public CharacterEntity (GraphicsDevice graphicsDevice)
{
if (characterSheetTexture == null)
{
using (var stream = TitleContainer.OpenStream ("Content/charactersheet.png"))
{
characterSheetTexture = Texture2D.FromStream (graphicsDevice, stream);
}
}
walkDown = new Animation ();
walkDown.AddFrame (new Rectangle (0, 0, 16, 16), TimeSpan.FromSeconds (.25));
walkDown.AddFrame (new Rectangle (16, 0, 16, 16), TimeSpan.FromSeconds (.25));
walkDown.AddFrame (new Rectangle (0, 0, 16, 16), TimeSpan.FromSeconds (.25));
walkDown.AddFrame (new Rectangle (32, 0, 16, 16), TimeSpan.FromSeconds (.25));
walkUp = new Animation ();
walkUp.AddFrame (new Rectangle (144, 0, 16, 16), TimeSpan.FromSeconds (.25));
walkUp.AddFrame (new Rectangle (160, 0, 16, 16), TimeSpan.FromSeconds (.25));
walkUp.AddFrame (new Rectangle (144, 0, 16, 16), TimeSpan.FromSeconds (.25));
walkUp.AddFrame (new Rectangle (176, 0, 16, 16), TimeSpan.FromSeconds (.25));
walkLeft = new Animation ();
walkLeft.AddFrame (new Rectangle (48, 0, 16, 16), TimeSpan.FromSeconds (.25));
walkLeft.AddFrame (new Rectangle (64, 0, 16, 16), TimeSpan.FromSeconds (.25));
walkLeft.AddFrame (new Rectangle (48, 0, 16, 16), TimeSpan.FromSeconds (.25));
walkLeft.AddFrame (new Rectangle (80, 0, 16, 16), TimeSpan.FromSeconds (.25));
walkRight = new Animation ();
walkRight.AddFrame (new Rectangle (96, 0, 16, 16), TimeSpan.FromSeconds (.25));
walkRight.AddFrame (new Rectangle (112, 0, 16, 16), TimeSpan.FromSeconds (.25));
walkRight.AddFrame (new Rectangle (96, 0, 16, 16), TimeSpan.FromSeconds (.25));
walkRight.AddFrame (new Rectangle (128, 0, 16, 16), TimeSpan.FromSeconds (.25));
// Standing animations only have a single frame of animation:
standDown = new Animation ();
standDown.AddFrame (new Rectangle (0, 0, 16, 16), TimeSpan.FromSeconds (.25));
standUp = new Animation ();
standUp.AddFrame (new Rectangle (144, 0, 16, 16), TimeSpan.FromSeconds (.25));
standLeft = new Animation ();
standLeft.AddFrame (new Rectangle (48, 0, 16, 16), TimeSpan.FromSeconds (.25));
standRight = new Animation ();
standRight.AddFrame (new Rectangle (96, 0, 16, 16), TimeSpan.FromSeconds (.25));
}
public void Update(GameTime gameTime)
{
var velocity = GetDesiredVelocityFromInput ();
X += velocity.X * (float)gameTime.ElapsedGameTime.TotalSeconds;
Y += velocity.Y * (float)gameTime.ElapsedGameTime.TotalSeconds;
// We can use the velocity variable to determine if the
// character is moving or standing still
bool isMoving = velocity != Vector2.Zero;
if (isMoving) {
// If the absolute value of the X component
// is larger than the absolute value of the Y
// component, then that means the character is
// moving horizontally:
bool isMovingHorizontally = Math.Abs (velocity.X) > Math.Abs (velocity.Y);
if (isMovingHorizontally) {
// No that we know the character is moving horizontally
// we can check if the velocity is positive (moving right)
// or negative (moving left)
currentAnimation = (velocity.X > 0) ? walkRight : walkLeft;
} else {
// If the character is not moving horizontally
// then it must be moving vertically. The SpriteBatch
// class treats positive Y as down, so this defines the
// coordinate system for our game. Therefore if
// Y is positive then the character is moving down.
// Otherwise, the character is moving up.
currentAnimation = (velocity.Y > 0) ? walkDown : walkUp;
}
} else {
// This else statement contains logic for if the
// character is standing still.
// First we are going to check if the character
// is currently playing any walking animations.
// If so, then we want to switch to a standing animation.
// We want to preserve the direction that the character
// is facing so we'll set the corresponding standing
// animation according to the walking animation being played.
if (currentAnimation == walkRight)
currentAnimation = standRight;
else if (currentAnimation == walkLeft)
currentAnimation = standLeft;
else if (currentAnimation == walkUp)
currentAnimation = standUp;
else if (currentAnimation == walkDown)
currentAnimation = standDown;
else if (currentAnimation == null)
currentAnimation = standDown;
}
currentAnimation.Update (gameTime);
}