Implemented "level terrain" feature, fix #28

src/engine/EventManager.cxx

@@ -55,21 +55,21 @@ void EventManager::pickTileUnderCursor(Point mouseIsoCoords)
   // update placement mode
   switch (topMostActiveLayer)
   {
-    case Layer::BUILDINGS:
-      GameStates::instance().placementMode = PlacementMode::SINGLE;
-      break;
-    case Layer::ROAD:
-    case Layer::POWERLINES:
-    case Layer::UNDERGROUND:
-      GameStates::instance().placementMode = PlacementMode::LINE;
-      break;
-    case Layer::GROUND_DECORATION:
-    case Layer::WATER:
-    case Layer::ZONE:
-      GameStates::instance().placementMode = PlacementMode::RECTANGLE;
-      break;
-    default:
-      break;
+  case Layer::BUILDINGS:
+    GameStates::instance().placementMode = PlacementMode::SINGLE;
+    break;
+  case Layer::ROAD:
+  case Layer::POWERLINES:
+  case Layer::UNDERGROUND:
+    GameStates::instance().placementMode = PlacementMode::LINE;
+    break;
+  case Layer::GROUND_DECORATION:
+  case Layer::WATER:
+  case Layer::ZONE:
+    GameStates::instance().placementMode = PlacementMode::RECTANGLE;
+    break;
+  default:
+    break;
   }
   mapNodeData = node.getMapNodeData();
   tileToPlace = mapNodeData[topMostActiveLayer].tileID;
@@ -408,7 +408,7 @@ void EventManager::checkEvents(SDL_Event &event)
       break;
     case SDL_MOUSEBUTTONDOWN:
       m_placementAllowed = false;
-      
+
       if (event.button.button == SDL_BUTTON_RIGHT)
       {
         m_panning = true;
@@ -488,6 +488,10 @@ void EventManager::checkEvents(SDL_Event &event)
         {
           MapFunctions::instance().changeHeight(mouseIsoCoords, false);
         }
+        else if (terrainEditMode == TerrainEdit::LEVEL)
+        {
+          MapFunctions::instance().levelHeight(m_clickDownCoords, m_nodesToPlace);
+        }
         else if (demolishMode)
         {
           MapFunctions::instance().demolishNode(m_nodesToHighlight, true);
@@ -518,7 +522,8 @@ void EventManager::checkEvents(SDL_Event &event)
       if (highlightSelection)
       {
         m_nodesToHighlight.push_back(mouseIsoCoords);
-        if (!uiManager.isMouseHovered() && !tileToPlace.empty() && !MapFunctions::instance().setTileID(tileToPlace, mouseIsoCoords))
+        if (!uiManager.isMouseHovered() && !tileToPlace.empty() &&
+            !MapFunctions::instance().setTileID(tileToPlace, mouseIsoCoords))
         {
           MapFunctions::instance().highlightNode(mouseIsoCoords, SpriteHighlightColor::RED);
         }

src/engine/map/MapFunctions.cxx

@@ -13,10 +13,7 @@
 #include <set>
 #include <queue>
 
-MapFunctions::MapFunctions()
-{
-  SignalMediator::instance().registerCbSaveGame(Signal::slot(this, &MapFunctions::saveMapToFile));
-}
+MapFunctions::MapFunctions() { SignalMediator::instance().registerCbSaveGame(Signal::slot(this, &MapFunctions::saveMapToFile)); }
 
 bool MapFunctions::updateHeight(Point coordinate, const bool elevate)
 {
@@ -63,6 +60,77 @@ void MapFunctions::changeHeight(const Point &isoCoordinates, const bool elevate)
   }
 }
 
