GRAPH GENERATION DEVICE, GRAPH DISPLAY DEVICE, GRAPH GENERATION PROGRAM, AND GRAPH DISPLAY PROGRAM

摘要

A vector data selection unit (230) selects, from a vector file (292) for a past line graph, vector data (102) for a time period overlapping a new line graph. An attribute value setting unit (240) sets the oldest vector data from among the selected vector data to a high transparency value, sets the newest vector data to a low transparency value, and sets intermediate vector data to an intermediate transparency value. A graph display unit (260) displays the portion of the past line graph for the time period that overlaps with the new line graph using gradation.