| 摘要 |
A touch controlled zoom and pan of graphic displays is achieved using only a touch screen and rotary knob by designating various areas on a touch screen. Touching one of the designated areas determines the function to be performed-zoom along one axis or in two dimensions or pan along one axis or in two dimensions. The zoom or pan is then performed in response to the rotation of a rotary encoder knob. For panning dragging the touch along an axis in lieu of rotating the rotary encoder knob performs the function. Alternatively the same designated areas may be used to determine either the zoom or pan function by using either a "touch and hold" technique for zoom or a "touch and go" technique for pan.
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