Browsing by Author "Chen, X."

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    Body-Centric Interaction: Using the Body as an Extended Mobile Interaction Space.
    (2011) Chen, X.; Tang, A.; Boring, S.; Greenberg, S.
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    The Fat Thumb: Using the Thumb's Contact Size for Single-Handed Mobile Interaction.
    (ACM, 2012) Boring, S.; Ledo, D.; Chen, X.; Marquardt, N.; Tang, A.; Greenberg, S.
    Modern mobile devices allow a rich set of multi-finger interactions that combine modes into a single fluid act, for example, one finger for panning blending into a two-finger pinch gesture for zooming. Such gestures require the use of both hands: one holding the device while the other is interacting. While on the go, however, only one hand may be available to both hold the device and interact with it. This mostly limits interaction to a single-touch (i.e., the thumb), forcing users to switch between input modes explicitly. In this paper, we contribute the Fat Thumb interaction technique, which uses the thumb's contact size as a form of simulated pressure. This adds a degree of freedom, which can be used, for example, to integrate panning and zooming into a single interaction. Contact size determines the mode (i.e., panning with a small size, zooming with a large one), while thumb movement performs the selected mode. We discuss nuances of the Fat Thumb based on the thumb's limited operational range and motor skills when that hand holds the device. We compared Fat Thumb to three alternative techniques, where people had to precisely pan and zoom to a predefined region on a map and found that the Fat Thumb technique compared well to existing techniques.
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    The Fat Thumb: Using the Thumb’s Contact Size for Single-Handed Mobile Interaction
    (2011) Boring, S.; Ledo, D.; Chen, X.; Tang, A.; Greenberg, S.
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    SPALENDAR: Visualizing a Group's Calendar Events over a Geographic Space on a Public Display
    (ACM, 2012) Chen, X.; Boring, S.; Carpendale, S.; Tang, A.; Greenberg, S.
    Portable paper calendars (i. e., day planners and organizers) have greatly influenced the design of group electronic calendars. Both use time units (hours/days/weeks/etc.) to organize visuals, with useful information (e.g., event types, locations, attendees) usually presented as - perhaps abbreviated or even hidden - text fields within those time units. The problem is that, for a group, this visual sorting of individual events into time buckets conveys only limited information about the social network of people. For example, people's whereabouts cannot be read 'at a glance' but require examining the text. Our goal is to explore an alternate visualization that can reflect and illustrate group members' calendar events. Our main idea is to display the group's calendar events as spatiotemporal activities occurring over a geographic space animated over time, all presented on a highly interactive public display. In particular, our Spalendar (Spatial Calendar) design animates people's past, present and forthcoming movements between event locations as well as their static locations. Detail of people's events, their movements and their locations is progressively revealed and controlled by the viewer's proximity to the display, their identity, and their gestural interactions with it, all of which are tracked by the public display.