This function builds a dataframe of information about the path object that can later be used for visualization. The dataframe includes "label" (name of each variety) of each node, "x" (the date of the variety, the x-axis value for which the label and incoming/outgoing edges are centered), "y" (the y-axis value, which is the index of the path, incremented by unity), "xstart" (the x-axis position of the outgoing edge (leaving to connect to the node at the next largest y-value)), "xend" (the x-axis position of the outgoing edge (connected to the node at the next largest y-value)), "ystart" (the y-axis position of the outgoing edge (leaving to connect to the node at the next largest y-value), "yend" (the y-axis position of the outgoing edge (connected to the node at the next largest y-value))).
buildPathDF(path, geneal, colName, colNameY = "")path object representing the path between two vertices
the full genealogy (in data frame format)
the name of the column of the data frame that contains the quantitative variable of interest (in character string format)
the name of the second optional column of the data frame that contains the second optional quantitative variable of interest (in character string format). This optional quantitative variable will be plotted on the vertical axis.