CODEWITHSUNDEEP
qtqt4
user1159845
user1159845

Reputation: 71

How to merge QPainterPaths

I need to "merge" two QPainterPath together. The problem is that they always seems to be two different paths.

What I need is that the merge really become the sames as if a single one ( from a complex polygon or a complex bunch of lines) had been constructed, without any inner line artifacts or subpath from the fact that they were two distinct paths previously. It seems a pretty simple and normal task but I can't figure how to do it.

Upvotes: 4

Views: 2362

Answers (3)

NoDataDumpNoContribution
NoDataDumpNoContribution

Reputation: 10859

It might help to first merge the paths using the overloaded + operator and then call simplified() on it. QPainterPath reference

At least that solved the problem for me when I had two paths of two squares that had one edge in common and without a call to simplified() it would still be two squares but with it would be one rectangle as expected.

Upvotes: 2

Luke
Luke

Reputation: 11644

If you start with two paths p1 and p2, each containing a single subpath, then:

joined = p1.toSubpathPolygons()[0] + p2.toSubpathPolygons()[0]
p3 = QPainterPath()
p3.addPolygon(joined)

You can also change the direction that each path is joined by using path.toReversed(). (sorry, this is python syntax but should be nearly the same for C++)

Upvotes: 1

Bertrand Moreau
Bertrand Moreau

Reputation: 396

I would say that the united(QPainterPath) method (QPainterPath class) is the one you are looking for, if you did not try it yet. Or maybe subtracted(QPainterPath), or intersected(QPainterPath), depending on what you try to achieve.

Could you please give us more details about what you've tried so far?

Upvotes: 2

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