添加了轨道类

src/railsModel.cpp

@@ -0,0 +1,77 @@
+//
+// Created by ricardo on 2022/6/10.
+//
+
+#include "railsModel.h"
+
+RailsModel::RailsModel(int distance, int node_number)
+{
+    rail_node_t *head;
+    rail_node_t *node;
+
+    head = (rail_node_t *) malloc(sizeof(rail_node_t));
+    head->id = 1;
+    head->last_node_distance = distance;
+    head->next_node_distance = distance;
+
+    node = head;
+    // 循环创建每一个节点
+    for(int i = 2; i <= node_number; i++)
+    {
+        auto *p = (rail_node_t*) malloc(sizeof (rail_node_t));
+
+        p->id = i;
+        p->last_node_distance = distance;
+        p->next_node_distance = distance;
+        p->last_node = node;
+        node->next_node = p;
+        node = p;
+    }
+
+    // 将链表头尾链接起来
+    node->next_node = head;
+    head->last_node = node;
+
+    rails = head;
+}
+
+RailsModel::~RailsModel()
+{
+    rail_node_t *node = rails;
+
+    // 断开头尾节点
+    node->last_node->next_node = nullptr;
+
+    while (node != nullptr)
+    {
+        rail_node_t *p = node;
+        node = node->next_node;
+        free(p);
+    }
+
+    // 将指针置为空
+    rails = nullptr;
+}
+
+rail_node_t *RailsModel::FindNode(int node_num) const
+{
+    if (rails == nullptr)
+    {
+        return nullptr;
+    }
+
+    rail_node_t *result = nullptr;
+    rail_node_t *node = rails;
+
+    do
+    {
+        if(node->id == node_num)
+        {
+            result = node;
+            break;
+        }
+        node = node->next_node;
+    } while (node != rails);
+
+    return result;
+}