void DrawBorder(Vector2 position, int width, int height)
{
TileIndex borderTiles = new TileIndex(0, 1);
for (int j = 0; j < height; j++)
{
int row;
if (j == 0) row = 0;
else if (j == height - 1) row = 2;
else row = 1;
for (int i = 0; i < width; i++)
{
int column;
if (i == 0) column = 0;
else if (i == width - 1) column = 2;
else column = 1;
TileIndex tile = borderTiles + new TileIndex(column, row);
TileEngine.DrawTile(Assets.UITiles, tile, position + new Vector2(i, j) * Assets.CellSize);
}
}
}
public void Update()
{
List<Action> diagnostics = new List<Action>();
AnimationTimer += 1;
bool advanceFrame = false;
if (AnimationTimer >= Assets.AnimationPeriod)
{
AnimationTimer -= Assets.AnimationPeriod;
advanceFrame = true;
}
//==========================================================================================
// Conversations:
//==========================================================================================
List<Creature> availableConversers = new List<Creature>();
foreach (Creature creature in Creatures)
{
if (creature != Player)
{
float distance = (creature.Position - Player.Position).Length();
if (creature.Conversation.Length > 0 && distance < 96)
{
availableConversers.Add(creature);
}
if (creature.CanKill && State == GameState.Playing && distance < 48)
{
State = GameState.Losing;
Engine.StopMusic(2.0f);
}
if (creature.CanWin && State == GameState.Playing && distance < 48)
{
State = GameState.Winning;
Engine.StopMusic(2.0f);
}
}
}
Conversers.RemoveAll(x => !availableConversers.Contains(x));
if (!InConversation && availableConversers.Count > 0 && Engine.GetKeyDown(Key.J))
{
// Begin a conversation:
Creature other = availableConversers[0];
Conversers.Add(other);
ConversationPage = 0;
if (other.Thought == Thought.WaitToJoin) other.Thought = Thought.Follow;
}
else if (InConversation && Engine.GetKeyDown(Key.J))
{
// Continue a conversation:
ConversationPage += 1;
}
//==========================================================================================
// Player input:
//==========================================================================================
Vector2 input = Vector2.Zero;
if (Engine.GetKeyHeld(Key.A)) input.X -= 1;
if (Engine.GetKeyHeld(Key.D)) input.X += 1;
if (Engine.GetKeyHeld(Key.W)) input.Y -= 1;
if (Engine.GetKeyHeld(Key.S)) input.Y += 1;
Player.Movement = input;
if (input.Length() != 0)
{
ShowMoveTip = false;
}
//==========================================================================================
// AI:
//==========================================================================================
foreach (Creature creature in Creatures)
{
if (creature.Thought == Thought.Follow)
{
Vector2 vectorToPlayer = Player.Position - creature.Position;
float distanceToPlayer = vectorToPlayer.Length();
if (distanceToPlayer > creature.FollowDistanceMin && distanceToPlayer < creature.FollowDistanceMax)
{
creature.Movement = vectorToPlayer.Normalized();
}
else
{
creature.Movement = Vector2.Zero;
}
}
}
//==========================================================================================
// Physics:
//==========================================================================================
foreach (Creature creature in Creatures)
{
if (State != GameState.Playing)
{
creature.Movement = Vector2.Zero;
creature.Velocity = Vector2.Zero;
}
creature.Velocity += creature.Movement * creature.MaxAcceleration * Engine.TimeDelta;
creature.Velocity.X = Clamp(creature.Velocity.X, -creature.Speed, creature.Speed);
creature.Velocity.Y = Clamp(creature.Velocity.Y, -creature.Speed, creature.Speed);
// Update sprite facing:
if (creature.Movement.X < 0) creature.Facing = TextureMirror.Horizontal;
if (creature.Movement.X > 0) creature.Facing = TextureMirror.None;
// Update position and collide:
{
// These bounds describe the "solid" part of the entity; it is independent of position.
