Transpiled version (8993L) is out of date.
1 | srecord noeq G22RegionThinner(IImageRegion<?> originalRegion) is Steppable {
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2 | Rect bounds; |
3 | |
4 | // true = part of region |
5 | // index is in bounds coordinates |
6 | bool[] pixels; |
7 | |
8 | gettable IImageRegion region = new {
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9 | public Rect bounds() { ret bounds; }
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10 | |
11 | public bool contains(int x, int y) {
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12 | ret containsPt(bounds, x, y) && pixels[idx(x, y)]; |
13 | } |
14 | |
15 | public ItIt<Pt> pixelIterator() {
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16 | ret iff_null(new IF0<Pt> {
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17 | int idx = 0; |
18 | |
19 | public Pt get() {
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20 | for (; idx < pixels.length; idx++) |
21 | if (pixels[idx]) |
22 | ret idxToPt(idx++); |
23 | null; |
24 | } |
25 | }); |
26 | } |
27 | }; |
28 | |
29 | int idx(int x, int y) {
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30 | ret (y-bounds.y)*bounds.w+x-bounds.x; |
31 | } |
32 | |
33 | Pt idxToPt(int idx) {
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34 | ret pt(bounds.x+(idx % bounds.w), bounds.y+idx/bounds.w); |
35 | } |
36 | |
37 | void init {
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38 | if (bounds != null) ret; |
39 | bounds = originalRegion.bounds(); |
40 | pixels = new bool[area(bounds)]; |
41 | for (Pt p : originalRegion.pixelIterator()) |
42 | pixels[idx(p.x, p.y)] = true; |
43 | } |
44 | |
45 | bool change; |
46 | |
47 | public bool step() {
|
48 | init(); |
49 | |
50 | change = false; |
51 | |
52 | L<PtBuffer> traces = g22_allBorderTraces_withDiagonals(region); |
53 | |
54 | for (points : traces) {
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55 | if (eq(first(points), last(points))) removeLast(points); |
56 | |
57 | for i over points: {
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58 | ping(); |
59 | if (deletableBorderPoint(points, i)) {
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60 | Pt p = points.get(i); |
61 | pixels[idx(p.x, p.y)] = false; |
62 | set change; |
63 | } |
64 | } |
65 | points.clear(); |
66 | } |
67 | |
68 | ret change; |
69 | } |
70 | |
71 | bool deletableBorderPoint(PtBuffer points, int i) {
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72 | L<Pt> range = cyclicSubList(points, i-1, i+2); |
73 | Pt lastPoint = cyclicGet(points, i-1); |
74 | Pt p = points.get(i); |
75 | Pt diff = ptDiff(p, lastPoint); |
76 | Pt l = ptPlus(p, rotatePtLeft(diff)); |
77 | Pt r = ptPlus(p, rotatePtRight(diff)); |
78 | bool deletable = !range.contains(l) && region.contains(l) |
79 | || !range.contains(r) && region.contains(r); |
80 | printVars ifdef G22RegionThinner_debug(+range, +p, +l, +r, +deletable); |
81 | ret deletable; |
82 | } |
83 | |
84 | bool deletableBorderPoint_v1(PtBuffer points, int i) {
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85 | L<Pt> range = cyclicSubList(points, i-1, i+2); |
86 | Pt p = points.get(i); |
87 | |
88 | // check all 8 points around border point |
89 | for (int dir = 1; dir <= 8; dir++) {
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90 | Pt p2 = ptPlus(p, onePathDirection(dir)); |
91 | |
92 | // If neighboring point is in region but not in current border, |
93 | // it makes the border point deletable |
94 | |
95 | if (region.contains(p2.x, p2.y) |
96 | && !range.contains(p2)) {
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97 | printVars ifdef G22RegionThinner_debug("deletable point", +p, +dir, +p2, +range);
|
98 | ret true; |
99 | } |
100 | } |
101 | |
102 | false; |
103 | } |
104 | |
105 | IImageRegion get() { ret region; }
|
106 | } |
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| Snippet ID: | #1034965 |
| Snippet name: | G22RegionThinner - thin a region [abandoned, replaced by G22RegionThinner_v2] |
| Eternal ID of this version: | #1034965/22 |
| Text MD5: | 6c348b0fa62b2d5cf3e1a7e59656be20 |
| Author: | stefan |
| Category: | javax |
| Type: | JavaX fragment (include) |
| Public (visible to everyone): | Yes |
| Archived (hidden from active list): | No |
| Created/modified: | 2022-03-21 22:54:50 |
| Source code size: | 2816 bytes / 106 lines |
| Pitched / IR pitched: | No / No |
| Views / Downloads: | 97 / 200 |
| Version history: | 21 change(s) |
| Referenced in: | [show references] |