![]() These numbers can be used to control attributes of elements on screen. The cursor position is read by computer programs as two numbers, the x-coordinate and the y-coordinate. The physical mouse object is used to control the position of the cursor on screen and to select interface elements. In Engelbart's original patent application in 1970 he referred to the mouse as an "X-Y position indicator," and this still accurately, but dryly, defines its contemporary use. The design of the mouse has gone through many revisions in the last forty years, but its function has remained the same. ![]() The mouse concept was further developed at the Xerox Palo Alto Research Center (PARC), but its introduction with the Apple Macintosh in 1984 was the catalyst for its current ubiquity. The computer mouse dates back to the late 1960s, when Douglas Engelbart presented the device as an element of the oN-Line System (NLS), one of the first computer systems with a video display. ![]() We control elements on screen through a variety of devices such as touch pads, trackballs, and joysticks, but the keyboard and mouse remain the most common input devices for desktop computers. The screen forms a bridge between our bodies and the realm of circuits and electricity inside computers. If you see any errors or have comments, please This tutorial was originally written for Processing version 2.0+ but has been ported and updated here for P5 by Alex Yixuan Xu. This is based on the Interactivity chapter from the second edition of Processing: A Programming Handbook for Visual Designers and Artists, published by MIT Press.
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