Bounds2 creatureShape = new Bounds2(
new Vector2(1 / 8f, 6 / 8f) * Assets.CellSize,
new Vector2(6 / 8f, 2 / 8f) * Assets.CellSize);
Vector2 motion = creature.Velocity * Engine.TimeDelta;
TileIndex nearest = GetCellAt(creature.Position, Assets.WallTiles);
// Find everything that could be collided with:
List<Bounds2> obstacles = new List<Bounds2>();
for (int row = nearest.Row - 2; row <= nearest.Row + 2; row++)
{
for (int column = nearest.Column - 2; column <= nearest.Column + 2; column++)
{
if (Obstacles[column, row])
{
Bounds2 obstacleBounds = new Bounds2(
new Vector2(column, row) * Assets.CellSize,
Assets.CellSize);
// The effective bounds are the sum of the obstacle's and the mover's bounds:
Vector2 min = obstacleBounds.Min - creatureShape.Max;
Vector2 max = obstacleBounds.Max - creatureShape.Min;
Bounds2 totalBounds = new Bounds2(min, max - min);
obstacles.Add(totalBounds);
if (Game.DebugCollision && creature == Player)
{
diagnostics.Add(() => Engine.DrawRectEmpty(obstacleBounds.Translated(Origin), Color.Green));
}
}
}
}
// Calculate collision along the X and Y axes independently.
// Each calculation considers only motion along that axis.
// Performing these steps sequentially ensures that objects can't move diagonally through other objects.
// X step:
Vector2 position = creature.Position;
Vector2 newPosition = position + new Vector2(motion.X, 0);
foreach (Bounds2 bounds in obstacles)
{
// Leftward:
if (motion.X < 0 &&
position.Y > bounds.Position.Y &&
position.Y < bounds.Position.Y + bounds.Size.Y)
{
float limit = bounds.Position.X + bounds.Size.X;
if (position.X >= limit && newPosition.X < limit) newPosition.X = limit;
}
// Rightward:
if (motion.X > 0 &&
position.Y > bounds.Position.Y &&
position.Y < bounds.Position.Y + bounds.Size.Y)
{
float limit = bounds.Position.X;
if (position.X <= limit && newPosition.X > limit) newPosition.X = limit;
}
}
creature.Position.X = newPosition.X;
// Y step:
position = creature.Position;
newPosition = position + new Vector2(0, motion.Y);
foreach (Bounds2 bounds in obstacles)
{
// Upward:
if (motion.Y < 0 &&
position.X > bounds.Position.X &&
position.X < bounds.Position.X + bounds.Size.X)
{
float limit = bounds.Position.Y + bounds.Size.Y;
if (position.Y >= limit && newPosition.Y < limit) newPosition.Y = limit;
}
// Downward:
if (motion.Y > 0 &&
position.X > bounds.Position.X &&
position.X < bounds.Position.X + bounds.Size.X)
{
float limit = bounds.Position.Y;
if (position.Y <= limit && newPosition.Y > limit) newPosition.Y = limit;
}
}
creature.Position.Y = newPosition.Y;
if (Game.DebugCollision && creature == Player)
{
diagnostics.Add(() =>
{
Engine.DrawRectEmpty(creatureShape.Translated(Origin + creature.Position), Color.Green);
});
}
}
// Slow to a stop when there is no input -- separately on each axis:
if (creature.Movement.X == 0)
{
float speed = Math.Abs(creature.Velocity.X);
speed = Math.Max(0, speed - creature.Deceleration);
creature.Velocity.X = Math.Sign(creature.Velocity.X) * speed;
}
if (creature.Movement.Y == 0)
{
float speed = Math.Abs(creature.Velocity.Y);
speed = Math.Max(0, speed - creature.Deceleration);
creature.Velocity.Y = Math.Sign(creature.Velocity.Y) * speed;
}
}
//==========================================================================================
// Scroll to keep the player onscreen:
//==========================================================================================
{
Vector2 margin = new Vector2(300, 250);
Origin.X = Clamp(Origin.X,
-Player.Position.X + margin.X,
-(Player.Position.X + Assets.PropTiles.DestinationSize.X) + Game.Resolution.X - margin.X);
Origin.Y = Clamp(Origin.Y,
-Player.Position.Y + margin.Y,
-(Player.Position.Y + Assets.PropTiles.DestinationSize.Y) + Game.Resolution.Y - margin.Y);
}
//==========================================================================================
// Draw the static part of the map:
