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The x and y coordinates represent pixels on the screen. X is the horizontal postion, and y is the vertical  position. It is important to note that the x and y coordinates also depend on the the object’s reference point, as the x and y coordinates are relative to the this.

X And Y Positioning Illustration

As defined by Corona:

object.x: specifies the x-position (in local coordinates) of the object relative to the parent — the parent’s origin to be precise. Specifically, it provides the x-position of the object’s reference point relative to the parent. Changing the value of this will move the object in the x-direction. Changing the object’s reference point will change the object’s x and y points without moving the object.

object.y: specifies the y-position (in local coordinates) of the object relative to the parent — the parent’s origin to be precise. Specifically, it provides the y-position of the object’s reference point relative to the parent. Changing the value of this will move the object in the y-direction. Changing the object’s reference point will change the object’s x and y points without moving the object.

 

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