Using QPainter to 'erase' an area of widget?

[altec42lansing]

this worked and painted text with a transparent background over my windows, allowing me to see behind it where the text was not, but im not sure how to apply this to my problem

[Rachol]

Does this help? Use your widget as I have used MyWidget in code below. You don't have to erease anything in your paintEvent

#include <QtGui>
#include <QWidget>
 
class MyWidget : public QWidget
{
public:
    explicit MyWidget(QWidget *parent = 0):QWidget(parent){};
 
protected:
    void paintEvent ( QPaintEvent * );
 
};
 
void MyWidget::paintEvent ( QPaintEvent * )
{
    QPainter p(this);
    p.setPen(QPen(Qt::red,5));
 
    p.drawRect(rect());
}
 
//! [main function]
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
 
    MyWidget widget;
    widget.setFixedSize(300,200);
    widget.setWindowFlags(Qt::WindowFlags(Qt::FramelessWindowHint));
    widget.setAttribute(Qt::WA_TranslucentBackground);
    widget.show();
 
    return app.exec();
}
//! [main function]

#include <QtGui>
#include <QWidget>

class MyWidget : public QWidget
{
public:
    explicit MyWidget(QWidget *parent = 0):QWidget(parent){};

protected:
    void paintEvent ( QPaintEvent * );

};

void MyWidget::paintEvent ( QPaintEvent * )
{
    QPainter p(this);
    p.setPen(QPen(Qt::red,5));

    p.drawRect(rect());
}

//! [main function]
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    MyWidget widget;
    widget.setFixedSize(300,200);
    widget.setWindowFlags(Qt::WindowFlags(Qt::FramelessWindowHint));
    widget.setAttribute(Qt::WA_TranslucentBackground);
    widget.show();

    return app.exec();
}
//! [main function]

To copy to clipboard, switch view to plain text mode 

[altec42lansing]

I hate attached a small file which hopefully demonstrates what i am trying to do

[Rachol]

void MyWidget::paintEvent ( QPaintEvent * )
{
    QPainter p(this);
    p.setPen(QPen(Qt::red,5));
 
    p.fillRect(rect(), Qt::white);
    p.drawText(0,0,width(), height(),Qt::AlignCenter || Qt::TextWordWrap, "THIS IS THE AREA WHERE I DRAW IMG");
 
    p.setCompositionMode(QPainter::CompositionMode_Source);
    p.fillRect(rect().adjusted(0,0,-width()/2,-height()/2), Qt::transparent);
}

void MyWidget::paintEvent ( QPaintEvent * )
{
    QPainter p(this);
    p.setPen(QPen(Qt::red,5));

    p.fillRect(rect(), Qt::white);
    p.drawText(0,0,width(), height(),Qt::AlignCenter || Qt::TextWordWrap, "THIS IS THE AREA WHERE I DRAW IMG");

    p.setCompositionMode(QPainter::CompositionMode_Source);
    p.fillRect(rect().adjusted(0,0,-width()/2,-height()/2), Qt::transparent);
}

To copy to clipboard, switch view to plain text mode