Marker

markerNode

A point on the earth. Singly, at: takes a coordinate (latitude first) — parametised and animatable, so a marker rides a slider or a keyframe — with an optional label:. Data-bound, lat: and lon: name @data columns and one marker draws every row; size-by: names a numeric column and symbol AREA scales with the value, size: giving the largest symbol's radius — the proportional-symbol map.

#Attributes

atImplicit

geo-coordinate

The place, latitude first: at: 35.68, 139.69. Either half may be a parametised expression; animatable with !cue.to.Can be written as shorthand: marker:value

lat

reference

Data-bound form: the latitude column, e.g. lat: #quakes.lat.

lon

reference

Also written: lngData-bound form: the longitude column.

size-by

reference

A numeric column; symbol area scales with it. Rows with no positive value draw nothing.

size

parametised-number

The symbol radius — the largest symbol's, when size-by: scales the rest.

Default6

colour

Also written: colorThe marker's hue.

neutralredorangeyellowgreentealbluepurplepinkgreywhiteblack

Defaultorange

opacity

number

0 to 1.

Default1

label

string

Rich inline label above the marker (single form only).

hidden

boolean

Declared but not drawn. Animatable.

Defaultfalse

#Allowed in

canvas.geo { }

#Examples

marker(at: 51.47, -0.46; label: London)

marker(lat: #quakes.lat; lon: #quakes.lon; size-by: #quakes.magnitude; colour: red; opacity: 0.6)