cocos2d-x inside getContentSize this function in the end mean ah

Who can describe the image, this amount was muddy, very grateful ah!
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Image has a long and wide, right? GetContentSize returns the size of the rectangle is just a logical dimension, rather than pixels.
Reply:
Then fine talk about ah, logical size, trouble
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An example is also OK
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Each sprite will be seen as a rectangle with length and width, the unit is point.