Transpiled version (2763L) is out of date.
1 | // start from center |
2 | static ItIt<Pt> pixelSpiral(int w, int h) {
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3 | ret pixelSpiral(w/2, h/2, w, h); |
4 | } |
5 | |
6 | // thanks to https://stackoverflow.com/questions/398299/looping-in-a-spiral |
7 | static ItIt<Pt> pixelSpiral(int sx, int sy, int imageWidth, int imageHeight, int maxPixels default Int.MAX_VALUE) {
|
8 | ret iff_endOnNull(new F0<Pt> {
|
9 | int x, y, dx, dy = -1; |
10 | int maxPixels2 = min(maxPixels, sqr(max4(sx+1, imageWidth-sx, sy+1, imageHeight-sy)*2)); |
11 | int i; |
12 | |
13 | Pt get() {
|
14 | while (i++ < maxPixels2) {
|
15 | int px = sx+x, py = sy+y; |
16 | |
17 | if (x == y |
18 | || x < 0 && x == -y |
19 | || x > 0 && x == 1-y) {
|
20 | int t=dx; dx=-dy; dy=t; |
21 | } |
22 | x += dx; y += dy; |
23 | |
24 | if (px >= 0 && py >= 0 && px < imageWidth && py < imageHeight) |
25 | ret pt(px, py); |
26 | } |
27 | null; |
28 | } |
29 | }); |
30 | } |
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| Snippet ID: | #1025244 |
| Snippet name: | pixelSpiral |
| Eternal ID of this version: | #1025244/10 |
| Text MD5: | 08a02ee11e9c109ad0ad0c955c0a5e6d |
| Author: | stefan |
| Category: | javax |
| Type: | JavaX fragment (include) |
| Public (visible to everyone): | Yes |
| Archived (hidden from active list): | No |
| Created/modified: | 2022-03-16 17:39:10 |
| Source code size: | 867 bytes / 30 lines |
| Pitched / IR pitched: | No / No |
| Views / Downloads: | 259 / 423 |
| Version history: | 9 change(s) |
| Referenced in: | [show references] |