polygon

The column this mark is SLICED by — long-format data, one row per thing per slice, showing the one the scene's parameter over that column holds. A column with a number line interpolates, so a reader stopped between two values sees half way; a column of names selects the rows carrying the name they picked.

Fill polygon.

Colour.

Opacity.

Draws the outline dashed. What it is for is the shape that is not there: where a figure was before it moved, a region a constraint rules out, a construction that explains the drawing without being part of it.

How the outline gets from one vertex to the next: linear for straight sides, bezier for a closed round outline, on the same midpoint handles as the line’s. No step — a staircase is a reading against x, and a closed outline is not one.

Text drawn beside the element — rich text, so $maths$ and inline formatting render. Fades and draws with the element.

Declared but not drawn. Animatable — hidden: true !cue.to{false}(at: 2) reveals it — and unlike a cue, a hidden element still frames the plot, so the axes do not jump when it appears.

Keeps the reader from editing this element on an editable: graph. Nothing at all on a graph that is not editable.

Text size.

Paint order among the marks: a higher layer is drawn later, on top; equal or omitted, the marks stack in document order (later on top). Written z: before the argand plane took that letter for its coordinate.

The vertices' x coordinates, e.g. 0, 2, 1. Numbers or a dataset column; entries may be expressions of parameters.

The vertices' y coordinates, paired with x by position.

On the argand plane, the readings as complex numbers: written out (1 + i, 2 - i, -3i, a bare number a real), or a column of complex literals bound whole (#roots.z). Instead of re/im.

On the argand plane, the readings' real parts, one per reading — numbers written out or a column — paired with im by position.

On the argand plane, the readings' imaginary parts, paired with re by position.

On the polar plane, the readings' distances from the origin, paired with theta by position.

On the polar plane, the readings' angles in radians (60deg for degrees), paired with r by position; names on a categorical theta.