protected override void UpdateScreen(GameTime gameTime, DisplayOrientation screenOrientation)
{
//the food meter is constantly decreasing, even when not moving. It decreases faster when moving.
//level.Play();
if (!gameOver)
{
//death timer
if (timerStarted)
{
deathTimer.Tick(true);
}
else
{
deathTimer.SetTimer(0, 0, DOOM_TIME);
}
//start playing music
if (MediaPlayer.GameHasControl && !musicIsPlaying)
{
MediaPlayer.Play(gameMusic);
MediaPlayer.IsRepeating = true;
musicIsPlaying = true;
}
//check for player effects
player.ReduceTimer();
if (player.EffectEnded)
{
player.SetMod(0);
}
//display food value number
if (foodValueDisplayed)
{
foodValuePos.Y -= 1;
float distance = (foodValuePos.Y - player.Position().Y) * (foodValuePos.Y - player.Position().Y);
if (distance > 3000)
{
foodValueDisplayed = false;
}
}
if (levelUpDisplayed)
{
levelUpMsgPos.Y -= 1;
float dist = (levelUpMsgPos.Y - player.Position().Y) * (levelUpMsgPos.Y - player.Position().Y);
if (dist > 6000)
{
levelUpDisplayed = false;
}
}
if (foodList.Count != DROP_LIMIT)
{
dropTimer += 0.1f;
int foodX = foodPos.Next(Screen.ScreenWidth - 30);
if (dropTimer > MAX_TIMER)
{
dropTimer = 0;
foodItem = foodManager.GenerateFood(new Vector2(foodX, -50));
foodList.Add(foodItem);
}
}
if (BackButtonPressed())
{
//reset game
Reset();
//stop music
if (MediaPlayer.GameHasControl)
{
MediaPlayer.Stop();
}
}
//jump button action
if (input.IsPressed(jumpButtonPressed) && !playerIsJumping)
{
playerIsJumping = true;
vy -= JUMP_VEL;
}
//foodItem.ActivateSpecial(player);
if (input.IsPressed(screenTapped))
{
//set the tapped location. The tapped location uses a circle to indicate where the creature is moving.
tapLocation.X = input.CurrentGesturePosition(screenTapped).X;
tapLocation.Y = input.CurrentGesturePosition(screenTapped).Y;
friction = 1;
playerIsMoving = true;
}
//update player position
float playerX = player.Position().X;
if (playerIsMoving)
{
//increase food meter burn rate
foodMeter.SetCurrentRate(1.0f);
friction = 1;
float distance = (tapLocation.X - playerX) * (tapLocation.X - playerX); //(x2 - x1)^2
//move player to touch location.
if (playerX <= tapLocation.X)
{
if (distance > MAX_DISTANCE)
{
vx = PLAYER_TURBO_SPEED + player.MoveMod();
foodMeter.SetCurrentRate(1.5f);
}
else
{
vx = PLAYER_MOVE_SPEED + player.MoveMod();
}
}
else if (playerX > tapLocation.X)
{
if (distance > MAX_DISTANCE)
{
vx = -PLAYER_TURBO_SPEED - player.MoveMod();
foodMeter.SetCurrentRate(1.5f);
}
else
{
vx = -PLAYER_MOVE_SPEED - player.MoveMod();
}
}
//TODO: Figure out how to prevent player from moving in opposite direction when tapping
//on same point as player's current position.
//slow down player when minimum distance is reached
playerIsMoving = (distance <= MIN_DISTANCE) ? false : true;
}
else
{
foodMeter.SetCurrentRate(0);
friction = FRICTION;
}
//apply gravity to objects
vx *= friction;
foodVy = FOOD_DROP_SPEED + GRAVITY;
//only apply gravity when airborne
if (playerIsJumping)
{
vy += GRAVITY;
}
//drop food
foreach (Food f in foodList)
{
float y = f.Position().Y + foodVy;
if (y > GROUND_HEIGHT + f.FoodImage().Height)
{
y = GROUND_HEIGHT + f.FoodImage().Height;
f.Countdown(); //decays only when on the ground
}
f.SetPosition(new Vector2(f.Position().X, y));
if (f.IsDecayed()) //remove item if decayed
{
trashCan.Add(f);
}
//collision checking
else if (player.Collides(f))
{
//play sound
soundEffects.PlaySound(@"Sounds/foodpickup");
//destroy food and add its value to the meter
foodMeter.IncreaseMeter(f.FoodValue());
foodValueDisplayed = true;
foodValuePos = new Vector2(player.Position().X, player.Position().Y - 25);
foodValue = f.FoodValue();
effectMsg = f.EffectMessage();
f.ActivateSpecial(player); //use any special abilities on player.
lastItemPickup = f.FoodName() + " " + f.FoodValue().ToString() + "pts.";
lastItemImg = f.FoodImage();
trashCan.Add(f);
//Debug.WriteLine("Collided with food " + foodList.IndexOf(f));
}
}
playerX += vx;
//boundary check
if (playerX + playerImg.Width > Screen.ScreenWidth)
{
playerX = Screen.ScreenWidth - playerImg.Width;
}
float playerY = player.Position().Y + vy;
//check Y
if (playerY > GROUND_HEIGHT)
{
playerY = GROUND_HEIGHT;
vy = 0;
playerIsJumping = false;
}
player.SetPosition(new Vector2(playerX, playerY));
foodMeter.Update();
//check lose conditions
if (foodMeter.CapacityExceeded() && !timerStarted)
{
//start timer
timerStarted = true;
}
if (!foodMeter.CapacityExceeded() && timerStarted)
{
//this should occur if at some point the player is not over capacity but didn't complete the level
//while the death timer was counting down.
timerStarted = false;
deathTimer.SetTimer(0, 0, DOOM_TIME);
}
if (foodMeter.IsEmpty() || deathTimer.TimeUp()) //don't let this happen!
{
deathTimer.SetMilliseconds(0); //this is here so that the player isn't fooled into thinking they had more time remaining.
gameOver = true;
}
//check win condition
else if (foodMeter.LevelWon())
{
levelUpMsg = "Capacity Clear! Level +1";
//raise level and change the capacity marker.
levelNum++;
timerStarted = false;
deathTimer.SetTimer(0, 0, DOOM_TIME);
foodMeter.ResetMeter();
if (foodMeter.MarkerAtMinCapacity())
{
//every time the level is beaten with the marker at min capacity, its position is reduced and
//the width is reset. This increases the challenge over time, because the player is
//more likely to go over capacity and not be able to recover without eating the right food.
foodMeter.ResetCapacity();
levelUpMsg += "\nMarker Position Change";
foodMeter.ChangeMarkerPosition(-20);
}
else
{
foodMeter.DecreaseCapacity(10);
}
levelUpDisplayed = true;
levelUpMsgPos = new Vector2(200, player.Position().Y - 20);
}
//garbage cleanup
foreach (Food f in trashCan)
{
foodList.Remove(f);
}
base.UpdateScreen(gameTime, screenOrientation);
}
else
{
Die();
//if we're here, then game is over. Set a timer before being kicked back to title screen.
gameOverTimer.Tick(true);
if (gameOverTimer.TimeUp())
{
if (MediaPlayer.GameHasControl)
{
MediaPlayer.Stop();
}
Reset();
changeScreenDelegate(ScreenState.Title);
}
}
}