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Retrieve size of a CCSkeletonAnimation

danielrodriguez

Hi all,

I was wondering, how can I retrieve the size of an CCSkeletonAnimation ? I need it to compute where to place my CCSkeletonAnimation instances with respect to each other, in a project where the textures change (different atlases for some characters that share the animation)

I've tried the following commands and they always return an empty CGPoint :

[ccSkeletonAnimInstance contentSize]

[ccSkeletonAnimInstance boundingBox]

I'm using spine 1.1 with Cocos2D 2.1. Running on several iPad (iOS 7, 8 and up).

Thanks!

danielrodriguez

toojuice

I had the same problem with cocos2d-x initially. Until you have started an animation, the contentSize and boundingBoxs are zero. To get around this, in my init function:

1) set an initial animation
2) call SkeletonAnimation::update and pass in 0 (i.e. the starting pose of the animation)
3) if necessary, clear the track

After this, I can poll boundingBox

Nate

Thanks, toojuice. The skeleton hasn't been posed yet, so the bounds are zero.

danielrodriguez

This is great, thank you so much!

By the way, how would you go about rendering such bound around the animating element ?

I thought of adding this code, but there's an offset which I cannot account for :

// CCSkeleton::-draw
// near end of method...
if (_debugRect) { // a new property I added for debugging...
        // Position and bounding box
        CGPoint pos =  [[self parent] convertToWorldSpace:[self position]];
        CGRect bb = [self boundingBox];
       // draw the rect...
        glLineWidth(2);
        ccDrawColor4B(255, 0, 0, 255);
        CGPoint points[4];
        points[0] = ccp(pos.x, pos.y);
        points[1] = ccp(pos.x + bb.size.width, pos.y);
        points[2] = ccp(pos.x + bb.size.width, pos.y + bb.size.height);
        points[3] = ccp(pos.x, pos.y + bb.size.height);
        ccDrawPoly(points, 4, true);
    }

Nate

The bounding box is in the coordinates of the CCSkeletonAnimation node. Pseudo code:

points[0] = ccp(pos.x + bb.x, pos.y + bb.y);
points[1] = ccp(pos.x + bb.x + bb.width, pos.y + bb.y);
points[2] = ccp(pos.x + bb.x + bb.width, pos.y + bb.y + bb.height);
points[3] = ccp(pos.x + bb.x, pos.y + bb.y + bb.height);