Trianta/snakeplusplus
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Added better algorithm for snake AI #1

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Trianta merged 3 commits from dev into master 2023-10-13 19:37:10 -05:00
Conversation 0 Commits 3 Files Changed 5 +72 -19
3 changed files with 72 additions and 19 deletions
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83
src/botinterface.cpp
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@ -38,25 +38,42 @@ namespace snakeplusplus
// Gets a new path for the bot to follow // Gets a new path for the bot to follow
// Uses DFS algorithm // Uses DFS algorithm
void AISnake::GetNewPath(const std::vector< std::vector<char> >& gameBoard, const sf::Vector2f& source, const sf::Vector2f& boundaries) void AISnake::GetNewPath(const std::vector< std::vector<char> >& gameBoard, const sf::Vector2f& source, const sf::Vector2f& boundaries, const int snakeSize)
{ {
// Search for food
if (snakeSize < 160) {
BFS(gameBoard, source, boundaries);
} else {
DFS(gameBoard, source, boundaries);
}
// Create path for food
path.push(botPathUnsanitized.top());
botPathUnsanitized.pop();
while (!botPathUnsanitized.empty()) {
sf::Vector2f deltaVector = botPathUnsanitized.top() - path.top();
int delta = abs(deltaVector.x) + abs(deltaVector.y);
if (delta == 1) {
path.push(botPathUnsanitized.top());
}
botPathUnsanitized.pop();
}
}
void AISnake::BFS(const std::vector< std::vector<char> >& gameBoard, const sf::Vector2f& source, const sf::Vector2f& boundaries) {
std::queue<sf::Vector2f> search; std::queue<sf::Vector2f> search;
std::stack<sf::Vector2f> botPathUnsanitized;
std::vector<std::vector<bool>> visited(boundaries.y, std::vector<bool> (boundaries.x, false)); std::vector<std::vector<bool>> visited(boundaries.y, std::vector<bool> (boundaries.x, false));
sf::Vector2f currentLocation;
std::array<sf::Vector2f, 4> localLocations;
bool foodFound = false; bool foodFound = false;
search.push(source); search.push(source);
// Search for food
while (!search.empty()) { while (!search.empty()) {
currentLocation = search.front(); sf::Vector2f currentLocation = search.front();
search.pop(); search.pop();
if (foodFound) { break; } if (foodFound) { break; }
if (visited.at(currentLocation.y).at(currentLocation.x)) { continue; } if (visited.at(currentLocation.y).at(currentLocation.x)) { continue; }
botPathUnsanitized.push(currentLocation);
if (gameBoard.at(currentLocation.y).at(currentLocation.x) == 'X') { if (gameBoard.at(currentLocation.y).at(currentLocation.x) == 'X') {
foodFound = true; foodFound = true;
} }
botPathUnsanitized.push(currentLocation);
std::array<sf::Vector2f, 4> localLocations;
localLocations.fill(currentLocation); localLocations.fill(currentLocation);
localLocations[0].y += 1; localLocations[0].y += 1;
localLocations[1].x += 1; localLocations[1].x += 1;
@ -84,17 +101,49 @@ namespace snakeplusplus
} }
visited.at(currentLocation.y).at(currentLocation.x) = true; visited.at(currentLocation.y).at(currentLocation.x) = true;
} }
// Create path for food
path.push(botPathUnsanitized.top());
botPathUnsanitized.pop();
while (!botPathUnsanitized.empty()) {
currentLocation = botPathUnsanitized.top();
sf::Vector2f deltaVector = currentLocation - path.top();
int delta = abs(deltaVector.x) + abs(deltaVector.y);
if (delta == 1) {
path.push(botPathUnsanitized.top());
} }
botPathUnsanitized.pop();
void AISnake::DFS(const std::vector< std::vector<char> >& gameBoard, const sf::Vector2f& source, const sf::Vector2f& boundaries) {
std::stack<sf::Vector2f> search;
std::vector<std::vector<bool>> visited(boundaries.y, std::vector<bool> (boundaries.x, false));
bool foodFound = false;
search.push(source);
while (!search.empty()) {
sf::Vector2f currentLocation = search.top();
search.pop();
if (foodFound) { break; }
if (visited.at(currentLocation.y).at(currentLocation.x)) { continue; }
if (gameBoard.at(currentLocation.y).at(currentLocation.x) == 'X') {
foodFound = true;
}
botPathUnsanitized.push(currentLocation);
std::array<sf::Vector2f, 4> localLocations;
localLocations.fill(currentLocation);
localLocations[0].y += 1;
localLocations[1].x += 1;
localLocations[2].y -= 1;
localLocations[3].x -= 1;
for (auto i : localLocations) {
try {
if (gameBoard.at(i.y).at(i.x) == 'X') {
botPathUnsanitized.push(i);
foodFound = true;
}
} catch (const std::out_of_range& error) {
continue; // Out of bounds
}
}
for (sf::Vector2f newLocation : localLocations) {
try {
if ((!visited.at(newLocation.y).at(newLocation.x))
&& (gameBoard.at(newLocation.y).at(newLocation.x) == ' ')) {
search.push(newLocation);
}
} catch (const std::out_of_range& error) {
continue; // Out of bounds
}
}
visited.at(currentLocation.y).at(currentLocation.x) = true;
} }
} }
} }

6
src/botinterface.hpp
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@ -12,8 +12,12 @@ namespace snakeplusplus
public: public:
std::stack<sf::Vector2f> path; std::stack<sf::Vector2f> path;
AISnake(); AISnake();
void GetNewPath(const std::vector< std::vector<char> >& gameBoard, const sf::Vector2f& source, const sf::Vector2f& boundaries); void GetNewPath(const std::vector< std::vector<char> >& gameBoard, const sf::Vector2f& source, const sf::Vector2f& boundaries, const int snakeSize);
PlayerDirection GetInput(const sf::Vector2f* source); PlayerDirection GetInput(const sf::Vector2f* source);
private:
std::stack<sf::Vector2f> botPathUnsanitized;
void BFS(const std::vector< std::vector<char> >& gameBoard, const sf::Vector2f& source, const sf::Vector2f& boundaries);
void DFS(const std::vector< std::vector<char> >& gameBoard, const sf::Vector2f& source, const sf::Vector2f& boundaries);
}; };
} }

2
src/gamestate.cpp
View File

@ -121,7 +121,7 @@ namespace snakeplusplus
PlayerDirection controller; PlayerDirection controller;
if (isBotControlled) { if (isBotControlled) {
if (bot.path.empty()) { if (bot.path.empty()) {
bot.GetNewPath(gameBoard, player.headLocation, GetGameBoundaries()); bot.GetNewPath(gameBoard, player.headLocation, GetGameBoundaries(), player.body.size());
} }
controller = bot.GetInput(&player.headLocation); controller = bot.GetInput(&player.headLocation);
} }