Add map pan

cpp/src/camera.cpp

@@ -1,16 +1,43 @@
 #include "camera.hpp"
 #include "math.hpp"
-
+#include "log.hpp"
 
 // for now only pass-through placeholder functions,
 // since we draw the whole map 
 
+
+void Camera::Pan(const WorldPos& delta)
+{
+  LOG_DEBUG("m_Pan before: ", m_Pan, " delta ", delta);
+  m_Pan += delta;
+  LOG_DEBUG("m_Pan after: ", m_Pan);
+}
+
+void Camera::Zoom(const WorldPos&)
+{
+
+}
+
 WindowPos Camera::WorldToWindow(WorldPos world) const
 {
-  return WindowPos{world[0], world[1]};
+  const auto& v = world + m_Pan;
+  return WindowPos{v[0], v[1]};
 }
 
 WorldPos Camera::WindowToWorld(WindowPos window) const
 {
-    return WorldPos{window[0], window[1]};
+    return WorldPos{window[0], window[1]} - m_Pan;
+}
+
+
+WindowSize Camera::WorldToWindowSize(WorldSize world) const
+{
+  const auto& v = world;
+  // no zoom yet, just pass-through
+  return WindowSize{v[0], v[1]};
+}
+
+WorldSize Camera::WindowToWorldSize(WindowSize window) const
+{
+    return WorldSize{window[0], window[1]};
 }

cpp/src/camera.hpp

@@ -5,12 +5,16 @@
 class Camera
 {
 public:
+  void Pan(const WorldPos& delta);
+  void Zoom(const WorldPos& delta);
+
   WindowPos  WorldToWindow(WorldPos)       const;
   WorldPos   WindowToWorld(WindowPos)      const;
+  WindowSize WorldToWindowSize(WorldSize)  const;
+  WorldSize  WindowToWorldSize(WindowSize) const;
 
 private:
   // TODO this should be replaced with a matrix
   float m_Zoom;
-  WorldPos m_RectCorner; // upper left corner (0,0) of the drawn regios
+  WorldPos m_Pan;
-
 };

cpp/src/gameloop.cpp

@@ -27,14 +27,19 @@ void GameLoop::Run() {
     for (size_t row = 0; row < tiles.size(); row++) {
       for (size_t col = 0; col < tiles[row].size(); col++) {
         const auto& camera = m_Game->GetCamera();
-        // LOG_DEBUG("Drawing rect (", row, ", ", col, ")");
+        const auto& position = camera.WorldToWindow(
-        m_Window->DrawRect(
-            camera.WorldToWindow(
           map.TileEdgeToWorld(
             TilePos{static_cast<int32_t>(row), static_cast<int32_t>(col)}
           )
-            ),
+        );
-            camera.WorldToWindow(map.GetTileSize()), tiles[row][col]->R, tiles[row][col]->G,
+        const auto& size = camera.WorldToWindowSize(
+              map.GetTileSize()
+        );
+        // LOG_DEBUG("Drawing rect (", row, ", ", col, ")");
+        m_Window->DrawRect(
+            position,
+            size,
+            tiles[row][col]->R, tiles[row][col]->G,
             tiles[row][col]->B, tiles[row][col]->A);
       }
     }

cpp/src/map.cpp

@@ -28,8 +28,7 @@ TilePos Map::WorldToTile(WorldPos p) const {
   return TilePos{static_cast<int32_t>(p.x() / TILE_SIZE), static_cast<int32_t>(p.y() / TILE_SIZE)};
 }
 
-// TODO this should probably use something like WorldSize or WorldVec to make the distinction clear
+WorldSize Map::GetTileSize() const { return WorldSize{TILE_SIZE, TILE_SIZE}; }
-WorldPos Map::GetTileSize() const { return WorldPos{TILE_SIZE, TILE_SIZE}; }
 
 const Tile *Map::GetTileAt(TilePos p) const {
   assert(IsTilePosValid(p));

cpp/src/map.hpp

@@ -26,7 +26,7 @@ public:
   WorldPos TileEdgeToWorld(TilePos p) const;
   TilePos WorldToTile(WorldPos p) const;
   
-  WorldPos GetTileSize() const;
+  WorldSize GetTileSize() const;
   const Tile *GetTileAt(TilePos p) const;
   const Tile *GetTileAt(WorldPos p) const;
 

cpp/src/math.hpp

@@ -238,14 +238,22 @@ using uvec3 = vec<std::uint32_t, 3>;
 using uvec4 = vec<std::uint32_t, 4>;
 
 // tags for differentiating between domains
-struct WorldTag {};
+struct WorldPosTag {};
-struct WindowTag {};
+struct WorldSizeTag {};
-struct TileTag {};
+struct WindowPosTag {};
+struct WindowSizeTag {};
+struct TilePosTag {};
+struct TileSizeTag {};
 
