Top & Bottom Box Calculation

I need to do a simple indicator.

How it works?
1. I am able to set the start time and end time.
2. It will draw a top box, a box that is from open to the highest candle in that time frame. So if 2nd candle since open is high, it will draw till there. Then if 4th candle is even higher, it will draw till 4th candle high.
- I can set box color.
3. It will draw a bottom box, a box that is from the open to the lowest candle in that time frame. Same as top box the drawing box.
- I can set box color.
4. The difference between open and highest candle will be displayed.
- I can set location corner of display and x/y coordinate.
5. The difference between open and lowest candle will be displayed.
- I can set location corner of display and x/y coordinate.

It will draw this top and bottom box for every time frame set.

Or probably draw a horizontal line like hanover's indicator but added with the open price for start time horizontal line.

http://www.forexfactory.com/showthread.php?t=256848

Thanks in advance.