Add TriggerCell for more in-game fun

src/cell.cpp

@@ -131,3 +131,31 @@ bool TeleportCell::onMovingTo(HeroPtr &hero, LevelPtr &level)
     hero->setPosition(new_x, new_y);
     return true;
 }
+
+///////////////////////////////////////
+
+TriggerCell::TriggerCell(coordinate cell_x, coordinate cell_y, const std::vector<CellPtr> &cells_to_change, const sf::Color &color) :
+    Cell(cell_x, cell_y, color)
+{
+	cells.assign(std::move(cells_to_change));
+}
+
+TriggerCell::~TriggerCell()
+{}
+
+bool TriggerCell::onMovingTo(HeroPtr &hero, LevelPtr &level)
+{
+    UNUSED(hero)
+
+	Map &map = level->mapArray();
+
+	// We replace needed cells with the ones that the trigger provides.
+    for (const &cell : cells)
+		map[cell->x()][cell->y()].reset(cell.release());
+	
+	// Trigger works only once.
+	cells.clear();
+	
+	// It's an impassable object, so player can't move to here.
+    return false;
+}

src/cell.h

@@ -10,6 +10,7 @@ class Level;
 
 using HeroPtr   = std::unique_ptr<Hero>;
 using LevelPtr  = std::unique_ptr<Level>;
+using CellPtr   = std::unique_ptr<Cell>;
 
 ///////////////////////////////////////
 
@@ -131,4 +132,24 @@ public:
     virtual bool onMovingTo(HeroPtr &hero, LevelPtr &level) override;
 };
 
+///////////////////////////////////////
+
+/// A cell which replaces and changes other map cells when activated
+class TriggerCell : public Cell
+{
+private:
+	// Vector of cells to place on map
+	std::vector<CellPtr> cells;
+
+public:
+    TriggerCell(coordinate cell_x = 0,
+                coordinate cell_y = 0,
+                const std::vector<CellPtr> &cells_to_change = std::vector<CellPtr>(),  // Pink
+                const sf::Color &color = sf::Color(255, 192, 203));
+
+    virtual ~TriggerCell() override;
+
+    virtual bool onMovingTo(HeroPtr &hero, LevelPtr &level) override;
+};
+
 #endif // CELL_H