Multiple entities + pathfinding

cpp/src/entities.cpp

@@ -46,6 +46,28 @@ void Entity::Update(float time_delta) {
   m_Position += m_ActualVelocity * time_delta;
 }
 
+std::optional<WorldPos> Entity::GetMoveTarget()
+{
+  auto& path = GetPath();
+  if (path.empty()) {
+    return {};
+  }
+
+  WorldPos current_pos = GetPosition();
+  WorldPos next_pos = path.front();
+
+  if (current_pos.DistanceTo(next_pos) > 1.0) {
+    // target not reached yet
+    return next_pos;
+  }
+  // target reached, pop it
+  //m_MoveQueue.pop();
+  path.erase(path.begin());
+  // return nothing - if there's next point in the queue,
+  // we'll get it in the next iteration
+  return {};
+}
+
 Player::Player() {
   LOG_DEBUG(".");
   if (m_Sprite == nullptr) {

cpp/src/entities.hpp

@@ -5,10 +5,12 @@
 #include <iostream>
 #include <memory>
 #include <string_view>
+#include <optional>
 
 #include "log.hpp"
 #include "math.hpp"
 #include "sprite.hpp"
+#include "pathfinder/base.hpp"
 
 class Entity {
 public:
@@ -56,10 +58,16 @@ public:
 
   void ZeroActualVelocityInDirection(WorldPos direction);
 
+  const pathfinder::Path& GetPath() const { return m_Path; }
+  pathfinder::Path& GetPath() { return m_Path; }
+  void SetPath(pathfinder::Path& path) { m_Path = path; }
+  std::optional<WorldPos> GetMoveTarget();
+
 protected:
   WorldPos m_Position;
   WorldPos m_ActualVelocity;
   WorldPos m_RequestedVelocity;
+  pathfinder::Path m_Path;
 
 private:
   bool m_FlagExpired = false;

cpp/src/gameloop.cpp

@@ -27,12 +27,17 @@ void GameLoop::Draw() {
   }
 
   // draw the path, if it exists
-  WorldPos start_pos = m_Game->GetPlayer()->GetPosition();
-  for (const auto &next_pos : m_Game->GetPath()) {
-    const auto &camera = m_Game->GetCamera();
-    m_Window->DrawLine(camera.WorldToWindow(start_pos),
-                       camera.WorldToWindow(next_pos));
-    start_pos = next_pos;
+
+  for (const auto& entity : m_Game->GetEntities())
+  {
+    WorldPos start_pos = entity->GetPosition();
+    for (const auto &next_pos : entity->GetPath())
+    {
+      const auto &camera = m_Game->GetCamera();
+      m_Window->DrawLine(camera.WorldToWindow(start_pos),
+                         camera.WorldToWindow(next_pos));
+      start_pos = next_pos;
+    }
   }
 
   // draw all the entities (player etc)
@@ -49,9 +54,10 @@ void GameLoop::Run() {
   LOG_INFO("Running the game");
   while (!m_Game->IsExitRequested()) {
     m_Game->HandleActions(m_UserInput->GetActions());
-    m_Game->UpdatePlayerVelocity();
+    m_Game->UpdateWorld();
 
     // TODO measure fps, draw only if delay for target fps was reached
+    // or create a separate thread for drawing
     m_Window->ClearWindow();
     Draw();
     m_Window->Flush();

cpp/src/pathfindingdemo.cpp

@@ -55,54 +55,57 @@ void PathFindingDemo::CreateMap() {
   m_Map.PaintLine(TilePos{84,81}, TilePos{84,96}, 1.0, TileType::WALL);
   m_Map.PaintLine(TilePos{78,87}, TilePos{78,100}, 1.0, TileType::WALL);
 
-  // add player
+  // add some controllable entities 
   m_Entities.clear();
-  m_Player = std::make_shared<Player>();
-  m_Player->SetPosition(m_Map.TileToWorld(TilePos{25, 20}));
-  m_Entities.push_back(m_Player);
+  auto player = std::make_shared<Player>();
+  player->SetPosition(m_Map.TileToWorld(TilePos{25, 20}));
+  AddEntity(player);
+
+  auto player2 = std::make_shared<Player>();
+  player2->SetPosition(m_Map.TileToWorld(TilePos{50, 20}));
+  AddEntity(player2);
+
+
+  // select everything - TODO this is just temporary for testing
+  for (const auto& entity : m_Entities)
+  {
+    m_SelectedEntities.push_back(entity);
+  }
 }
 
 WorldPos PathFindingDemo::GetRandomPosition() const {
   return WorldPos{0.0f, 0.0f}; // totally random!
 }
 
-std::optional<WorldPos> PathFindingDemo::GetMoveTarget() {
-  WorldPos player_current_pos = GetPlayer()->GetPosition();
 
