Box me in

My project is more about interface rather than totally new functionality. If you have ever searched for a restaurant on google or yelp or any service you can look by neighborhood or by radius from a location, but you can never just specify where you want to search. There's a lot of soft boundaries that come into play when picking a place to go. For example, oh i want to go to the east side, but i don't want to go all the way to alphabet city. Or i want to go to midtown, but not north of 39th. My idea is to make a tool that allows you to draw a polygon that you can search inside of. This way you don't get any unwanted results and you can search more accurately.