LightPlus.cs

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using Loot.Api.Attributes;
using Loot.Api.Core;
using Loot.Api.Delegators;
using Loot.Modifiers.Base;
using Microsoft.Xna.Framework;
using Terraria;

namespace Loot.Modifiers.EquipModifiers.Utility
{
    // Light effect, spawns a light on the player
    // This is one of the most basic modifiers with effect examples
    public class LightEffect : ModifierEffect
    {
        // Public variables that are adjustable
        public float LightStrength;
        public Color LightColor;

        // OnInitialize can initialize an effect's values
        // It is called when a player initializes its effects
        public override void OnInitialize()
        {
            // Setting Strength is not really needed, as the default
            // value for floats is already 0f. Just for clarity's sake.
            LightStrength = 0f;
            LightColor = Color.White;
        }

        // ResetEffects is called automatically if the effect is being delegated
        // This is used to reset variables like you are used to in ModPlayer
        public override void ResetEffects()
        {
            LightStrength = 0f;
            LightColor = Color.White;
        }

        public override void Clone(ref ModifierEffect clone)
        {
            // For clarity, additional cloning is possible like this
            ((LightEffect) clone).LightStrength = LightStrength;
            ((LightEffect) clone).LightColor = LightColor;
        }

        // This method will be delegated to PostUpdate
        // Meaning that this code is automatically called
        // on ModifierPlayer's PostUpdate hook if this effect
        // is being delegated
        [AutoDelegation("OnPostUpdate")]
        private void Light()
        {
            Lighting.AddLight(player.Center, LightColor.ToVector3() * .15f * LightStrength);
        }
    }

    // The UsesEffect attribute is linking this Modifier
    // to the LightEffect effect.
    // This will make the LightEffect become activated
    // if we have an item with this modifier.
    [UsesEffect(typeof(LightEffect))]
    public class LightPlus : EquipModifier
    {
        public override ModifierTooltipLine.ModifierTooltipBuilder GetTooltip()
        {
            return base.GetTooltip()
                .WithPositive($"+{Properties.RoundedPower} light");
        }

        public override ModifierProperties.ModifierPropertiesBuilder GetModifierProperties(Item item)
        {
            return base.GetModifierProperties(item)
                .WithMaxMagnitude(2f);
        }

        public override void UpdateEquip(Item item, Player player)
        {
            ModifierDelegatorPlayer.GetPlayer(player).GetEffect<LightEffect>().LightStrength += (int) Properties.RoundedPower;
        }
    }
}