[Interest] QtLocation MapPolyLine and MouseArea

maitai maitai at virtual-winds.org
Fri Mar 8 06:19:32 CET 2019


Hi Tony,

Yes in fact there is a quadtree on top of that.

Philippe.

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:
>> Hi,
>> 
>> 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?
>> 
>> Thanks
>> Philippe Lelong
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