AroundShaderDrawStyle.cs

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using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using Terraria;

namespace Loot.Api.Graphics.Shader.Style
{
    public sealed class AroundShaderDrawStyle : NormalShaderDrawStyle
    {
        public enum OffsetStyle
        {
            NORMAL,
            ALTERNATE
        }

        public OffsetStyle offsetStyle;

        public AroundShaderDrawStyle(OffsetStyle offsetStyle = OffsetStyle.NORMAL, ShaderDrawStyleProperties properties = null) : base(properties)
        {
            this.offsetStyle = offsetStyle;
        }

        public Vector2 GetDrawOffset(int i)
        {
            if (offsetStyle == OffsetStyle.NORMAL)
            {
                return new Vector2(0, Properties.DrawDistance).RotatedBy((float)i / Properties.NumSegments * MathHelper.TwoPi);
            }
            if (offsetStyle == OffsetStyle.ALTERNATE)
            {
                var halfDist = Properties.DrawDistance / 2;
                var offY = halfDist + halfDist * i % halfDist;
                return new Vector2(0, offY).RotatedBy((float)i / Properties.NumSegments * MathHelper.TwoPi);
            }
            return Vector2.Zero;
        }

        public override void DrawShader(SpriteBatch spriteBatch, ShaderEntity entity)
        {
            var centerPos = entity.DrawData.position;
            for (int i = 0; i < Properties.NumSegments; i++)
            {
                entity.DrawData.position = centerPos + GetDrawOffset(i);
                base.DrawShader(spriteBatch, entity);
            }
        }
    }
}