Want to implement rectangle selection without zoom.

[kaushikdeo]

firstly awesome job on the plugin. Its really helpful.

Below is the functionality for which i need some help and/or clarifications

1. Should be able to drag and draw a selection rectangle ( this is happening)
2. once the rectangle is drawn i want to know the start and end of the xaxis points
3. I dont want to zoom the chart but use the xaxis start and end points to do some calculations
4. I also want the selection rectangle to persist
5. show the calculations in a box

Can someone guide me on this?