Add NPC chunk management + Generalize lerp

src/ChunkManager.cpp

@@ -56,6 +56,17 @@ void ChunkManager::removePlayer(std::pair<int, int> chunkPos, CNSocket* sock) {
     // TODO: if players and NPCs are empty, free chunk and remove it from surrounding views
 }
 
+void ChunkManager::removeNPC(std::pair<int, int> chunkPos, int32_t id) {
+    if (!checkChunk(chunkPos))
+        return; // do nothing if chunk doesn't even exist
+
+    Chunk* chunk = chunks[chunkPos];
+
+    chunk->NPCs.erase(id); // gone
+
+    // TODO: if players and NPCs are empty, free chunk and remove it from surrounding views
+}
+
 bool ChunkManager::checkChunk(std::pair<int, int> chunk) {
     return chunks.find(chunk) != chunks.end();
 }

src/ChunkManager.hpp

@@ -22,6 +22,7 @@ namespace ChunkManager {
     void addNPC(int posX, int posY, int32_t id);
     void addPlayer(int posX, int posY, CNSocket* sock);
     void removePlayer(std::pair<int, int> chunkPos, CNSocket* sock);
+    void removeNPC(std::pair<int, int> chunkPos, int32_t id);
     bool checkChunk(std::pair<int, int> chunk);
     std::pair<int, int> grabChunk(int posX, int posY);
     std::vector<Chunk*> grabChunks(std::pair<int, int> chunkPos);

src/NPCManager.cpp

@@ -121,6 +121,24 @@ void NPCManager::removeNPC(int32_t id) {
     std::cout << "npc removed!" << std::endl;
 }
 
+void NPCManager::updateNPCPosition(int32_t id, int X, int Y, int Z) {
+    BaseNPC* npc = NPCs[id];
+
+    std::pair<int, int> oldPos = ChunkManager::grabChunk(npc->appearanceData.iX, npc->appearanceData.iY);
+    npc->appearanceData.iX = X;
+    npc->appearanceData.iY = Y;
+    npc->appearanceData.iZ = Z;
+    std::pair<int, int> newPos = ChunkManager::grabChunk(X, Y);
+
+    // nothing to be done
+    if (newPos == oldPos)
+        return;
+
+    // pull NPC from old chunk and add to new chunk
+    ChunkManager::removeNPC(oldPos, npc->appearanceData.iNPC_ID);
+    ChunkManager::addNPC(X, Y, npc->appearanceData.iNPC_ID);
+}
+
 void NPCManager::npcVendorBuy(CNSocket* sock, CNPacketData* data) {
     if (data->size != sizeof(sP_CL2FE_REQ_PC_VENDOR_ITEM_BUY))
         return; // malformed packet

src/NPCManager.hpp

@@ -22,6 +22,7 @@ namespace NPCManager {
 
     void addNPC(std::vector<Chunk*> viewableChunks, int32_t);
     void removeNPC(int32_t);
+    void updateNPCPosition(int32_t, int X, int Y, int Z);
 
     void npcBarkHandler(CNSocket* sock, CNPacketData* data);
     void npcSummonHandler(CNSocket* sock, CNPacketData* data);

src/TableData.cpp

@@ -255,19 +255,7 @@ void TableData::constructPath(nlohmann::json::iterator _pathData) {
     for (_point++; _point != pathPoints.end(); _point++) {
         point = _point.value();
         WarpLocation coords = { point["iX"] , point["iY"] , point["iZ"] };
-        // Calculate distance between this point and the last
-        int dXY = hypot(last.x - coords.x, last.y - coords.y); // XY plane distance
-        int distanceBetween = hypot(dXY, last.z - coords.z); // total distance
-        int lerps = distanceBetween / (int)pathData["iMonkeySpeed"]; // integer division to ensure a whole number of in-between points
-        for (int i = 0; i < lerps; i++) {
-            WarpLocation lerp;
-            // lerp math
-            float frac = (i + 1) * 1.0f / (lerps + 1);
-            lerp.x = (last.x * (1.0f - frac)) + (coords.x * frac);
-            lerp.y = (last.y * (1.0f - frac)) + (coords.y * frac);
-            lerp.z = (last.z * (1.0f - frac)) + (coords.z * frac);
-            points.push(lerp); // add lerp'd point to the queue
-        }
+        TransportManager::lerp(&points, last, coords, pathData["iMonkeySpeed"]);
         points.push(coords); // add keyframe to the queue
         last = coords; // update start pos
     }

src/TransportManager.cpp

@@ -4,6 +4,7 @@
 #include "TransportManager.hpp"
 
 #include <unordered_map>
+#include <cmath>
 
 std::map<int32_t, TransportRoute> TransportManager::Routes;
 std::map<int32_t, TransportLocation> TransportManager::Locations;
@@ -26,6 +27,7 @@ void TransportManager::init() {
     busPoints.push(start);
     TransportManager::lerp(&busPoints, start, end, 1000);
     busPoints.push(end);
+    TransportManager::lerp(&busPoints, end, start, 1000);
     NPCQueues[bus->appearanceData.iNPC_ID] = busPoints;
 }
 
@@ -271,10 +273,9 @@ void TransportManager::stepNPCPathing() {
         int distanceBetween = hypot(dXY, point.z - npc->appearanceData.iZ); // total distance
 
         // update NPC location to update viewables
-        npc->appearanceData.iX = point.x;
-        npc->appearanceData.iY = point.y;
-        npc->appearanceData.iZ = point.z;
+        NPCManager::updateNPCPosition(npc->appearanceData.iNPC_ID, point.x, point.y, point.z);
 
+        // get chunks in view
         auto chunk = ChunkManager::grabChunk(npc->appearanceData.iX, npc->appearanceData.iY);
         auto chunks = ChunkManager::grabChunks(chunk);
 
@@ -322,7 +323,7 @@ void TransportManager::stepNPCPathing() {
 /*
  * Linearly interpolate between two points and insert the results into a queue.
  */
-static void TransportManager::lerp(std::queue<WarpLocation>* queue, WarpLocation start, WarpLocation end, int gapSize) {
+void TransportManager::lerp(std::queue<WarpLocation>* queue, WarpLocation start, WarpLocation end, int gapSize) {
     int dXY = hypot(end.x - start.x, end.y - start.y); // XY plane distance
     int distanceBetween = hypot(dXY, end.z - start.z); // total distance
     int lerps = distanceBetween / gapSize; // integer division to ensure a whole number of in-between points

src/TransportManager.hpp

@@ -31,5 +31,5 @@ namespace TransportManager {
     void stepNPCPathing();
     void stepSkywaySystem();
 
-    static void lerp(std::queue<WarpLocation>*, WarpLocation, WarpLocation, int);
+    void lerp(std::queue<WarpLocation>*, WarpLocation, WarpLocation, int);
 }