 // types for each domain
-using WorldPos = vec<float, 2, WorldTag>;
+using WorldPos = vec<float, 2, WorldPosTag>;
-using WindowPos = vec<float, 2, WindowTag>;
+using WindowPos = vec<float, 2, WindowPosTag>;
-using TilePos = vec<int32_t, 2, TileTag>;
+using TilePos = vec<int32_t, 2, TilePosTag>;
+// Size
+using WorldSize = vec<float, 2, WorldSizeTag>;
+using WindowSize = vec<float, 2, WindowSizeTag>;
+using TileSize = vec<int32_t, 2, TileSizeTag>;
+
 
 //
 // Utils
@@ -259,3 +267,121 @@ struct TilePosHash {
   }
 };
 
+// old stuff - TODO delete
+
+// constexpr double EQUALITY_LIMIT = 1e-6;
+// template <typename T> struct Vec2D {
+// public:
+//   Vec2D() = default;
+//   ~Vec2D() = default;
+//
+//   template <typename U>
+//   Vec2D(Vec2D<U> other) {
+//     this->x = static_cast<T>(other.x);
+//     this->y = static_cast<T>(other.y);
+//   }
+//
+//   Vec2D& operator+=(const Vec2D &other) {
+//     x += other.x;
+//     y += other.y;
+//     return *this;
+//   }
+//
+//   template <typename U>
+//   requires std::is_arithmetic_v<U>
+//   Vec2D& operator/=(U k) {
+//     this->x /= static_cast<T>(k);
+//     this->y /= static_cast<T>(k);
+//     return *this;
+//   }
+//
+//   friend Vec2D operator+(const Vec2D &a, const Vec2D &b) {
+//     return Vec2D{a.x + b.x, a.y + b.y};
+//   }
+//
+//   friend Vec2D operator-(const Vec2D &a, const Vec2D &b) {
+//     return Vec2D{a.x - b.x, a.y - b.y};
+//   }
+//
+//   template <typename U>
+//     requires std::is_arithmetic_v<U>
+//   friend Vec2D operator*(U k, const Vec2D &v)
+//   {
+//     return Vec2D{k * v.x, k * v.y};
+//   }
+//
+//   template <typename U>
+//     requires std::is_arithmetic_v<U>
+//   friend Vec2D operator/(const Vec2D &v, U k)
+//   {
+//     return Vec2D{v.x / k, v.y / k};
+//   }
+//
+//   friend bool operator==(const Vec2D &a, const Vec2D &b) {
+//     if constexpr (std::is_integral_v<T>) {
+//       return a.x == b.x && a.y == b.y;
+//     } else if constexpr (std::is_floating_point_v<T>) {
+//       return a.distance(b) < EQUALITY_LIMIT;
+//     } else {
+//       static_assert("Unhandled comparison");
+//     }
+//   }
+//
+//   Vec2D operator*(float b) const { return Vec2D{b * x, b * y}; }
+//
+//   T distance_squared(const Vec2D &other) const {
+//     T dx = x - other.x;
+//     T dy = y - other.y;
+//     return dx * dx + dy * dy;
+//   }
+//
+//   T distance(const Vec2D &other) const
+//     requires std::floating_point<T>
+//   {
+//     return sqrt(distance_squared(other));
+//   }
+//
+//   void normalize()
+//     requires std::floating_point<T>
+//   {
+//     auto length = sqrt(x * x + y * y);
+//     if (length < EQUALITY_LIMIT) {
+//       x = y = 0;
+//     } else {
+//       x /= length;
+//       y /= length;
+//     }
+//   }
+//
+//   Vec2D normalized()
+//     requires std::floating_point<T>
+//   {
+//     Vec2D v(*this);
+//     v.normalize();
+//     return v;
+//   }
+//
+//   Vec2D orthogonal() const
+//   {
+//     Vec2D v(*this);
+//
+//     std::swap(v.x, v.y);
+//     v.x = -v.x;
+//     return v;
+//   }
+//
+//   template <typename U> Vec2D(std::initializer_list<U> list) {
+//     assert(list.size() == 2);
+//     auto first_element = *list.begin();
+//     auto second_element = *(list.begin() + 1);
+//     x = static_cast<T>(first_element);
+//     y = static_cast<T>(second_element);
+//   }
+//
+//   T x, y;
+//
+//   friend std::ostream &operator<<(std::ostream &os, const Vec2D &obj) {
+//     os << "( " << obj.x << ", " << obj.y << ")";
+//     return os;
+//   }
+// };

cpp/src/pathfindingdemo.cpp

@@ -110,7 +110,7 @@ void PathFindingDemo::HandleActions(const std::vector<UserAction> &actions) {
       LOG_INFO("Exit requested");
       m_ExitRequested = true;
     } else if (action.type == UserAction::Type::SET_MOVE_TARGET) {
-      WorldPos wp = action.Argument.position;
+      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());
@@ -119,6 +119,11 @@ void PathFindingDemo::HandleActions(const std::vector<UserAction> &actions) {
       PathFinderType type = static_cast<PathFinderType>(action.Argument.number);
       m_PathFinder = pathfinder::utils::create(type, (const Map*)&m_Map);
       LOG_INFO("Switched to path finding method: ", m_PathFinder->GetName());
+    } else if (action.type == UserAction::Type::CAMERA_PAN) {
+      const auto& window_pan = action.Argument.position;
+      WorldPos world_pan{window_pan.x(), window_pan.y()};
+      m_Camera.Pan(world_pan);
+      LOG_INFO("Camera pan delta: ", world_pan);
     }
   };
 }

cpp/src/user_input.cpp

@@ -23,7 +23,11 @@ const std::vector<UserAction> &UserInput::GetActions() {
   m_Actions.clear();
   SDL_Event event;
   
