Commit | Line | Data |
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242486dc TW |
1 | package kaka.cakelight; |
2 | ||
3 | public class Color { | |
38c759f8 TW |
4 | private static int[] gammaCorrection = new int[256]; |
5 | ||
6 | public static void calculateGammaCorrection(double gamma) { | |
7 | for (int i = 0, max = 255; i <= max; i++) { | |
8 | gammaCorrection[i] = (int)(Math.pow((double)i / max, gamma) * max); | |
9 | } | |
10 | } | |
11 | ||
242486dc TW |
12 | private int r, g, b; |
13 | ||
8aea44b5 TW |
14 | public static Color rgb(double r, double g, double b) { |
15 | return rgb((int)(255 * r), (int)(255 * g), (int)(255 * b)); | |
16 | } | |
17 | ||
242486dc TW |
18 | public static Color rgb(int r, int g, int b) { |
19 | Color c = new Color(); | |
20 | c.r = r; | |
21 | c.g = g; | |
22 | c.b = b; | |
23 | return c; | |
24 | } | |
25 | ||
b3e10312 TW |
26 | /** |
27 | * @param hue 0.0 - 1.0 | |
28 | * @param saturation 0.0 - 1.0 | |
29 | * @param value 0.0 - 1.0 | |
30 | */ | |
65af4342 TW |
31 | public static Color hsv(double hue, double saturation, double value) { |
32 | double normalizedHue = hue - Math.floor(hue); | |
33 | int h = (int)(normalizedHue * 6); | |
34 | double f = normalizedHue * 6 - h; | |
35 | double p = value * (1 - saturation); | |
36 | double q = value * (1 - f * saturation); | |
37 | double t = value * (1 - (1 - f) * saturation); | |
38 | ||
39 | switch (h) { | |
40 | case 0: return rgb(value, t, p); | |
41 | case 1: return rgb(q, value, p); | |
42 | case 2: return rgb(p, value, t); | |
43 | case 3: return rgb(p, q, value); | |
44 | case 4: return rgb(t, p, value); | |
45 | case 5: return rgb(value, p, q); | |
46 | default: throw new RuntimeException("Something went wrong when converting from HSV to RGB. Input was " + hue + ", " + saturation + ", " + value); | |
47 | } | |
48 | } | |
49 | ||
b3e10312 TW |
50 | public double[] toHSV() { |
51 | return toHSV(r / 255.0, g / 255.0, b / 255.0); | |
52 | } | |
53 | ||
54 | /** | |
55 | * @return an array with hsv values ranging from 0.0 to 1.0 | |
56 | */ | |
57 | public static double[] toHSV(double r, double g, double b) { | |
58 | double h, s, v; | |
59 | double min = Math.min(Math.min(r, g), b); | |
60 | double max = Math.max(Math.max(r, g), b); | |
61 | ||
62 | if (max == 0) { | |
63 | return new double[] {0, 0, 0}; | |
64 | } | |
65 | ||
66 | // Value | |
67 | v = max; | |
68 | ||
69 | // Saturation | |
70 | double delta = max - min; | |
71 | s = delta / max; | |
72 | ||
73 | // Hue | |
74 | if (r == max) { | |
75 | h = (g - b) / delta; // between yellow & magenta | |
76 | } else if (g == max) { | |
77 | h = 2 + (b - r) / delta; // between cyan & yellow | |
78 | } else { | |
79 | h = 4 + (r - g) / delta; // between magenta & cyan | |
80 | } | |
81 | ||
82 | h /= 6.0; | |
83 | if (h < 0) | |
84 | h += 1; | |
85 | ||
86 | return new double[] {h, s, v}; | |
87 | } | |
88 | ||
242486dc | 89 | public int r() { |
38c759f8 | 90 | return gammaCorrection[r]; |
242486dc TW |
91 | } |
92 | ||
93 | public int g() { | |
38c759f8 | 94 | return gammaCorrection[g]; |
242486dc TW |
95 | } |
96 | ||
97 | public int b() { | |
38c759f8 | 98 | return gammaCorrection[b]; |
242486dc TW |
99 | } |
100 | ||
101 | public Color interpolate(Color other, double value) { | |
102 | double invertedValue = 1 - value; | |
103 | return Color.rgb( | |
104 | (int)(r * invertedValue + other.r * value), | |
105 | (int)(g * invertedValue + other.g * value), | |
106 | (int)(b * invertedValue + other.b * value) | |
107 | ); | |
108 | } | |
109 | } |