QMouseEvent on QPaintEvent

I want to check for a mouseClickEvent within the paintevent. If it is within a specific coordinates then I would like it to paint another object. Is there a way to set the coordinates to a variable?

Is this a bad way to deal with a paintevent? Is it better to use a set of Qbuttons?

Thank You.

You want to paint an object where ? On a widget ?
Look at QGraphicsScene, maybe it is more suitable for your needs.
If you want to store the coordinates of last clicked position on a widget, reimplement QWidget::mousePressEvent(QMouseEvent * event); and store value of event->pos().
Maybe provide more detailed explanation of what you are trying to achieve.

My intent is to create a tic tac toe game. I have already programmed the main parts of the game and just am looking to ad the functionality of mouseclicks. Right now I have the user select squares through the menubar. So basically I want to link those actions that are now attached to the menubar to mouseevents within given coordinants in the main window. With the program as it now stands, I am using a paintevent to redraw the board and the taken squares.

If you want to see my source I can add that at request.

Ok, so you probably you have some methods like

Code:

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void selectSquare1();
void selectSquare2();
//...

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Then just use mousePressEvent method to get clicked position and determine which square was clicked:

Code:

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void MyWidgetClass::mousePressEvent( QMouseEvent * event ){
    const QPoint pos = event->pos();
    qDebug() << "clicked pos : " << pos;
    // calculate index of square using pos coordinates
    int index = getSquareIndex(pos);
    this->selectSquare( index );
    QMainWindow::mousePressEvent(event);
}

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Too bad your game is almost finished, because using the Qt graphics view framework is more suitable for this kind of 2d graphics programming ( for example, if you want to add possibility of interaction with rendered items ).

Quote:

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Originally Posted by stampede

Ok, so you probably you have some methods like

Code:

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void selectSquare1();
void selectSquare2();
//...

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That is correct.

Quote:

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Originally Posted by stampede

Then just use mousePressEvent method to get clicked position and determine which square was clicked:

Code:

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void MyWidgetClass::mousePressEvent( QMouseEvent * event ){
    const QPoint pos = event->pos();
    qDebug() << "clicked pos : " << pos;
    // calculate index of square using pos coordinates
    int index = getSquareIndex(pos);
    this->selectSquare( index );
    QMainWindow::mousePressEvent(event);
}

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My only confusion is how do I actually compare the pos to given coordinates.
Say the square1 is at the coordinates (20,20), (20,100), (100, 20), (100, 100) within the mainwindow. How do I see if the mousepressevent is within square1?

Thank you

Quote:

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How do I see if the mousepressevent is within square1?

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event->pos() is a QPoint, it has x and y coordinate.
Checking if (x,y) is in [a,b]x[c,d] is very simple math.
But if you dont like math (how dare you!:)), you can always use QRect.

Quote:

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Originally Posted by stampede

event->pos() is a QPoint, it has x and y coordinate.
Checking if (x,y) is in [a,b]x[c,d] is very simple math.
But if you dont like math (how dare you!:)), you can always use QRect.

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I am fine with the math. I am just unclear as to the syntax.

how do I set the x coordinate to posx and the y coordinate to posx?

I realize that this code as it is written may not work.

Code:

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if ((posx < 200) && (posy <200))
    {
        spot11Act();
    }

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Is there any tutorial on how to read the Qt reference documentation. This is basically the first time that I have dealt with actually going through the reference documentation to learn how to use the various functions of the Qt framework. When I look at the reference, all I see is a list of functions and classes.

Thank You Very Much.

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This is basically the first time that I have dealt with actually going through the reference documentation to learn how to use the various functions of the Qt framework

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Then you are very lucky, because Qt has the best refrence manual I've ever seen.

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When I look at the reference, all I see is a list of functions and classes.

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You forgot to add: "... with detailed description of every method, class and module and lots of code samples." :)

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Is there any tutorial on how to read the Qt reference documentation

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I don't know how to help you with this, just read it and you'll get used to it.

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how do I set the x coordinate to posx and the y coordinate to posx?

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posx, posy are of type int ? Well, QPoint is a class, it has x() and y() methods, returning a value of type int...