edges

The column naming each row's first vertex: #data.column. Given with to:, or not at all.

The column naming each row's second vertex.

A numeric column of edge weights: a path's length, a vertex table's size: weight, width: weight and show-weights all read it. A cell that is not a number leaves that row unweighted, and a negative cell is read as positive.

The stroke width, in pixels: one width, a list one per row, or an expression from each edge's reading — #self.weight, the flow map's convention, or a numeric column: width: #self.weight -> 1..50 -> 1 + 7_ draws weight 1 at 1 pixel and 50 at 8, in step between; a map with a width per interval bands them. A column changes no measurement.

weight makes each edge of a tree or binary-tree as long as its weight, so a vertex stands as far from the root as the weights on the way to it add up to — a phylogram, or a UPGMA dendrogram, whose leaves then line up by themselves. An unweighted edge, and every edge of a list left none, is one long. Other layouts ignore it.

elbow draws each edge square — across at its parent's rank, then along the direction: to its child — so only the run along the flow carries length: the phylogram's and the dendrogram's convention. Read by the ranked layouts: tree, binary-tree, layered and bipartite. straight is one line.

The column this list is sliced by — long-format, one row per edge per slice — showing the edges of the slice the scene's control over that column stands on: edges(from: #ties.a; to: #ties.b; slice: #ties.month) with cue.slider:m(column: #ties.month). On a slider, the slice shown is the last at or before its value. Rows naming one pair the same way round are one edge, with the weight, colour and width of its first row. Every measurement counts every slice; the layout settles to each slice's edges, the vertices gliding, and edges fade in and out.

The rows' colour: one colour for every row, a list one per row, or a map applied to a column, colour: #trade.kind -> (import: red; otherwise: grey), the names it keys named in the footer's key. #self.weight or a numeric column grades the rows: a map bands them, colour: #self.weight -> (..<10: grey; 10..: red), and an interval then a ramp's name ramps them. colour-from: colours each edge from its vertices instead. Unset, a neutral grey.

A rule that colours each edge from the vertices it joins, in place of colour:: ends, theirs where they share one and an even mix where they differ; gradient, from the colour of the vertex it leaves to the colour of the one it reaches; from, the colour of the vertex it leaves; to, the colour of the one it reaches — a flow's bands coloured by where they end up; none, the edge's own colour:.

Dashed strokes.

Declared but not drawn, with the vertices only this list names. They still count in every measurement. Animatable.

Each edge's weight, from weights: or an inline edge's weight:, read as #self.weight: width: #self.weight -> 1..50 -> 1 + 7_ draws weights 1 and 50 at 1 and 8 px.