116 lines
2.1 KiB
Java
116 lines
2.1 KiB
Java
/*
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* Copyright (C) 2004-2015 L2J Server
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*
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* This file is part of L2J Server.
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*
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* L2J Server is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* L2J Server is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package com.l2jserver.gameserver.util;
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/**
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* @author HorridoJoho
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*/
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public final class LinePointIterator
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{
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// src is moved towards dst in next()
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private int _srcX;
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private int _srcY;
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private final int _dstX;
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private final int _dstY;
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private final long _dx;
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private final long _dy;
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private final long _sx;
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private final long _sy;
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private long _error;
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private boolean _first;
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public LinePointIterator(int srcX, int srcY, int dstX, int dstY)
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{
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_srcX = srcX;
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_srcY = srcY;
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_dstX = dstX;
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_dstY = dstY;
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_dx = Math.abs((long) dstX - srcX);
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_dy = Math.abs((long) dstY - srcY);
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_sx = srcX < dstX ? 1 : -1;
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_sy = srcY < dstY ? 1 : -1;
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if (_dx >= _dy)
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{
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_error = _dx / 2;
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}
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else
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{
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_error = _dy / 2;
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}
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_first = true;
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}
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public boolean next()
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{
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if (_first)
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{
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_first = false;
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return true;
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}
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else if (_dx >= _dy)
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{
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if (_srcX != _dstX)
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{
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_srcX += _sx;
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_error += _dy;
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if (_error >= _dx)
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{
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_srcY += _sy;
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_error -= _dx;
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}
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return true;
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}
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}
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else
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{
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if (_srcY != _dstY)
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{
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_srcY += _sy;
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_error += _dx;
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if (_error >= _dy)
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{
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_srcX += _sx;
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_error -= _dy;
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}
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return true;
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}
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}
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return false;
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}
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public int x()
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{
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return _srcX;
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}
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public int y()
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{
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return _srcY;
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}
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}
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