Using large, direct-touch displays, a non-photorealistic painting is
made interactive, allowing the work with many strokes simultaneously.
The essential difference to previous systems is that users can modify
strokes even after they have been placed. This is achieved using a
hybrid approach that takes the visual richness of pixel images and the
flexibility of vector graphics. The implementation is based on the Display Framework that is being developed at the Innovis
research group at the Interactions
Lab of the University of Calgary. To enable a broad range of users to interact expressively and intuitively with stroke-based non-photorealistic renderings, novel interaction techniques for large displays have been developed. Interaction techniques based on hand postures allow users to expressively explore the creation process of a non-photorealistic painting. Two bimanual interaction techniques use the Nintendo Wii Remote Controller in conjunction with the Nintendo Nunchuk to allow users a seamless transition between interaction at a distance and interaction up close on large displays. Furthermore, a set of hand postures to interact with stroke-based
rendering on touch-sensitive large displays was developed. In contrast to
traditional WIMP interfaces, this allows to directly engage with and
influence a rendering. The resulting system allows the creation, distribution and manipulation stroke
primitives. The interaction technique was later used for interactive exploratory visualization of 2D vector fields. Video:
Images:  Bimanual interaction via Direct Touch and the Nintendo Nunchuk.   User-sketched primitives enable artists to create a wide variety of 2D shapes.  An example image created within 15 minutes with the bimanual interaction techniques. Poster (presented at EG 2008):  Publications:
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