MULTI-TOUCH MANIPULATION OF APPLICATION OBJECTS

摘要

The manipulation system described herein provides a common platform and application-programming interface (API) for applications to communicate with various multi-touch hardware devices, and facilitates the interpretation of multi-touch input as one or more manipulations. Manipulations map more directly to user intentions than do individual touch inputs and add support for basic transformation of objects using multiple touch contacts. An application can use manipulations to support rotating, resizing, and translating multiple objects at the same time. The manipulation system outputs two-dimensional (2D) affine transforms that contain rotation, scale, and translation information. Thus, using the manipulation system the application author can focus more on building touch-capable applications and let the manipulation system handle the underlying transformations and communication with the multi-touch hardware.

主权项

1. A computer-implemented method associated with generating a manipulation event, the computer-implemented method comprising:
receiving, from an application executing on a computing device having a touch-sensitive input surface, via a manipulation application programming interface, a plurality of touch inputs, the plurality of touch inputs corresponding to a plurality of touches previously directed to the application; interpreting, after being received via the manipulation application programming interface, the received plurality of touch inputs into at least one corresponding manipulation event, the at least one corresponding manipulation event representing at least one manipulation based on relative movements of the plurality of touches on the touch-sensitive input surface; and providing, via the manipulation application programming interface, the at least one corresponding manipulation event to the application.