Concepts inAcquiring and pointing: an empirical study of pen-tilt-based interaction
Pen computing
Pen computing refers to a computer user-interface using a pen and tablet, rather than devices such as a keyboard, joysticks or a mouse. Pen computing is also used to refer to the usage of mobile devices such as wireless tablet personal computers, PDAs and GPS receivers. The term has been used to refer to the usage of any product allowing for mobile communication.
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Interaction technique
An interaction technique, user interface technique or input technique is a combination of hardware and software elements that provides a way for computer users to accomplish a single task. For example, one can go back to the previously visited page on a Web browser by either clicking a button, pressing a key, performing a mouse gesture or uttering a speech command. It is a widely-used term in human-computer interaction.
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Fitts's law
Fitts' law (often cited as Fitts's law) is a model of human movement primarily used in human¿computer interaction and ergonomics that predicts that the time required to rapidly move to a target area is a function of the distance to the target and the size of the target. Fitts's law is used to model the act of pointing, either by physically touching an object with a hand or finger, or virtually, by pointing to an object on a computer monitor using a pointing device.
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Modality (human¿computer interaction)
In human¿computer interaction, a modality is the general class of: a sense through which the human can receive the output of the computer (for example, vision modality) a sensor or device through which the computer can receive the input from the human In less formal terms, a modality is a path of communication between the human and the computer. When multiple modalities are available for some tasks or parts of tasks, the system is said to have overlapping modalities.
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Angle
In geometry, an angle is the figure formed by two rays, called the sides of the angle, sharing a common endpoint, called the vertex of the angle. Angles are usually presumed to be in a Euclidean plane, but are also defined in non-Euclidean geometry. Angle is also used to designate the measure of an angle or of a rotation. This measure is the ratio of the length of a circular arc by its radius. In the case of an angle (figure), the arc is centered at the vertex and delimited by the sides.
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Angular diameter
The angular diameter or apparent size of an object as seen from a given position is the ¿visual diameter¿ of the object measured as an angle. In the vision sciences it is called the visual angle. The visual diameter is the diameter of the perspective projection of the object on a plane through its centre that is perpendicular to the viewing direction. Because of foreshortening, it may be quite different from the actual physical diameter for an object that is seen under an angle.
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Pen tilt
Pen tilt refers to the angle of the writing instrument during the handwriting process, which can vary over time.
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Power (physics)
In physics, power is the rate at which energy is transferred, used, or transformed. For example, the rate at which a light bulb transforms electrical energy into heat and light is measured in watts¿the more wattage, the more power, or equivalently the more electrical energy is used per unit time. Energy transfer can be used to do work, so power is also the rate at which this work is performed.
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