Image.rectTransform Y Adding Random Values

Unity Engine
1

I’m writing a script that moves a Canvas Image to a point on the canvas, then back to it’s original position. I only want to move the image on the X axis.

image.rectTransform.localPosition = new Vector2(newLocationX, imageOriginY); 

//timer here

//inside the timer
image.rectTransform.localPosition = new Vector2(imageOriginX, imageOriginY);

The image moves on the X axis just fine - it moves to the new position, then back. But the Y axis goes from 441 to 1160.433. I want the Y to stay the same. What’s going on?

2

Manipulating RectTransforms is hairy.

The things you THINK you are manipulating are often just properties that feed into a bunch of interim math based on anchoring and scaling and relationships to other objects, and then finally they set the real position.

To do what you want I suggest this approach:

  • make empty GameObjects where you 1) want the canvas to start, 2) want the canvas to end up
  • drag references to those RectTransforms into your script
  • use a tweener or Lerp() to move between the two positions.

That way you can have a chance of getting the anchoring right and getting it to work on all shapes of screens.

Here are some more notes on UI Anchoring, Scaling, CanvasScaler, etc: