PP-Menus: Localizing Pie Menus by Pressure

We present PP-Menus, a novel technique for enhancing the performance of pen-based interfaces. PP-Menus are pressure-based pie menus, which are implemented by using pen input pressure values to localize traditional pie menus. PP-Menus possess two states, i.e. stationary state and tracking state. A variation of pen input pressure can switch PP-Menus between the two states. A quantitative experiment shows that PP-Menus significantly outperformed tracking menus on task speed, and there was no significant difference between the two types of menus on accuracy.