The Study And Implementation Of Mobile Computing Based PDA GeometryEditor

With the rapid development of computer networks and the development of educational informationization, kinds of products which aim at improving the quality of mathematic teaching has gradually approached people’s attention, Geometric Sketchpad is a kind of them. Geometric Sketchpad provides users with geometric objects and geometric manipulation editing environment. At present, almost all of the Geometric Sketchpad existing in the form of software, and running on a stand-alone environment, therefore can not provide users with the functionality of the mutual exchange and sharing of resources.Compared to the above Geometric Sketchpad systems, the GeometryEditor this paper introduced has significant advantages:GeometryEditor’s drawing panel is embedded in a website, users can visit the site through a browser client, and edit points, segments, circles and other geometry objects via mouse drag operation. Users also can use the various tools provided by the system to achieve functions such as computing the radius and area of a circle, judge the relationship between two lines, etc.This paper combined the iPad touch platform response events, touches gestures and gesture operation characteristic, designed and developed the PDA GeometryEditor (PGE, for short) system which is the product of transplanted the functions and manipulates of GeometryEditor to the iPad and other touch platform devices. The paper described in detail the transplantion program of the PGE system, in-depth studied the touch gestures and specific interaction task mapping problem, designed a touch gestures and geometric operations mapping program with could better suits PGE users’habits. Besides, this paper extracted PDA GeometryEditor’s three-layer structure, by analyzing the three-layer structure we proposed a two-layer mapping program among the three layers, thus improved the portability and cross-platform ability of PDA GeometryEditor system.