+void MapFunctions::levelHeight(const Point &startCoordinate, const Vector<Point> levelArea)
+{
+  const MapNode &startNode = getMapNode(startCoordinate);
+  int initialHeight = startCoordinate.height;
+
+  /* If the initial node is sloped, check if a majority of it's neighbors,
+	* not counting other sloped nodes are elevated.
+	* If so, the initial node should be regarded as elevated too,
+	* i.e. the height should be incremented.
+	* This seems to yield the most intuitive behavior on slopes.
+	*/
+  if (startNode.isSlopeNode())
+  {
+    char directNeighbors =
+        NeighborNodesPosition::LEFT | NeighborNodesPosition::TOP | NeighborNodesPosition::RIGHT | NeighborNodesPosition::BOTTOM;
+    char elBitmask = startNode.getElevationBitmask();
+
+    int nonSelectedNeighborsCount = 0;
+    int elevatedNonSelectedNeighborsCount = 0;
+
+    for (Point neighbor : PointFunctions::getNeighbors(startCoordinate, false))
+    {
+      const NeighborNodesPosition neighborPosToOrigin = PointFunctions::getNeighborPositionToOrigin(neighbor, startCoordinate);
+      const bool isSloped = getMapNode(neighbor).isSlopeNode();
+
+      // Only look at non-sloped direct neighbors not in the selection.
+      if (!isSloped && (neighborPosToOrigin & directNeighbors) > 0 &&
+          std::find(levelArea.begin(), levelArea.end(), neighbor) == levelArea.end())
+      {
+        nonSelectedNeighborsCount++;
+
+        if ((neighborPosToOrigin & elBitmask) > 0)
+          elevatedNonSelectedNeighborsCount++;
+      }
+    }
+
+    if (elevatedNonSelectedNeighborsCount * 2 > nonSelectedNeighborsCount)
+      // No need to check max height since there are elevated neighbors.
+      initialHeight++;
+  }
+
+  Vector<Point> neighborsToLower;
+
+  for (const Point &levelPoint : levelArea)
+  {
+    // If a node gets lowered, save all it's neighbors to be lowered aswell.
+    // We have to get the node first, since the coordinates in the area are generated with height=0
+    if (getMapNode(levelPoint).getCoordinates().height > initialHeight)
+    {
+      // This possibly stores nodes that have already been processed for another round.
+      // It's faster than checking if each node is in levelArea first though.
+      Vector<Point> neighbors = PointFunctions::getNeighbors(levelPoint, false);
+      neighborsToLower.insert(neighborsToLower.end(), neighbors.begin(), neighbors.end());
+    }
+
+    Point newCoordinates = Point(levelPoint.x, levelPoint.y, levelPoint.z, initialHeight);
+    MapNode &levelNode = getMapNode(levelPoint);
+    levelNode.setCoordinates(newCoordinates);
+  }
+
+  for (const Point &levelPoint : neighborsToLower)
+  {
+    Point newCoordinates = Point(levelPoint.x, levelPoint.y, levelPoint.z, initialHeight);
+    MapNode &levelNode = getMapNode(levelPoint);
+    levelNode.setCoordinates(newCoordinates);
+  }
+
+  updateNodeNeighbors(levelArea);
+  updateNodeNeighbors(neighborsToLower);
+}
+
 void MapFunctions::updateNodeNeighbors(const std::vector<Point> &nodes)
 {
   // those bitmask combinations require the tile to be elevated.

src/engine/map/MapFunctions.hxx

@@ -4,6 +4,7 @@
 // #include "WindowManager.hxx"
 // #include "basics/Point.hxx"
 #include "../Map.hxx"
+#include "audio/AudioConfig.hxx"
 // #include "../../util/Singleton.hxx"
 #include <Singleton.hxx>
 #include <Point.hxx>
@@ -27,6 +28,12 @@ public:
   */
   bool updateHeight(Point coordinate, const bool elevate);
 
+  /** \brief level area of map nodes.
+	* @param startcoordinate the starting point whose height is used for levelling
+	* @param levelArea the area that is to be leveled.
+	*/
+  void levelHeight(const Point &startCoordinate, const Vector<Point> levelArea);
+
   /** \brief Get pointer to a single mapNode at specific iso coordinates.
   * @param isoCoords The node to retrieve.
   */
@@ -197,4 +204,4 @@ private:
   std::vector<uint8_t> calculateAutotileBitmask(Point coordinate);
 };
 
-#endif
+#endif