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// both the outer outline and the outline of a hole are called a "trace" // should return outer outline first and then outline of holes srecord noeq RegionBorder_innerPoints(BWImage_FastRegions regions, int iRegion) is Steppable { event newTrace; event traceDone; event foundPoint(Pt p); int w, x, y, dir; BWImage_FastRegions.RegionIterator it; BitSet seen; bool tracing; static Pt[] #directions = { pt(1, 0), pt(0, 1), pt(-1, 0), pt(0, -1) // r, d, l, u }; void init { w = regions.w; seen = new BitSet; it = regions.regionIterator(iRegion); } public bool step() { if (seen == null) init(); if (tracing) { int pos = y*w+x; if (seen.get(pos)) { traceDone(); tracing = false; true; } seen.set(pos); foundPoint(x, y); for (int turn = 3; turn <= 6; turn++) { // 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(iRegion, x2, y2)) { x = x2; y = y2; dir = newDir; true; } } true; // i think this ends the trace in next iteration } else { // search for border pixel if (!it.next()) false; // done x = it.x(); y = it.y(); // not a border pixel? continue search for border pixel if (regions.inRegion(iRegion, x, y-1) && regions.inRegion(iRegion, x-1, y) && regions.inRegion(iRegion, x+1, y) && regions.inRegion(iRegion, x, y+1)) true; //print("border pixel: " + x + "/" + y); dir = 3; // start with direction up (any direction should do) set tracing; newTrace(); true; } } void foundPoint(int x, int y) { foundPoint(pt(x, y)); } }