QPainter does not paint anything

[ivicts]

Hi, I am new to QT.
Here , I am trying to build tictactoe, so I have to draw rectangles in tictactoe. First , I create dialogs that ask the game settings. Then, after that I create dialog that will be the tictactoe game itself .

void Board::paintEvent(QPaintEvent *e)
{
painter = new QPainter(multiPlayerDialog);
painter->fillRect(multiPlayerDialog->rect(),QColor(105,105,105));
QPen borderPen(Qt::black);
borderPen.setWidth(5);
painter->setPen(borderPen);
painter->drawRects(boardRects,9); //draw 9 rectangle

for(int i= 0; i<constTileSquare;i++)
{
    QString path;
    switch(displayBoard[i])
    {
    case EMPTY:
        path= "";
        break;
    case X:
        path=":/images/X.png";
        break;
    case O:
        path=":/images/O.png";
        break;
    }

    painter-> drawPixmap(boardRects[i].x()+10,   boardRects[i].y()+10,boardRects[i].width()-20,  boardRects[i].height()-20,QPixmap(path));
} 

}

void Board::multiPlayer()

{

 delete dialogGetPlayerName;

  multiPlayerDialog = new QDialog(this);

  multiPlayerDialog->setWindowTitle("Multi Player Tic Tac Toe");

  multiPlayerDialog->setFixedSize(constTile*100,constTile*100);

   QSize size(100,100);
    boardRects[0] = QRect(QPoint(0,0),size);
    boardRects[1] = QRect(QPoint(0,100),size);
    boardRects[2] = QRect(QPoint(0,200),size);
    boardRects[3] = QRect(QPoint(100,0),size);
    boardRects[4] = QRect(QPoint(100,100),size);
    boardRects[5] = QRect(QPoint(100,200),size);
    boardRects[6] = QRect(QPoint(200,0),size);
    boardRects[7] = QRect(QPoint(200,100),size);
    boardRects[8] = QRect(QPoint(200,200),size);

player = X;
multiPlayerDialog->show();

}

However, it does not show any rectangle. It just shows a new blank window. What's wrong?
How do you do painting in another dialog besides the main dialog? How to tell the QPaintEvent to work only on this multiplayerPlayerDialog?

[SGaist]

Hi and welcome to devnet,

Short answer: you don't.

Longer answer: each widget is responsible for its own painting. So you should configure you custom dialog with whatever parameters are needed and let it handle the painting.

[ivicts]

Hi,
Thank you for your reply
it actually work if I change multiPlayerDialog -> show() to this-> show() .
Is it what do you mean? So, it is because I created the BoardRects at the class not at the dialog itself?

[SGaist]

I knew I missed something :D

You are currently doing your custom painting in Board not in multiplayerDialog which is just an empty QDialog. That's why calling show on Board shows you what you want.