//Adds a background sprite to be scrolled through the screen
public void AddBackground(string theAssetName)
{
BackGround oBackgroundSprite = new BackGround();
oBackgroundSprite.AssetName = theAssetName;
listOfBackgrounds.Add(oBackgroundSprite);
}
Viewport viewport; //The viewing area for drawing the Scrolling background images within
#endregion Fields
#region Constructors
//Constructor
public BackGround(Viewport theViewport)
{
listOfBackgrounds = new List<BackGround>();
rightMostBackground = null;
leftMostBackground = null;
viewport = theViewport;
}
/// <summary>
/// LoadContent will be called once per game and is the place to load
/// all of your content.
/// </summary>
protected override void LoadContent()
{
// Create a new SpriteBatch, which can be used to draw textures.
spriteBatch = new SpriteBatch(GraphicsDevice);
// TODO: use this.Content to load your game content here
//Initialize and add the background images to the Scrolling background.
backgrounds = new BackGround(this.GraphicsDevice.Viewport);
backgrounds.AddBackground("Background01");
backgrounds.AddBackground("Background02");
backgrounds.AddBackground("Background03");
backgrounds.AddBackground("Background04");
backgrounds.AddBackground("Background05");
//Load the content for the Scrolling background
backgrounds.LoadContent(this.Content);
//Load the content for the Player
player.LoadContent(this.Content);
//Load the content for the Score
score = Content.Load<SpriteFont>("Score");
}
//Update the positon of the background images
public void Update(GameTime theGameTime, int theSpeed)
{
//Check to see if any of the Background sprites have moved off the screen
//if they have, then move them to the right of the chain of scrolling backgrounds
foreach (BackGround oBackgroundSprite in listOfBackgrounds)
{
if (oBackgroundSprite.position.X < viewport.X - oBackgroundSprite.size.Width)
{
oBackgroundSprite.position = new Vector2(rightMostBackground.position.X + rightMostBackground.size.Width, viewport.Y);
rightMostBackground = oBackgroundSprite;
}
}
//Set the Direction based on movement to the left or right that was passed in (-1 goes right, 1 goes left)
Vector2 direction = new Vector2(-1, 0);
foreach (BackGround oBackgroundSprite in listOfBackgrounds)
{
oBackgroundSprite.Update(theGameTime, new Vector2(theSpeed, 0), direction);
}
}
public void LoadContent(ContentManager theContentManager)
{
//Clear the Sprites currently stored as the left and right ends of the chain
rightMostBackground = null;
leftMostBackground = null;
//The total width of all the sprites in the chain
float width = 0.0f;
//Cycle through all of the Background sprites that have been added
//and load their content and position them.
foreach (BackGround oBackgroundSprite in listOfBackgrounds)
{
//Load the background's content and apply it's scale, the scale is calculated by figuring
//out how far the sprite needs to be stretech to make it fill the height of the viewport
oBackgroundSprite.LoadContent(theContentManager, oBackgroundSprite.AssetName);
oBackgroundSprite.Scale = viewport.Height / oBackgroundSprite.size.Height;
if (rightMostBackground == null)
{
//Position the first Background sprite in line at the (0,0) position
oBackgroundSprite.position = new Vector2(viewport.X, viewport.Y);
leftMostBackground = oBackgroundSprite;
}
else
{
//Position the sprite after the last sprite in line
oBackgroundSprite.position = new Vector2(rightMostBackground.position.X + rightMostBackground.size.Width, viewport.Y);
}
//Set the sprite as the last one in line
rightMostBackground = oBackgroundSprite;
//Increment the width of all the sprites combined in the chain
width += oBackgroundSprite.size.Width;
}
//If the Width of all the sprites in the chain does not fill the twice the Viewport width
//then cycle through the images over and over until we have added
//enough background images to fill the twice the width.
int index = 0;
if (listOfBackgrounds.Count > 0 && width < viewport.Width * 2)
{
do
{
//Add another background image to the chain
BackGround oBackgroundSprite = new BackGround();
oBackgroundSprite.AssetName = listOfBackgrounds[index].AssetName;
oBackgroundSprite.LoadContent(theContentManager, oBackgroundSprite.AssetName);
oBackgroundSprite.Scale = viewport.Height / oBackgroundSprite.size.Height;
oBackgroundSprite.position = new Vector2(rightMostBackground.position.X + rightMostBackground.size.Width, viewport.Y);
listOfBackgrounds.Add(oBackgroundSprite);
rightMostBackground = oBackgroundSprite;
//Add the new background Image's width to the total width of the chain
width += oBackgroundSprite.size.Width;
//Move to the next image in the background images
//If we've moved to the end of the indexes, start over
index += 1;
if (index > listOfBackgrounds.Count - 1)
{
index = 0;
}
} while (width < viewport.Width * 2);
}
}
