C#•9mo ago

Trying to understand this abstract code (and use it elsewhere)

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public abstract class AbstractDungeonGenerator : MonoBehaviour
{
    [SerializeField]
    protected TilemapVisualizer tilemapVisualizer = null;
    [SerializeField]
    protected Vector2Int startPosition = Vector2Int.zero;

    public void GenerateDungeon() {
        tilemapVisualizer.Clear();
        RunProceduralGeneration();
    }

    protected abstract void RunProceduralGeneration();
}

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public abstract class AbstractDungeonGenerator : MonoBehaviour
{
    [SerializeField]
    protected TilemapVisualizer tilemapVisualizer = null;
    [SerializeField]
    protected Vector2Int startPosition = Vector2Int.zero;

    public void GenerateDungeon() {
        tilemapVisualizer.Clear();
        RunProceduralGeneration();
    }

    protected abstract void RunProceduralGeneration();
}

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using UnityEngine;
using Random = UnityEngine.Random;

public class SimpleRandomWalkDungeonGenerator : AbstractDungeonGenerator
{
    [SerializeField]
    private int iterations = 10;
    [SerializeField]
    public int walkLength = 10;
    [SerializeField]
    public bool startRandomlyEachIteration = true;

    protected override void RunProceduralGeneration()
    {
        HashSet<Vector2Int> floorPositions = RunRandomWalk();
        tilemapVisualizer.Clear();
        tilemapVisualizer.PaintFloorTiles(floorPositions);
    }

    protected HashSet<Vector2Int> RunRandomWalk()
    {
        var currentPosition = startPosition;
        HashSet<Vector2Int> floorPositions = new HashSet<Vector2Int>();
        for (int i = 0; i < iterations; i++)
        {
            var path = ProceduralGenerationAlg.SimpleRandomWalk(currentPosition, walkLength);
            floorPositions.UnionWith(path);
            if (startRandomlyEachIteration)
                currentPosition = floorPositions.ElementAt(Random.Range(0, floorPositions.Count));
        }
        return floorPositions;
    }
}

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using UnityEngine;
using Random = UnityEngine.Random;

public class SimpleRandomWalkDungeonGenerator : AbstractDungeonGenerator
{
    [SerializeField]
    private int iterations = 10;
    [SerializeField]
    public int walkLength = 10;
    [SerializeField]
    public bool startRandomlyEachIteration = true;

    protected override void RunProceduralGeneration()
    {
        HashSet<Vector2Int> floorPositions = RunRandomWalk();
        tilemapVisualizer.Clear();
        tilemapVisualizer.PaintFloorTiles(floorPositions);
    }

    protected HashSet<Vector2Int> RunRandomWalk()
    {
        var currentPosition = startPosition;
        HashSet<Vector2Int> floorPositions = new HashSet<Vector2Int>();
        for (int i = 0; i < iterations; i++)
        {
            var path = ProceduralGenerationAlg.SimpleRandomWalk(currentPosition, walkLength);
            floorPositions.UnionWith(path);
            if (startRandomlyEachIteration)
                currentPosition = floorPositions.ElementAt(Random.Range(0, floorPositions.Count));
        }
        return floorPositions;
    }
}

I am trying to get access to SimpleRandomWalkDungeonGenerator.RunProceduralGeneration from another class but I understand that it is protected. I'm not sure how get access to that function without removing abstract from AbstractDungeonGenerator (stuffs will break). Does anyone have any suggestions?

9 Replies

Angius•9mo ago

Just make it public instead of protected?

nomoney4u•9mo ago

But that introduces:

SimpleRandomWalkDungeonGenerator.RunProceduralGeneration()': cannot change access modifiers when overriding 'protected' inherited member 'AbstractDungeonGenerator.RunProceduralGeneration()'

Angius•9mo ago

Can't you make it public in the abstract class as well?

nomoney4u•9mo ago

When I did that I had to make other changes to for things to be public but then I now get this error:

NullReferenceException: Object reference not set to an instance of an object
SimpleRandomWalkDungeonGenerator.RunProceduralGeneration () (at Assets/Scripts/SimpleRandomWalkDungeonGenerator.cs:20)
PortalBehaviour.OnCollisionEnter2D 
(UnityEngine.Collision2D portal) (at Assets/Scripts/PortalBehaviour.cs:13)

NullReferenceException: Object reference not set to an instance of an object
SimpleRandomWalkDungeonGenerator.RunProceduralGeneration () (at Assets/Scripts/SimpleRandomWalkDungeonGenerator.cs:20)
PortalBehaviour.OnCollisionEnter2D 
(UnityEngine.Collision2D portal) (at Assets/Scripts/PortalBehaviour.cs:13)

Angius•9mo ago

Something you're trying to access is null

nomoney4u•9mo ago

tilemapVisualizer.Clear(); tileMapVisualizer is now null I'm guessing the protected override void RunProceduralGeneration() on that function caused the tilemapVisualizer to be null?

Angius•9mo ago

Maybe? I'd use a debugger to see when and what becomes null

nomoney4u•9mo ago

It seems that protected TilemapVisualizer tilemapVisualizer = null;, when making things abstract/protected/private, the variable tilemapVisualizer was not null, but now that I made things public, this variable is Null and is not being set like before.

Angius•9mo ago

Nullability rarely has anything to do with accessibility

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Trying to understand this abstract code (and use it elsewhere)