code: protected Point computeLocation(Rectangle viewport, Rectangle controls)
      {
          double x;
          double y;
  
          if (this.locationCenter != null)
          {
              x = this.locationCenter.x - controls.width / 2;
              y = this.locationCenter.y - controls.height / 2;
          }
          else if (this.position.equals(AVKey.NORTHEAST))
          {
              x = viewport.getWidth() - controls.width - this.borderWidth;
              y = viewport.getHeight() - controls.height - this.borderWidth;
          }
          else if (this.position.equals(AVKey.SOUTHEAST))
          {
              x = viewport.getWidth() - controls.width - this.borderWidth;
              y = 0d + this.borderWidth;
          }
          else if (this.position.equals(AVKey.NORTHWEST))
          {
              x = 0d + this.borderWidth;
              y = viewport.getHeight() - controls.height - this.borderWidth;
          }
          else if (this.position.equals(AVKey.SOUTHWEST))
          {
              x = 0d + this.borderWidth;
              y = 0d + this.borderWidth;
          }
          else // use North East as default
          {
              x = viewport.getWidth() - controls.width - this.borderWidth;
              y = viewport.getHeight() - controls.height - this.borderWidth;
          }
  
          if (this.locationOffset != null)
          {
              x += this.locationOffset.x;
              y += this.locationOffset.y;
          }
  
          return new Point((int) x, (int) y);
      }
docs: Compute the screen location of the controls overall rectangle bottom right corner according to either the
  location center if not null, or the screen position.
  
  @param viewport the current viewport rectangle.
  @param controls the overall controls rectangle
  
  @return the screen location of the bottom left corner - south west corner.