[Interest] QtLocation MapPolyLine and MouseArea

Tony Rietwyk tony at rightsoft.com.au
Fri Mar 8 02:31:45 CET 2019


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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