WorldUIAnchor.cs

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using System;
using Microsoft.Xna.Framework;
 
namespace Terraria.GameContent.UI;
 
public class WorldUIAnchor
{
    public enum AnchorType
    {
        Entity,
        Tile,
        Pos,
        None
    }
 
    public AnchorType type;
 
    public Entity entity;
 
    public Vector2 pos = Vector2.Zero;
 
    public Vector2 size = Vector2.Zero;
 
    public WorldUIAnchor()
    {
        type = AnchorType.None;
    }
 
    public WorldUIAnchor(Entity anchor)
    {
        type = AnchorType.Entity;
        entity = anchor;
    }
 
    public WorldUIAnchor(Vector2 anchor)
    {
        type = AnchorType.Pos;
        pos = anchor;
    }
 
    public WorldUIAnchor(int topLeftX, int topLeftY, int width, int height)
    {
        type = AnchorType.Tile;
        pos = new Vector2((float)topLeftX + (float)width / 2f, (float)topLeftY + (float)height / 2f) * 16f;
        size = new Vector2(width, height) * 16f;
    }
 
    public bool InRange(Vector2 target, float tileRangeX, float tileRangeY)
    {
        switch (type)
        {
        case AnchorType.Entity:
            if (Math.Abs(target.X - entity.Center.X) <= tileRangeX * 16f + (float)entity.width / 2f)
            {
                return Math.Abs(target.Y - entity.Center.Y) <= tileRangeY * 16f + (float)entity.height / 2f;
            }
            return false;
        case AnchorType.Pos:
            if (Math.Abs(target.X - pos.X) <= tileRangeX * 16f)
            {
                return Math.Abs(target.Y - pos.Y) <= tileRangeY * 16f;
            }
            return false;
        case AnchorType.Tile:
            if (Math.Abs(target.X - pos.X) <= tileRangeX * 16f + size.X / 2f)
            {
                return Math.Abs(target.Y - pos.Y) <= tileRangeY * 16f + size.Y / 2f;
            }
            return false;
        default:
            return true;
        }
    }
}