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#region License/* FNA - XNA4 Reimplementation for Desktop Platforms * Copyright 2009-2016 Ethan Lee and the MonoGame Team * * Released under the Microsoft Public License. * See LICENSE for details. */#endregion#region Using Statementsusing System;using System.Collections.Generic;using System.Collections.ObjectModel;using System.Text;#endregionnamespace Microsoft.Xna.Framework.Graphics{ public sealed class SpriteFont { #region Public Properties public ReadOnlyCollection<char> Characters { get; private set; } public char? DefaultCharacter { get; set; } public int LineSpacing { get; set; } public float Spacing { get; set; } #endregion #region Internal Variables /* I've had a bunch of games use reflection on SpriteFont to get * this data. Keep these names as they are for XNA4 accuracy! * -flibit */ internal Texture2D textureValue; internal List<Rectangle> glyphData; internal List<Rectangle> croppingData; internal List<Vector3> kerning; internal List<char> characterMap; #endregion #region Internal Constructor internal SpriteFont( Texture2D texture, List<Rectangle> glyphBounds, List<Rectangle> cropping, List<char> characters, int lineSpacing, float spacing, List<Vector3> kerningData, char? defaultCharacter ) { Characters = new ReadOnlyCollection<char>(characters.ToArray()); DefaultCharacter = defaultCharacter; LineSpacing = lineSpacing; Spacing = spacing; textureValue = texture; glyphData = glyphBounds; croppingData = cropping; kerning = kerningData; characterMap = characters; } #endregion #region Public MeasureString Methods public Vector2 MeasureString(string text) { /* FIXME: This method is a duplicate of MeasureString(StringBuilder)! * The only difference is how we iterate through the string. * -flibit */ if (text == null) { throw new ArgumentNullException("text"); } if (text.Length == 0) { return Vector2.Zero; } // FIXME: This needs an accuracy check! -flibit Vector2 result = Vector2.Zero; float curLineWidth = 0.0f; float finalLineHeight = LineSpacing; bool firstInLine = true; foreach (char c in text) { // Special characters if (c == '\r') { continue; } if (c == '\n') { result.X = Math.Max(result.X, curLineWidth); result.Y += LineSpacing; curLineWidth = 0.0f; finalLineHeight = LineSpacing; firstInLine = true; continue; } /* Get the List index from the character map, defaulting to the * DefaultCharacter if it's set. */ int index = characterMap.IndexOf(c); if (index == -1) { if (!DefaultCharacter.HasValue) { throw new ArgumentException( "Text contains characters that cannot be" + " resolved by this SpriteFont.", "text" ); } index = characterMap.IndexOf(DefaultCharacter.Value); } /* For the first character in a line, always push the width * rightward, even if the kerning pushes the character to the * left. */ if (firstInLine) { curLineWidth += Math.Abs(kerning[index].X); firstInLine = false; } else { curLineWidth += Spacing + kerning[index].X; } /* Add the character width and right-side bearing to the line * width. */ curLineWidth += kerning[index].Y + kerning[index].Z; /* If a character is taller than the default line height, * increase the height to that of the line's tallest character. */ if (croppingData[index].Height > finalLineHeight) { finalLineHeight = croppingData[index].Height; } } // Calculate the final width/height of the text box result.X = Math.Max(result.X, curLineWidth); result.Y += finalLineHeight; return result; } public Vector2 MeasureString(StringBuilder text) { /* FIXME: This method is a duplicate of MeasureString(string)! * The only difference is how we iterate through the StringBuilder. * We don't use ToString() since it generates garbage. * -flibit */ if (text == null) { throw new ArgumentNullException("text"); } if (text.Length == 0) { return Vector2.Zero; } // FIXME: This needs an accuracy check! -flibit Vector2 result = Vector2.Zero; float curLineWidth = 0.0f; float finalLineHeight = LineSpacing; bool firstInLine = true; for (int i = 0; i < text.Length; i += 1) { char c = text[i]; // Special characters if (c == '\r') { continue; } if (c == '\n') { result.X = Math.Max(result.X, curLineWidth); result.Y += LineSpacing; curLineWidth = 0.0f; finalLineHeight = LineSpacing; firstInLine = true; continue; } /* Get the List index from the character map, defaulting to the * DefaultCharacter if it's set. */ int index = characterMap.IndexOf(c); if (index == -1) { if (!DefaultCharacter.HasValue) { throw new ArgumentException( "Text contains characters that cannot be" + " resolved by this SpriteFont.", "text" ); } index = characterMap.IndexOf(DefaultCharacter.Value); } /* For the first character in a line, always push the width * rightward, even if the kerning pushes the character to the * left. */ if (firstInLine) { curLineWidth += Math.Abs(kerning[index].X); firstInLine = false; } else { curLineWidth += Spacing + kerning[index].X; } /* Add the character width and right-side bearing to the line * width. */ curLineWidth += kerning[index].Y + kerning[index].Z; /* If a character is taller than the default line height, * increase the height to that of the line's tallest character. */ if (croppingData[index].Height > finalLineHeight) { finalLineHeight = croppingData[index].Height; } } // Calculate the final width/height of the text box result.X = Math.Max(result.X, curLineWidth); result.Y += finalLineHeight; return result; } #endregion }} |
