Save a QPixmap in a label

MélissaQT

Hello,

I would like to save my picture (QPixmap) as a png in my label, when I finished to add lines and ellipses.
Like describe in the commentaries:

@
//---------------------------------------------Class LabelImage
class LabelImage: public QLabel
{
public:

LabelImage()
{
  this->setMouseTracking(true);
};

void paintEvent (QPaintEvent *event)
{
     QLabel::paintEvent( event );
     QPainter painter(this);
         
          // LINES ANS ELLIPSES TREATMENT LOOPS

         // BACK UP HERE ! like:
         //monPixmap.save("/Users/.../Desktop/GUI Picture/Picture " + 
         //QString::number(NumberOfPicture) +".png","png",100);
                         
                MesureFinished = true;
}

void mousePressEvent (QMouseEvent * event)
{
    if (MesureFinished == false)
    {
        PixelColumn = event->x();
        PixelRow = event->y();
        this->update();
        QLabel::mousePressEvent( event );
    }
};

};
@

MélissaQT

and here the c++ code where I'm using the .h:
@
//---------------------------------------------PICTURE WINDOW
PictureWindow::PictureWindow(QImage Image, int NumberOfPicture) : QWidget()
{
setFixedSize(840, 356);

QPixmap monPixmap;

LabelImage* LabelIMG = new LabelImage();

LabelIMG-> setFixedSize(monPixmap.fromImage(Image).size());

}
@

flaviotordini

No way to go. You have to draw in a QPixmap instead by doing something like:
@QPainter p(pixmap);@
Don't do it inside paintEvent.

Then you can save the pixmap and display it in a QWidget inside paintEvent using painter.drawPixmap(). No need to subclass QLabel, just subclass QWidget.

dheerendra

I'm assuming that you have picture in png format. You need to load this in pixmap and set this to label. Is that correct ?

Load the your png file to PixMap
Set this PixMap to QLabel

Subclassing QLabel and implementing paintEvent will re-draw you label.

IamSumit

Try this..
QString format = "png";

QString fileName=CurrentDirPath+"/"+"image.png"; 

QPixmap originalPixmap; 

originalPixmap=QPixmap::grabWidget(label);


if (!fileName.isEmpty())

    originalPixmap.save(fileName, format.toAscii());

MélissaQT

Thanks all for those answers,

[quote author="Dheerendra" date="1389809506"]I'm assuming that you have picture in png format. You need to load this in pixmap and set this to label. Is that correct ?

Load the your png file to PixMap
Set this PixMap to QLabel

Subclassing QLabel and implementing paintEvent will re-draw you label.

[/quote]

I now back up the picture without figures (circles and ellipses) with this code:

@

//---------------------------------------------Class LabelImage
class LabelImage: public QLabel
{
QPixmap mypix; //----------------------------------------------------NEW
public:

LabelImage()
{
  mypix = ("..."); //---------------------NEW
  this->setPixmap(mypix);//---------------------NEW

  this->setMouseTracking(true);
};

void paintEvent (QPaintEvent *event)
{
     QLabel::paintEvent( event );
     QPainter painter(this);
         
          // LINES ANS ELLIPSES TREATMENT LOOPS
                         
                MesureFinished = true;
                mypix.save(".."); //--------------------------------------NEW
}

void mousePressEvent (QMouseEvent * event)
{
    if (MesureFinished == false)
    {
        PixelColumn = event->x();
        PixelRow = event->y();
        this->update();
        QLabel::mousePressEvent( event );
    }
};

};
@

How I can save picture + figures?

SGaist

Hi,

Are you trying to create something like a Paint program ?

MélissaQT

Hi SGaist,

Yes something like that

SGaist

Then have a look at the Qt's Plug And Paint example, that will provide you a good ground to build on

MélissaQT

Ok I will check. Thank you