mcs/class/System.Drawing/System.Drawing/ColorTranslator.cs

   1 //\r
   2 // System.Drawing.ColorTranslator.cs\r
   3 //\r
   4 // (C) 2001 Ximian, Inc.  http://www.ximian.com\r
   5 //\r
   6 // Dennis Hayes (dennish@raytek.com)\r
   7 // Inital Implimentation 3/25/2002\r
   8 // All conversions based on best guess, will improve over time\r
   9 // \r
  10 using System;\r
  11 namespace System.Drawing {\r
  12         public class ColorTranslator{\r
  13                 // From converisons\r
  14                 /// <summary>\r
  15                 /// \r
  16                 /// </summary>\r
  17                 /// <param name="HtmlFromColor"></param>\r
  18                 /// <returns></returns>\r
  19                 public static Color FromHtml(string HtmlFromColor){\r
  20                         // If first char is "#"\r
  21                                 //convert "#RRGGBB" to int and use Color.FromARGB(int) to create color\r
  22                         // else //it is a color name\r
  23                         //If there is a single digit at the end of the name, remove it.\r
  24                         // Call Color.FromKnownColor(HtmlFromColor)  \r
  25 \r
  26                         //At least some Html strings match .NET Colors,\r
  27                         // so this should work for those colors.\r
  28                         // .NET colors, XWindows colors, and WWWC web colors \r
  29                         // are (according to Charles Pretziod) base the same\r
  30                         //colors, so many shouold work if any do.\r
  31                         if (HtmlFromColor[0] != '#')\r
  32                         {\r
  33                                 int length = HtmlFromColor.Length;\r
  34                                 for (int i = length - 1; i >= 0; i--)\r
  35                                 {\r
  36                                         if (!Char.IsDigit (HtmlFromColor[i]))\r
  37                                                 break;\r
  38                                         length--;\r
  39                                 }\r
  40                                 \r
  41                                 return Color.FromName(HtmlFromColor.Substring (0, length));\r
  42                         }\r
  43                         \r
  44                         int pos = 0, index = 0;\r
  45                         int[] rgb = new int[] {0, 0, 0};\r
  46                         \r
  47                         string specifier = HtmlFromColor.Substring (1).ToLower ();\r
  48                         if (specifier.Length != 6)\r
  49                                 return Color.Empty;\r
  50                                 \r
  51                         foreach (char c in specifier)\r
  52                         {\r
  53                                 rgb[index] *= 16;\r
  54 \r
  55                                 if (Char.IsDigit (c))\r
  56                                         rgb[index] += Int32.Parse (c.ToString ());\r
  57                                 else if (c <= 'f' && c >= 'a')\r
  58                                         rgb[index] += 10 + (c - 'a');\r
  59                                 else\r
  60                                         return Color.Empty;\r
  61                                 \r
  62                                 pos++;\r
  63                                 if ((pos % 2) == 0)\r
  64                                         index++;\r
  65                         }\r
  66 \r
  67                         return Color.FromArgb (rgb[0], rgb[1], rgb[2]);\r
  68                 }\r
  69                 \r
  70                 /// <summary>\r
  71                 /// \r
  72                 /// </summary>\r
  73                 /// <param name="OLEFromColor"></param>\r
  74                 /// <returns></returns>\r
  75                 public static Color FromOle(int OLEFromColor){\r
  76                         //int newcolor;\r
  77                         //TODO: swap RB bytes i.e. AARRGGBB to AABBGGRR\r
  78                         //return Color.FromArgb(newcolor);\r
  79                         return Color.Empty;\r
  80                 }\r
  81                 \r
  82                 /// <summary>\r
  83                 /// \r
  84                 /// </summary>\r
  85                 /// <param name="Win32FromColor"></param>\r
  86                 /// <returns></returns>\r
  87                 public static Color FromWin32(int Win32FromColor){\r
  88                         //int newcolor;\r
  89                         //TODO: swap RB bytes i.e. AARRGGBB to AABBGGRR\r
  90                         //return Color.FromArgb(newcolor);\r
  91                         return Color.Empty;\r
  92                 }\r
  93 \r
  94                 // To conversions\r
  95                 public static string ToHtml (Color c)\r
  96                 {\r
  97                         if (c.IsEmpty)\r
  98                                 return "";\r
  99 \r
 100                         string result;\r
 101 \r
 102                         if (c.IsNamedColor)\r
 103                                 result = c.Name;\r
 104                         else\r
 105                                 result = String.Format ("#{0:X2}{1:X2}{2:X2}", c.R, c.G, c.B);\r
 106 \r
 107                         return result;\r
 108                 }\r
 109                 /// <summary>\r
 110                 /// converts from BGR to RGB\r
 111                 /// </summary>\r
 112                 /// <param name="OleToColor"></param>\r
 113                 /// <returns></returns>\r
 114                 public static int ToOle(Color FromColor){\r
 115                         // TODO: Swap red and blue(from argb), convert to int(toargb)\r
 116                         // Same as ToWin32\r
 117                         return (Color.FromArgb(FromColor.B,FromColor.G,FromColor.R)).ToArgb();\r
 118                 }\r
 119 \r
 120                 /// <summary>\r
 121                 /// converts from RGB to BGR\r
 122                 /// </summary>\r
 123                 /// <param name="Win32ToColor"></param>\r
 124                 /// <returns></returns>\r
 125                 public static int ToWin32(Color FromColor){\r
 126                         // TODO: Swap red and blue(from argb), convert to int(toargb)\r
 127                         // Same as ToOle\r
 128                         return (Color.FromArgb(FromColor.B,FromColor.G,FromColor.R)).ToArgb();\r
 129                 }\r
 130         }\r
 131 }\r
 132 \r
 133 \r
 134 \r
 135 \r