Graphics Reference
In-Depth Information
immediately adjacent. For example, the flow from China to the United
States (bright pink) is much larger than the flow from the United States to
China (purple), whereas the flow to/from Canada and the United States is
almost equal.
Figure 5-22: In this graph of trade flows of the top 12 countries (by 2012
GDP), curved arrows indicate direction of flow, and edge color and width
indicate value of trade flow. Subtle curvature keeps the opposite flow close
for comparison.
Curved edges are sometimes used in undirected graphs—they can be used
to reduce apparent connections between a series of nodes all in a row; and
sometimes curved edges are used because they are aesthetically pleasing.
Figure 5-23 shows curved edges on the e-mail data set.
 
 
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