1 /// <summary>
2 /// 色相，饱和度，亮度转换成rgb值
3 /// </summary>
4 /// <returns></returns>
5 public static float[] HSB2RGB(float[] hsb)
6 {
7 if (hsb[0] == 360)
8 {
9 hsb[0] = 0;
10 }
11 float[] rgb = new float[3];
12 float r = 0;
13 float g = 0;
14 float b = 0;
15
16 if (hsb[1] == 0)
17 {
18 r = g = b = hsb[2];
19 }
20 else
21 {
22 float sectorPos = hsb[0] / 60f;
23 int sectorNum = (int)Math.Floor(sectorPos);
24 float fractionalSector = sectorPos - sectorNum;
25 float p = hsb[2] * (1 - hsb[1]);
26 float q = hsb[2] * (1 - (hsb[1] * fractionalSector));
27 float t = hsb[2] * (1 - (hsb[1] * (1 - fractionalSector)));
28 switch (sectorNum)
29 {
30 case 0:
31 r = hsb[2];
32 g = t;
33 b = p;
34 break;
35 case 1:
36 r = q;
37 g = hsb[2];
38 b = p;
39 break;
40 case 2:
41 r = p;
42 g = hsb[2];
43 b = t;
44 break;
45 case 3:
46 r = p;
47 g = q;
48 b = hsb[2];
49 break;
50 case 4:
51 r = t;
52 g = p;
53 b = hsb[2];
54 break;
55 case 5:
56 r = hsb[2];
57 g = p;
58 b = q;
59 break;
60 }
61
62 }
63 return new float[] { r * 255, g * 255, b * 255 };
64 }
65 /// <summary>
66 /// 将rgb类型的颜色转换为hsb
67 /// </summary>
68 /// <param name="rgb"></param>
69 /// <returns></returns>
70 public static float[] RGB2HSB(float[] rgb)
71 {
72 float[] hsb = new float[3];
73 float r = rgb[0];
74 float g = rgb[1];
75 float b = rgb[2];
76
77 float max = Math.Max(r, Math.Max(g, b));
78 if (max <= 0)
79 {
80 return hsb;
81 }
82 float min = Math.Min(r, Math.Min(g, b));
83 float dif = max - min;
84 if (max > min)
85 {
86 if (g == max)
87 {
88 hsb[0] = (b - r) / dif * 60f + 120f;
89 }
90 else if (b == max)
91 {
92 hsb[0] = (r - g) / dif * 60f + 240f;
93 }
94 else if (b > g)
95 {
96 hsb[0] = (g - b) / dif * 60f + 360f;
97 }
98 else
99 {
100 hsb[0] = (g - b) / dif * 60f;
101 }
102 if (hsb[0] < 0)
103 {
104 hsb[0] = hsb[0] + 360f;
105 }
106 }
107 else
108 {
109 hsb[0] = 0;
110 }
111 hsb[1] = dif / max;
112 hsb[2] = max / 255f;
113 return hsb;
114 }
