Image processing

[NicNac]

Hi guys
Im new to Qt currently installed Qt4 on Mac OS X, I read through some of the documentation (C++-GUI-Programming-with-Qt-4-1st-ed), but it only gives some basic stuff. I want to load multiple images from the hard disk and display them one after the ohter in a GUI program. I need a starting point. please lead the way im prepared to do all that is needed from my part.

[aamer4yu]

I need a starting point. please lead the way im prepared to do all that is needed from my part.

Refer the Image Viewer example in Qt Demo.

You can very easily show an image on a QLabel. If you want to show multiple images in a single area, you can use QLabel with QTimer to get the effect of slideshow.

Otherwise, you can add QLabel in a layout and display multiple images

Hope this helps

[wysota]

A starting point would be to read about QLabel, QPixmap and QTimer.

[NicNac]

thanks guy i'll give it a look

[NicNac]

Now i can load photos, but i can only do it when i know the exact names of the files. My next mission is to browse a folder and load all the pictures (jpg format for now), display them one after another (a slide show kind of thing). Any suggestions?

[wysota]

QDir and QDir::entryList().

[aamer4yu]

Or may be QFileDialog::getOpenFileNames .

QFileDialog::getOpenFileNames(this,"Select one or more files to open","/home","Images (*.png *.xpm *.jpg)");

[NicNac]

Thanks guys for all your help, i'm making progress on my application. Next mission, I want to customize buttons by say linking the file browsing action with a button. The only options i can find is the ones preinstalled. should i define my own slots or is there a better way?

[wysota]

Read a tutorial and browse Qt Assistant please

[NicNac]

Hi,

i am trying to do a slideshow. I have the images load and everything else work i.e. next, back between the pictures.

I would like to automate it with Qtimer, i call the method to start the slideshow in the method i use the Qtimer like this:

QTimer *timer = new QTimer(this);
                       connect(timer, SIGNAL(timeout()), this, SLOT(nextPicture())); 
                       timer->start(30000);

QTimer *timer = new QTimer(this);
                       connect(timer, SIGNAL(timeout()), this, SLOT(nextPicture())); 
                       timer->start(30000);

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Is this the write way?

[wysota]

Yes, this is ok.

[aurelius]

Hi, I am a newbie in QT4, however really enthusiastic with all the capabilities of it.

What I want to do is to have a grid of images, and display them, like this program

http://www.youtube.com/watch?v=kVcTMAUr3Bw

I mean, I want to display them in a grid and if possible, when I resize the window, the grid and the images contained in it to adjust. I guess I will have to follow

these instructions:

Refer the Image Viewer example in Qt Demo.

Otherwise, you can add QLabel in a layout and display multiple images

Hope this helps

Is this right? I guess, in order for the images to adjust, I will have to use grid layout. Because I can't really recall right now, is it possible to dynamically add widgets inside the QGridLayout, that is I check what images are contained in a directory and display them in a grid mode ? Is this right?

Do you have any other advice or sample code that does sth similar?

P.S. I just found this forum, which was a relief, because the tutorials in QT4 website are basic.