On-Line Computer Graphics Notes

Screen Space

Screen space is defined to be the square -1 < x,y < 1, z=0 in the xy plane.

For a postscript version of these notes look here.

To map this area onto device space, we overlay the device-space pixel array onto the screen-space area, as is shown below.

If we are given an array of pixels, the the corresponding width and height of a pixel is units in screen space. The four corners of the th pixel are given by

Given a point in screen space, the pixel that corresponds to the point is calculated by first converting the point to device-space coordinates, and then taking the floor of each.

This document maintained by Ken Joy Comments to the Author All contents copyright (c) 1996, 1997 Computer Science Department, University of California, Davis All rights reserved.