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scope regionBorder_innerPoints. static Pt[] #directions = { pt(1, 0), pt(0, 1), pt(-1, 0), pt(0, -1) // r, d, l, u }; static L regionBorder_innerPoints(BWImage_FastRegions regions, int iRegion) { new PtBuffer out; Pt p = regions.samplePixel(iRegion); int x = p.x, y = p.y; // move up until we're at the edge of the region // probably we don't actually need to do this because of the way // the image was scanned, but we'll do it anyway while (y > 0 && regions.inRegion(iRegion, x, y-1)) y--; // found our first border pixel with background above int dir = 3; // direction up // remember first point int firstX = x, firstY = y; int safety = regions.size(); while (x != firstX && y != firstY && --safety >= 0) { out.add(x, y); int turn = 3; while (turn <= 6) { // try left, straight, right, back int newDir = (dir+turn) & 3; Pt d = directions[newDir]; int x2 = x+d.x; y2 = y+d.y; if (regions.inRegion(x2, y2)) { x = x2; y = y2; dir = newDir; break; } } // if we get here, the region is just 1 pixel (so we're done) break; } ret out; }