58 lines
1.0 KiB
C++
58 lines
1.0 KiB
C++
// ==============================================================
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// This file is part of Glest (www.glest.org)
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//
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// Copyright (C) 2009-2010 James McCulloch
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//
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// You can redistribute this code and/or modify it under
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// the terms of the GNU General Public License as published
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// by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version
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// ==============================================================
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#include "pos_iterator.h"
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#include "leak_dumper.h"
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namespace Glest { namespace Util {
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Vec2i PerimeterIterator::next() {
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Vec2i n(cx, cy);
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switch (state) {
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case 0: // top edge, left->right
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if (cx == ex) {
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state = 1;
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++cy;
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} else {
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++cx;
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}
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break;
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case 1: // right edge, top->bottom
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if (cy == sy) {
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state = 2;
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--cx;
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} else {
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++cy;
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}
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break;
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case 2:
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if (cx == wx) {
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state = 3;
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--cy;
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} else {
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--cx;
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}
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break;
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case 3:
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if (cy == ny + 1) {
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state = 4;
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} else {
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--cy;
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}
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break;
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}
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return n;
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}
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}}//end namespace
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