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Thread: Newbie needs advice - QGraphics

  1. #1
    Join Date
    Jul 2006
    Qt products

    Default Newbie needs advice - QGraphics

    Thanks in advance

    trying to learn programming and starting with Qt. This is my first program.

    Using a pre-built program Qt 4.2.3 that builds a basic spreadsheet as its central widget
    spreadsheet = new Spreadsheet;

    I dont want a spreadsheet, text edit, or anything like that.

    What I want is a blank mainwindow so I can draw lines on it. Just lines, big and small.

    How do I set my central widget and what do I use QGraphicsScene or QGraphicsView? Whats the difference?

    Looking to make my mainwindow an area I can draw lines on but dont know if I use QGraphicsScene or QGraphicsView.

    Also, what would be the code to use?
    QGraphicsView.= new QGraphicsView;

    Thanks in advance and any help is appreciated.

  2. #2
    Join Date
    Feb 2006
    Thanked 541 Times in 521 Posts
    Qt products
    Unix/X11 Windows

    Default Re: Newbie needs advice - QGraphics

    Close enough:
    Qt Code:
    1. QGraphicsView *view = new QGraphicsView(this);
    2. QGraphicsScene *scene = new QGraphicsScene(view);
    3. scene->setSceneRect( 0, 0, 1000, 1000 ); //you can adjust this as you need
    4. view->setScene(scene);
    5. setCentralWidget(view);
    To copy to clipboard, switch view to plain text mode 

    Next you can start adding items to your scene.
    It would be better to make at least the scene a member of the class, because maybe you want to add items to it as a response to user input, etc( in other functions).

    Also, if you want to provide custom background/foreground for the view ( a grid or a ruler, for example ), then you need to subclass QGraphicsView and reimplement drawBackground/drawForeground.


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