[Solved] Question: Proper Way to Move with Delta Time

I have declared the following variables so I can move my player around:

private double player1Y = 0;
private const int PLAYER_SPEED = 200;

In my Update function, I move the player like so:

protected override void Update(GameTime gameTime)
    double deltaTime = gameTime.ElapsedGameTime.TotalSeconds;

    if (Keyboard.GetState().IsKeyDown(Keys.Up))
        player1Y += -PLAYER_SPEED * deltaTime;
    else if (Keyboard.GetState().IsKeyDown(Keys.Down))
        player1Y += PLAYER_SPEED * deltaTime;


I then draw my player based on their position:

protected override void Draw(GameTime gameTime)

    // NOTE: `whiteRectangle` is just a simple `Texture2D`.
    spriteBatch.Draw(whiteRectangle, new Rectangle(0, Convert.ToInt32(player1Y), PLAYER_WIDTH, PLAYER_HEIGHT), Color.White);



While everything seems to work as intended, I have a feeling of unease that I am doing something wrong, particularly with how I am converting my player’s Y position (a double) into an int at Draw time, and how I am using double instead of int for my player’s position.

I only intend to draw my player’s position in whole numbers because I’m trying to make a simple pixel Pong clone, but since deltaTime isn’t a whole number I thought using double would make things easier.

Is there something wrong with what I am doing, or is everything just fine the way they are?

No, I don’t think so, all that happens is your double will be rounded to the nearest Int.

1 Like

I see, that’s a relief! :smile:
Closing this question now then! :slightly_smiling_face: