How to draw a line with tiled images with QPainter?

[MadBear]

Greetings,

I would like to know if it is possible to draw a line with tiled images as a background on it. I have tried to use QPen (width=20) with QBrush and Qt:TexturePattern, but this did not work correctly. Is there another way?

Thank you,
MadBear

[Santosh Reddy]

try using QPen width 0 and QBrush::TexturePattern

...but this did not work correctly. Is there another way?

What you mean by this, show the sample output, so that someone can point out the problem.

[MadBear]

Greetings,

Thank you for your reply. Ok I will try to explain what I am trying to do. I must create QGraphicsItem that is like police tape (you see it in crime scenes) that prevents civilians to cross (it is a tape that says "POLICE - STOP" in constant intervals). My idea is that user clicks control points and then I create QPainterPath with lines through those control points. Control points can also be moved around QGraphicsScene. The problem is that line betwen control points. How can I create line that looks like that police tape. I have tried with texture for QBrush, but that created something like:

PO
LI
CE
-
ST
OP

Is there perhaps a different way how I can create this?

Thank you,
MadBear

[Santosh Reddy]

Will this work

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , Ui::MainWindow()
{
    setupUi(this);
 
    QGraphicsScene * scene = new QGraphicsScene(this);
    graphicsView->setScene(scene);
 
    QPoint point1(0, 0);
    QPoint point2(1000, 0);
 
    addBanner(scene, point1, point2, "POLICE - STOP");
}
 
void MainWindow::addBanner(QGraphicsScene * scene
                            , const QPoint & start
                            , const QPoint & end
                            , const QString & text) const
{
    const int height = 25;
    const int spaceing = 40;
    QPen pen(Qt::black, 2, Qt::SolidLine, Qt::FlatCap, Qt::MiterJoin);
    QBrush brush(Qt::yellow);
    QFont font("Arial", 12);
    QPoint pos(start);
 
    QRect rect = QRect(start, QPoint(end.x(), end.y() + height));
    QGraphicsRectItem * rect_item = scene->addRect(rect ,pen, brush);
    rect_item->setFlag(QGraphicsItem::ItemClipsChildrenToShape);
 
    while(pos.x() < end.x())
    {
        QGraphicsTextItem * item = new QGraphicsTextItem(text, rect_item, scene);
        item->setFont(font);
        item->setPos(pos);
        item->clipPath();
        pos.setX(pos.x() + spaceing + item->boundingRect().right());
    }
}

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , Ui::MainWindow()
{
    setupUi(this);

    QGraphicsScene * scene = new QGraphicsScene(this);
    graphicsView->setScene(scene);

    QPoint point1(0, 0);
    QPoint point2(1000, 0);

    addBanner(scene, point1, point2, "POLICE - STOP");
}

void MainWindow::addBanner(QGraphicsScene * scene
                            , const QPoint & start
                            , const QPoint & end
                            , const QString & text) const
{
    const int height = 25;
    const int spaceing = 40;
    QPen pen(Qt::black, 2, Qt::SolidLine, Qt::FlatCap, Qt::MiterJoin);
    QBrush brush(Qt::yellow);
    QFont font("Arial", 12);
    QPoint pos(start);

    QRect rect = QRect(start, QPoint(end.x(), end.y() + height));
    QGraphicsRectItem * rect_item = scene->addRect(rect ,pen, brush);
    rect_item->setFlag(QGraphicsItem::ItemClipsChildrenToShape);

    while(pos.x() < end.x())
    {
        QGraphicsTextItem * item = new QGraphicsTextItem(text, rect_item, scene);
        item->setFont(font);
        item->setPos(pos);
        item->clipPath();
        pos.setX(pos.x() + spaceing + item->boundingRect().right());
    }
}

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[MadBear]

Greetings,
Thank you for your reply. But it does not work quite the way I wanted it. I did not notice, that this forum erased all my spaces in my example. So that was supposed to be a diagonal line (not vertical). And when I changed point2 to (1000, 30) the program didn't work anymore.
Thank you again.

Regards,
MadBear

[Santosh Reddy]

The example I post will work only for horizontal banners, you need to modify it for drawing to diagonal, using QPainterPath (you cannot use QGraphicsRectItem and QGraphicsTextItem)

I was only trying to give an example