Methods of user-centered design are used to ensure that the visual language introduced in the design is well tailored to the tasks. Its goal is to enhance the efficiency and ease of use for the underlying logical design of a stored program, a design discipline known as usability. "Designing the visual composition and temporal behavior of GUI is an important part of software application programming in the area of human-computer interaction. The example "Design elements - iPhone interface" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Graphic User Interface solution from the Software Development area of ConceptDraw Solution Park. Internal accelerometers are used by some applications to respond to shaking the device (one common result is the undo command) or rotating it in three dimensions (one common result is switching from portrait to landscape mode)." Interaction with the OS includes gestures such as swipe, tap, pinch, and reverse pinch, all of which have specific definitions within the context of the iOS operating system and its multi-touch interface. Interface control elements consist of sliders, switches, and buttons. "The user interface of iOS is based on the concept of direct manipulation, using multi-touch gestures. The vector stencils library "iPhone interface" contains 119 design elements for development of graphic user interface (GUI) for iPhone software applications.
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