[Interest] QtLocation MapPolyLine and MouseArea
maitai at virtual-winds.org
Fri Mar 8 06:19:32 CET 2019
Yes in fact there is a quadtree on top of that.
Le 08-03-2019 02:31, Tony Rietwyk a écrit :
> Hi Philippe,
> Just to confirm - you are filtering your list of lines by using the
> bounding rectangle first, then doing the detailed line-segment check?
> Regards, Tony
> On 8/03/2019 4:32 am, maitai wrote:
>> I need to trigger various actions whenever a MapPolyLine is hovered or
>> pressed, such as displaying a tooltip, a menu, etc.
>> I have put a MouseArea on it with anchors.fills: parent, but the
>> problem is that the mouse area does not represent the line, but the
>> polygon made by the line. For instance if you have a L shape, entered
>> event and so on is triggered when you enter the bounding rectangle of
>> the line, not when you hover over the line itself.
>> On a QGraphicsScene we had the shape() protected method for that kinds
>> of case, for instance with a QPainterPathStroker to give some
>> thickness to the line's "mousearea".
>> I will probably end with a custom property that will carry the pixel
>> distance between the line segments and the mouse coordinates, but this
>> is going to be heavy to compute (I have potentially hundreds of
>> complicated lines on the map).
>> Is there a better way or even better a standard way to do that?
>> Philippe Lelong
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>> Interest at qt-project.org
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