DarthMooMancer/snake
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using memmove to update snake

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DarthMooMancer
2025-10-09 11:51:21 -04:00
parent baf2e21358
commit 6c6605fcb5
4 changed files with 41 additions and 52 deletions
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include/element.hpp
+1 -1
View File
@@ -22,7 +22,7 @@ struct Point {
};
int get_score();
void determine_index_zero_pos(Point* (*board)[COL], Point** buffer);
void determine_index_zero_pos(Point** buffer);
void move_tail_indicies(Point** buffer);
void on_fruit_eaten(Point* (*board)[COL], Point** buffer);
bool segment_overlap(Point** buffer);
src/element.cpp
+30 -38
View File
@@ -1,8 +1,10 @@
#include "element.hpp"
#include <cstdlib>
#include <cstring>
#include <ctime>
int _score = 0;
int _snake_size = 3;
int get_score() {
return _score;
@@ -13,9 +15,7 @@ void Point::set_new_point(int row, int col) {
m_col = col;
}
void determine_index_zero_pos(Point* (*board)[COL], Point** buffer) {
Point new_point = { buffer[0]->m_row, buffer[0]->m_col, '.' };
void determine_index_zero_pos(Point** buffer) {
if(buffer[1] == nullptr) {
buffer[1] = new Point { buffer[0]->m_row, buffer[0]->m_col, '.' };
} else {
@@ -23,49 +23,40 @@ void determine_index_zero_pos(Point* (*board)[COL], Point** buffer) {
}
if (buffer[0]->m_dir == LEFT) {
if (new_point.m_col <= 0) new_point.m_col = COL - 1;
else new_point.m_col--;
} else if (buffer[0]->m_dir == RIGHT) {
if (new_point.m_col >= COL - 1) new_point.m_col = 0;
else new_point.m_col++;
} else if (buffer[0]->m_dir == UP) {
if (new_point.m_row <= 0) new_point.m_row = ROW - 1;
else new_point.m_row--;
} else if (buffer[0]->m_dir == DOWN) {
if (new_point.m_row >= ROW - 1) new_point.m_row = 0;
else new_point.m_row++;
if (buffer[0]->m_col <= 0) buffer[0]->m_col = COL - 1;
else buffer[0]->m_col--;
}
else if (buffer[0]->m_dir == RIGHT) {
if (buffer[0]->m_col >= COL - 1) buffer[0]->m_col = 0;
else buffer[0]->m_col++;
}
else if (buffer[0]->m_dir == UP) {
if (buffer[0]->m_row <= 0) buffer[0]->m_row = ROW - 1;
else buffer[0]->m_row--;
}
else if (buffer[0]->m_dir == DOWN) {
if (buffer[0]->m_row >= ROW - 1) buffer[0]->m_row = 0;
else buffer[0]->m_row++;
}
buffer[0]->set_new_point(new_point.m_row, new_point.m_col);
}
void move_tail_indicies(Point** buffer) {
Point* previous_head = buffer[1];
if(_snake_size <= 3) return;
int new_row = buffer[1]->m_row;
int new_col = buffer[1]->m_col;
Point* last_point = nullptr;
for(int i = (ROW * COL) - 1; i > 3; i--) {
if(buffer[i] == nullptr) {
last_point = buffer[i - 1];
continue;
}
buffer[i] = buffer[i - 1];
}
Point* last_point = buffer[_snake_size - 1];
memmove(buffer + 4, buffer + 3, (_snake_size - 4) * sizeof(Point*));
buffer[3] = last_point;
if(buffer[3] != nullptr) {
buffer[3]->set_new_point(new_row, new_col);
}
}
void _append_tail(Point *(*board)[COL], Point** buffer) {
for(int i = (ROW * COL) - 1; i >= 3; i--) {
buffer[i] = buffer[i - 1];
}
Point* old_tail = buffer[4];
if(old_tail != nullptr) {
buffer[3] = new Point { old_tail->m_row, old_tail->m_col, '@' };
} else {
buffer[3] = new Point {};
}
void _append_tail(Point** buffer) {
memmove(buffer + 4, buffer + 3, (_snake_size - 3) * sizeof(Point*));
buffer[3] = new Point { ROW, COL, '@' };
}
void on_fruit_eaten(Point* (*board)[COL], Point** buffer) {
@@ -76,15 +67,16 @@ void on_fruit_eaten(Point* (*board)[COL], Point** buffer) {
col = (rand() % COL);
} while (board[row][col] != nullptr);
buffer[2]->set_new_point(row, col);
_append_tail(board, buffer);
_append_tail(buffer);
_score++;
_snake_size++;
}
}
bool segment_overlap(Point** buffer) {
for(int i = (ROW * COL) - 1; i > 3; i--) {
if(buffer[i] == nullptr) continue;
if(buffer[i]->m_row == buffer[0]->m_row && buffer[i]->m_col == buffer[0]->m_col) {
for(int i = 0; i < _snake_size; i++) {
if(buffer[i + 3] == nullptr) continue;
if(buffer[i + 3]->m_row == buffer[0]->m_row && buffer[i + 3]->m_col == buffer[0]->m_col) {
return true;
}
}
src/main.cpp
+7 -7
View File
@@ -9,9 +9,10 @@ int main () {
std::srand(std::time(0));
Window window;
Input input;
const int MAX_LEN = (ROW * COL) + 3;
bool running = true;
Point* buffer[(ROW * COL) + 3] = {}; // 2 for head, 1 for fruit, rest for tail
Point* buffer[MAX_LEN] = {}; // 2 for head, 1 for fruit, rest for tail
buffer[0] = new Point { ROW / 2, COL / 2, '*' }; // Head
buffer[2] = new Point { (rand() % ROW), (rand() % COL), 'o' }; // Fruit
@@ -19,16 +20,16 @@ int main () {
while (running) {
on_fruit_eaten(window.m_board, buffer);
determine_index_zero_pos(window.m_board, buffer);
determine_index_zero_pos(buffer);
move_tail_indicies(buffer);
for(int i = (ROW * COL) - 1; i > 3; i--) {
for(int i = MAX_LEN - 1; i > 3; i--) {
if(buffer[i] == nullptr) break;
std::cout << "You win! Score: " << get_score() << std::endl;
std::cout << "You filled the whole board and won! Score: " << get_score() << std::endl;
running = false;
}
if(segment_overlap(buffer)) {
std::cout << "You died! Score: " << get_score() << std::endl;
std::cout << "You collided with yourself and died! Score: " << get_score() << std::endl;
running = false;
}
window.clear_display();
@@ -37,8 +38,7 @@ int main () {
}
input_thread.join();
for(int i = ((ROW * COL) + 3) - 1; i > 0; i--) {
if(buffer[i] == nullptr) continue;
for(int i = 0; i < MAX_LEN - 1; i++) {
delete buffer[i];
}
return 0;
src/window.cpp
+2 -5
View File
@@ -24,11 +24,8 @@ void Window::draw_display(int milliseconds) {
}
void Window::update_display(Point** buffer) {
m_board[buffer[0]->m_row][buffer[0]->m_col] = buffer[0];
m_board[buffer[2]->m_row][buffer[2]->m_col] = buffer[2];
for(int i = 3; i < ROW * COL; i++) {
if(buffer[i] != nullptr) {
for(int i = 0; i < ROW * COL; i++) {
if(buffer[i] == nullptr || i == 1 || buffer[i]->m_row > ROW - 1 || buffer[i]->m_col > COL - 1) continue;
m_board[buffer[i]->m_row][buffer[i]->m_col] = buffer[i];
}
}
}