Gaze-supported foot interaction in zoomable information spaces.

When working with zoomable information spaces, we can distinguish complex tasks into primary and secondary tasks (e.g., pan and zoom). In this context, a multimodal combination of gaze and foot input is highly promising for supporting manual interactions, for example, using mouse and keyboard. Motivated by this, we present several alternatives for multimodal gaze-supported foot interaction in a computer desktop setup for pan and zoom. While our eye gaze is ideal to indicate a user's current point of interest and where to zoom in, foot interaction is well suited for parallel input controls, for example, to specify the zooming speed. Our investigation focuses on varied foot input devices differing in their degree of freedom (e.g., one- and two-directional foot pedals) that can be seamlessly combined with gaze input.