++endlCount;
        }
    }
  //  out << endl;
}
 
 
fractal::fractal(QWidget *parent){
	setupUi(this);
	connect( toolButton, SIGNAL( clicked() ), this, SLOT( setOpenFileName() ) );
	connect( boton_aceptar, SIGNAL( clicked() ), this, SLOT( QPaintEvent(QPainter *event) ) );
}
 
 
void fractal::setOpenFileName()
{
	 QFileDialog::Options options;
     options |=QFileDialog::ShowDirsOnly;
 
 
     QString selectedFilter;
     QString fileName = QFileDialog::getOpenFileName(this,
                                 tr("QFileDialog::getOpenFileName()"),
                                 lineEdit->text(),
                                 tr("Todos (*);;Data (*.txt)"),
                                 &selectedFilter,
                                 options);
     if (!fileName.isEmpty())
         lineEdit->setText(fileName);
 
     QFile infile;
     QFile outfile;
     infile.open(stdin, QFile::ReadOnly);
     outfile.open(stdout, QFile::WriteOnly);
     tidyFile(&infile,&outfile);
     QTextStream in(&infile);
     QTextStream out(&outfile);
     int endlCount = 0;
     QChar ch;
     while (!in.atEnd()) {
        in >> ch;
        if (ch == '\n') {
            ++endlCount;
        }
       }
}
 
void fractal::QPaintEvent(QPainter *event){
	QPainter painter(this);
	painter.setRenderHint(QPainter::Antialiasing, true);
	painter.setPen(QPen(Qt::black, 15, Qt::SolidLine, Qt::RoundCap,
                    Qt::MiterJoin));
	painter.setBrush(QBrush(Qt::blue, Qt::DiagCrossPattern));
	painter.drawPie(80, 80, 400, 240, 60 * 16, 270 * 16);
}

#include <QtGui>
#include <QFile>
#include <QGLWidget>
#include <QtOpenGL>
#include "fractal.h"

void tidyFile(QIODevice *inDevice, QIODevice *outDevice)
{
    QTextStream in(inDevice);
    QTextStream out(outDevice);

    int endlCount = 0;
    QChar ch;

    while (!in.atEnd()) {
        in >> ch;

        if (ch == '\n') {
            ++endlCount;
        }
    }
  //  out << endl;
}


fractal::fractal(QWidget *parent){
	setupUi(this);
	connect( toolButton, SIGNAL( clicked() ), this, SLOT( setOpenFileName() ) );
	connect( boton_aceptar, SIGNAL( clicked() ), this, SLOT( QPaintEvent(QPainter *event) ) );
}


void fractal::setOpenFileName()
{
	 QFileDialog::Options options;
     options |=QFileDialog::ShowDirsOnly;
     
        
     QString selectedFilter;
     QString fileName = QFileDialog::getOpenFileName(this,
                                 tr("QFileDialog::getOpenFileName()"),
                                 lineEdit->text(),
                                 tr("Todos (*);;Data (*.txt)"),
                                 &selectedFilter,
                                 options);
     if (!fileName.isEmpty())
         lineEdit->setText(fileName);
     
     QFile infile;
     QFile outfile;
     infile.open(stdin, QFile::ReadOnly);
     outfile.open(stdout, QFile::WriteOnly);
     tidyFile(&infile,&outfile);
     QTextStream in(&infile);
     QTextStream out(&outfile);
     int endlCount = 0;
     QChar ch;
     while (!in.atEnd()) {
        in >> ch;
        if (ch == '\n') {
            ++endlCount;
        }
       }
}

void fractal::QPaintEvent(QPainter *event){
	QPainter painter(this);
	painter.setRenderHint(QPainter::Antialiasing, true);
	painter.setPen(QPen(Qt::black, 15, Qt::SolidLine, Qt::RoundCap,
                    Qt::MiterJoin));
	painter.setBrush(QBrush(Qt::blue, Qt::DiagCrossPattern));
	painter.drawPie(80, 80, 400, 240, 60 * 16, 270 * 16);
}

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I hope I wasn't wasting my time as I hope...

