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ICSharpCode.TextEditor/Project/Src/Document/HighlightingStrategy/FontContainer.cs

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+// <file>
+//     <copyright see="prj:///doc/copyright.txt"/>
+//     <license see="prj:///doc/license.txt"/>
+//     <owner name="Mike Krüger" email="mike@icsharpcode.net"/>
+//     <version>$Revision$</version>
+// </file>
+
+using System;
+using System.Drawing;
+
+namespace ICSharpCode.TextEditor.Document
+{
+	/// <summary>
+	/// This class is used to generate bold, italic and bold/italic fonts out
+	/// of a base font.
+	/// </summary>
+	public class FontContainer
+	{
+		Font defaultFont;
+		Font regularfont, boldfont, italicfont, bolditalicfont;
+		
+		/// <value>
+		/// The scaled, regular version of the base font
+		/// </value>
+		public Font RegularFont {
+			get {
+				return regularfont;
+			}
+		}
+		
+		/// <value>
+		/// The scaled, bold version of the base font
+		/// </value>
+		public Font BoldFont {
+			get {
+				return boldfont;
+			}
+		}
+		
+		/// <value>
+		/// The scaled, italic version of the base font
+		/// </value>
+		public Font ItalicFont {
+			get {
+				return italicfont;
+			}
+		}
+		
+		/// <value>
+		/// The scaled, bold/italic version of the base font
+		/// </value>
+		public Font BoldItalicFont {
+			get {
+				return bolditalicfont;
+			}
+		}
+		
+		static float twipsPerPixelY;
+		
+		public static float TwipsPerPixelY {
+			get {
+				if (twipsPerPixelY == 0) {
+					using (Bitmap bmp = new Bitmap(1,1)) {
+						using (Graphics g = Graphics.FromImage(bmp)) {
+							twipsPerPixelY = 1440 / g.DpiY;
+						}
+					}
+				}
+				return twipsPerPixelY;
+			}
+		}
+		
+		/// <value>
+		/// The base font
+		/// </value>
+		public Font DefaultFont {
+			get {
+				return defaultFont;
+			}
+			set {
+				// 1440 twips is one inch
+				float pixelSize = (float)Math.Round(value.SizeInPoints * 20 / TwipsPerPixelY);
+				
+				defaultFont    = value;
+				regularfont    = new Font(value.FontFamily, pixelSize * TwipsPerPixelY / 20f, FontStyle.Regular);
+				boldfont       = new Font(regularfont, FontStyle.Bold);
+				italicfont     = new Font(regularfont, FontStyle.Italic);
+				bolditalicfont = new Font(regularfont, FontStyle.Bold | FontStyle.Italic);
+			}
+		}
+		
+		public static Font ParseFont(string font)
+		{
+			string[] descr = font.Split(new char[]{',', '='});
+			return new Font(descr[1], float.Parse(descr[3]));
+		}
+		
+		public FontContainer(Font defaultFont)
+		{
+			this.DefaultFont = defaultFont;
+		}
+	}
+}