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Method for identifying graph dynamic relationship

A relationship identification and graphics technology, applied in graphics reading, instruments, electrical digital data processing, etc., can solve the problem of lack of technical means to realize mutual relationship identification, and achieve the effect of convenient wireless electronic whiteboard, convenient and fast operation, and easy support.

Active Publication Date: 2013-01-30
HUAZHONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is still a lack of technical means to recognize the mutual relationship between graphics

Method used

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  • Method for identifying graph dynamic relationship
  • Method for identifying graph dynamic relationship
  • Method for identifying graph dynamic relationship

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0025] A graphical relationship analysis

[0026] Since a polygon is a collection of multiple line segments, the recognition of the relationship between graphics only needs to consider three basic graphics: points, lines and circles. The basic elements of relation recognition are firstly analyzed for different graphs.

[0027] (1 o'clock

[0028] Graphic recognition software usually sets the point by clicking the mouse and inputting it into the computer. Generally, the user clicks the left button of the mouse, and the built-in graphic recognition function of the graphics input software will judge it as a point. Points can be divided into five categories: free point, line point, circle point, graphics intersection point, and overlapping point. In applications that support dynamic geometry, point attributes (not including coordinate positions) will remain unchanged.

[0029] Free point: the point generated when the left mouse button is pressed on any blank area on the client a...

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Abstract

The invention discloses a method for identifying a graph dynamic relationship, which is used for performing relationship identification on graphs drawn by a mouse and input into a computer. The types of the graphs comprise point, line or circle; when the current graph input into the computer through a single click of the mouse is a point, whether former graphs exist under the current graph or not is judged; if the former graphs do not exist under the current graph, the current graph is judged to be a free point; if the former graphs exist under the current graph, the number of all the former graphs under the current graph is extracted, and the former graphs are processed respectively according to the number to identify overlapped points, points on a line, and points on a circle; when the current graph input into the computer through movements of the mouse is a line, whether the former graphs exist under the current graph or not is judged; if the former graphs do not exist under the current graph, the current graph is judged to be a free line; and if the former graphs exist under the current graph, and a judgment is performed according to the position of the terminating point of the movement of the mouse during drawing the current graph, wherein if the type of the former graphs is line, whether the current graph is a center line or a perpendicular line of the former graphs is judged, and if the type of the former graphs is circle, whether the current graph is a tangent line of the former graphs is judged.

Description

technical field [0001] The invention belongs to the technical field of teaching automation, and in particular relates to a method for identifying dynamic relationships of graphics. Background technique [0002] The current interactive electronic whiteboard has been gradually applied in the modern classroom teaching environment. It is different from the blackboard in the traditional classroom. It has the characteristics of strong interaction, support for freehand drawing, and easy editing. The interactive electronic whiteboard can communicate with the computer, connect the electronic whiteboard to the computer, and use the projector to project the content on the computer to the electronic whiteboard screen. With the support of special applications, a large screen, interactive style collaborative meeting or teaching environment. Using a specific electronic whiteboard pen instead of a mouse to operate on the whiteboard, you can run any application, edit, annotate, save files, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K11/06G06F3/0487
Inventor 朱晓亮刘清堂张国庆宋晓娟
Owner HUAZHONG NORMAL UNIV
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