A common application of coordinate dilations is displaying digital images on a computer monitor.
A computer monitor, or computer screen, contains a certain amount of pixels. A pixel is a point on the monitor that lights up with a particular color, depending on the program that is being run.
Pixels are given a location using Quadrant I of a coordinate plane. Computer programs use x- and y-coordinates to locate each pixel and assign it a particular color.
For example, the monitor shown in the picture has a horizontal dimension of 1366 pixels and a vertical dimension of 768 pixels. Each pixel on the monitor can be used to generate an image.
The pixel shown is 1200 pixels from the left-hand corner, or origin, and 721 pixels above the left-hand corner, or origin. It is the pixel located at the ordered pair (1200, 721).
Let’s see this in action. Adan is a computer programmer, and he wants to generate an animation sequence by enlarging a figure whose outline is the trapezoid shown on the graph below. He is using a computer monitor like the one shown before, with a horizontal dimension of 1366 pixels and a vertical dimension of 768 pixels. His computer screen and the outline of the image are shown on the graph below.