Viewport and canvas transforms

Help
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1

Godot Version

v4.3.stable.official [77dcf97d8]

Question

I need help with the behavior I wrote below. I have been trying for couple of days, checking the forums, reading Viewport and canvas transforms on godot help. But I still couldn’t figure it out.

What I want to achieve:

  • A UI screen will open next to a Node2D node. Node2D node can be at anywhere visible on the screen.

What (I think) I need to figure out:

  • Translate the global_pos of Node2D to screen space
  • Then translate screen space position to InfoGUI canvas position.

Information about my scene:

  • 2D Nodes is the parent for the Node2D that UI will open next to.
  • UI screen element is under InfoGUI (CanvasLayer).
  • Camera2D is the main camera. It can move and zoom in/out
    image
2

I don’t see anything explaining what you’re trying to achieve vs what is actually happening.

3

The picture is only to show how my scene is setup. I didn’t add anything to show what’s happening as I tried so many different things, and none of them worked. I edited my question to make it more clear.

4

I finally found a solution that works for my setup. If anyone needs it for future, here it is:

# scene -> Scene2D node that the UI will appear on the same position with
# main_cam -> Camera2D node which is the main camera
# item_pos -> position of the canvas item (UI screen) that will appear on the same position with the Scene2D node
var screen_pos = scene.position * scene.get_viewport().get_screen_transform()
var item_pos = (screen_pos - main_cam.position) * main_cam.zoom.x
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