VelocityDamage.cs

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using System;
using Loot.Api.Core;
using Loot.Modifiers.Base;
using Terraria;

namespace Loot.Modifiers.WeaponModifiers
{
    public class VelocityDamage : WeaponModifier
    {
        public override ModifierTooltipLine.ModifierTooltipBuilder GetTooltip()
        {
            return base.GetTooltip()
                .WithPositive($"Added damage based on player's velocity (multiplier: {Math.Round(Properties.RoundedPower / 2, 1)}x)");
        }

        public override ModifierProperties.ModifierPropertiesBuilder GetModifierProperties(Item item)
        {
            return base.GetModifierProperties(item)
                .WithMaxMagnitude(2)
                .WithRoundPrecision(1);
        }

        public override void ModifyWeaponDamage(Item item, Player player, ref float add, ref float mult, ref float flat)
        {
            base.ModifyWeaponDamage(item, player, ref add, ref mult, ref flat);
            float magnitude = Properties.RoundedPower * player.velocity.Length() / 4;
            add += magnitude / 100;
        }
    }
}