mcs/class/System.Drawing/System.Drawing.Drawing2D/Blend.cs

   1 //\r
   2 // System.Drawing.Drawing2D.Blend.cs\r
   3 //\r
   4 // Author:\r
   5 //   Dennis Hayes (dennish@Raytek.com)\r
   6 //\r
   7 // (C) 2002/3 Ximian, Inc\r
   8 //\r
   9 using System;\r
  10 \r
  11 namespace System.Drawing.Drawing2D\r
  12 {\r
  13         /// <summary>\r
  14         /// Summary description for Blend.\r
  15         /// </summary>\r
  16         public sealed class Blend\r
  17         {\r
  18                 private int count;\r
  19                 private float [] positions;\r
  20                 private float [] factors;\r
  21                 public Blend(int count) {\r
  22                         this.count = count;\r
  23                         if(count < 2){\r
  24                                 throw new ArgumentOutOfRangeException("Count", count, "Must be at least 2");\r
  25                         }\r
  26                         if(count == 2){\r
  27                                 //FIXME: call Blend!\r
  28                                 count = 2;\r
  29                                 positions = new float [1];\r
  30                                 factors = new float [1];\r
  31                                 positions[0] = 0.0F;\r
  32                                 positions[1] = 1.0F;\r
  33                                 factors[0] = 0.0F;\r
  34                                 factors[1] = 1.0F;\r
  35                         }\r
  36                         int i;\r
  37                         for(i = 0; i < count; i++){\r
  38                                 positions[i] = (1.0F/count) * i;\r
  39                                 factors[i] = (1.0F/count) * i;\r
  40                         }\r
  41                         //fix any rounding errors that would generate an invald list.\r
  42                         positions[0] = 0.0F;\r
  43                         positions[1] = 1.0F;\r
  44                         factors[0] = 0.0F;\r
  45                         factors[1] = 1.0F;\r
  46 \r
  47                 }\r
  48                 public Blend() {\r
  49                         count = 2;\r
  50                         positions = new float [1];\r
  51                         factors = new float [1];\r
  52                         positions[0] = 0.0F;\r
  53                         positions[1] = 1.0F;\r
  54                         factors[0] = 0.0F;\r
  55                         factors[1] = 1.0F;\r
  56                 }\r
  57                 public float [] Factors{\r
  58                         get {\r
  59                                 return factors;\r
  60                         }\r
  61                         set{\r
  62                                 count = value.GetUpperBound(0) + 1;\r
  63                                 if((value[0] !=0) | (value[count-1] != 1.0F)){\r
  64                                         throw new ArgumentException(" First value must be 0.0, last value must be 1.0","Factors");\r
  65                                 }\r
  66                                 factors = value;\r
  67                         }\r
  68                 }\r
  69                 public float [] Positions{\r
  70                         get {\r
  71                                 return Positions;\r
  72                         }\r
  73                         set{\r
  74                                 count = value.GetUpperBound(0) + 1;\r
  75                                 if((value[0] !=0) | (value[count-1] != 1.0F)){\r
  76                                         throw new ArgumentException(" First value must be 0.0, last value must be 1.0","Positon");\r
  77                                 }\r
  78                                 positions = value;\r
  79                                 \r
  80                         }\r
  81                 }\r
  82         }\r
  83 }\r