Insert image on other QImage in QLabel

kevin32

Hi everyone, can you help me please?

I would like display qimage on other qimage in qlabel, but i want to size of qimage not resize in qlabel, and insert qimage in special coords of qlabel example top or bot.

thanks for helping

Wieland

@kevin32 Hi! You could create a custom widget, derived from QWidget, and place two QLabels on it.

kevin32

@Wieland thanks, i display my image like that

 // create Qpixmap from Qimage
    QPixmap pix = QPixmap::fromImage(img);
    // display the pixmap on the label
    ui->label->setPixmap(pix);

it's ok, my label and qimage is already in custom widget but, how to insert special coords its possible with setpixamp?

example:
my label : width 800 height 800
my first qimage : width 800 height 800
my second qimage insert dynamically with code : x: 0 , y 50 i would like change coords and size.

http://img11.hostingpics.net/pics/581570example.png

Thanks for you helping :)

Wieland

Changing position and size can be done with void QWidget::setGeometry(int x, int y, int w, int h).

kevin32

@Wieland thanks you very much ```
QPixmap px("C://Users//user//Pictures//a.png");
ui->label->setPixmap(px);
ui->label->setGeometry(0,0,100,100);
if(!px.isNull())
{
ui->label->setPixmap(px);
ui->label->show();
}


Sorry but finally how to resize image for exemple here image of 200:200 display in 100:100 thanks you.

Wieland

You can resize the pixmap before handing it to the label with on of QPixmap's scaled() methods, e.g. QPixmap QPixmap::scaled(const QSize &size, Qt::AspectRatioMode aspectRatioMode = Qt::IgnoreAspectRatio, Qt::TransformationMode transformMode = Qt::FastTransformation) const

QPixmap px("C://Users//user//Pictures//a.png");
px = px.scaled( QSize(100,100) );
ui->label->setPixmap(px);

kevin32

I find other method with ```
QPixmap *pixmap=new QPixmap(ui->label->width(), ui->label->height());
QPainter *painter=new QPainter(pixmap);
painter->drawPixmap(100, 0, 50, 50, QPixmap("C://Users//user//Pictures//a.png"));
painter->drawPixmap(0, 0, 100, 100, QPixmap("C://Users//user//Pictures//1.png"));
painter->end();
ui->label->setPixmap(*pixmap);


ithank you for helping

SGaist

Hi,

You have two memory leaks now. There's no need to allocate pixmap nor painter on the heap.

i.e:

QPixmap pixmap(ui->label->width(), ui->label->height());
QPainter painter=(&pixmap);
painter.drawPixmap(100, 0, 50, 50, QPixmap("C:/Users/user/Pictures/a.png"));
painter.drawPixmap(0, 0, 100, 100, QPixmap("C:/Users/user/Pictures/1.png"));
painter.end();
ui->label->setPixmap(pixmap);