| Interaction is an important and necessary part of information visualization (Infovis). Through Interaction techniques, some limits of a representation can be overcome, and it can help users to understand and analyze data better. However, compared to the representation, the research of the interaction is inadequate. Research shows that with regard to the amount of the information displayed and people's perception to the data, the 3D space performs much better than the 2D Space. And currently, extending some 2D interaction methods to 3D will bring out some problems. Therefore, the application of them is not good. This paper discusses that the current status of the interaction technique, and do research and application analyze to the interaction in the 3D scene:Firstly, this paper presents a view-path distortion algorithm. This algorithm solves the basic problem extending the 2D distortion methods to 3D space: the data items far away can be obscured by that near by in the view path, and then the data will not be observed well. This algorithm stretches the data in the view path according the distance from the line of sight. On the basis of maintaining the logic of the data sets, it can help observe the data well.Secondly, we extend a stretching and squishing navigation algorithm in 2D to 3D. Through the progress of the extending, it proposes a new data structure to store the planes'position: the split ratio. Because of this special storage data structure, not only the time complexity of the data updating reduce greatly in one stretch operation, and also propose a local-base transform method which is more flexible to the large scale data sets.Finally, we develop a network data analyze system. According to characteristic of the network data, propose a new 3D network data representation, and on the basis of this representation model, some mainstream interaction techniques and view path distortion algorithm are applied in this system, and analyze the results. |
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