1 | static RGB probeRandomPixel(RGBImage image) {
|
2 | int x = (int) (random()*(image.getWidth()-1)); |
3 | int y = (int) (random()*(image.getHeight()-1)); |
4 | return image.getPixel(x, y); |
5 | } |
6 | |
7 | static float probeRandomPixel(BWImage image) {
|
8 | int x = (int) (random()*(image.getWidth()-1)); |
9 | int y = (int) (random()*(image.getHeight()-1)); |
10 | return image.getPixel(x, y); |
11 | } |
12 | |
13 | static RGB randomColor() {
|
14 | return new RGB(random(), random(), random()); |
15 | } |
16 | |
17 | static float randomBrightness() {
|
18 | ret (float) random(); |
19 | } |
20 | |
21 | static RGBImage resizeToWidth(RGBImage image, int w) {
|
22 | return resize(image, w, (int) ((image.getHeight()*(double) w)/image.getWidth())); |
23 | } |
24 | |
25 | public static RGBImage resize(RGBImage image, int w, int h) {
|
26 | if (w == image.getWidth() && h == image.getHeight()) return image; |
27 | |
28 | int[] pixels = new int[w*h]; |
29 | for (int y = 0; y < h; y++) |
30 | for (int x = 0; x < w; x++) |
31 | pixels[y*w+x] = image.getInt(x*image.getWidth()/w, y*image.getHeight()/h); |
32 | return new RGBImage(w, h, pixels); |
33 | } |
34 | |
35 | static Random _random = new Random(); |
36 | static double random() {
|
37 | return _random.nextInt(100001)/100000.0; |
38 | } |
39 | |
40 | static int random(int max) {
|
41 | return _random.nextInt(max); |
42 | } |
43 | |
44 | static double random(double min, double max) {
|
45 | return min+random()*(max-min); |
46 | } |
47 | |
48 | static double normalize(double d) {
|
49 | return Math.max(0, Math.min(1, d)); |
50 | } |
51 | |
52 | static int round(double d) {
|
53 | return (int) Math.round(d); |
54 | } |
55 | |
56 | static double mix(double a, double b, double bishness) {
|
57 | return a+(b-a)*bishness; |
58 | } |
59 | |
60 | public static double pixelDiff(RGB a, RGB b) {
|
61 | return (Math.abs(a.r-b.r) + Math.abs(a.g-b.g) + Math.abs(a.b-b.b))/3; |
62 | } |
63 | |
64 | public static double diff(RGBImage image, RGBImage image2) {
|
65 | int w = image.getWidth(), h = image.getHeight(); |
66 | double sum = 0; |
67 | for (int y = 0; y < h; y++) |
68 | for (int x = 0; x < w; x++) |
69 | sum += pixelDiff(image.getRGB(x, y), image2.getRGB(x, y)); |
70 | return sum/(w*h); |
71 | } |
72 | |
73 | static double diff(BWImage image, BWImage image2) {
|
74 | int w = image.getWidth(), h = image.getHeight(); |
75 | double sum = 0; |
76 | for (int y = 0; y < h; y++) |
77 | for (int x = 0; x < w; x++) |
78 | sum += Math.abs(image.getPixel(x, y) - image2.getPixel(x, y)); |
79 | return sum/(w*h); |
80 | } |
81 | |
82 | public static void copy(RGBImage src, int srcX, int srcY, RGBImage dst, int dstX, int dstY, int w, int h) {
|
83 | for (int y = 0; y < h; y++) |
84 | for (int x = 0; x < w; x++) |
85 | dst.setPixel(dstX+x, dstY+y, src.getPixel(srcX+x, srcY+y)); |
86 | } |
87 | |
88 | public static void copy(BWImage src, int srcX, int srcY, BWImage dst, int dstX, int dstY, int w, int h) {
|
89 | w = min(w, dst.getWidth()-dstX); |
90 | for (int y = 0; y < h; y++) |
91 | for (int x = 0; x < w; x++) |
92 | dst.setByte(dstX+x, dstY+y, src.getByte(srcX+x, srcY+y)); |
93 | } |
94 | |
95 | static float varyChannel(float x) {
|
96 | return Math.max(0f, Math.min(1f, (float) (x+random(-0.1, 0.1)))); |
97 | } |
98 | |
99 | static double vary01(double x) {
|
100 | return Math.max(0, Math.min(1, x+random(-0.1, 0.1))); |
101 | } |
102 | |
103 | static RGB varyColor(RGB rgb) {
|
104 | int s = random(3); |
105 | if (s == 0) |
106 | return new RGB(varyChannel(rgb.r), rgb.g, rgb.b); |
107 | else if (s == 1) |
108 | return new RGB(rgb.r, varyChannel(rgb.g), rgb.b); |
109 | else |
110 | return new RGB(rgb.r, rgb.g, varyChannel(rgb.b)); |
111 | } |
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| Snippet ID: | #1000522 |
| Snippet name: | Helper functions for reproducing images |
| Eternal ID of this version: | #1000522/1 |
| Text MD5: | 0cfa8e6eb8ec0e9c8cc3bbcca9df6b95 |
| Author: | stefan |
| Category: | javax |
| Type: | JavaX fragment (include) |
| Public (visible to everyone): | Yes |
| Archived (hidden from active list): | No |
| Created/modified: | 2016-08-20 21:45:09 |
| Source code size: | 3220 bytes / 111 lines |
| Pitched / IR pitched: | No / No |
| Views / Downloads: | 709 / 4211 |
| Referenced in: | [show references] |