//==========================================================================================
for (int row = 0; row < MapHeight; row++)
{
for (int column = 0; column < MapWidth; column++)
{
TileEngine.DrawTile(Assets.WallTiles, Walls[column, row], Origin + new Vector2(column, row) * Assets.CellSize);
}
}
//==========================================================================================
// Draw creatures back-to-front:
//==========================================================================================
foreach (Creature creature in Creatures.OrderBy(x => x.IsFlat ? 0 : 1).ThenBy(x => x.Position.Y))
{
TileEngine.DrawTile(Assets.PropTiles, creature.Appearance[creature.Frame], Origin + creature.Position,
mirror: creature.Facing);
if (advanceFrame)
{
creature.Frame = (creature.Frame + 1) % creature.Appearance.Length;
}
}
//==========================================================================================
// Draw UI:
//==========================================================================================
if (InConversation)
{
string speech = Conversers[0].Conversation[ConversationPage];
int width = 16;
int height = 3;
Vector2 pos = new TileIndex((20 - width) / 2, 12 - height) * Assets.CellSize;
DrawBorder(pos, width, height);
pos += 0.5f * Assets.CellSize;
TileEngine.DrawTileString(Assets.FontTiles, speech, pos);
}
else if (availableConversers.Count > 0)
{
string text = "\x18 Converse";
Vector2 pos = new Vector2((20 - (text.Length + 1) / 2) / 2, 11) * Assets.CellSize;
TileEngine.DrawTileString(Assets.FontTiles, text, pos);
}
else if (ShowMoveTip)
{
string text = "\x1C \x1D \x1E \x1F Move";
Vector2 pos = new Vector2((20 - (text.Length + 1) / 2) / 2, 11) * Assets.CellSize;
TileEngine.DrawTileString(Assets.FontTiles, text, pos);
}
//==========================================================================================
// End of game cinematics:
//==========================================================================================
if (State == GameState.Losing)
{
if (advanceFrame)
{
EndGameFrame += 1;
if (EndGameFrame == Assets.EndMusicFrame) Engine.PlayMusic(Assets.LosingMusic, fadeTime: 6.0f);
}
Color background = Color.Black.WithAlpha(EndGameFrame / 5f);
Engine.DrawRectSolid(new Bounds2(Vector2.Zero, Game.Resolution), background);
string text = "You died";
float textAlpha = Clamp((EndGameFrame - 8) / 5f, 0, 1);
Color textColor = Assets.LosingTextColor.WithAlpha(textAlpha);
Vector2 pos = new Vector2((20 - (text.Length + 1) / 2) / 2, 5) * Assets.CellSize;
TileEngine.DrawTileString(Assets.FontTiles, text, pos, color: textColor);
}
else if (State == GameState.Winning)
{
if (advanceFrame)
{
EndGameFrame += 1;
if (EndGameFrame == Assets.EndMusicFrame) Engine.PlayMusic(Assets.WinningMusic, fadeTime: 6.0f);
}
Color background = Color.White.WithAlpha(EndGameFrame / 5f);
Engine.DrawRectSolid(new Bounds2(Vector2.Zero, Game.Resolution), background);
string text = "You escaped!";
float textAlpha = Clamp((EndGameFrame - 8) / 5f, 0, 1);
Color textColor = Assets.WinningTextColor.WithAlpha(textAlpha);
Vector2 pos = new Vector2((20 - (text.Length + 1) / 2) / 2, 5) * Assets.CellSize;
TileEngine.DrawTileString(Assets.FontTiles, text, pos, color: textColor);
}
if (EndGameFrame > 20)
{
string text = "\x1A New game";
Vector2 pos = new Vector2((20 - (text.Length + 1) / 2) / 2, 11) * Assets.CellSize;
Color color = (State == GameState.Winning) ? Assets.WinningTextColor : Assets.LosingTextColor;
TileEngine.DrawTileString(Assets.FontTiles, text, pos, color: color);
if (Engine.GetKeyDown(Key.N))
{
Restart = true;
}
}
//==========================================================================================
// Debug information:
//==========================================================================================
if (Game.Debug)
{
foreach (Action action in diagnostics)
{
action();
}
}
}