implement ui

src/lib/sim/Simulation.cpp

@@ -389,6 +389,25 @@ bool Simulation::isBlueprintUnlocked(const std::string& shipId) const
     return it->second.unlocked;
 }
 
+EntityId Simulation::tryPlaceBuilding(BuildingType type, QPoint anchor, Rotation rotation)
+{
+    int cost = 0;
+    for (const BuildingDef& def : m_config.buildings.buildings)
+    {
+        if (def.type == type)
+        {
+            cost = def.cost;
+            break;
+        }
+    }
+    if (m_buildingBlocksStock < cost)
+    {
+        return kInvalidEntityId;
+    }
+    m_buildingBlocksStock -= cost;
+    return m_buildingSystem->place(type, anchor, rotation, m_currentTick);
+}
+
 BuildingSystem& Simulation::buildings()
 {
     return *m_buildingSystem;

src/lib/sim/Simulation.h

@@ -6,11 +6,15 @@
 #include <string>
 #include <vector>
 
+#include <QPoint>
+
 #include "BeltSystem.h"
 #include "BlueprintDropEvent.h"
+#include "BuildingType.h"
 #include "EntityId.h"
 #include "FireEvent.h"
 #include "GameConfig.h"
+#include "Rotation.h"
 #include "Tick.h"
 
 class BuildingSystem;
@@ -44,6 +48,10 @@ public:
     int  blueprintLevel(const std::string& shipId)    const;
     bool isBlueprintUnlocked(const std::string& shipId) const;
 
+    // Checks affordability, deducts building blocks, and places the building.
+    // Returns the new entity id, or kInvalidEntityId if blocks are insufficient.
+    EntityId tryPlaceBuilding(BuildingType type, QPoint anchor, Rotation rotation);
+
     BuildingSystem&       buildings();
     const BuildingSystem& buildings() const;
     BeltSystem&           belts();