-  if (m_Path.empty()) {
-    return {};
-  }
 
-  WorldPos player_next_pos = m_Path.front();
+// Update entity positions, handle collisions
+void PathFindingDemo::UpdateWorld() {
   
-  if (player_current_pos.DistanceTo(player_next_pos) > 1.0) {
-    // target not reached yet
-    return player_next_pos;
-  }
-  // target reached, pop it
-  //m_MoveQueue.pop();
-  m_Path.erase(m_Path.begin());
-  // return nothing - if there's next point in the queue,
-  // we'll get it in the next iteration
-  return {};
-}
-
-void PathFindingDemo::UpdatePlayerVelocity() {
-  auto player = GetPlayer();
-  auto current_pos = player->GetPosition();
-  double tile_velocity_coeff = m_Map.GetTileVelocityCoeff(current_pos);
-  auto next_pos = GetMoveTarget();
-  WorldPos velocity = WorldPos{};
-  if (next_pos)
-  {
-    velocity = next_pos.value() - current_pos;
-    velocity.Normalize();
-    //LOG_DEBUG("I want to move to: ", next_pos.value(),
-    //          ", velocity: ", velocity);
-  }
-  player->SetActualVelocity(velocity * tile_velocity_coeff);
   float time_delta = 1.0f;
-  player->Update(time_delta);
+  
+  for (auto& entity : m_Entities)
+  {
+    // calculate the velocity
+    auto current_pos = entity->GetPosition();
+    double tile_velocity_coeff = m_Map.GetTileVelocityCoeff(current_pos);
+    auto next_pos = entity->GetMoveTarget();
+    WorldPos velocity = WorldPos{};
+    if (next_pos)
+    {
+      velocity = next_pos.value() - current_pos;
+      velocity.Normalize();
+      //LOG_DEBUG("I want to move to: ", next_pos.value(),
+      //          ", velocity: ", velocity);
+    }
+    entity->SetActualVelocity(velocity * tile_velocity_coeff);
+    
+
+    // handle collisions - these may modify the velocity
+ 
+    // update the position
+    entity->Update(time_delta);
+  }
 }
 
 void PathFindingDemo::HandleActions(const std::vector<UserAction> &actions)
@@ -116,10 +119,19 @@ void PathFindingDemo::HandleActions(const std::vector<UserAction> &actions)
     }
     else if (action.type == UserAction::Type::SET_MOVE_TARGET)
     {
-      WorldPos wp = m_Camera.WindowToWorld(action.Argument.position);
-      LOG_INFO("Calculating path to target: ", wp);
-      m_Path = m_PathFinder->CalculatePath(m_Player->GetPosition(), wp);
-      LOG_INFO("Done, path node count: ", m_Path.size());
+      WorldPos target_pos = m_Camera.WindowToWorld(action.Argument.position);
+      for (auto& selected_entity : m_SelectedEntities)
+      {
+        LOG_INFO("Calculating path to target: ", target_pos);
+        if (auto sp = selected_entity.lock())
+        {
+          auto path = m_PathFinder->CalculatePath(sp->GetPosition(), target_pos);
+          sp->SetPath(path);
+          LOG_INFO("Done, path node count: ", path.size());
+        } else {
+          LOG_INFO("Cannot calculate path for destroyed entity (weak_ptr.lock() failed)");
+        }
+      }
     }
     else if (action.type == UserAction::Type::SELECT_PATHFINDER)
     {

cpp/src/pathfindingdemo.hpp

@@ -22,17 +22,14 @@ public:
   PathFindingDemo &operator=(const PathFindingDemo &) = delete;
   PathFindingDemo &operator=(PathFindingDemo &&) = delete;
 
-  std::shared_ptr<Player> GetPlayer() { return m_Player; }
   std::vector<std::shared_ptr<Entity>>& GetEntities() { return m_Entities; }
   const Map& GetMap() const { return m_Map; }
   const Camera& GetCamera() const { return m_Camera; }
-  const pathfinder::Path& GetPath() const { return m_Path; }
   bool IsExitRequested() const { return m_ExitRequested; }
 
   void AddEntity(std::shared_ptr<Entity> e);
   void CreateMap();
-  std::optional<WorldPos> GetMoveTarget();
-  void UpdatePlayerVelocity();
+  void UpdateWorld();
   void HandleActions(const std::vector<UserAction> &actions);
   WorldPos GetRandomPosition() const;
 
@@ -41,7 +38,6 @@ private:
   Map m_Map;
   Camera m_Camera;
   std::vector<std::shared_ptr<Entity>> m_Entities;
-  std::shared_ptr<Player> m_Player;
-  pathfinder::Path m_Path;
   std::unique_ptr<pathfinder::PathFinderBase> m_PathFinder;
+  std::vector<std::weak_ptr<Entity>> m_SelectedEntities;
 };