"sprite.position.x =" vs "sprite.x ="

[Tobi Reif]

In a Pixi project I have many lines like this:

spriteFoo.position.x = someValue;

When I delete the ".position" in all of these lines

spriteFoo.x = someValue;

everything still works.

What's the intended use of ".position" ?

[ivan.popelyshev]

Its architectural decision.

".position" is the real stuff, while ".x" is just a shortcut property that is used by newbies. "position", "scale", "skew", "pivot", and "anchor" and some other things are Points. Some useful functions are working with Point type. Also, imagine that sprite will have "positionX", "positionY", "scaleX", "scaleY", "skewX", "skewY", "pivotX", "pivotY", "anchorX", "anchorY". It will be a disaster. 

In next version (v4) "transform.position" will be real stuff, while ".position" and ".x" will be properties. Transform type will differ for 2d sprites and 3d ones.

 

[tips4design]

Yea,  spriteFoo.x  is just an alias for  spriteFoo.position.x

 

Here is the link in the Pixi.js source where those aliases are actually created: https://github.com/pixijs/pixi.js/blob/master/src/core/display/DisplayObject.js#L165

    x: {
        get: function ()
        {
            return this.position.x;
        },
        set: function (value)
        {
            this.position.x = value;
        }
    },

 

[Tobi Reif]

I'll use ".position.x" and ".position.y", it could be a tiny bit faster because it's more direct than the short version.

[d13]

2 minutes ago, Tobi Reif said:

I'll use ".position.x" and ".position.y", it could be a tiny bit faster because it's more direct than the short version.

I'm pretty sure performance is exactly the same for both.

[Tobi Reif]

Depends ... eg https://bugzilla.mozilla.org/show_bug.cgi?id=626021 .