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#include "Snake.h"
Snake::Snake(uint32_t headY, uint32_t headX) :direction_{LEFT} { snake_.push_back(Point{headY, headX, '>'});
for (uint32_t i = 1; i <= SNAKE_DEFAULT_SIZE; i++) { snake_.push_back(Point{headY, headX + i, SNAKE_BODY_CHAR}); } }
bool Snake::isBitten() const { const Point& head = snake_.front();
// use manual iterator loop instead of
// range-based for as we need to skip head
for (auto it = std::next(snake_.begin()); it != snake_.end(); it++) { if (it->getX() == head.getX() && it->getY() == head.getY()) { return true; } }
return false; }
bool Snake::hasBitSnack(uint32_t snackY, uint32_t snackX) const { return snake_.front().getY() == snackY && snake_.front().getX() == snackX; }
bool Snake::hasCrashedWall() const { const Point& head = snake_.front();
return (head.getY() < GAME_TOP_WALL_Y) || (head.getY() > GAME_BOTTOM_WALL_Y) || (head.getX() < GAME_LEFT_WALL_X) || (head.getX() > GAME_RIGHT_WALL_X); }
uint32_t Snake::getSize() const { return snake_.size(); }
void Snake::incSize(){ const auto tail = std::prev(snake_.end()); const uint32_t tailX = tail->getX(); const uint32_t tailY = tail->getY();
const auto prev = std::prev(tail); const uint32_t prevX = prev->getX(); const uint32_t prevY = prev->getY();
if (prevY == tailY){ // if the two last parts are on the same 'height' (horizontal tail direction)
if (prevX < tailX) { // if the tail continues to the left:
// add one part to the right of the tail
snake_.push_back(Point{tailY, tailX + 1, SNAKE_BODY_CHAR}); } else { // if the tail continues to the right:
// add one part to the left of the tail
snake_.push_back(Point{tailY, tailX - 1, SNAKE_BODY_CHAR}); } } else { // if the two last parts are on the same 'width' (vertical tail direction)
if (prevY < tailY) { // if the tail continues to the upper side:
// add one part facing down
snake_.push_back(Point{tailY + 1, tailX, SNAKE_BODY_CHAR}); } else { // if the tail continues to the lower side:
// add one part facing up
snake_.push_back(Point{tailY - 1, tailX, SNAKE_BODY_CHAR}); } } }
void Snake::updateHead(){ switch (direction_) { case UP: snake_.front().moveUp(); break;
case DOWN: snake_.front().moveDown(); break;
case LEFT: snake_.front().moveLeft(); break;
case RIGHT: snake_.front().moveRight(); break; } }
void Snake::printSnake() const { //We print each element of the snake-list
for (const Point& part : snake_){ part.print(); }
Graphics::get().refreshScreen(); }
void Snake::move() { auto head = snake_.begin(); auto second = std::next(snake_.begin());
// clear the tail - overwrites with ' '
snake_.back().clear();
// update all nodes by iterating from the back
// and copying the previous nodes values in
// until the second-to-first one
auto iter = std::prev(snake_.end()); while (iter != second) { auto prev = std::prev(iter); *iter = *prev; iter = prev; }
// update the previous to head node
// by copying from head and setting
// the image to be body instead of head
*second = *head; iter->setImg(SNAKE_BODY_CHAR);
updateHead();
printSnake(); }
void Snake::moveUp(){ snake_.front().setImg('v'); direction_ = UP; move(); }
void Snake::moveDown(){ snake_.front().setImg('^'); direction_ = DOWN; move(); }
void Snake::moveLeft(){ snake_.front().setImg('>'); direction_ = LEFT; move(); }
void Snake::moveRight(){ snake_.front().setImg('<'); direction_ = RIGHT; move(); }
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