Disambiguation Canvas
Also known as DCanvas
A phone's orientation aims a sphere or cone at the target area; touching the screen lays all the objects caught out on a flat canvas mapped one-to-one to the touchscreen, and sliding the thumb onto the target and lifting selects it in one step.
How it works
In an HMD with an iPhone or iPod Touch, the device orientation points a 12° sphere or cone. On touch, the pre-selected objects animate (250 ms) into a grid on a rectangle parallel to the image plane, laid out within the thumb's comfortable reach (with a calibration of each user's reach); an arrow follows the thumb, and lifting off over an object selects it, or over empty space cancels. Against orientation-based raycasting (6 participants) it was slightly slower overall (2.37 s vs 2.29 s) but far more accurate and faster for the smallest targets; against SQUAD (11 participants) it was faster at every density, with hundreds of candidates handled in one step.
Papers
- Henrique G. Debarba, Jerônimo G. Grandi, Anderson Maciel, Luciana Nedel, Ronan Boulic (2013). Disambiguation Canvas: A Precise Selection Technique for Virtual Environments. Human-Computer Interaction – INTERACT 2013, LNCS 8119, 388-405 doi:10.1007/978-3-642-40477-1_24