[spirit]

it is wrong

void fractal::QPaintEvent(QPainter *event)

void fractal::QPaintEvent(QPainter *event)

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must be

void fractal::paintEvent(QPaintEvent *event) {
   //draw something
}

void fractal::paintEvent(QPaintEvent *event) {
   //draw something
}

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and then you must draw what you want

[j0rt4g4]

Ok I made Corrections and IT DRAWS (thank you very much)... But It is painting on the BIG Widget (mainwindow) and It is not ON the widget called (areadibujo).

If you want to change the way a particular widget is being drawn, you should overload the paintEvent() of that widget

Could you tell me how I do that in here ?
Thank you very much

[spirit]

is this "areadibujo" independent? if yes then you have to override paintEvent of this widget.

[j0rt4g4]

mmm I guess it is a son of "Fractals"

Isnt it easier make it independient?, T.T because I dont know how to do it independient eighter... (:S what a noobie guy).... I'm trying .

[spirit]

yep. so you can do next: install event filter for this widget and handle paint event and draw what you need, e.g.

Test::Test(QWidget *parent)
	: QMainWindow(parent)
{
	QVBoxLayout *vbl = new QVBoxLayout();
	QWidget *w = new QWidget;
	m_drawer = new QWidget();
	m_drawer->installEventFilter(this);//set event filter
 
	vbl->addWidget(m_drawer);
	vbl->addWidget(new QWidget);
	w->setLayout(vbl);
 
	setCentralWidget(w);
}
 
bool Test::eventFilter(QObject *o, QEvent *e)
{
	if (o == m_drawer && e->type() == QEvent::Paint) {//process paint event of needed widget
		QPainter painter(m_drawer);
		painter.setPen(Qt::blue);
		painter.setFont(QFont("Arial", 30));
		painter.drawText(m_drawer->rect(), Qt::AlignCenter, "Qt");
		return true;
	}
	return QMainWindow::eventFilter(o, e);
}

Test::Test(QWidget *parent)
	: QMainWindow(parent)
{
	QVBoxLayout *vbl = new QVBoxLayout();
	QWidget *w = new QWidget;
	m_drawer = new QWidget();
	m_drawer->installEventFilter(this);//set event filter

	vbl->addWidget(m_drawer);
	vbl->addWidget(new QWidget);
	w->setLayout(vbl);

	setCentralWidget(w);
}

bool Test::eventFilter(QObject *o, QEvent *e)
{
	if (o == m_drawer && e->type() == QEvent::Paint) {//process paint event of needed widget
		QPainter painter(m_drawer);
		painter.setPen(Qt::blue);
		painter.setFont(QFont("Arial", 30));
		painter.drawText(m_drawer->rect(), Qt::AlignCenter, "Qt");
		return true;
	}
	return QMainWindow::eventFilter(o, e);
}

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[j0rt4g4]

Like this?

ui_Fractals.h:

QT_BEGIN_NAMESPACE
 
class Ui_Fractals
{
public:
    QWidget *layoutWidget;
    QHBoxLayout *horizontalLayout_4;
    QVBoxLayout *verticalLayout_2;
    QHBoxLayout *horizontalLayout_3;
    QLabel *label_Archivo;
    QLineEdit *lineEdit;
    QToolButton *toolButton;
    QWidget *areadibujo;
    QVBoxLayout *verticalLayout;
    QHBoxLayout *horizontalLayout;
    QLabel *Iterations;
    QSpinBox *spinbox_ite;
    QSlider *iterator_hslider;
    QSpacerItem *verticalSpacer;
    QHBoxLayout *horizontalLayout_2;
    QPushButton *boton_aceptar;
    QPushButton *boton_salir;
 
