players must move when dropping lamps

if no direction is pressed, player dashes in direction of most recent movement. if no movement has occured, choose a random direction. if player cannot move in the chosen direction, choose a random direction. if the player cannot move in any direction, prevent dropping a lamp.

1 files changed, 77 insertions, 17 deletions

@@ -79,7 +79,7 @@ void tick(Game& game, bool onlyDark = false)
     onlyDark);
 }
 
-void movePlayer(Game& game, int x, int y)
+bool movePlayer(Game& game, int x, int y)
 {
   if (game.map.inBounds(x, y) && game.map.at(x,y).tile == Tile::Floor)
   {
@@ -94,6 +94,10 @@ void movePlayer(Game& game, int x, int y)
     game.player_y = y;
 
     game.dirtyLighting = true;
+
+    return true;
+  } else {
+    return false;
   }
 }
 
@@ -184,7 +188,7 @@ void recalculateLighting(Game& game)
   game.dirtyLighting = false;
 }
 
-void processKeys(Game& game, const Input& keystate)
+bool processKeys(Game& game, const Input& keystate)
 {
   int px = game.player_x;
   int py = game.player_y;
@@ -211,7 +215,9 @@ void processKeys(Game& game, const Input& keystate)
 
   if (!(game.player_x == px && game.player_y == py))
   {
-    movePlayer(game, px, py);
+    return movePlayer(game, px, py);
+  } else {
+    return false;
   }
 }
 
@@ -460,21 +466,69 @@ int main(int, char**)
                 if (game.map.at(game.player_x, game.player_y).tile ==
                       Tile::Floor)
                 {
-                  game.map.at(game.player_x, game.player_y).tile = Tile::Lamp;
-                  game.numLamps++;
-                  game.dirtyLighting = true;
-                  kickUpDust(game, game.player_x, game.player_y, 0);
-
-                  for (int i = 0; i < 5; i++)
+                  std::vector<coord> freeSpaces;
+
+                  auto addIfFree = [&] (int x, int y) {
+                    if (game.map.inBounds(x,y) &&
+                        game.map.at(x,y).tile == Tile::Floor)
+                    {
+                      freeSpaces.emplace_back(x, y);
+                    }
+                  };
+
+                  addIfFree(game.player_x - 1, game.player_y - 1);
+                  addIfFree(game.player_x    , game.player_y - 1);
+                  addIfFree(game.player_x + 1, game.player_y - 1);
+                  addIfFree(game.player_x - 1, game.player_y    );
+                  addIfFree(game.player_x + 1, game.player_y    );
+                  addIfFree(game.player_x - 1, game.player_y + 1);
+                  addIfFree(game.player_x    , game.player_y + 1);
+                  addIfFree(game.player_x + 1, game.player_y + 1);
+
+                  if (!freeSpaces.empty())
                   {
-                    processKeys(game, keystate);
-
-                    tick(
-                      game,
-                      game.player_x - (RADIUS - 1),
-                      game.player_y - (RADIUS - 1),
-                      game.player_x + RADIUS,
-                      game.player_y + RADIUS);
+                    game.map.at(game.player_x, game.player_y).tile = Tile::Lamp;
+                    game.numLamps++;
+                    game.dirtyLighting = true;
+                    kickUpDust(game, game.player_x, game.player_y, 0);
+
+                    if (game.firstInput)
+                    {
+                      for (int i = 0; i < 5; i++)
+                      {
+                        if (!processKeys(game, game.lastInput))
+                        {
+                          std::uniform_int_distribution<int> freeDist(
+                            0, freeSpaces.size() - 1);
+
+                          int freeIndex = freeDist(rng);
+                          coord& moveTo = freeSpaces[freeIndex];
+
+                          movePlayer(
+                            game,
+                            std::get<0>(moveTo),
+                            std::get<1>(moveTo));
+                        }
+
+                        tick(
+                          game,
+                          game.player_x - (RADIUS - 1),
+                          game.player_y - (RADIUS - 1),
+                          game.player_x + RADIUS,
+                          game.player_y + RADIUS);
+                      }
+                    } else {
+                      std::uniform_int_distribution<int> freeDist(
+                        0, freeSpaces.size() - 1);
+
+                      int freeIndex = freeDist(rng);
+                      coord& moveTo = freeSpaces[freeIndex];
+
+                      movePlayer(
+                        game,
+                        std::get<0>(moveTo),
+                        std::get<1>(moveTo));
+                    }
                   }
                 }
               }
@@ -491,6 +545,12 @@ int main(int, char**)
       keystate.up = state[SDL_SCANCODE_UP];
       keystate.down = state[SDL_SCANCODE_DOWN];
 
+      if (keystate.left || keystate.right || keystate.up || keystate.down)
+      {
+        game.firstInput = true;
+        game.lastInput = keystate;
+      }
+
       dustAcc += frameTime;
       inputAcc += frameTime;