QGraphicsLineItem how to make it easier to select/move the line?

[chaltier]

I have sub classed QGraphicsLineItem, set flag movable and selectable, and draw them to a graphic scene..

problem is the bounding rect is the line itself and it is hard to click/select/move them..

what can i do to make the line easier to be selected?

I've tried reimplementing the boundingRect() with QRectF(0,0,100,100) but yields no results..

also increasing the pen width doesnt help either..

thanks alot..

[wayfaerer]

I would reimplement shape() rather than boundingRect(). shape() is used to detect mouse clicks. The default implementation just calls boundingRect(), though. You could reimplement shape() as something like this:

const int adjustment = 5;
QPainterPath path;
return path.addRect(boundingRect().adjusted(-adjustment, -adjustment, adjustment, adjustment);

const int adjustment = 5;
QPainterPath path;
return path.addRect(boundingRect().adjusted(-adjustment, -adjustment, adjustment, adjustment);

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Not tested, but I think it should work!

[chaltier]

Hi thanks for the reply..

When my line is drawn vertically or horizontally, the adjustment does not make any differences..

When my line is drawn diagonally, it creates a bounding rect with my line as the hypotenuse

i only wan my line to be selected when i click on the line..

thanks againn..

[chaltier]

QPainterPath myLine::shape() const
{
    QPainterPath path;
    QPainterPathStroker stroker;
    stroker.setWidth(30);
    path.moveTo(line().p1());
    path.lineTo(line().p2());
    return stroker.createStroke(path);
}

QPainterPath myLine::shape() const
{
    QPainterPath path;
    QPainterPathStroker stroker;
    stroker.setWidth(30);
    path.moveTo(line().p1());
    path.lineTo(line().p2());
    return stroker.createStroke(path);
}

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this is what i did now..i was able to create an invisible handler for me to click it..

anyone knows how do i set color to it so it wont be invisible?

thanks

[jeevan_ravula]

@Chaltier - Even I m facing the same issue. I reimplemented the QGraphicsLineItem and created my own custom line item. The custom line item is hard to select, press and move. Currently I am using the boundingRect() and shape() methods of QGraphicsLineItem itself. I haven't implemented my own custom methods for these. What shoud I do to fix these issues?