+  static WindowPos mouse_pan_start;
+  static bool mouse_pan = false;
+
   while (SDL_PollEvent(&event)) {
+    // TODO refactor mouse / kbd handling into separate functions
     if (event.type == SDL_EVENT_KEY_DOWN || event.type == SDL_EVENT_KEY_UP) {
       bool key_down = event.type == SDL_EVENT_KEY_DOWN ? true : false;
       SDL_KeyboardEvent kbd_event = event.key;
@@ -55,9 +59,25 @@ const std::vector<UserAction> &UserInput::GetActions() {
       }
     } else if (event.type == SDL_EVENT_MOUSE_BUTTON_DOWN) {
       SDL_MouseButtonEvent mouse_event = event.button;
+      if (mouse_event.button == 1) {
         LOG_DEBUG("Mouse down: ", mouse_event.x, ", ", mouse_event.y);
         m_Actions.emplace_back(UserAction::Type::SET_MOVE_TARGET,
-                             WorldPos{mouse_event.x, mouse_event.y});
+                               WindowPos{mouse_event.x, mouse_event.y});
+      } else if (mouse_event.button == 2) {
+        mouse_pan = true;
+      }
+    } else if (event.type == SDL_EVENT_MOUSE_BUTTON_UP) {
+      SDL_MouseButtonEvent mouse_event = event.button;
+      if (mouse_event.button == 2) {
+        mouse_pan = false;
+      }
+    } else if (event.type == SDL_EVENT_MOUSE_MOTION) {
+      SDL_MouseMotionEvent motion_event = event.motion;
+      if (mouse_pan) {
+        m_Actions.emplace_back(UserAction::Type::CAMERA_PAN,
+                               WindowPos{motion_event.xrel, motion_event.yrel});
+        
+      }
     } else {
       // TODO uncomment, for now too much noise
       // LOG_WARNING("Action not processed");

cpp/src/user_input.hpp

@@ -9,25 +9,25 @@
 
 class UserAction {
 public:
-  enum class Type { NONE, EXIT, SET_MOVE_TARGET, SELECT_PATHFINDER };
+  enum class Type { NONE, EXIT, SET_MOVE_TARGET, SELECT_PATHFINDER, CAMERA_PAN, CAMERA_ZOOM };
 
   UserAction() : type(Type::NONE), Argument{.number = 0} {}
   UserAction(Type t) : type(t), Argument{.number = 0} {}
   UserAction(Type t, char key) : type(t), Argument{.key = key} {}
-  UserAction(Type t, WorldPos v) : type(t), Argument{.position = v} {}
+  UserAction(Type t, WindowPos v) : type(t), Argument{.position = v} {}
   UserAction(Type t, int arg) : type(t), Argument{.number = arg} {}
   ~UserAction() = default;
 
   Type type;
 
   union {
-    WorldPos position;
+    WindowPos position;
     char key;
     int number;
   } Argument;
 
   // TODO use std::variant
-  //std::variant<WorldPos, char, int> Argument;
+  //std::variant<WindowPos, char, int> Argument;
 };
 
 class UserInput {

cpp/src/window.cpp

@@ -84,7 +84,7 @@ void Window::DrawSprite(const WindowPos &position, Sprite &s) {
   SDL_RenderTexture(m_Renderer.get(), s.GetTexture(), nullptr, &rect);
 }
 
-void Window::DrawRect(const WindowPos &position, const WindowPos size, uint8_t R,
+void Window::DrawRect(const WindowPos &position, const WindowSize size, uint8_t R,
                       uint8_t G, uint8_t B, uint8_t A) {
   SDL_FRect rect = {position.x(), position.y(), size.x(), size.y()};
   SDL_SetRenderDrawColor(m_Renderer.get(), R, G, B, A);

cpp/src/window.hpp

@@ -23,7 +23,7 @@ public:
 
   std::expected<void, std::string> Init();
   void DrawSprite(const WindowPos &position, Sprite &s);
-  void DrawRect(const WindowPos &position, const WindowPos size, uint8_t R,
+  void DrawRect(const WindowPos &position, const WindowSize size, uint8_t R,
                 uint8_t G, uint8_t B, uint8_t A);
   void ClearWindow();
   void Flush();