Multi-Point Touch Image Rotation via Virtual Line Slope
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Solution Overview
Problem
Existing touch user interfaces are not designed to effectively recognize and interact with multi-point touch inputs, limiting the ability to manipulate displayed information on user equipment.
Innovation Solution
A method and apparatus that allow an image on a touch screen to be rotated based on multi-point touch inputs, where the rotation is determined by the change in slope or position of virtual lines connecting the touch inputs, enabling rotation with a fixed or varying angle and direction, and allowing selection and manipulation of image portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If related art touch user interfaces are used, then the interface is simple to implement, but the interface cannot effectively recognize and interact with multi-point touch inputs
Solution Approach 1:
The touch interface dynamically adapts its behavior based on the number of touch points detected. The system transitions from single-point to multi-point touch recognition, enabling real-time functional changes without requiring separate interface designs for different touch scenarios.
Solution Approach 2:
The touch screen interface is designed to handle multiple functions through a unified multi-point touch recognition system. A single interface structure supports various operations including rotation, zooming, and panning by detecting different multi-point touch patterns, eliminating the need for multiple specialized interfaces.
2Ease of operation
If multi-point touch input recognition is implemented, then the user interface capability is enhanced, but the interface design and interaction complexity increases
Solution Approach 1:
The system automatically calculates rotation angles and transformation parameters based on the geometric relationship between touch points. The controller autonomously determines the rotational operation without requiring explicit user specification of rotation parameters, reducing the perceived complexity for users.
Solution Approach 2:
The interface provides real-time visual feedback as users perform multi-point touch gestures. The displayed image responds dynamically to touch input movements, allowing users to see the rotation effect in progress and adjust their gesture accordingly, making the complex interaction more intuitive and controllable.
3Ease of operation
If rotation angle is proportional to rotational distance, then the rotation is smooth and controllable, but the calculation and processing complexity increases
Solution Approach 1:
The system changes the parameter relationship between touch movement and rotation output. By making the rotation angle proportional to the rotational distance traveled by touch points, the system creates a linear mapping that simplifies user control while maintaining smooth rotation behavior.
Data Source
AI summary
Apparatus and method for rotating a displayed image by using multi-point touch inputs. In order to rotate an image displayed on a display of a user equipment having a touch input device. A first touch input may be made at a first position of the touch input device. Then, a second touch input may be made at a second position of the touch input device while the first touch input remains at the first position of the touch input device. The second touch input may be advanced from the second position to a third position while the first touch input remains fixed at the first position. After advancing, the displayed image may be rotated based on a change in slope of a virtual line connecting the first touch input and the second touch input as the second touch input advances from the second position to the third position.