TeleportHelpers.cs

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using Microsoft.Xna.Framework;
 
namespace Terraria.GameContent;
 
public class TeleportHelpers
{
    public static bool RequestMagicConchTeleportPosition(Player player, int crawlOffsetX, int startX, out Point landingPoint)
    {
        landingPoint = default(Point);
        Point point = new Point(startX, 50);
        int num = 1;
        int num2 = -1;
        int num3 = 1;
        int num4 = 0;
        int num5 = 5000;
        Vector2 vector = new Vector2((float)player.width * 0.5f, player.height);
        int num6 = 40;
        bool flag = WorldGen.SolidOrSlopedTile(Main.tile[point.X, point.Y]);
        int num7 = 0;
        int num8 = 400;
        while (num4 < num5 && num7 < num8)
        {
            num4++;
            Tile tile = Main.tile[point.X, point.Y];
            Tile tile2 = Main.tile[point.X, point.Y + num3];
            bool flag2 = WorldGen.SolidOrSlopedTile(tile) || tile.liquid > 0;
            bool flag3 = WorldGen.SolidOrSlopedTile(tile2) || tile2.liquid > 0;
            if (IsInSolidTilesExtended(new Vector2(point.X * 16 + 8, point.Y * 16 + 15) - vector, player.velocity, player.width, player.height, (int)player.gravDir))
            {
                if (flag)
                {
                    point.Y += num;
                }
                else
                {
                    point.Y += num2;
                }
                continue;
            }
            if (flag2)
            {
                if (flag)
                {
                    point.Y += num;
                }
                else
                {
                    point.Y += num2;
                }
                continue;
            }
            flag = false;
            if (!IsInSolidTilesExtended(new Vector2(point.X * 16 + 8, point.Y * 16 + 15 + 16) - vector, player.velocity, player.width, player.height, (int)player.gravDir) && !flag3 && (double)point.Y < Main.worldSurface)
            {
                point.Y += num;
                continue;
            }
            if (tile2.liquid > 0)
            {
                point.X += crawlOffsetX;
                num7++;
                continue;
            }
            if (TileIsDangerous(point.X, point.Y))
            {
                point.X += crawlOffsetX;
                num7++;
                continue;
            }
            if (TileIsDangerous(point.X, point.Y + num3))
            {
                point.X += crawlOffsetX;
                num7++;
                continue;
            }
            if (point.Y >= num6)
            {
                break;
            }
            point.Y += num;
        }
        if (num4 == num5 || num7 >= num8)
        {
            return false;
        }
        if (!WorldGen.InWorld(point.X, point.Y, 40))
        {
            return false;
        }
        landingPoint = point;
        return true;
    }
 
    private static bool TileIsDangerous(int x, int y)
    {
        Tile tile = Main.tile[x, y];
        if (tile.liquid > 0 && tile.lava())
        {
            return true;
        }
        if (tile.wall == 87 && (double)y > Main.worldSurface && !NPC.downedPlantBoss)
        {
            return true;
        }
        if (Main.wallDungeon[tile.wall] && (double)y > Main.worldSurface && !NPC.downedBoss3)
        {
            return true;
        }
        return false;
    }
 
    private static bool IsInSolidTilesExtended(Vector2 testPosition, Vector2 playerVelocity, int width, int height, int gravDir)
    {
        if (Collision.LavaCollision(testPosition, width, height))
        {
            return true;
        }
        if (Collision.AnyHurtingTiles(testPosition, width, height))
        {
            return true;
        }
        if (Collision.SolidCollision(testPosition, width, height))
        {
            return true;
        }
        Vector2 vector = Vector2.UnitX * 16f;
        if (Collision.TileCollision(testPosition - vector, vector, width, height, fallThrough: false, fall2: false, gravDir) != vector)
        {
            return true;
        }
        vector = -Vector2.UnitX * 16f;
        if (Collision.TileCollision(testPosition - vector, vector, width, height, fallThrough: false, fall2: false, gravDir) != vector)
        {
            return true;
        }
        vector = Vector2.UnitY * 16f;
        if (Collision.TileCollision(testPosition - vector, vector, width, height, fallThrough: false, fall2: false, gravDir) != vector)
        {
            return true;
        }
        vector = -Vector2.UnitY * 16f;
        if (Collision.TileCollision(testPosition - vector, vector, width, height, fallThrough: false, fall2: false, gravDir) != vector)
        {
            return true;
        }
        return false;
    }
}