Viewport

acrylic plastic viewports in pressure vessels for human occupancy

Dragging the scroll-bar changes which part of the picture is visible within the viewport.

Some general ideas on clipping, viewporting, and windowing can be found in Rogers and Adams.

Viewporting is an operation that takes the portion of the picture that has been mapped into the square region delimited by -1,+1,-1,+1 and further maps it into a rectangular subregion of the screen (a viewport).

The main thing I want you to take away from this chapter is knowing where to start and creating a very simple viewported web site using nothing more than an extra <meta> tag and simple HTML.