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Have any documents about how to create bounding box and use

ucchen

Have any documents or videos about how to create bounding box and use?
because, i haven't found any documents about that in documentation or videos.

ucchen

Nate

I'm afraid currently there are only code examples:
https://github.com/EsotericSoftware/spi ... n.cpp#L117

Basically you update a SkeletonBounds with a skeleton and the SkeletonBounds. For each BoundingBoxAttachment currently on the skeleton, SkeletonBounds stores the polygon vertices. You can then access the polygons directly or use SkeletonBounds methods to do hit detection.

SkeletonBounds is just a convenience class. Instead you could do what SkeletonBounds#update(Skeleton) does, which is find BoundingBoxAttachments, compute the world vertices for the polygon, and then do something.

ucchen

Oh, thanks Nate. But actually i want to know how to draw this bounding box in spine. 🙁
Loading Image

Nate

Click a slot, choose "New...", choose "Bounding Box", click to add points, click the first points to finish the polygon.

ucchen

en..... :yes: thank you very much.

Krøllebølle

Nate написал
You can then access the polygons directly or use SkeletonBounds methods to do hit detection.

Could you please elaborate a bit on this, Nate? I looked at the following method in SkeletonBounds (libgdx):

/** Returns true if the axis aligned bounding box contains the point. */
public boolean aabbContainsPoint (float x, float y) {
	return x >= minX && x <= maxX && y >= minY && y <= maxY;
}

It seems to me that this method returns true if the argument point is within the rectangle that is established by [minX,minY] to [maxX,maxY], is this correct? That is what I should interpret aligned bounding box as?

If so, this would mean that this method would, well ... suck, for very skew bounding boxes, would it not? For a triangle this could be very wrong, but for more rectangle shaped bounding boxes this would be ok. Just so I know what I am facing 🙂

I can't really see how to implement this in my libgdx game either. For Actors I can use InputListener and GestureListener and then do

Actor hit = stage.hit(event.getStageX(), event.getStageY(), true);

but how can I get a listener for the Spine bounding boxes? Should I just call

aabbContainsPoint(event.getStageX(), event.getStageY())

instead?

Nate

Krøllebølle написал
If so, this would mean that this method would, well ... suck, for very skew bounding boxes, would it not? For a triangle this could be very wrong

No, it is never wrong. 🙂 AABB is axis aligned bounding box. There are other methods if AABB hit detection is not what you want. AABB is cheap so is often used to see if it is worth doing a more expensive hit detection.

Krøllebølle написал

but how can I get a listener for the Spine bounding boxes? Should I just call

aabbContainsPoint(event.getStageX(), event.getStageY())

instead?

Sure, you can do that.