Add new value block: mouse_position

[manuq]

Under category Input. Considering the viewport scale as explained in [1]. The same thing we do for the viewport_width and other blocks.

[1] https://docs.godotengine.org/en/stable/tutorials/inputs/mouse_and_input_coordinates.html

Fix #373

[wjt]

Why not write this as:

Suggested change

	code_template = "(func (): var transform: Transform2D = get_viewport_transform(); var scale: Vector2 = transform.get_scale(); return
	get_viewport().get_mouse_position() * scale ).call()
	"
	code_template = "get_viewport().get_mouse_position() * get_viewport_transport().get_scale()"

I tried the following block program for the left paddle in pong:

The generated script is:

extends SimpleCharacter


func _process(delta):
	position = ((func (): var transform: Transform2D = get_viewport_transform(); var scale: Vector2 = transform.get_scale(); return
	get_viewport().get_mouse_position() * scale ).call()


	)

And this fails to start with:

Parser Error: Expected closing ")" after grouping expression.

If I delete all the trailing newlines in this template, the generated code becomes:

extends SimpleCharacter

func _process(delta):
	position = ((func (): var transform: Transform2D = get_viewport_transform(); var scale: Vector2 = transform.get_scale(); return
	get_viewport().get_mouse_position() * scale ).call())

but the error is the same. Maybe it's the newline after return, how did that get in there...

Godot itself keeps crashing when I try to save/run changes...

When I change the template to what I proposed above, the game runs, but the scaling is wrong. It could be that my program is wrong...

[wjt]

Screencast.from.2025-01-30.18-16-11.webm

[manuq]

Maybe we need to add - get_viewport_transform().origin? Thanks for reminding me that Pong is the perfect way to test this, as it has the viewport scaled.

[manuq]

@wjt this was actually easier, using get_global_position(). Our first block targetting CanvasItem. The docs also mention DisplayServer.mouse_get_position for "screen-space coordinates (e.g. when using a non-embedded Popup)". But I don't think that's the case. I tested it in Pong and in a simpler scene:
Video_2025-02-03_10-07-30.webm