CODEWITHSUNDEEP
sprite-kit
max1701
max1701

Reputation: 70

SpriteKit: SKShapeNode.calculateAccumulatedFrame returns a frame, which is bigger than its content

I create a SKShapeNode rectangle with a fixed size using the following code

SKShapeNode *rect = [SKShapeNode shapeNodeWithRect: CGRectMake(0, 0, 100, 200)];
CGRect accumulatedFrame = rect.calculateAccumulatedFrame;

Debugging the code above, the accumulatedFrame holds the values below:

origin=(x=-0.5, y=-0.5) size=(width=101, height=201)

Why is the calculated, accumulated frame bigger than the intended 100x200 ?

Thanks in advance for any hint :)

Code sample:

    SKShapeNode *rect = [SKShapeNode shapeNodeWithRect: CGRectMake(0, 0, 200, 100)];
    CGRect accumulatedFrame = rect.calculateAccumulatedFrame;
    CGRect frame = rect.frame;

debugger returns origin=(x=-0.5, y=-0.5) size=(width=201, height=101) for the accumulated frame property

debugger returns origin=(x=-0.5, y=-0.5) size=(width=201, height=101) for the frame propery

Using an origin > (0,0) adds only 0,5 to width and height; seems, that sprite-kit returns an accumulated frame, which really contains the node(s) and adds 0.5, so none of the node borders intersects the border of the accumulated frame. Didn't find anything about it in the api reference...

Upvotes: 2

Views: 821

Answers (1)

prototypical
prototypical

Reputation: 6751

I believe the issue you are dealing with is that if you have a strokeColor defined, that border stroke adds to size of the rectangle.

Try this code :

SKShapeNode *rect = [SKShapeNode shapeNodeWithRect: CGRectMake(0, 0, 200, 100)];
rect.strokeColor = nil;

You have to look at the stroke as being additive, and adding to the dimensions of your shape.

Upvotes: 2

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