Browsing by Author "Chubatyy, Roman"
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- Pen and touch interactions on graphical operationsPublication . Chubatyy, Roman; Cabral, Diogo Nuno Crespo RibeiroPen and touch input on horizontal tablet devices imitate operations on paper performed with two hands, one of them holding a pen. In the physical world, a pen held on dominant hand might be used for writing and drawing on paper, while the non-preferred hand manipulates paper to support pen gestures. Modern tablets have evolved the way, so it is possible to use pen and touch simultaneously, allowing to create new tools using such combination. Graphical tablets support multiple finger inputs, but every of them is limited to its X and Y position, while the pen also allows to measure its tilt and orientation angles relatively to tablet, and its analog pressure. Past research showed that it is possible to use hand’s thumb on the side of screen to change the actions of the pen. With pen, users are able not only to draw around the screen, but also move and copy items around, zoom them in and out, set up some of their characteristics like size and value, between others. While drawing using a pen, fingers can make various transformations for richer experience on drawing tools. In this work, the openFrameworks toolkit was used and combined with other APIs that receive and process Wacom Cintiq 13HD tablet’s pen and touch data, to create a high-fidelity user interface prototype that supports graphical operations performed with pen and fingers, separated and simultaneously. Besides of single input tasks that allow to create and transform graphical operations, there were introduced new bimanual tasks that are designed to be more natural than those with keyboard and mouse. The evaluation results show that pen and touch interactions were faster for drawing a line but slower for selecting a color, when compared with mouse interactions.