| gr2fr | Convert graph into data frame |
| -vdata <nodes> | graph nodes |
| -edata <arcs> | graph arcs |
| -dout <pixeldata> | data frame containing pixels |
This command converts a graph into data frame that contains pixels and colors for plotting the graph using f2i command. A graph structure is defined using two data frames, nodes and arcs. Data frame nodes contains at least three fields having type int or float. First field is considered as horizontal coordinate, second vertical coordinate and third gray level. Other fields may contain some other node related information and are ignored. Data frame arcs contain at least two fields. They must have type int. First field is considered as begin node index (first index is zero) and second field end node index of an arc. Other fields may contain some other arc related information and are ignored.
Example: Assuming that nodes and arcs define a graph, following commands plot the graph.
... # Convert graph into pixels NDA> gr2fr -vdata nodes -edata arcs -dout pix # Convert pixels into image NDA> f2i -d pix -iout img -bgcol 0 -xsize 256 -ysize 256 Doing grayscale Image is 256 x 256. # Show image NDA> mkgrp g NDA> bgimg g -img img NDA> show g