Pacman/Grid.cpp at master · AndrejSolaja/Pacman · GitHub

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#include "Grid.hpp"
#include <iostream>
#include <queue>
#include <unordered_set>

Grid::Grid(std::vector<std::string> gridLayout) : gridBackground(ResourceManager::instance().getTexture("resources/sprites.png"))
{
	rowCnt = gridLayout.size();
	colCnt = gridLayout[0].size();

	if (rowCnt != GRID_ROW_COUNT || colCnt != GRID_COL_COUNT) {
		std::cout << "ERROR: Wrong grid dimensions" << std::endl;
		std::exit(1);
	}

	grid = std::vector<std::vector<Tile>>(31, std::vector<Tile>(28, Tile()));

	for (int i = 0; i < rowCnt; i++) {
		for (int j = 0; j < colCnt; j++) {
			auto tileType = TileType::LEGAL;
			auto foodType = FoodType::NONE;
			if (gridLayout[i][j] == 'X')
				tileType = TileType::WALL;
			if (gridLayout[i][j] == 'O')
				tileType = TileType::GHOST_START;
			if (gridLayout[i][j] == '.')
				foodType = FoodType::BASIC;
			if (gridLayout[i][j] == '@')
				foodType = FoodType::BIG;

			Tile tile = Tile(
				i,
				j,
				sf::Vector2f(
					static_cast<float>(j * TILE_SIZE),
					static_cast<float>(GRID_TOP_OFFSET * TILE_SIZE + i * TILE_SIZE)
				),
				sf::Vector2f(
					static_cast<float>(TILE_SIZE),
					static_cast<float>(TILE_SIZE)
				),
				tileType,
				foodType
			);
			grid[i][j] = tile;
		}
	}
	gridBackground.setTextureRect(sf::IntRect({ 228, 0 }, { 224, 248 }));
	gridBackground.setPosition({ 0.f, TILE_SIZE * GRID_TOP_OFFSET * 1.f });
	gridBackground.setScale({ SCALE * 1.f, SCALE * 1.f });

}

bool Grid::isShapeInTile(const sf::Shape& shape, const Tile& tile)
{
	sf::FloatRect bounds = shape.getGlobalBounds();
	sf::Vector2f shapeCenter = sf::Vector2f(bounds.position.x + bounds.size.x / 2.f, bounds.position.y + bounds.size.y / 2.f);
	return tile.getRectangle().getGlobalBounds().contains(shapeCenter);
}

bool Grid::isShapeInTile(const sf::Sprite& shape, const Tile& tile)
{
	sf::FloatRect bounds = shape.getGlobalBounds();
	sf::Vector2f shapeCenter = sf::Vector2f(bounds.position.x + bounds.size.x / 2.f, bounds.position.y + bounds.size.y / 2.f);
	return tile.getRectangle().getGlobalBounds().contains(shapeCenter);
}

void Grid::render(sf::RenderWindow& window, bool showGrid) {
	window.draw(gridBackground);
	for (int i = 0; i < rowCnt; i++) {
		for (int j = 0; j < colCnt; j++) {
			if (grid[i][j].hasFood())
				window.draw(grid[i][j].getFoodSprite());
			if(showGrid)
				window.draw(grid[i][j].getRectangle());
		}
	}

}

Tile* Grid::nextTile(Tile* srcTile, DirectionEnum direction)
{
	int currentCol = srcTile->getCol();
	int currentRow = srcTile->getRow();
	int newCol = 0, newRow = 0;
	switch (direction) {
	case DirectionEnum::NONE:
		return srcTile;
		break;
	case DirectionEnum::UP:
		newCol = currentCol;
		newRow = currentRow - 1;
		break;
	case DirectionEnum::DOWN:
		newCol = currentCol;
		newRow = currentRow + 1;
		break;
	case DirectionEnum::LEFT:
		newCol = currentCol - 1;
		newRow = currentRow;
		break;
	case DirectionEnum::RIGHT:
		newCol = currentCol + 1;
		newRow = currentRow;
		break;
	}

	newCol = ((newCol % colCnt) + colCnt) % colCnt;
	newRow = ((newRow % rowCnt) + rowCnt) % rowCnt;

	return &grid[newRow][newCol];

}

float Grid::tileDistance(Tile* tile1, Tile* tile2, Tile* currentTile)
{
	std::unordered_set<Tile*> visited;
	std::vector<DirectionEnum> allDirections = { DirectionEnum::UP, DirectionEnum::DOWN, DirectionEnum::LEFT, DirectionEnum::RIGHT };
	int distance = 0;

	std::queue<Tile*> que;
	que.push(tile1);

	// Add this tile since ghost can't go backwards
	visited.insert(currentTile);

	while (!que.empty()) {
		int n = que.size();
		for (int i = 0; i < n; i++) {
			Tile* curr = que.front();
			que.pop();

			visited.insert(curr);

			for (auto x : allDirections) {
				Tile* nextTile = this->nextTile(curr, x);
				if (nextTile->isLegal() && visited.count(nextTile) == 0) {
					que.push(nextTile);
				}
			}

			// Found it
			if (curr == tile2) {
				return distance;
			}

		}
		distance++;


	}
	// In case target is in wall, calculate eucilidan distance instead
	if (distance == 0) {
		float x1 = tile1->getRow(), x2 = tile2->getRow(), y1 = tile1->getCol(), y2 = tile2->getCol();
		distance = std::sqrt((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1));
	}

	return distance;

}