MLEM/MLEM.Extended/Extensions/BitmapFontExtensions.cs

using System.Collections.Generic;
using System.Text;
using Microsoft.Xna.Framework.Graphics;
using MonoGame.Extended.BitmapFonts;

namespace MLEM.Extended.Extensions {
    public static class BitmapFontExtensions {

        public static IEnumerable<string> SplitString(this BitmapFont font, string text, float width, float scale) {
            var builder = new StringBuilder();
            foreach (var word in text.Split(' ')) {
                builder.Append(word).Append(' ');
                if (font.MeasureString(builder).Width * scale >= width) {
                    var len = builder.Length - word.Length - 1;
                    yield return builder.ToString(0, len - 1);
                    builder.Remove(0, len);
                }
            }
            yield return builder.ToString(0, builder.Length - 1);
        }

    }
}