KnockbackPlus.cs

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

namespace Loot.Modifiers.WeaponModifiers
{
    public class KnockbackPlus : WeaponModifier
    {
        public override ModifierTooltipLine.ModifierTooltipBuilder GetTooltip()
        {
            return base.GetTooltip()
                .WithPositive($"+{Properties.RoundedPower}% knockback");
        }

        public override ModifierProperties.ModifierPropertiesBuilder GetModifierProperties(Item item)
        {
            return base.GetModifierProperties(item)
                .WithMaxMagnitude(10f);
        }

        public override bool CanRoll(ModifierContext ctx)
            => base.CanRoll(ctx) && ctx.Item.knockBack > 0;

        public override void GetWeaponKnockback(Item item, Player player, ref float knockback)
        {
            base.GetWeaponKnockback(item, player, ref knockback);
            knockback *= Properties.RoundedPower / 100f + 1;
        }
    }
}