Star.cs

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using System;
using Microsoft.Xna.Framework;
using Terraria.Utilities;
 
namespace Terraria;
 
public class Star
{
    public Vector2 position;
 
    public float scale;
 
    public float rotation;
 
    public int type;
 
    public float twinkle;
 
    public float twinkleSpeed;
 
    public float rotationSpeed;
 
    public bool falling;
 
    public bool hidden;
 
    public Vector2 fallSpeed;
 
    public int fallTime;
 
    public static bool dayCheck = false;
 
    public static float starfallBoost = 1f;
 
    public static int starFallCount = 0;
 
    public float fadeIn;
 
    public static void NightSetup()
    {
        starfallBoost = 1f;
        int maxValue = 10;
        int maxValue2 = 3;
        if (Main.tenthAnniversaryWorld)
        {
            maxValue = 5;
            maxValue2 = 2;
        }
        if (Main.rand.Next(maxValue) == 0)
        {
            starfallBoost = (float)Main.rand.Next(300, 501) * 0.01f;
        }
        else if (Main.rand.Next(maxValue2) == 0)
        {
            starfallBoost = (float)Main.rand.Next(100, 151) * 0.01f;
        }
        starFallCount = 0;
    }
 
    public static void StarFall(float positionX)
    {
        starFallCount++;
        int num = -1;
        float num2 = -1f;
        float num3 = positionX / Main.rightWorld * 1920f;
        for (int i = 0; i < Main.numStars; i++)
        {
            if (!Main.star[i].hidden && !Main.star[i].falling)
            {
                float num4 = Math.Abs(Main.star[i].position.X - num3);
                if (num2 == -1f || num4 < num2)
                {
                    num = i;
                    num2 = num4;
                }
            }
        }
        if (num >= 0)
        {
            Main.star[num].Fall();
        }
    }
 
    public static void SpawnStars(int s = -1)
    {
        FastRandom fastRandom = FastRandom.CreateWithRandomSeed();
        int num = fastRandom.Next(200, 400);
        int num2 = 0;
        int num3 = num;
        if (s >= 0)
        {
            num2 = s;
            num3 = s + 1;
        }
        for (int i = num2; i < num3; i++)
        {
            Main.star[i] = new Star();
            if (s >= 0)
            {
                Main.star[i].fadeIn = 1f;
                int num4 = 10;
                int num5 = -2000;
                for (int j = 0; j < num4; j++)
                {
                    float num6 = fastRandom.Next(1921);
                    int num7 = 2000;
                    for (int k = 0; k < Main.numStars; k++)
                    {
                        if (k != s && !Main.star[k].hidden && !Main.star[k].falling)
                        {
                            int num8 = (int)Math.Abs(num6 - Main.star[k].position.X);
                            if (num8 < num7)
                            {
                                num7 = num8;
                            }
                        }
                    }
                    if (s == 0 || num7 > num5)
                    {
                        num5 = num7;
                        Main.star[i].position.X = num6;
                    }
                }
            }
            else
            {
                Main.star[i].position.X = fastRandom.Next(1921);
            }
            Main.star[i].position.Y = fastRandom.Next(1201);
            Main.star[i].rotation = (float)fastRandom.Next(628) * 0.01f;
            Main.star[i].scale = (float)fastRandom.Next(70, 130) * 0.006f;
            Main.star[i].type = fastRandom.Next(0, 4);
            Main.star[i].twinkle = (float)fastRandom.Next(60, 101) * 0.01f;
            Main.star[i].twinkleSpeed = (float)fastRandom.Next(30, 110) * 0.0001f;
            if (fastRandom.Next(2) == 0)
            {
                Main.star[i].twinkleSpeed *= -1f;
            }
            Main.star[i].rotationSpeed = (float)fastRandom.Next(5, 50) * 0.0001f;
            if (fastRandom.Next(2) == 0)
            {
                Main.star[i].rotationSpeed *= -1f;
            }
            if (fastRandom.Next(40) == 0)
            {
                Main.star[i].scale *= 2f;
                Main.star[i].twinkleSpeed /= 2f;
                Main.star[i].rotationSpeed /= 2f;
            }
        }
        if (s == -1)
        {
            Main.numStars = num;
        }
    }
 
    public void Fall()
    {
        fallTime = 0;
        falling = true;
        fallSpeed.Y = (float)Main.rand.Next(700, 1001) * 0.01f;
        fallSpeed.X = (float)Main.rand.Next(-400, 401) * 0.01f;
    }
 
    public void Update()
    {
        if (falling && !hidden)
        {
            fallTime += Main.dayRate;
            position += fallSpeed * (Main.dayRate + 99) / 100f;
            if (position.Y > 1500f)
            {
                hidden = true;
            }
            if (Main.starGame && position.Length() > 99999f)
            {
                hidden = true;
            }
            twinkle += twinkleSpeed * 3f;
            if (twinkle > 1f)
            {
                twinkle = 1f;
                twinkleSpeed *= -1f;
            }
            else if ((double)twinkle < 0.6)
            {
                twinkle = 0.6f;
                twinkleSpeed *= -1f;
            }
            rotation += 0.5f;
            if ((double)rotation > 6.28)
            {
                rotation -= 6.28f;
            }
            if (rotation < 0f)
            {
                rotation += 6.28f;
            }
            return;
        }
        if (fadeIn > 0f)
        {
            float num = 6.1728395E-05f * (float)Main.dayRate;
            num *= 10f;
            fadeIn -= num;
            if (fadeIn < 0f)
            {
                fadeIn = 0f;
            }
        }
        twinkle += twinkleSpeed;
        if (twinkle > 1f)
        {
            twinkle = 1f;
            twinkleSpeed *= -1f;
        }
        else if ((double)twinkle < 0.6)
        {
            twinkle = 0.6f;
            twinkleSpeed *= -1f;
        }
        rotation += rotationSpeed;
        if ((double)rotation > 6.28)
        {
            rotation -= 6.28f;
        }
        if (rotation < 0f)
        {
            rotation += 6.28f;
        }
    }
 
    public static void UpdateStars()
    {
        if (!Main.dayTime)
        {
            dayCheck = false;
        }
        else if (!dayCheck && Main.time >= 27000.0)
        {
            for (int i = 0; i < Main.numStars; i++)
            {
                if (Main.star[i].hidden)
                {
                    SpawnStars(i);
                }
            }
        }
        for (int j = 0; j < Main.numStars; j++)
        {
            Main.star[j].Update();
        }
    }
}