[Part 23] Implementing Experience gain modifier

[Jukers]

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In Vampire Survivors, you can modify the amount of experience your character gains in several ways. One of them is the passive item Crown, which increases experience gain by 8% per level.

For example, if you have a Crown and gain 100 experience, you’ll end up getting 108 experience points.

Here’s how to implement it!

Inside PlayerStats.cs In the IncreaseExperience function: PlayerStats.cs

public void IncreaseExperience(int amount)
    {

        experience += Mathf.RoundToInt(amount * actualStats.expGain);

        LevelUpChecker();
        UpdateExpBar();
    }

This behavior is set to round the experience gain after the multiplication, but you can adjust it as you prefer.

Inside character data add these changes:

using UnityEngine;

[CreateAssetMenu(fileName = "Character Data", menuName = "2D Top-down Rogue-like/Character Data")]
public class CharacterData : ScriptableObject
{
    [SerializeField]
    Sprite icon;
    public RuntimeAnimatorController animator;
    public Sprite Icon { get => icon; private set => icon = value; }

    [SerializeField]
    new string name;
    public string Name { get => name; private set => name = value; }

    [SerializeField]
    WeaponData startingWeapon;
    public WeaponData StartingWeapon { get => startingWeapon; private set => startingWeapon = value; }

    [System.Serializable]
    public struct Stats
    {
        public float maxHealth, recovery, armor;
        [Range(-1, 10)] public float moveSpeed, might, area;
        [Range(-1, 5)] public float speed, duration;
        [Range(-1, 10)] public int amount;
        [Range(-1, 1)] public float cooldown;
        [Range(-1, 10)] public float expGain;
        [Min(-1)] public float luck, growth, greed, curse;
        public float magnet;
        public int revival;

        public static Stats operator +(Stats s1, Stats s2)
        {
            s1.maxHealth += s2.maxHealth;
            s1.recovery += s2.recovery;
            s1.armor += s2.armor;
            s1.moveSpeed += s2.moveSpeed;
            s1.might += s2.might;
            s1.area += s2.area;
            s1.speed += s2.speed;
            s1.duration += s2.duration;
            s1.amount += s2.amount;
            s1.cooldown += s2.cooldown;
             s1.expGain += s2.expGain;
            s1.luck += s2.luck;
            s1.growth += s2.growth;
            s1.greed += s2.greed;
            s1.curse += s2.curse;
            s1.magnet += s2.magnet;
            return s1;
        }
        public static Stats operator *(Stats s1, Stats s2)
        {
            s1.maxHealth *= s2.maxHealth;
            s1.recovery *= s2.recovery;
            s1.armor *= s2.armor;
            s1.moveSpeed *= s2.moveSpeed;
            s1.might *= s2.might;
            s1.area *= s2.area;
            s1.speed *= s2.speed;
            s1.duration *= s2.duration;
            s1.amount *= s2.amount;
            s1.cooldown *= s2.cooldown;
            s1.luck *= s2.luck;
            s1.growth *= s2.growth;
            s1.greed *= s2.greed;
            s1.curse *= s2.curse;
            s1.magnet *= s2.magnet;
            return s1;
        }
    }
    public Stats stats = new Stats
    {
        maxHealth = 100, moveSpeed = 1, might = 1, amount = 0,
        area = 1, speed = 1, duration = 1, cooldown = 1, <span style="color: #32CD32;">expGain = 1,</span>
        luck = 1, greed = 1, growth = 1, curse = 1
    };
}

Now make sure to check the values in your character’s scriptable object

Finally, lets create the Crown Item Passive Data! Create a Passive Item Data, name it Crown Passive Item and then set these stats

for the other levels just copy level 2 and change the name accordingly!

• Terence

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[Terence]

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@jukers thank you for sharing this.

Instead of adding a new expGain variable, you can use the existing growth stat, which affects experience gain: https://vampire-survivors.fandom.com/wiki/Growth

This means that we use the same code that you have, except that we use growth instead of expGain.

public void IncreaseExperience(int amount)
{

    experience += Mathf.RoundToInt(amount * actualStats.growthexpGain);

    LevelUpChecker();
    UpdateExpBar();
}

Thank you for sharing this! I didn’t notice that I forgot to implement bonus experience gain.

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[Jukers]

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I completely missed that! going to update the post!

• Terence

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[Terence]

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@jukers you’re awesome my friend. Thank you for contributing to the forums.

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