Second Touch Zoom Control Maintaining Selection During Pinch Operations
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Solution Overview
Problem
Existing touch-screen zoom controls, such as pinch-zoom, require two fingers to function, which prevents zooming while maintaining control of a displayed selection or point, as a second finger touch separates the first finger from ongoing actions.
Innovation Solution
A second touch zoom control where a first finger establishes a hotspot or selection, and a second finger, placed before the first is lifted, controls zoom by moving away to zoom in or towards to zoom out, with the zoom centered around the first finger, allowing continuous control of the selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional pinch-zoom control is used, then zoom function is achieved, but control of displayed selection or point is lost
Solution Approach 1:
The patent divides the two-finger touch interaction into distinct functional roles: the first finger maintains selection control while the second finger independently controls zoom. This segmentation allows each finger to perform its specific function without interfering with the other, resolving the contradiction between zoom control and selection control continuity.
Solution Approach 2:
The first finger serves multiple functions: it establishes the zoom center point and maintains continuous selection control throughout the zoom operation. This multi-functionality allows the system to achieve both zoom and selection control without requiring separate controls for each function.
2Ease of operation
If two fingers are used for pinch-zoom, then zoom is achieved, but the first finger is separated from ongoing actions
Solution Approach 1:
The system establishes the first finger's position as the zoom center point before the zoom operation begins. This preliminary action ensures that the first finger remains anchored to the selection throughout the zoom process, preventing control interruption and allowing continuous interaction with the selected element.
3Ease of operation
If zoom is centered on midpoint between fingers, then traditional pinch-zoom works, but selection location changes
Solution Approach 1:
The patent applies different quality characteristics to different parts of the touch interaction: the first finger's position determines the zoom center and remains fixed to maintain selection position accuracy, while the second finger's movement relative to the first finger determines the zoom level. This local differentiation resolves the contradiction between zoom functionality and selection position stability.
Data Source
AI summary
A second touch zoom solution allows maintaining selection control, and movement of a selection point, during zoom operations not possible through traditional pinch-zoom. A first finger touch to a touch screen establishes a hot spot, selection, or one-finger gesture. Before the first finger is lifted from the touch screen, a second finger is placed on the screen and serves as a zoom control. Dragging the second finger away from the first zooms in; toward the first zooms out. Dragging the first finger does not affect the zoom, even if the motion changes the difference between the two fingers. When the second finger is lifted, the zoom level stays where it is. When the first finger is lifted, the zoom returns to the zoom level before the gesture began.