目标点击操作中不同方向对笔压性能影响的研究

Empirical Study of Direction Effect on Pen Pressure Performance in Pointing Tasks

在基于Fitts定理的目标点击任务中,不同的操作方向可能会对笔尖压力的使用性能产生影响,但Fitts定理却忽视了对方向因素的考察。因此,采用实证研究方法设计了两类方向,一类是矩形条菜单方向(北-南,西-东,东北-西南和东南-西北),另一类是压力增减方向(分别在4种方向的矩形条菜单上逐步增大压力(Pressure Increase)或逐步减小压力(Pressure Decrease)来选择两个目标,分别称之为PI Pointing和PD Pointing操作),考察了在基于Fitts定理的点击任务中不同方向对笔压使用性能的影响。实验要求12名实验者依次获取并选择矩形条上的两个不同间距和不同大小的目标。实验结果表明,不同的压力增减方向对笔压的使用性能有影响,而不同的矩形条菜单方向对笔压的使用性能没有显著性差异。本研究对基于笔压使用的用户交互界面设计具有帮助和指导作用。

Direction may have an effect on the performance of pen pressure in pointing tasks, but the impact factor is not considered in Fitts＇ Law. To investigate whether directions have an influence on the performance of the pen pressure in pointing operations, we designed the experiment which contains two kinds of directions. One is made up of four rectangular menus with different directions （North-South, West-East, Northeast-Southwest and Northwest-Southeast）. The other is pressure direction. The participants increase pen pressure or decrease pen pressure to select the targets on the rectangular menu, and we refered to as PI Pointing and PD Pointing, respectively. Twelve participants are required to obtain and select two targets which have different distances （100,200,300 pixels） and different widths （20,30,40 pixels） on rectangular menus. Experimental results show that the pressure direction has an impact on pressure efficiency, while the different menu directions have no significant effect. The findings of this study will be useful for human-oriented pen pressure use in user interface designs.