Draw 2D line in XNA using a streched 1x1 sprite

gistfile1.cs

  Texture2D t; //base for the 


  protected override void LoadContent()
  {
      // create 1x1 texture for line drawing
      t = new Texture2D(GraphicsDevice, 1, 1);
      t.SetData<Color>(
          new Color[] { Color.White });// fill the texture with white
  }


  protected override void Draw(GameTime gameTime)
  {
      GraphicsDevice.Clear(Color.CornflowerBlue);

      spriteBatch.Begin();
      DrawLine(spriteBatch, //draw line
          new Vector2(100, 100), //start of line
          new Vector2(500, 500) //end of line
      );
      spriteBatch.End();



      base.Draw(gameTime);
  }


  void DrawLine(SpriteBatch sb, Vector2 start, Vector2 end)
  {
      Vector2 edge = end - start;
      // calculate angle to rotate line
      float angle = 
          (float)Math.Atan(edge.Y / edge.X);
      if (edge.X < 0)
          angle = MathHelper.Pi + angle;


      sb.Draw(t,
          new Rectangle(// rectangle defines shape of line and position of start of line
              (int)start.X, 
              (int)start.Y, 
              (int)edge.Length(),
              1), //width of line, change this to make thicker line
          null,
          Color.Red, //colour of line
          angle,     //angle of line (calulated above)
          new Vector2(0, 0), // point in line about which to rotate
          SpriteEffects.None,
          0);
  }