Print view or export to PDF

I am using OpenLayers Tile layer fot my map application. I have WMS layers on map like this:

• Parcels,


• Streets,


• Buildings,


• Gas Pipes,

I zoom to somewhere on map that all layers are visible. I want to select a region within a rectangle and get view as an image. After get image, I want to put it to PDF. How can I do this?