Looping through GreyBlocks in the scene?

Help Programming
,
1

4.5.1
I want to loop through all instantiated GreyBlocks in the scene. Then be able to determine their x,y locations so I can use them in a RectsOverlap function, if there is one, for custom collision.

There is a separate object which is my character which will also be used in the collision check.

How can I do this?

Here is how I instantiate the grey blocks. They are instantiated according to what is stored in the LevelArray.

        for (int x = 0; x < 30; x++)
        {
            for (int y = 0; y < 16; y++)
            {
                if (levelArray[x, y] == 2)
                {
                    PackedScene joeScene = (PackedScene)ResourceLoader.Load("res://GameObjects/joe.tscn");
                    Joe = (Joe)joeScene.Instantiate();
                    Joe.x = x * 64f;
                    Joe.y = y * 64f;
                    Joe.Position = new Vector2((float)(Joe.x), (float)(Joe.y));
                    AddChild(Joe);
                }else if (levelArray[x, y] == 1)
                {
                    PackedScene greyBlock = (PackedScene)ResourceLoader.Load("res://GameObjects/grey_block.tscn");
                    GreyBlock gb = (GreyBlock)greyBlock.Instantiate();
                    gb.x = x * 64f;
                    gb.y = y * 64f;
                    gb.Position = new Vector2(gb.x, gb.y);
                    AddChild(gb);
                }
            }
        }
2

Store them in an array or put them into a group.

3

Hi,

You can add a list (or an array, depending on your needs, but I guess a list is more convenient to use for prototyping), and then use a foreach loop (or a for loop, it’s as you want).
Something like this:

List<GreyBlock> greyBlocks = new();
        
PackedScene greyBlockPrefab = (PackedScene)ResourceLoader.Load("res://GameObjects/grey_block.tscn");
greyBlocks.Add(greyBlockInstance);

foreach (GreyBlock greyBlock in greyBlocks) {
    // TODO: Do something on greyBlock
}
4

@normalized How do I put them in a group? Thanks.

@sixrobin That looks like it will be th ebest method. Thanks!

Can someone offer a Rects overlap function that will work between the player and the greyblocks?

5

The idea should be pretty simple: loop through the blocks, and register the furthest coordinates in all 4 directions. Once you’re done, check if your player position is contained inside these coordinates; if that’s the case, that would mean the player is inside the rect formed by the blocks.

6

Rect2 class has the overlap test method. Check the reference.

Why just not use Godot’s built in collision system? You won’t even need to iterate then, which is always preferable.

7

I’m using custom collisions as my tile collision works perfectly when I do it this way. Plus I’m converting code from GameMaker and I’m still unfamiliar with the Godot Collision system.

I’ll try the Rec2 class and report back, thanks.

8

If I want to iterate a list declared and populated in Main.cs which is attached to the Main.tscn, in a Object called Joe.tscn with a script Joe.cs how would I do that?

9

Get a reference to the node using Node::GetNode() at runtime, or assign that reference manually in the inspector to an exported property.

10

I used this but if I try to make it a field what would it be?

var _node2D = (Main)GetNode(“/root/Scenes/Main”);

As you see this is a local variable but of what type is _node2D?

11

private Main _node2D;

:slight_smile: