lhuanyu/swiftclipper

A Swift version of polygon clipper.

swiftclipper's Issues

How clipper.execute cliptype .union returns an array of CGPoint

Hi. I believe clipper.execute populates the Path object after .union is executed?
I am looking at extracting it to an array of CGPoint. But Path does not seem to have a way to. Please advise?

Memory leak?

First, thank you so much for this library! It is exactly what I needed for a little project I've been working on.

I believe this library is causing a memory leak in my app. I use the "intersection" functionality pretty heavily, and memory usage goes up over time. Analysis with Instruments and other Xcode tools leaks me to think that there is a strong circular reference between OutPt types, as shown in this image:

I believe I was able to eliminate the leak by making next and prev weak (but I did a lot of messy workarounds to prove that out - I probably broke other functionality in the process).

I believe TEdge has a similar issue:

Please let me know if you need more information. I can put some time into trying to create a minimal repro if needed.

Please Provide sample code for execute(:polytree)

Currently getting error
"Error: PolyTree struct is needed for open path clipping."

But I have no clue how to use .execute(:polytree)

Cannot instasntiate PolyTree()

Possible to do union between "Paths"?

I have two Paths - previousPaths and currentPaths, and I wish to find the intersections between them, as a single Paths. My thought here is that I could potentially find the intersections between currentPaths and each individual Path in previousPaths, which gets me an array of Paths. Now, I wish to unionise them. Perhaps I'm taking the wrong approach, but it's unclear to me how to do this.

Does there needed to be a function added for union(path: Path)?

var intersections = [Paths]()

for path in previousPaths {
	let intersection = currentPaths.intersection(path)
	intersections.append(intersection)
}