Resources files (.qrc) not working

[degs2k4]

Did you saw the image after that?

No, I didn't....

I think that the resource file is correctly added: I edited this line, adding an icon from the resource file:

QIcon MyCanvasViewPlugin::icon() const
{
    return QIcon(":/images/qtlogo.png");
}

QIcon MyCanvasViewPlugin::icon() const
{
    return QIcon(":/images/qtlogo.png");
}

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and this image appeared in QtDesigner on the WQidget Box next to the custom widget.

The load image function is also working fine, but calling the slot addButterfly() makes no effect when using the Q3CanvasPolygonalItem class.

UPDATE

the slot addButterfly() uses the class Q3CanvasPolygonalItem for displaying the image. I found this on the Internet:

The Q3CanvasPolygonalItem class provides a polygonal canvas item on a Q3Canvas. More...

#include <Q3CanvasPolygonalItem>

This class is part of the Qt 3 support library. It is provided to keep old source code working. We strongly advise against using it in new code. See Porting to Qt 4 for more information.

Note to Qt Desktop Light Edition users: This class is only available in the Qt Desktop Edition.

Maybe I should use the class QAbstractGraphicsShapeItem instead?

Any suggerences?

[jacek]

No, I didn't....

So maybe the resources work and the problem is in the code that displays the image?

What happens if you add:

QLabel l;
l.setPixmap( QPixmap( ":/images/butterfly.png" ) );
l.show();

QLabel l;
l.setPixmap( QPixmap( ":/images/butterfly.png" ) );
l.show();

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just before return app.exec()?

Maybe I should use the class QAbstractGraphicsShapeItem instead?

No, you have to use Q3CanvasItem subclass, if you want to stick with Q3Canvas.

[degs2k4]

What happens if you add:
Qt Code:

QLabel l;
 l.setPixmap( QPixmap( ":/images/butterfly.png" ) );
 l.show();

QLabel l;
 l.setPixmap( QPixmap( ":/images/butterfly.png" ) );
 l.show();

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just before return app.exec()?

If I do that, I can see the image !

So the problem is in addButterfly() slot then, right?

[jacek]

So the problem is in addButterfly() slot then, right?

Try showing Q3CanvasPixmap instead of your custom item.

What does ImageItem contructor do with the second parameter?

[degs2k4]

Try showing Q3CanvasPixmap instead of your custom item.

What does ImageItem contructor do with the second parameter?

Does this:

ImageItem::ImageItem( QImage img, Q3Canvas *canvas )
    : Q3CanvasRectangle( canvas ), image(img)
{
    setSize( image.width(), image.height() );
    imageRTTI = 984376;
#if !defined(Q_WS_QWS)
    pixmap.fromImage(image, Qt::OrderedAlphaDither);
#endif
}

ImageItem::ImageItem( QImage img, Q3Canvas *canvas )
    : Q3CanvasRectangle( canvas ), image(img)
{
    setSize( image.width(), image.height() );
    imageRTTI = 984376;
#if !defined(Q_WS_QWS)
    pixmap.fromImage(image, Qt::OrderedAlphaDither);
#endif
}

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[jacek]

Does this:

This looks OK (except that image and pixmap variables esentially hold the same data).

How does drawShape() implementation look like?

[degs2k4]

This looks OK (except that image and pixmap variables esentially hold the same data).

How does drawShape() implementation look like?

OK, the problem was with drawShape. drawShape() of ImageItem looked like this:

void ImageItem::drawShape( QPainter &p )
{
// On Qt/Embedded, we can paint a QImage as fast as a QPixmap,
// but on other platforms, we need to use a QPixmap.
#if defined(Q_WS_QWS)
    p.drawImage( int(x()), int(y()), image, 0, 0, -1, -1, OrderedAlphaDither );
#else
    p.drawPixmap( int(x()), int(y()), pixmap );
#endif
}

void ImageItem::drawShape( QPainter &p )
{
// On Qt/Embedded, we can paint a QImage as fast as a QPixmap,
// but on other platforms, we need to use a QPixmap.
#if defined(Q_WS_QWS)
    p.drawImage( int(x()), int(y()), image, 0, 0, -1, -1, OrderedAlphaDither );
#else
    p.drawPixmap( int(x()), int(y()), pixmap );
#endif
}

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And I changed it to this:

void ImageItem::drawShape( QPainter &p )
{
// On Qt/Embedded, we can paint a QImage as fast as a QPixmap,
// but on other platforms, we need to use a QPixmap.
#if defined(Q_WS_WIN)
    p.drawImage( int(x()), int(y()), image, 0, 0, -1, -1, Qt::OrderedAlphaDither );
#else
    p.drawPixmap( int(x()), int(y()), pixmap );
#endif
 
}

void ImageItem::drawShape( QPainter &p )
{
// On Qt/Embedded, we can paint a QImage as fast as a QPixmap,
// but on other platforms, we need to use a QPixmap.
#if defined(Q_WS_WIN)
    p.drawImage( int(x()), int(y()), image, 0, 0, -1, -1, Qt::OrderedAlphaDither );
#else
    p.drawPixmap( int(x()), int(y()), pixmap );
#endif

}

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And the butterfly was at last displayed !

So the problem is with Q_WS_QWS (maybe because it is from Qtopia?): used for detecting the type of windowing system that is used with Qt. Correspondingly there exist Q_WS_X11 and Q_WS_WIN that are set when compiling with Qt/X11 or Qt/Windows (and there's one
for mac in Qt3 versions).

Of course I can't just remove the macro that easily.... Why it didn't work when using Q_WS_QWS? It is OK to use Q_WS_X11, Q_WS_WIN... instead?

(I'm using windows...)

[jacek]

The problem is ImageItem::ImageItem(). It should be:

pixmap = QPixmap::fromImage(image, Qt::OrderedAlphaDither);

pixmap = QPixmap::fromImage(image, Qt::OrderedAlphaDither);

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[degs2k4]

The problem is ImageItem::ImageItem(). It should be:

pixmap = QPixmap::fromImage(image, Qt::OrderedAlphaDither);

pixmap = QPixmap::fromImage(image, Qt::OrderedAlphaDither);

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OH!!!! I see:

The Qt3 version was returning a BOOL ! :

bool QPixmap::convertFromImage ( const QImage & image, ColorMode mode )

and the Qt4 version is returning the Pixmap which I have to grab explicitely !

QPixmap QPixmap::fromImage ( const QImage & image, Qt::ImageConversionFlags flags = Qt::AutoColor )

THANKS!!!!!!!!!!!!!!!!!!!!!!!!!!!