Invert Selection

• Hi all!

I’m working with QT in order to create a selection path. But now I would like to invert it, like the photoshop tool you know.

I used the subtracted method to manage to get the invert selection BUT I got only one path. I would like to splite this path into small path/polygons since I use a personal class to print the selections.

I know the methods ToFillPolygons & ToSubpathPolygons exist but they don’t give me what I need.

Here is few drawing to understand what I need:

First, the selections the user do in black: First Selection

Then, in red, the result of the subtracted method: Inverted selection

And here is what I’m looking for: How can I get only the 2 red polygons like this

In a perfect world I would like to get 5 polygons because I cannot deal with hole inside my polygons for the moment, I mean I cannot remove the line which connect outer and inner polygons and I have something like this: ugly result.
Now you can understand why I cannot use ToFillPolygons & ToSubpathPolygons method which give me this following result

• Nobody has an idea?
It's very important and this issue drives me crazy

• You could use operator - like this:

``````QPainterPath p1;

QVector<QPointF> points;
points << QPointF(60.0, 30.0)   << QPointF(100.0, 30.0)
<< QPointF(100.0, 90.0)  << QPointF(0.0, 90.0)
<< QPointF(0.0, 60.0)    << QPointF(60.0, 60.0)
<< QPointF(60.0, 30.0);
QPainterPath p2;

QPainterPath p3 = p1 - p2;
``````

Which gives: • Hii..

Sorry to disturb you but if you are free then please give me answer of below question