1. A graphical image conversion component of a diagrammatic programming environment, for converting a region of a wide-angle image into a rectilinear image, the conversion component comprising: a first input data interface configured to receive the wide-angle image; a second input data interface configured to receive selected pan and tilt parameters that cause the image conversion component to select a region of the wide-angle image to convert; and an output data interface configured to transmit a rectilinear image constructed from the specified region, the rectilinear image including a number of pixels, each pixel constructed from one or more corresponding pixels in the wide-angle image.