Can I define "structs" in java script?

Unity Engine
1

Hi, I need to create a data structure that can hold multiple different types of variables, i then need to make an array using this structure. However I am new to Javascript. basically what I want to do is the following C++ code but in java script.

struct ActionBar
{
         Button Buttons[6];
}

struct Button
{
         Rect Button;
         Texture2D Icon;
         bool onCoolDown;
         float CDLeft;
}

public int main()
{
         Texture2D ButtonIcon;

         ActionBar ActionBars[2]
         for(int i = 0; i <= 2; i++)
         {
                  for(int j = 0; j <= 6; j++)
                  {
                           ActionBars[i].Buttons[j].Button = new Rect(10,10,10,10);
                           ActionBars[i]Buttons[j].Icon = ButtonIcon;
                           ActionBars[i].Buttons[j].onCoolDown = false;
                           ActionBars[i].Buttons[j].CDLeft = 4.0f;
                  {
         {
}

Hope you can see what i am getting at, i know that java script has no function to create structs but there is surely a way to create something similar or get around the lack of functionality. Thanks in advance.

2

You can extend System.ValueType to make a struct.

class Button extends System.ValueType

However Button shouldn’t be a struct, it should be a class.

–Eric

3

perfect, thanks for quick response. Pretty stupid not to think of using a class instead of a struct :slight_smile:

4

here is the class i made

class Buttons extends System.ValueType
{
	var Button : Rect;
	var SpellID : int;
	var SpellImage : Texture2D;
	var OnCoolDown : boolean;
	var GlobalCoolDown : boolean;
	var CoolDownLeft : float;
	var GlobalCoolDownLeft : float;
	
	function GetButton()
	{
		return Button;
	}
		function GetSpellID()
	{
		return SpellID;
	}
		function GetSpellImage()
	{
		return SpellImage;
	}
		function GetOnCoolDown()
	{
		return OnCoolDown;
	}
		function GetGlobalCoolDown()
	{
		return GlobalCoolDown;
	}
		function GetCoolDownLeft()
	{
		return CoolDownLeft;
	}
		function GetGlobalCoolDownLeft()
	{
		return GlobalCoolDownLeft;
	}	
}

Here is how i declare an array and assign its elements to use the class i defined

	var ActButtons = new Array(5);
*
*
*
        var X = 77;
	var Y = VerticleResolution - 64 - 38;
	var xAdd = 94;
	
	switch (PlayerStatusInfo.CharacterClass)
	{
		case "Mage":
			for (i = 0; i <= 5; i++)
			{
				ActButtons[i] = Buttons;
				ActButtons[i].Button = new Rect(X + PlayerHUDInfo.ActionBarOffset.x, Y + PlayerHUDInfo.ActionBarOffset.y, 64, 64);
				ActButtons[i].SpellImage = SpellInfo.GetMageSpellIcon(i);
				ActButtons[i].SpellID = ClassInfo.GetMageSpellID(i);
				ActButtons[i].OnCoolDown = false;
				ActButtons[i].GlobalCoolDown = false;
				ActButtons[i].CoolDownLeft = 0.0f;
				ActButtons[i].GlobalCoolDownLeft = 0.0f;
				X = X + xAdd;
			}
			break;
	}

For Some reason when i use this line of code:

if (GUI.Button(ActionButtonsInfo.ActButtons[i].GetButton(), ActionButtonsInfo.ActButtons[i].GetSpellImage()))
				{
					SpellInfo.CastSpell(ActionButtonsInfo.ActButtons[i].GetSpellID());
				}

i get error “InvalidCastException: Cannot cast from source type to destination type.
(wrapper dynamic-method) Buttons.Buttons$GetButton$ (object,object[ ]) <IL 0x00001, 0x00035>
Boo.Lang.Runtime.RuntimeServices.Invoke (object,string,object[ ]) <IL 0x0004c, 0x00125>
PlayerHUD.DrawActionBar () (at Assets/Custom Assets/Scripts/PlayerHUD.js:83)
PlayerHUD.OnGUI () (at Assets/Custom Assets/Scripts/PlayerHUD.js:56)”

also i get a warning that my array is not used, i think i am doing something wrong when it comes to assigning the element of the array to hold values dictated by the Buttons class

5

Never use the Array class, which is slow and untyped (which causes problems like you encountered). Use List instead, or built-in arrays if the size of the array doesn’t need to change.

Also, as I mentioned, it should be a class and not a struct. You have a Texture2D in there for one thing. Also there’s not really any point to the GetButton, GetSpellID, etc. functions, since the variables are all public.

–Eric

6

Sorry for the the "ActButtons = new Buttons();