export a variable which is dependent on other exported variable

Volkovino

Hello,
I try to design a resource structure. Now i am in a deadlock for a small issue. The deadlock has been made compacted and scaled down to find quick answer.
Two exported variables are in the resource code. One is edge length of a square. The other one is the area of the square. I only want to change the edge length and display the area value. Even, the area property is touched, it will keep the value as edge dependent area.

tool
extends Resource

class_name Square

export (float) var edgeOfSquare = 10.0 setget edgeOfSquare_set, edgeOfSquare_get
export (float) var areaOfSquare setget areaOfSquare_set, areaOfSquare_get

func edgeOfSquare_set(value1):
	edgeOfSquare = value1
	areaOfSquare = value1 * value1
	print_debug("edgeOfSquare_set")
func edgeOfSquare_get():
	print_debug("edgeOfSquare_get")
	return  edgeOfSquare
 
func areaOfSquare_set(value2):
	areaOfSquare = edgeOfSquare * edgeOfSquare
	print_debug("areaOfSquare_set")
func areaOfSquare_get():
	print_debug("areaOfSquare_get")
	return  areaOfSquare

However, the area variable can not change when the edge variable changes. The area variable changes into calculated value, when clicking the revert symbol or typing a random value in the box only.

is any change requires in setget structure or any automatic revert clicking possibility in code?

thanks in advance

cybereality

Why would the area value need to be exported if you're not supposed to touch it. I'm not sure I understand, it could just be a normal variable. If you just want it for display purposes, then the setget for areaOfSquare_set can do nothing. You don't actually have to update the variable. You can set it on _ready() or only when you set the edge. Then it will be for display only (and edits will not have an effect). But for this to work you need a third value to store that real area (not an export). The edge setget updates the real value and calls set on the area with that calculated value. The set of area does not use the value2 var at all and simply sets the display to show the secret variable. I think that should work.

Volkovino

cybereality

Thanks for your precious comments. However, sometimes, without any specific positive target, "Can it be done?" or "can I do?" questions are enough to proceed.
By the way, i discovered what the required is. It is a method updates properties by using
"property_list_changed_notify()" ..... it may be expensive, but works!!!

Again thanks for concerning and efforts.
Note: i do not know how to attach "SOLVED" sign into my question. Could you arrange that?

Volkovino

cybereality

By the way,
I forgot to explain the starting aim. Before applying some virtual methods such as "init()", "enter_tree", or "ready", it will work!!!

cybereality

Maybe I am unsure of what you are asking, but as long as you figured it out that's cool. You can hit the button that says "select best answer" on the post that has the answer so it will be marked as solved.