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

   1 //\r
   2 // System.Drawing.Drawing2D.ColorBlend.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         public sealed class ColorBlend {\r
  14                 private int count;\r
  15                 private float [] positions;\r
  16                 private Color [] colors;\r
  17 \r
  18                 public ColorBlend(int count) {\r
  19                         //FIXME: \r
  20                         if(count < 2){\r
  21                                 throw new ArgumentOutOfRangeException("Count", count, "Must be at least 2");\r
  22                         }\r
  23                         if(count == 2){\r
  24                                 //FIXME: call ColorBlend!\r
  25                                 count = 2;\r
  26                                 positions = new float [1];\r
  27                                 colors = new Color [1];\r
  28                                 positions[0] = 0.0F;\r
  29                                 positions[1] = 1.0F;\r
  30                                 colors[0] = Color.FromArgb(0,0,0);\r
  31                                 colors[1] = Color.FromArgb(255,255,255);\r
  32                         }\r
  33                         this.count = count;\r
  34                         int i;\r
  35                         for(i = 0; i < count; i++){\r
  36                                 positions[i] = (1.0F/count) * i;\r
  37                                 //FIXME: Do real default color blend\r
  38                                 //FIXME: I used 254 to prevent overflow, should use 255, if anyone cares?\r
  39                                 colors[i] = Color.FromArgb((1/count) * i * 254,(1/count) * i * 254,(1/count) * i * 254);\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                         colors[0] = Color.FromArgb(0,0,0);\r
  45                         colors[1] = Color.FromArgb(255,255,255);\r
  46 \r
  47                 }\r
  48 \r
  49                 public ColorBlend() {\r
  50                         count = 2;\r
  51                         positions = new float [1];\r
  52                         colors = new Color [1];\r
  53                         positions[0] = 0.0F;\r
  54                         positions[1] = 1.0F;\r
  55                         colors[0] = Color.FromArgb(0,0,0);\r
  56                         colors[1] = Color.FromArgb(255,255,255);\r
  57                 }\r
  58 \r
  59                 public Color [] Colors{\r
  60                         get {\r
  61                                 return colors;\r
  62                         }\r
  63                         set{\r
  64                                 count = value.GetUpperBound(0) + 1;\r
  65                                 colors = value;\r
  66                         }\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                                 positions = value;                              \r
  76                         }\r
  77                 }\r
  78         }\r
  79 \r
  80 }\r