Implement

src/Tour.cpp

@@ -4,47 +4,130 @@
 // Also remove these comments here and add your own.
 // TODO: remove this comment header
 
-#include <iostream>
 #include "Tour.h"
 #include "Node.h"
 #include "Point.h"
+#include <iostream>
 
-Tour::Tour()
-{
-    // TODO: write this member
+Tour::Tour() : m_startNode(nullptr) {}
+
+Tour::~Tour() {
+    if (m_startNode == nullptr)
+        return;
+
+    Node *node = m_startNode;
+    if (node->next == m_startNode) {
+        delete node;
+        return;
+    }
+
+    do {
+        Node *next = node->next;
+        delete node;
+        node = next;
+    } while (node != m_startNode);
 }
 
-Tour::~Tour()
-{
-    // TODO: write this member
+void Tour::show() const {
+    if (m_startNode == nullptr)
+        return;
+
+    Node *node = m_startNode;
+    do {
+        Point &p = node->point;
+        // I'm not using std::endl here to avoid flushing stdout for every
+        // iteration.
+        std::cout << '(' << p.x << ", " << p.y << ")\n";
+        node = node->next;
+    } while (node != m_startNode);
+
+    // Finally, flush!
+    std::flush(std::cout);
 }
 
-void Tour::show()
-{
-    // TODO: write this member
+void Tour::draw(QGraphicsScene *scene) const {
+    if (m_startNode == nullptr)
+        return;
+
+    Node *node = m_startNode;
+    do {
+        node->point.drawTo(node->next->point, scene);
+        node = node->next;
+    } while (node != m_startNode);
 }
 
-void Tour::draw(QGraphicsScene *scene)
-{
-    // TODO: write this member
+int Tour::size() const {
+    if (m_startNode == nullptr)
+        return 0;
+
+    int count = 0;
+    Node *node = m_startNode;
+    do {
+        count++;
+        node = node->next;
+    } while (node != m_startNode);
+
+    return count;
 }
 
-int Tour::size()
-{
-    // TODO: write this member
+double Tour::distance() const {
+    if (m_startNode == nullptr)
+        return 0;
+
+    double totalDistance = 0;
+    Node *node = m_startNode;
+    do {
+        totalDistance += node->point.distanceTo(node->next->point);
+        node = node->next;
+    } while (node != m_startNode);
+
+    return totalDistance;
 }
 
-double Tour::distance()
-{
-    // TODO: write this member
+void Tour::insertNearest(Point p) {
+    if (m_startNode == nullptr) {
+        m_startNode = new Node(p);
+        return;
+    }
+
+    Node *nearest = m_startNode;
+    double minDistance = INFINITY;
+
+    Node *node = m_startNode;
+    do {
+        double currentDistance = node->point.distanceTo(p);
+        if (currentDistance < minDistance) {
+            minDistance = currentDistance;
+            nearest = node;
+        }
+        node = node->next;
+    } while (node != m_startNode);
+
+    auto *newNode = new Node(p, nearest->next);
+    nearest->next = newNode;
 }
 
-void Tour::insertNearest(Point p)
-{
-    // TODO: write this member
-}
+void Tour::insertSmallest(Point p) {
+    if (m_startNode == nullptr) {
+        m_startNode = new Node(p);
+        return;
+    }
 
-void Tour::insertSmallest(Point p)
-{
-    // TODO: write this member
+    Node *bestNode = m_startNode;
+    double minIncrease = INFINITY;
+
+    Node *node = m_startNode;
+    do {
+        double increase = node->point.distanceTo(p) +
+                          p.distanceTo(node->next->point) -
+                          node->point.distanceTo(node->next->point);
+        if (increase < minIncrease) {
+            minIncrease = increase;
+            bestNode = node;
+        }
+        node = node->next;
+    } while (node != m_startNode);
+
+    auto *newNode = new Node(p, bestNode->next);
+    bestNode->next = newNode;
 }

src/Tour.h

@@ -15,15 +15,15 @@ public:
 
     Tour();
     ~Tour();
-    void show();
-    void draw(QGraphicsScene* scene);
-    int size();
-    double distance();
+    void show() const;
+    void draw(QGraphicsScene* scene) const;
+    int size() const;
+    double distance() const;
     void insertNearest(Point p);
     void insertSmallest(Point p);
 
 private:
-
+    Node* m_startNode;
 };
 
 #endif // TOUR_H