透明度百分比和十六進位制對應關係表格

透明度百分比和十六進位制對應關係計算方法

    @Test
    public void rgba() throws Exception {
        System.out.println("透明度 | 十六進位制");
        System.out.println("---- | ----");
        for (double i = 1; i >= 0; i -= 0.01) {
            i = Math.round(i * 100) / 100.0d;
            int alpha = (int) Math.round(i * 255);
            String hex = Integer.toHexString(alpha).toUpperCase();
            if (hex.length() == 1) hex = "0" + hex;
            int percent = (int) (i * 100);
            System.out.println(String.format("%d%% | %s", percent, hex));
        }
    }

執行結果如下所示：

透明度 | 十六進位制
---- | ----
100% | FF
99% | FC
98% | FA
97% | F7
96% | F5
95% | F2
94% | F0
93% | ED
92% | EB
91% | E8
90% | E6
89% | E3
88% | E0
87% | DE
86% | DB
85% | D9
84% | D6
83% | D4
82% | D1
81% | CF
80% | CC
79% | C9
78% | C7
77% | C4
76% | C2
75% | BF
74% | BD
73% | BA
72% | B8
71% | B5
70% | B3
69% | B0
68% | AD
67% | AB
66% | A8
65% | A6
64% | A3
63% | A1
62% | 9E
61% | 9C
60% | 99
59% | 96
57% | 94
56% | 91
56% | 8F
55% | 8C
54% | 8A
53% | 87
52% | 85
51% | 82
50% | 80
49% | 7D
48% | 7A
47% | 78
46% | 75
45% | 73
44% | 70
43% | 6E
42% | 6B
41% | 69
40% | 66
39% | 63
38% | 61
37% | 5E
36% | 5C
35% | 59
34% | 57
33% | 54
32% | 52
31% | 4F
30% | 4D
28% | 4A
28% | 47
27% | 45
26% | 42
25% | 40
24% | 3D
23% | 3B
22% | 38
21% | 36
20% | 33
19% | 30
18% | 2E
17% | 2B
16% | 29
15% | 26
14% | 24
13% | 21
12% | 1F
11% | 1C
10% | 1A
9% | 17
8% | 14
7% | 12
6% | 0F
5% | 0D
4% | 0A
3% | 08
2% | 05
1% | 03
0% | 00