    void setupUi(QWidget *Fractals)
    {
    if (Fractals->objectName().isEmpty())
        Fractals->setObjectName(QString::fromUtf8("Fractals"));
    Fractals->resize(605, 408);
    layoutWidget = new QWidget(Fractals);
    layoutWidget->setObjectName(QString::fromUtf8("layoutWidget"));
    layoutWidget->setGeometry(QRect(10, 10, 579, 382));
    horizontalLayout_4 = new QHBoxLayout(layoutWidget);
    horizontalLayout_4->setObjectName(QString::fromUtf8("horizontalLayout_4"));
    horizontalLayout_4->setContentsMargins(0, 0, 0, 0);
    verticalLayout_2 = new QVBoxLayout();
    verticalLayout_2->setObjectName(QString::fromUtf8("verticalLayout_2"));
    horizontalLayout_3 = new QHBoxLayout();
    horizontalLayout_3->setObjectName(QString::fromUtf8("horizontalLayout_3"));
    label_Archivo = new QLabel(layoutWidget);
    label_Archivo->setObjectName(QString::fromUtf8("label_Archivo"));
 
    horizontalLayout_3->addWidget(label_Archivo);
 
    lineEdit = new QLineEdit(layoutWidget);
    lineEdit->setObjectName(QString::fromUtf8("lineEdit"));
    lineEdit->setEnabled(false);
    lineEdit->setMinimumSize(QSize(280, 0));
    lineEdit->setDragEnabled(false);
 
    horizontalLayout_3->addWidget(lineEdit);
 
    toolButton = new QToolButton(layoutWidget);
    toolButton->setObjectName(QString::fromUtf8("toolButton"));
    toolButton->setMinimumSize(QSize(25, 20));
    toolButton->setCheckable(false);
    toolButton->setPopupMode(QToolButton::DelayedPopup);
    toolButton->setArrowType(Qt::NoArrow);
 
    horizontalLayout_3->addWidget(toolButton);
 
 
    verticalLayout_2->addLayout(horizontalLayout_3);
 
    areadibujo = new QWidget(layoutWidget);
    areadibujo->setObjectName(QString::fromUtf8("areadibujo"));
    areadibujo->setMinimumSize(QSize(350, 350));
    areadibujo->setMaximumSize(QSize(500, 500));
    areadibujo->setAutoFillBackground(false);
    areadibujo->installEventFilter(this); ////////////////////////////here!:confused::confused:
 
 
    verticalLayout_2->addWidget(areadibujo);
 
 
    horizontalLayout_4->addLayout(verticalLayout_2);
 
    verticalLayout = new QVBoxLayout();
    verticalLayout->setObjectName(QString::fromUtf8("verticalLayout"));
    horizontalLayout = new QHBoxLayout();
    horizontalLayout->setObjectName(QString::fromUtf8("horizontalLayout"));
    Iterations = new QLabel(layoutWidget);
    Iterations->setObjectName(QString::fromUtf8("Iterations"));
 
    horizontalLayout->addWidget(Iterations);
 
    spinbox_ite = new QSpinBox(layoutWidget);
    spinbox_ite->setObjectName(QString::fromUtf8("spinbox_ite"));
    spinbox_ite->setEnabled(true);
    spinbox_ite->setMinimumSize(QSize(30, 0));
    spinbox_ite->setMinimum(100000);
    spinbox_ite->setMaximum(1000000);
    spinbox_ite->setSingleStep(1000);
    spinbox_ite->setValue(100000);
 
    horizontalLayout->addWidget(spinbox_ite);
 
    iterator_hslider = new QSlider(layoutWidget);
    iterator_hslider->setObjectName(QString::fromUtf8("iterator_hslider"));
    iterator_hslider->setEnabled(true);
    iterator_hslider->setMouseTracking(true);
    iterator_hslider->setMinimum(100000);
    iterator_hslider->setMaximum(1000000);
    iterator_hslider->setSingleStep(1000);
    iterator_hslider->setPageStep(100000);
    iterator_hslider->setValue(100000);
    iterator_hslider->setTracking(true);
    iterator_hslider->setOrientation(Qt::Horizontal);
 
