Problems
A common problem of pointing sticks is the inability to identify the zero position (the position indicating no user touch). A typical solution, which reflects the fact that user operation of the pointing stick is rarely constant, is to interpret any absence of change of pressure (over a given interval, perhaps one or several seconds) as meaning the user has released the stick.
If the user applies exactly constant pressure to the stick for such an interval, this method mistakenly re-zeroes the stick. Then additional pressure is required to achieve the same movement of the screen cursor, and the cursor spontaneously moves in the opposite direction when the user releases the stick. If the user avoids touching the stick, the error ends when the stick detects the real zero position.
Read more about this topic: Pointing Stick
Famous quotes containing the word problems:
“I am always glad to think that my education was, for the most part, informal, and had not the slightest reference to a future business career. It left me free and untrammeled to approach my business problems without the limiting influence of specific training.”
—Alice Foote MacDougall (1867–1945)
“I’m no good at being noble, but it doesn’t take much to see that the problems of three little people don’t amount to a hill of beans in this crazy world. Someday you’ll understand that.”
—Julius J. Epstein, U.S. screenwriter, Philip Epstein, screenwriter, Howard Koch, screenwriter, and Michael Curtiz. Rick Blaine (Humphrey Bogart)
“One of the annoying things about believing in free will and individual responsibility is the difficulty of finding somebody to blame your problems on. And when you do find somebody, it’s remarkable how often his picture turns up on your driver’s license.”
—P.J. (Patrick Jake)