Title: A Geometric Transformation Method for Preventing Focuses from Overlapping in a Focus+Glue+Context Map

Year of Publication: March - 2014
Page Numbers: 5-13
Authors: Hiroya Mizutani, Daisuke Yamamoto, and Naohisa Takahashi
Conference Name: The Second International Conference on E-Technologies and Business on the Web (EBW2014)
- Malaysia


We previously proposed a Focus+Glue+Context-type Fisheye View Map system called Emma. Emma is a map system comprising areas that expand to display areas of focus (Focus), peripheral areas (Context), and areas that absorb the difference between the scales of both areas and display the roads that connect the two areas (Glue). When users explore multiple destinations using Emma, they can simultaneously view wide-area maps and detailed maps of each destination by positioning a Focus on each destination. On such a map, when users move the Focus along the route in order to confirm the route from one to another, for instance, the Focuses sometimes overlap each other. This creates a problem in that the roads between the Focus and Context areas cannot be correctly drawn. In order to solve this problem, we propose a Geometric Transformation method as a solution. This method can prevent Focuses from overlapping by transforming and uniting Focuses while considering the size and position of each Focus area. We have proved the efficiency of the Geometric Transformation method by comparing it with the Water Drop method, which we previously proposed.