    horizontalLayout->addWidget(iterator_hslider);
 
 
    verticalLayout->addLayout(horizontalLayout);
 
    verticalSpacer = new QSpacerItem(20, 40, QSizePolicy::Minimum, QSizePolicy::Expanding);
 
    verticalLayout->addItem(verticalSpacer);
 
    horizontalLayout_2 = new QHBoxLayout();
    horizontalLayout_2->setObjectName(QString::fromUtf8("horizontalLayout_2"));
    boton_aceptar = new QPushButton(layoutWidget);
    boton_aceptar->setObjectName(QString::fromUtf8("boton_aceptar"));
 
    horizontalLayout_2->addWidget(boton_aceptar);
 
    boton_salir = new QPushButton(layoutWidget);
    boton_salir->setObjectName(QString::fromUtf8("boton_salir"));
 
    horizontalLayout_2->addWidget(boton_salir);
 
 
    verticalLayout->addLayout(horizontalLayout_2);
 
 
    horizontalLayout_4->addLayout(verticalLayout);
 
 
    retranslateUi(Fractals);
    QObject::connect(boton_salir, SIGNAL(clicked()), Fractals, SLOT(close()));
    QObject::connect(spinbox_ite, SIGNAL(valueChanged(int)), iterator_hslider, SLOT(setValue(int)));
    QObject::connect(iterator_hslider, SIGNAL(valueChanged(int)), spinbox_ite, SLOT(setValue(int)));
 
    QMetaObject::connectSlotsByName(Fractals);
    } // setupUi
 
    void retranslateUi(QWidget *Fractals)
    {
    Fractals->setWindowTitle(QApplication::translate("Fractals", "Fractals", 0, QApplication::UnicodeUTF8));
    label_Archivo->setText(QApplication::translate("Fractals", "Archivo:", 0, QApplication::UnicodeUTF8));
    toolButton->setText(QApplication::translate("Fractals", "...", 0, QApplication::UnicodeUTF8));
    Iterations->setText(QApplication::translate("Fractals", "Iterations", 0, QApplication::UnicodeUTF8));
    boton_aceptar->setText(QApplication::translate("Fractals", "&Aceptar", 0, QApplication::UnicodeUTF8));
    boton_salir->setText(QApplication::translate("Fractals", "&Salir", 0, QApplication::UnicodeUTF8));
    Q_UNUSED(Fractals);
    } // retranslateUi
 
};
 
namespace Ui {
    class Fractals: public Ui_Fractals {};
} // namespace Ui
 
QT_END_NAMESPACE
 
 
bool areadibujo::eventFilter(QObject *o, QEvent *e) //////////and here:confused::confused:
{
	if(o == areadibujo && e->type() == QEvent::Paint){
		QPainter painter(areadibujo);
		painter.setPen(Qt::blue);
		painter.setFont(QFont("Arial",30));
		painter.drawText(areadibujo->rect(), Qt::AlignCenter,"Probando");
		return true;
	}
	return Ui_Fractals::eventFilter(o,e);
}
 
#endif // UI_FRACTALS_H

QT_BEGIN_NAMESPACE

class Ui_Fractals
{
public:
    QWidget *layoutWidget;
    QHBoxLayout *horizontalLayout_4;
    QVBoxLayout *verticalLayout_2;
    QHBoxLayout *horizontalLayout_3;
    QLabel *label_Archivo;
    QLineEdit *lineEdit;
    QToolButton *toolButton;
    QWidget *areadibujo;
    QVBoxLayout *verticalLayout;
    QHBoxLayout *horizontalLayout;
    QLabel *Iterations;
    QSpinBox *spinbox_ite;
    QSlider *iterator_hslider;
    QSpacerItem *verticalSpacer;
    QHBoxLayout *horizontalLayout_2;
    QPushButton *boton_aceptar;
    QPushButton *boton_salir;

