CS349 Lecture Notes - Lecture 2: Rotation Matrix, Scrollbar, Input Device
12 May 2015
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Document Summary
1 vector ui: the translation matrix is. We can use multiplicative vectors to translate, shift, or rotate our objects. A widget is a generic name for a part of an interface with its own behaviour. They tend to have their own appearance, their own purpose, and can be pretty much anything (ie. a scrollbar, a button, a textbox). A logical input device is a graphical component de ned by a function rather than by what it looks like. Each devices transmits a set of primitives: locator: an (x,y)-position, pick: identi es a displayed object, choice: selects from a set of alternatives, valuator: inputs a value, string: inputs a string of characters, stroke: inputs a sequence of positions. The primitives are abstracted away so that widgets do not need to handle multiple inputs types, eg. keyboards and voice-recognition. A widget may be considered a logical input device with an appearance.
