CommonBossBigProgressBar.cs

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using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
 
namespace Terraria.GameContent.UI.BigProgressBar;
 
public class CommonBossBigProgressBar : IBigProgressBar
{
    private BigProgressBarCache _cache;
 
    private int _headIndex;
 
    public bool ValidateAndCollectNecessaryInfo(ref BigProgressBarInfo info)
    {
        if (info.npcIndexToAimAt < 0 || info.npcIndexToAimAt > 200)
        {
            return false;
        }
        NPC nPC = Main.npc[info.npcIndexToAimAt];
        if (!nPC.active)
        {
            return false;
        }
        int bossHeadTextureIndex = nPC.GetBossHeadTextureIndex();
        if (bossHeadTextureIndex == -1)
        {
            return false;
        }
        _cache.SetLife(nPC.life, nPC.lifeMax);
        _headIndex = bossHeadTextureIndex;
        return true;
    }
 
    public void Draw(ref BigProgressBarInfo info, SpriteBatch spriteBatch)
    {
        Texture2D value = TextureAssets.NpcHeadBoss[_headIndex].Value;
        Rectangle barIconFrame = value.Frame();
        BigProgressBarHelper.DrawFancyBar(spriteBatch, _cache.LifeCurrent, _cache.LifeMax, value, barIconFrame);
    }
}