Probably an easy one: I'd like a class to have its own textures.

Probably an easy one: I'd like a class to have its own textures.

• osamaT

  Not silly at all.
  
  Here's the entire class. It's pretty small, so it'll be easy to see how everything works:
  
  class Background
  {
  
  Vector2 location, offscreen;
  Texture2D bg;
  
  public Background(GraphicsDeviceManager Device, ContentManager content)
  {
  
  location = new Vector2(0,0);
  offscreen = new Vector2(0,480);
  
  bg = content.Load<Texture2D>("background");//bg = Texture2D.FromFile(Device,"resources\\background.png");
  
  }
  
  
  public void Scroll()
  {
  
  

  //The below is commented out now so the location stays at a fixed (0,0). The
  //blue border is visible here, and if I change it to (-1,-1), you can see the blue
  //border on the bottom and right of the screen as well, as it's not drawing itself
  //to the ends.
  
  

  //location.Y += 1;
  //location.Y= location.Y % 480;
  
  
  }
  
  
  public void Draw(SpriteBatch Batch)
  {
  

  
  //Draw the background at its current location
  

  Batch.Draw(bg, location, Color.White);
  
  

  //if the background isn't at the very top of the screen, draw
  //another copy of it above so that it fills in the gap.
  

  if (location.Y > 0)
  {
  
  Batch.Draw(bg, location - offscreen, Color.White);
  
  }
  
  }
  
  
  
  }
  
  

• digioz

  Perhaps your background image is not a power of two in size. For example it's very tempting to use a 800x600 background image, only to have the graphics card resize it to 512x512 and introduce texture filtering artefacts. (only certain graphic cards will do that).
  
  
  

• Novice in C&amp;#35;

  Where are you creating an instance of background You may be creating the object before the GraphicsDevice has been created or when it is not yet ready for content loading. Can you post more code around you actually using the class along with the method you are doing it in
  
  

• Kamii47

  What are the dimensions of the Texture2D you get from loading the background image You can check this in the debugger. Maybe your background image height and width is off by one

  --Stephen

  
  

• chilakaluri

  Hey hey, thanks for that. I didn't think I'd have to do anything like that at all since the graphics and content objects were created in the constructor.
  
  Since the code is compiling and the program is working again, it does bring up another quick question that I'd rather not open another topic for.
  
  Why is it that even though I've got my background drawing to (0,0), I can still see a 1 pixel border on the top and left of my screen
  
  My Game1 Draw function clears the GraphicsDevice like so: graphics.GraphicsDevice.Clear(Color.CornflowerBlue);
  
  And when running my program, the blue border can clearly be seen even though I've got my background drawing to the absolute top left (0,0).
  
  Here's some images showing what I mean:
  http://img407.imageshack.us/img407/7572/testnm2.jpg
  http://img99.imageshack.us/img99/8051/testfa1.jpg
  
  Now, it looks like the actual green background image is only partially opaque at the edge, as you can see where the darker parts of it continue onto the cornflower blue border. Any ideas how to resolve this
  
  Thanks again.
  

• AndyJ_PS

  Maybe a silly question, but what are your location and offscreen fields set to
  
  
  

• Rei Miyasaka

  Thought I'd bump this in hopes someone might have an answer for my weirdo screen drawing problem.
  
  

• Steve Thornton

  I don't believe the graphics device has been created by the time you call it in the constructor. You should put it in the LoadGraphicsContent() method instead, because you're loading graphics content, and the device has been created by then.
  
  

• Srilatha

  Sure.
  
  I create the background instance in my Game1 constructor. Here's the code where it's being created:
  
  GraphicsDeviceManager graphics;
  ContentManager content;
  
  Background background;
  
  public Game1()
  {
  graphics = new GraphicsDeviceManager(this);
  content = new ContentManager(Services);
  
  background = new Background(graphics,content);
  
  }
  
  
  From there my code is pretty much identical to the XNA scrolling background example.
  
  
  
  
  

• coco250

  The Draw() method in Game1 has this:
  
  //this draws the background
  backBatch.Begin();
  
  

  background.Draw(backBatch);
  

  
  backBatch.End();
  
  And the Draw() method in my Background class looks like this:
  
  public void Draw(SpriteBatch Batch)
  {
  
  Batch.Draw(bg, location, Color.White);
  
  if (location.Y > 0)
  {
  
  Batch.Draw(bg, location - offscreen, Color.White);
  
  }
  
  }
  
  
  

• me&amp;#42;

  How are you drawing the background
  
  
  
• Probably an easy one: I'd like a class to have its own textures.