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:
“We have heard all of our lives how, after the Civil War was over, the South went back to straighten itself out and make a living again. It was for many years a voiceless part of the government. The balance of power moved away from it—to the north and the east. The problems of the north and the east became the big problem of the country and nobody paid much attention to the economic unbalance the South had left as its only choice.”
—Lyndon Baines Johnson (1908–1973)
“Our young people are diseased with the theological problems of original sin, origin of evil, predestination, and the like. These never presented a practical difficulty to any man,—never darkened across any man’s road, who did not go out of his way to seek them. These are the soul’s mumps, and measles, and whooping- coughs, and those who have not caught them cannot describe their health or prescribe a cure. A simple mind will not know these enemies.”
—Ralph Waldo Emerson (1803–1882)
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—Hortense Odlum (1892–?)