    void setupUi(QWidget *Fractals)
    {
    if (Fractals->objectName().isEmpty())
        Fractals->setObjectName(QString::fromUtf8("Fractals"));
    Fractals->resize(605, 408);
    layoutWidget = new QWidget(Fractals);
    layoutWidget->setObjectName(QString::fromUtf8("layoutWidget"));
    layoutWidget->setGeometry(QRect(10, 10, 579, 382));
    horizontalLayout_4 = new QHBoxLayout(layoutWidget);
    horizontalLayout_4->setObjectName(QString::fromUtf8("horizontalLayout_4"));
    horizontalLayout_4->setContentsMargins(0, 0, 0, 0);
    verticalLayout_2 = new QVBoxLayout();
    verticalLayout_2->setObjectName(QString::fromUtf8("verticalLayout_2"));
    horizontalLayout_3 = new QHBoxLayout();
    horizontalLayout_3->setObjectName(QString::fromUtf8("horizontalLayout_3"));
    label_Archivo = new QLabel(layoutWidget);
    label_Archivo->setObjectName(QString::fromUtf8("label_Archivo"));

    horizontalLayout_3->addWidget(label_Archivo);

    lineEdit = new QLineEdit(layoutWidget);
    lineEdit->setObjectName(QString::fromUtf8("lineEdit"));
    lineEdit->setEnabled(false);
    lineEdit->setMinimumSize(QSize(280, 0));
    lineEdit->setDragEnabled(false);

    horizontalLayout_3->addWidget(lineEdit);

    toolButton = new QToolButton(layoutWidget);
    toolButton->setObjectName(QString::fromUtf8("toolButton"));
    toolButton->setMinimumSize(QSize(25, 20));
    toolButton->setCheckable(false);
    toolButton->setPopupMode(QToolButton::DelayedPopup);
    toolButton->setArrowType(Qt::NoArrow);

    horizontalLayout_3->addWidget(toolButton);


    verticalLayout_2->addLayout(horizontalLayout_3);

    areadibujo = new QWidget(layoutWidget);
    areadibujo->setObjectName(QString::fromUtf8("areadibujo"));
    areadibujo->setMinimumSize(QSize(350, 350));
    areadibujo->setMaximumSize(QSize(500, 500));
    areadibujo->setAutoFillBackground(false);
    areadibujo->installEventFilter(this); ////////////////////////////here!:confused::confused:


    verticalLayout_2->addWidget(areadibujo);


    horizontalLayout_4->addLayout(verticalLayout_2);

    verticalLayout = new QVBoxLayout();
    verticalLayout->setObjectName(QString::fromUtf8("verticalLayout"));
    horizontalLayout = new QHBoxLayout();
    horizontalLayout->setObjectName(QString::fromUtf8("horizontalLayout"));
    Iterations = new QLabel(layoutWidget);
    Iterations->setObjectName(QString::fromUtf8("Iterations"));

    horizontalLayout->addWidget(Iterations);

    spinbox_ite = new QSpinBox(layoutWidget);
    spinbox_ite->setObjectName(QString::fromUtf8("spinbox_ite"));
    spinbox_ite->setEnabled(true);
    spinbox_ite->setMinimumSize(QSize(30, 0));
    spinbox_ite->setMinimum(100000);
    spinbox_ite->setMaximum(1000000);
    spinbox_ite->setSingleStep(1000);
    spinbox_ite->setValue(100000);

    horizontalLayout->addWidget(spinbox_ite);

