Copying from gitlab

src/rules.cpp

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+/* ************************************************************************** */
+/*                                                                            */
+/*                                                                      / )   */
+/*   rules.cpp                                          (\__/)         ( (    */
+/*                                                      )    (          ) )   */
+/*   By: lejulien <leo.julien.42@gmail.com>           ={      }=       / /    */
+/*                                                      )     `-------/ /     */
+/*   Created: 2023/01/09 12:18:36 by lejulien          (               /      */
+/*   Updated: 2023/01/14 16:47:01 by lejulien           \              |      */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "../includes/rules.hpp"
+#include "../includes/world.hpp"
+
+// Contructor
+
+Rules::Rules() {}
+
+// Private functions
+
+void Rules::offset_coord(int &i, int &j) {
+  if (i < 0) {
+    i = this->_width - 1;
+  } else if (i >= this->_width) {
+    i = 0;
+  }
+  if (j < 0) {
+    j = this->_height - 1;
+  } else if (j >= this->_height) {
+    j = 0;
+  }
+}
+
+bool Rules::is_alive(int i, int j) {
+  offset_coord(i, j);
+  if (this->_buffer[i + j * this->_width])
+    return true;
+  return false;
+}
+
+void Rules::ortho_neighbors(int &neighbors, int i, int j) {
+  // top
+  if (is_alive(i, j - 1))
+    neighbors++;
+  // bottom
+  if (is_alive(i, j + 1))
+    neighbors++;
+  // left
+  if (is_alive(i - 1, j))
+    neighbors++;
+  // right
+  if (is_alive(i + 1, j))
+    neighbors++;
+}
+
+void Rules::diag_neighbors(int &neighbors, int i, int j) {
+  // top-left
+  if (is_alive(i - 1, j - 1))
+    neighbors++;
+  // top-right
+  if (is_alive(i + 1, j - 1))
+    neighbors++;
+  // bottom-left
+  if (is_alive(i - 1, j + 1))
+    neighbors++;
+  // bottom-right
+  if (is_alive(i + 1, j + 1))
+    neighbors++;
+}
+
+// Member function
+
+void Rules::setup(World *world) {
+  _world = world;
+  _width = world->getWidth();
+  _height = world->getHeight();
+}
+
+void Rules::newWorld(World *world) {
+  _world = world;
+  _width = world->getWidth();
+  _height = world->getHeight();
+}
+
+void Rules::update() {
+  int neighbors = 0;
+  std::vector<bool> *world_data = _world->getWorldData();
+  this->_buffer = *world_data;
+
+  // apply the rules for each cells
+  for (int j = 0; j < this->_height; j++) {
+    for (int i = 0; i < this->_width; i++) {
+      // count neighbors
+      neighbors = 0;
+      ortho_neighbors(neighbors, i, j);
+      diag_neighbors(neighbors, i, j);
+
+      // Apply the rules
+      if (neighbors < 2 || neighbors > 3)
+        (*world_data)[i + j * this->_width] = false;
+      else if (neighbors == 3)
+        (*world_data)[i + j * this->_width] = true;
+    }
+  }
+}