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/*
* The ManaPlus Client
* Copyright (C) 2013-2014 The ManaPlus Developers
*
* This file is part of The ManaPlus Client.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "navigationmanager.h"
#include "resources/map/map.h"
#include "resources/map/metatile.h"
#include "resources/map/walklayer.h"
#include "debug.h"
static const int walkMask = (BlockMask::WALL | BlockMask::AIR
| BlockMask::WATER);
namespace
{
struct Cell final
{
Cell(const int x0, const int y0) :
x(x0),
y(y0)
{
}
int x;
int y;
};
} // namespace
NavigationManager::NavigationManager()
{
}
NavigationManager::~NavigationManager()
{
}
Resource *NavigationManager::loadWalkLayer(const Map *const map)
{
if (!map)
return nullptr;
const int width = map->getWidth();
const int height = map->getHeight();
if (width < 2 || height < 2)
return nullptr;
WalkLayer *const walkLayer = new WalkLayer(width, height);
const MetaTile *const tiles = map->getMetaTiles();
int *const data = walkLayer->getData();
int x = 0;
int y = 0;
int num = 1;
while (findWalkableTile(x, y, width, height, tiles, data))
{
fillNum(x, y, width, height, num, tiles, data);
num ++;
}
return walkLayer;
}
bool NavigationManager::findWalkableTile(int &x1, int &y1,
const int width, const int height,
const MetaTile *const tiles,
const int *const data)
{
for (int y = 0; y < height; y ++)
{
const int y2 = y * width;
for (int x = 0; x < width; x ++)
{
const int ptr = x + y2;
if (!(tiles[ptr].blockmask & walkMask) && !data[ptr])
{
x1 = x;
y1 = y;
return true;
}
}
}
return false;
}
void NavigationManager::fillNum(int x, int y,
const int width, const int height,
const int num, const MetaTile *const tiles,
int *const data)
{
std::vector<Cell> cells;
cells.push_back(Cell(x, y));
while (!cells.empty())
{
const Cell cell = cells.back();
cells.pop_back();
int ptr;
x = cell.x;
y = cell.y;
data[x + width * y] = num;
if (x > 0)
{
ptr = (x - 1) + width * y;
if (!data[ptr])
{
if (!(tiles[ptr].blockmask & walkMask))
cells.push_back(Cell(x - 1, y));
else
data[ptr] = -num;
}
}
if (x < width - 1)
{
ptr = (x + 1) + width * y;
if (!data[ptr])
{
if (!(tiles[ptr].blockmask & walkMask))
cells.push_back(Cell(x + 1, y));
else
data[ptr] = -num;
}
}
if (y > 0)
{
ptr = x + width * (y - 1);
if (!data[ptr])
{
if (!(tiles[ptr].blockmask & walkMask))
cells.push_back(Cell(x, y - 1));
else
data[ptr] = -num;
}
}
if (y < height - 1)
{
ptr = x + width * (y + 1);
if (!data[ptr])
{
if (!(tiles[ptr].blockmask & walkMask))
cells.push_back(Cell(x, y + 1));
else
data[ptr] = -num;
}
}
}
}
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