vellumwidget 0.1.0

vellumwidget 0.1.0

First release. vellumwidget turns a vellum scene or a vellumplot plot into a
self-contained, client-side interactive HTML widget via a single terminal
as_widget() pipe — no Shiny, no server round-trip. Everything below ships in
this first release.

Features

• as_widget() compiles a vellumplot plot or a raw vellum scene and bundles its
  SVG + scene_model() element table into an htmlwidget.
• Hover — tooltip (from the declared tooltip, falling back to the key) and
  highlight with inverse-dim; a hovered element's hover_group highlights the
  whole group. Hover snaps to the nearest mark when the cursor isn't directly
  over one.
• Click — select (single / multiple modes); every element sharing a key
  toggles together.
• Brush — drag a rectangle to select every element it covers.
• Pan / zoom — mouse wheel and pan-mode drag reframe the SVG viewBox, plus
  zoom-to-selection and reset.
• Toolbar (on hover) — brush/pan mode toggle, zoom-to-selection, reset zoom,
  download SVG, download PNG, fullscreen.
• Everything is opt-outable via as_widget() arguments
  (tooltip/hover/select/brush/zoom/toolbar/nearest).
• Legend interaction. For a discrete color/shape scale on an interactive
  plot, each legend swatch drives its whole data series: hovering a swatch
  highlights the series (the swatch stays lit), clicking it selects the series
  (and links across views / crosstalk). Automatic — no extra arguments.
• Linked views. as_widget(group=) links vellumwidget widgets client-side (no
  dependency): selecting/brushing in one highlights the same data keys in the
  others, projecting by hover_group (select one, select the series).
  as_widget(crosstalk = SharedData) bridges to the crosstalk ecosystem
  (plotly / leaflet / DT and filter_* inputs) via a SelectionHandle +
  FilterHandle; a crosstalk filter hides the non-matching marks (display-tier
  cross-filter). crosstalk is a Suggests, loaded only when used.
• Customisable interaction styling, at two composing levels:
  • Widget theme — as_widget(hover_color=, selected_color=, dim_opacity=)
    sets the look for the whole plot (any R or CSS colour).
  • Per-element grammar — vellumplot marks' hover_color/selected_color
    (constant or column-mapped) style each element individually and override the
    theme. Both use CSS variables with a defaults ← theme ← per-element cascade.

The JS runtime is TypeScript in srcts/, bundled by esbuild into the committed
inst/htmlwidgets/vellumwidget.js (so the R package installs with no Node).