The Study And Implementation Of A Touch-based Geometry System

With the rapid development of computer networks and educational informationization, kinds of products which aim at improving the quality of mathematic teaching have gradually approached people’s attention. Geometric sketchpad GeometryEditor, a Web2.0-based application, is a kind of them. With the gradual improvement of the multi touch technology, mobile phones and tablets which base on multi-point touch screen have entered innumberable families, and interactive electronic whiteboards which support multi-point touch screen have gradually entered the classroom of primary and secondary schools. Traditional GeometryEditor cannot meet the needs of touch screen users. This thesis develops the geometry sketchpad TGE (Touch GeometryEditor) for touch devices to satisfy users of mobile phones and tablets, and meet the demands of teachers’ teaching.The current APP (Application Programming Interface) is faced with a problem, namely, cross-platform and compatibility issues. Computer software porting to touch devices also requires a lot of work, and it can’t run at different kinds of platform. And so far, there is no mature touch screen geometry sketchpad software. In this thesis, TGE which design for the mobile terminal touch screen, is based on the geometric sketchpad GeometryEditor, so it can be used on different system equipment. The thesis research has a broad application prospect.Gestures research is the core of TGE transplantation, and gesture interaction is a more natural way of human-computer interaction, so how to use fingers instead of mouse and keyboards is a focus in the study of this thesis. This thesis analyzes basic functions and geometric operations in GeometryEditor, designs different touch gestures to simulate mouse interaction, and completes user’s operations. At the same time, this thesis designs a variety of gestures according with habits of user to optimize system operation, and gives gesture recognitions in this thesis.Aiming at precise target acquisition in the process of transplantation, this thesis analyzes precise target acquisition of the current mainstreams and gives a new precise target acquisition method - virtual mouse scheme which is more suitable for TGE. And this thesis analyzes and calculates offset and edge problem of virtual mouse, gives the general formula and concrete implementation scheme.Aiming at determination of the point in the process of drawing, this thesis gives three kinds of solutions, analyzes the advantages and disadvantages of various methods and their mutual combination, and gives the best solution which is conforming to the concept of Human Computer Interaction.