[PIXI] Anchor vs Pivot

[d13]

Hey everyone... I'm trying to understand the difference between Pixi's  `anchor` and `pivot`

This is what I've been able to deduce so far...

 

Anchor shifts the origin point of the sprite's image texture, using a 0 to 1 normalized value.

Pivot shifts the origin of the sprite's x and y point, using pixel values.

 

Is this correct - or brain-dead? 

[xerver]

That is correct. The anchor is the attachment point for a texture (normalized to the size of the sprite), the pivot point is the point around which an object rotates (in pixel values).

[d13]

That is correct. 

Thank you so much for that confirmation!

[caymanbruce]

So pivot.set(x, y) just means setTransform(1, 0, 0, 1, x, y) in Canvas API?

[xerver]

Kind of.

[caymanbruce]

5 hours ago, xerver said:

Kind of.

But I am still confused with the use of pivot in different coordination system. 

For example, I have a map which is a TilingSprite with origin at (0, 0) and it's larger than the canvas size. I want my player sprite in the center of the canvas and it can move around the map. So I use a camera to do that. Suppose my camera is at (camera.x, camera.y) of the map, now the coordination system still has origin at (0, 0).

Now if I set my map position:

map.position.set(render.view.width / 2, render.view.height / 2);

and change its pivot:

map.pivot.set(render.view.width / 2, render.view.height / 2);

It will shift the map origin to the center of the canvas and now the new (0, 0) is actually (render.view.width / 2, render.view.height / 2)? Why can't I just set pivot point as  (render.view.width / 2, render.view.height / 2) without shifting the position? If I don't set the position to  (render.view.width / 2, render.view.height / 2) the map stays at the same place and a pivot set doesn't have any effect. If I scale the map it will still scale to the original (0, 0).

More confusing is that when I move my player my camera moves. But setting the map's pivot to the center of canvas still works as before. How does pivot translate my coordinates when my player's actual (x, y) changes?

[xerver]

Because pivot affects the *transform* of the object. That means position and rotation.

[caymanbruce]

5 hours ago, xerver said:

Because pivot affects the *transform* of the object. That means position and rotation.

Thanks that really helps. I have found solutions for my game map.