Two-dimensional emulation of three-dimensional trackball

Details Two-dimensional emulation of three-dimensional trackball Two-dimensional emulation of three-dimensional trackball

G - Physics

06

F

354/236.2

G06F 3/033 (2006.01) G06F 15/72 (1990.01)

Patent

CA 1320283

TWO-DIMENSIONAL EMULATION OF THREE-DIMENSIONAL TRACKBALL ABSTRACT OF THE DISCLOSURE A technique using a 2-dimensional input controller such as a mouse, a 2-D trackball, a joystick, a touch screen, a touch tablet or a digitizer for rotating an object displayed by a computer controlled video display system in 3-dimensional representation. A user visible reference circle is provided, and a pointer associated with the 2-D input controller is moved by the user rela- tive to the reference circle in a control movement mode. Movement of the pointer within the reference circle produces rotation of the displayed object about arbitrary axes in 3-dimensional space, while movement of the pointer on or outside the reference circle produces rotation about a 3-dimensional axis that is oriented toward the viewer.

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