Touch Panel Viewpoint Rotation for Nautical Charts
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Solution Overview
Problem
Existing touch panel devices require complex operations to change the viewpoint of map data, especially when displaying three-dimensionally, as the rotational axis is not fixed uniquely, making it difficult for users to intuitively rotate the map data as intended.
Innovation Solution
A touch panel device with a display unit, detector, and controller that detects a first touch operation and a second touch operation to determine a rotational axis parallel or perpendicular to the sea surface, allowing for intuitive viewpoint changes by rotating the map data based on the distance and angle changes between the two touch positions, enabling simultaneous rotations with different reference axes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple touch operations are detected to change viewpoint of map data, then the viewpoint can be changed in multiple directions (height and azimuth), but the operation becomes complicated and not instinctive
Solution Approach 1:
The viewpoint changing function is segmented into two independent rotational operations: one for height direction (parallel to sea surface) and one for azimuth direction (perpendicular to sea surface). Each rotation can be controlled independently through separate touch operations, allowing versatile viewpoint adjustment while maintaining operational clarity through functional separation
Solution Approach 2:
The patent adds a new dimension to touch operations by utilizing two fingers touching at different positions simultaneously. The first finger position determines the rotational axis, while the second finger position and its movement determine the rotation amount. This dimensional expansion of input space enables intuitive control over multiple rotation parameters without increasing operational complexity
2Adaptability or versatility
If the rotational axis is not fixed uniquely for three-dimensional map display, then more flexible viewpoint changes are possible, but it becomes difficult to rotate the map data as the operator intends
Solution Approach 1:
The first finger touch position acts as an intermediary that defines the rotational axis. By fixing this reference point, the system mediates between the unlimited rotational freedom of 3D space and the user's intent to rotate around a specific axis. The second finger's movement relative to this intermediary then precisely controls the rotation amount around the defined axis
Solution Approach 2:
The system uses the user's own touch operations to automatically determine the rotational parameters. The first finger position automatically establishes the rotational axis, and the second finger's movement automatically determines the rotation amount. This self-service mechanism eliminates the need for separate axis selection steps while maintaining precise control over rotation direction and magnitude
Data Source
AI summary
A touch panel device displays a nautical chart as map data on a display screen. The touch panel device detects a first touch operation on the display screen and a second touch operation on the display screen, the first touch operation being a touch operation of which a position is fixed, the second touch operation being a touch operation of which a position is changed. The touch panel device obtains a rotational axis parallel to the sea surface based on the position of the first touch operation, and rotates a viewpoint of the map data centering on the rotational axis based on a change amount of a distance from the position of the first touch operation to the position of the second touch operation.