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/* $Id$ */

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/** @file ai_tilelist.cpp handles all functions of the AITileList class */

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#include "ai_tilelist.hpp"

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#include "../../landscape.h"

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void AITileList::FixRectangleSpan(TileIndex &t1, TileIndex &t2)

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{

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	uint x1 = ::TileX(t1);

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	uint x2 = ::TileX(t2);

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	uint y1 = ::TileY(t1);

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	uint y2 = ::TileY(t2);

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	if (x1 >= x2) ::Swap(x1, x2);

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	if (y1 >= y2) ::Swap(y1, y2);

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	t1 = ::TileXY(x1, y1);

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	t2 = ::TileXY(x2, y2);

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}

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void AITileList::AddRectangle(TileIndex t1, TileIndex t2)

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{

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	if (!IsValidTile(t1) || !IsValidTile(t2)) return;

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	this->FixRectangleSpan(t1, t2);

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	uint w = TileX(t2) - TileX(t1) + 1;

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	uint h = TileY(t2) - TileY(t1) + 1;

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	BEGIN_TILE_LOOP(t, w, h, t1) {

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		this->AddItem(t);

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	} END_TILE_LOOP(t, w, h, t1)

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}

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void AITileList::AddTile(TileIndex tile)

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{

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	if (!IsValidTile(tile)) return;

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	this->AddItem(tile);

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}

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void AITileList::RemoveRectangle(TileIndex t1, TileIndex t2)

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{

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	if (!IsValidTile(t1) || !IsValidTile(t2)) return;

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	this->FixRectangleSpan(t1, t2);

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	uint w = TileX(t2) - TileX(t1) + 1;

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	uint h = TileY(t2) - TileY(t1) + 1;

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	BEGIN_TILE_LOOP(t, w, h, t1) {

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		this->RemoveItem(t);

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	} END_TILE_LOOP(t, w, h, t1)

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}

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void AITileList::RemoveTile(TileIndex tile)

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{

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	if (!IsValidTile(tile)) return;

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	this->RemoveItem(tile);

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}