Comparison With Other Interaction Techniques
Pie menus are faster and more reliable to select from than linear menus, because selection depends on direction instead of distance. The circular menu slices are large in size and near the pointer for fast interaction (see Fitts's law). Experienced users use muscle memory without looking at the menu while selecting from it. Nested pie menus can efficiently offer many options, and some pie menus can pop up linear menus, and combine linear and radial items in the same menu. Pie menus just like any popup menu are shown only when requested, resulting in less visual distraction and cognitive load than toolbars and menu bars that are always shown.
Pie menus show available options, in contrast to invisible mouse gestures. Pie menus, which delay appearance until the pointer is not moving, reduce intrusiveness to the same level as mouse gestures for experienced users. Pie menus take up more screen space than linear menus, and the number of slices in an individual menu must be kept low for effectiveness by using submenus. When using pie menus, submenus may overlap with the parent menu, but the parent menu may become translucent or hidden.
Pie menus are most suited for actions that have been laid out by humans, and have logical grouping choices. Linear menus are most suited for dynamic, large menus that have many possible options, without any logical grouping, since pie menus can only show a limited number of menu items. Around 3-12 items can be reasonably accommodated in a radial layout, but additional items past that tend to counteract the benefits of using pie menus in the first place. This can be overcome with related techniques that allow chaining commands in one single gesture through submenus.
However, using interaction techniques that are not pointer based have proven problematic with both pie and linear menus.
Pie menus are unavailable as standard widgets in common commercial toolkits. Video games often require custom widget development, so pie menu cost is lower in that particular scenario.
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