CapTUI: Geometric Drawing with Tangibles on a Capacitive Multi-touch Display

Abstract

Abstract. We present CapTUI, an innovative drawing tool that detects tangible drawing instruments on a capacitive multi-touch tablet. There are three core components to the system: the tangible hardware, the recognizer used to identify the tangibles and the drawing software that works in tandem with the tangibles to provide intelligent visual drawing guides. Our recognizable tangible drawing instruments are a ruler, protractor and set square. Users employ these familiar physical instruments to construct digital ink drawings on a tablet in an intuitive and engaging manner. The visual drawing guides enhance the experience by offering the user helpful cues and functionalities to assist them to draw more accurately. A user evaluation comparing CapTUI to an application with passive tools showed that users significantly preferred CapTUI and found that the visual guides provide greater accuracy when drawing.

New Interaction Tools for Preserving an Old Language

“…We initially implemented a recognition algorithm based on [3] but found it was overly complex for the problem space. Three touch points are more than sufficient for the number of tangibles required therefore we use simpler triangulation techniques.…”

“…We must adopt technology and techniques that will work in a remote rural environment [2]. There have been a number of projects that have explored using tangibles on capacitive tablets [3,16,27,36]. These tangibles work by transmitting an electrical charge from the user through touch points on the tangible to the capacitive display [1].…”

Designing Digital Solutions for Preserving Penan Sign Language: A Reflective Study

“…Capacitive sensing tangibles linked with 2D graphics were explored as a novel concept for teaching Oroo' signs in this project. Tangible technologies that enable interaction on capacitive multitouch devices, such as iPad and iPhone, have proved their utility in a wide range of application scenarios including learning with toddlers [23][24][25]. Capacitive multitouch surfaces work as a natural site for interaction with physical objects without requiring any hardware modifications.…”

Concepção de uma Família de Gestos para Construção de Objetos Geométricos e sua Utilização em um Sistema de Geometria Interativa para Dispositivos Móveis: GeoTouch

“…Além destes, destaca-se também o estudo conduzido por de Blagojevic et al [25] onde são explorados o desenho de objetos geométricos por meio de ferramentas tradicionais como régua, compasso ou transferidor na superfície da tela do tablet. Apesar deste estudo não ser exclusivamente sobre softwares de GI, os autores enfatizam que esta ferramenta pode também ser utilizada para o ensino da geometria utilizando figuras interativas.…”