《追踪球》是一款简单的休闲益智游戏。游戏中考验玩家的观察，反应和操作的准确性，玩家将控制自己蓝色的小球进行躲避其他颜色的小球，白色的小球按照正常的桌球弹射角度不断运行，红色的小球则会有追踪功能，你只能不断运行来躲避其他小球。
用绩效指数比较了不同指点装置的操作绩效，对追踪球的优化设计提出了建议。
According to index of performance, the operation performance of different pointing devices was compared. The implication of the results to the optimal ergonomic design of trackball was also discussed.
用绩效指数比较了不同指点装置的操作绩效，对追踪球的优化设计提出了建议。
According to index of performance, the operation performance of different pointing devices was compared.
目标速度影响鼠标、食指操作追踪球和拇指操作追踪球等指点装置的操作可控性、稳定性和疲劳度。
Target speed has an effect on the operating controllability, stability and fatigue degree of mouse, and the index finger operating and thumb operating trackballs.
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