    iterator_hslider = new QSlider(layoutWidget);
    iterator_hslider->setObjectName(QString::fromUtf8("iterator_hslider"));
    iterator_hslider->setEnabled(true);
    iterator_hslider->setMouseTracking(true);
    iterator_hslider->setMinimum(100000);
    iterator_hslider->setMaximum(1000000);
    iterator_hslider->setSingleStep(1000);
    iterator_hslider->setPageStep(100000);
    iterator_hslider->setValue(100000);
    iterator_hslider->setTracking(true);
    iterator_hslider->setOrientation(Qt::Horizontal);

    horizontalLayout->addWidget(iterator_hslider);


    verticalLayout->addLayout(horizontalLayout);

    verticalSpacer = new QSpacerItem(20, 40, QSizePolicy::Minimum, QSizePolicy::Expanding);

    verticalLayout->addItem(verticalSpacer);

    horizontalLayout_2 = new QHBoxLayout();
    horizontalLayout_2->setObjectName(QString::fromUtf8("horizontalLayout_2"));
    boton_aceptar = new QPushButton(layoutWidget);
    boton_aceptar->setObjectName(QString::fromUtf8("boton_aceptar"));

    horizontalLayout_2->addWidget(boton_aceptar);

    boton_salir = new QPushButton(layoutWidget);
    boton_salir->setObjectName(QString::fromUtf8("boton_salir"));

    horizontalLayout_2->addWidget(boton_salir);


    verticalLayout->addLayout(horizontalLayout_2);


    horizontalLayout_4->addLayout(verticalLayout);


    retranslateUi(Fractals);
    QObject::connect(boton_salir, SIGNAL(clicked()), Fractals, SLOT(close()));
    QObject::connect(spinbox_ite, SIGNAL(valueChanged(int)), iterator_hslider, SLOT(setValue(int)));
    QObject::connect(iterator_hslider, SIGNAL(valueChanged(int)), spinbox_ite, SLOT(setValue(int)));

    QMetaObject::connectSlotsByName(Fractals);
    } // setupUi

    void retranslateUi(QWidget *Fractals)
    {
    Fractals->setWindowTitle(QApplication::translate("Fractals", "Fractals", 0, QApplication::UnicodeUTF8));
    label_Archivo->setText(QApplication::translate("Fractals", "Archivo:", 0, QApplication::UnicodeUTF8));
    toolButton->setText(QApplication::translate("Fractals", "...", 0, QApplication::UnicodeUTF8));
    Iterations->setText(QApplication::translate("Fractals", "Iterations", 0, QApplication::UnicodeUTF8));
    boton_aceptar->setText(QApplication::translate("Fractals", "&Aceptar", 0, QApplication::UnicodeUTF8));
    boton_salir->setText(QApplication::translate("Fractals", "&Salir", 0, QApplication::UnicodeUTF8));
    Q_UNUSED(Fractals);
    } // retranslateUi

};

namespace Ui {
    class Fractals: public Ui_Fractals {};
} // namespace Ui

QT_END_NAMESPACE


bool areadibujo::eventFilter(QObject *o, QEvent *e) //////////and here:confused::confused:
{
	if(o == areadibujo && e->type() == QEvent::Paint){
		QPainter painter(areadibujo);
		painter.setPen(Qt::blue);
		painter.setFont(QFont("Arial",30));
		painter.drawText(areadibujo->rect(), Qt::AlignCenter,"Probando");
		return true;
	}
	return Ui_Fractals::eventFilter(o,e);
}

#endif // UI_FRACTALS_H

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[spirit]

no, not in generated h-file. you should install filter in that widget for which you set up ui, i.e.

fractal::fractal(QWidget *parent)
: QWidget(parent)
{
    setupUi(this);
    areadibujo->installEventFilter(this);
    connect( toolButton, SIGNAL( clicked() ), this, SLOT( setOpenFileName() ) );
}

fractal::fractal(QWidget *parent)
: QWidget(parent)
{
    setupUi(this);
    areadibujo->installEventFilter(this);
    connect( toolButton, SIGNAL( clicked() ), this, SLOT( setOpenFileName() ) );
}

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