Cascades Development

[selvaraman]

Hi,

I want to crop the largest image in bb10.How can i achieve this? any help would be appreciated..

thanks,

[rlvl]

In Image view there will be certain QML properties such as scaling method. Perhaps they will help

[selvaraman]

I need to crop the image and upload to server, when i send to server without crop the image it won't send as like original image, some data's are truncated or something happen unnecessarily. When i received it from server some pixels are not displaying..

[rlvl]

Are you using QML? 

[selvaraman]

yes, but send the image data to server using c++ code.

[rlvl]

Ok, perhaps u can crop it using qml.. And then allow C code to take over

For cropping in qml u can do the following: put the image in Rectangle and set Rectangle’s clip property to true. you will have  to properly position Image with x and y properties.

Found the solution online, but seems legit!

[Zmey]

Hi,

QImage can be used for this:

QImage image("initial_image.jpg");
QImage copy;
copy = image.copy( 0, 0, 128, 128); 
copy.save("cropped_image.jpg");

QImage's contents can also be saved to QByteArray for sending them over network.

QImage can be converted to ImageView for displaying.

[rajuttam]

Can anyone please post the code snippet for cropping the image in BB10?

Thanks in advance.

[zezke]

Here is how I crop a cover image into a thumbnail:

QString tempPath = getAbsoluteTemporaryFolderPath() + filename;
QString thumbnailPath = comic->getThumnailPath();
QImageReader coverImageReader(tempPath);
QImage coverImage = coverImageReader.read();
qDebug() << "DataManager:: cover image width is " << coverImage.width();
if(coverImage.width() > 0)
{
    qDebug() << "DataManager:: size of cover is " << coverImage.numBytes() << " bytes";
    QImage result = coverImage.scaled(COVERWIDTH, COVERHEIGHT, Qt::KeepAspectRatio, Qt::SmoothTransformation);
    result.save(thumbnailPath, "PNG", 50);
    qDebug() << "DataManager:: saved thumbnail to " << thumbnailPath;
}
else
{
    qDebug() << "DataManager:: could not load temporary fullsize image";
}

[rajuttam]

Hi Zezke,

Thanks for the code. Actually my requirement is something different. I have a large image of size suppose 1600x1200. I have to place it inside a container of size  200 x 300 . So i want to crop the image from (0,0) position till (200, 300). 

All the APIs provided in Qt/ QML scaling method are not supporting to do this. How to achieve this?

Thanks,

Uttam