extending a graphical toolkit for two-handed interaction
Multimodal interaction combines input from multiple sensors such as pointing devices or speech recognition systems, in order to achieve more fluid and natural interaction. Two-handed interaction has been used recently to enrich graphical interaction. Building applications that use such combined interaction requires new software techniques and frameworks. Using additional devices means that user interface toolkits must be more flexible with regard to input devices and event types. The possibility of parallel interactions must also be taken into account, with consequences on the structure of toolkits. Finally, frameworks must be provided for the combination of events and status of several devices. This paper reports on the extensions we made to the direct manipulation interface toolkit Whizz in order to experiment two-handed interaction. These extensions range from structural adaptations of the toolkit to new techniques for specifying the time-dependent fusion of events.
graphics graphical toolkit toolkit two-handed interaction interaction multimodal interaction combinational input sensor pointing device device speech recognition systems order natural interaction use applications software interfaces flexibility input devices event types parallel account structure paper extensibility direct manipulation experience fusion  framework  user-interface toolkit timing interaction styles dependencies