0 a ball on a computer mouse or keyboard that you roll with your finger in order to move the cursor on the screen:
The icons are generally activated by an on-screen pointer controlled by a mouse or trackball.
Two large buttons sit on either side of the trackball and replicate the left and right mouse buttons.
The idea was to grasp the stick in the palm of the hand and manipulate the trackball with the thumb.
Since this mouse is an optical mouse, the mouse fails when sufficient sunlight leaks into the trackball.
For each image, the perimeters of the right ventricular cavity were traced using an off-line trackball algorithm.
Efficient controls, those with a high ratio of degrees of freedom to selection overhead, are: touchpads, trackball; spaceball; motion-tracking glove.
However, when used outdoors in bright sunlight, we often had to shade the trackball with the user's second hand in order for it to function properly.
Together with light pens and trackballs, it was offered as optional input device for their system since 1968.
中文繁体
(電腦鍵盤上操控游標的)軌跡球…
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(电脑键盘上操控光标的)轨迹球…
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trackball…
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trackball, manipulatorkulkowy…
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