What is trackball ?
| Trackball Pointing Device |
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Essentially, a trackball is a mouse lying on its back. To move the pointer, you rotate the ball with your thumb, your fingers, or the palm of your hand. There are usually one to three buttons next to the ball, which you use just like mouse buttons. The advantage of trackballs over mice is that the trackballs stationary so it does not require much space to use it. In addition, you can place a trackball on any type of surface, including your lap. For both these reasons, trackballs are popular pointing devices for portable computers. A popular pointing device that can be roughly described as a mouse on its back. Trackballs consists of a ball resting on two rollers at right angles to each other, which translates the ball's motion into vertical and horizontal movement on the screen. A trackballs also typically has one or more buttons to initiate other actions. The only functional difference between a mechanical mouse and a trackball is in how the ball is moved: With a mouse, the ball is rolled by moving the entire unit over a desktop or other surface; with a trackball, the housing is stationary, and the ball is rolled with the hand. A trackballs useful for fine work, because the user can exert fingertip control; a mouse is better for bold moves, such as those used in navigating within a graphical user interface. |
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