#moonrockz/diagrams-animated

AnimatedRenderer returns one standalone text/html artifact for BPMN, sequence or swimlane diagrams. It includes a script-free display SVG, a source-bound pure plan and an offline player. It starts paused. Its overlay follows the actual rendered paths; removing the overlay leaves the complete static diagram.

The default illustrates authored sequence messages or BPMN sequence/message flows in source order and repeats. Alternative branches are separate illustrations, not one asserted execution. Explicit finite scenarios preserve the caller's order, repetitions and concurrent branches. Conditions, timer text and event descriptions are data. No process execution, token simulation or expression evaluation occurs.

#Generate an artifact

///|
test "render an offline sequence illustration" {
  let sequence = @sequence.Sequence::new(
    [@sequence.Participant::new("Client"), @sequence.Participant::new("API")],
    [
      Message(@sequence.Message::new("Client", "API", "request")),
      Message(@sequence.Message::new("API", "API", "work")),
      Message(@sequence.Message::new("API", "Client", "reply")),
    ],
  )
  let result = @animated.AnimatedRenderer::new().render(Sequence(sequence))
  assert_eq(result.media_type, "text/html")
  assert_true(result.output.unwrap().contains("data-control=\"seek\""))
  assert_true(result.output.unwrap().contains("Download SVG"))
}

Save the string as an HTML file and open it in a browser. There are no external scripts, fonts, requests or storage requirements. Source text is escaped SVG and script-context JSON data, including script terminators and Unicode separators. It never becomes active markup or code.

Use svg= to choose the shared theme, adaptive/fixed mode, BPMN geometry policy, geometry limits and an ID prefix. Different prefixes isolate adjacent copies. playback= accepts the full immutable PlaybackPlan; source mismatch produces animation/plan-mismatch with no HTML. The earlier plan= first-flow BPMN API remains supported. Supply one plan input. The default sequence view ID is sequence; an explicit playback plan supplies its own view ID unless overridden with sequence_view_id=.

///|
test "render a finite concurrent BPMN scenario" {
  let view = @model.Bpmn::new(
    "P",
    [
      @model.Node::new("A", Task, label="Review"),
      @model.Node::new("B", Task, label="Record"),
    ],
    [@model.Flow::new("AB", "A", "B"), @model.Flow::new("BA", "B", "A")],
  )
  let catalog = @animation.Catalog::bpmn(view).catalog.unwrap()
  let a = catalog.flow("AB").unwrap().key
  let b = catalog.flow("BA").unwrap().key
  let playback = @animation.PlaybackPlan::scenario(
    catalog,
    @animation.Motion::serial([
      @animation.Motion::parallel([Step(a, 1000L), Step(b, 500L)]),
      Step(a, 1000L),
    ]),
  ).plan.unwrap()
  let result = @animated.AnimatedRenderer::new(playback~).render(Bpmn(view))
  assert_true(result.output != None)
  assert_true(result.output.unwrap().contains("Explicit scenario"))
}

#Controls and exploration

Play/Pause, Restart, Step, Speed and Position are keyboard-operable. Step advances to the next scheduled step start, or completion. Seeking while paused stays paused; speed changes preserve logical position. Reduced motion prevents continuous playback and permits explicit steps/seeks. A hidden page suspends frames without advancing through hidden time. Printing shows the static diagram without controls, selection effects or overlays.

Choose endpoints to show one deterministic shortest structural route or upstream, downstream or bidirectional reachability. Message flows are opt-in. Associations are excluded from control routes. The runtime uses the catalog's actual semantic endpoints and never substitutes a pool or collapsed scope for a hidden activity. Sequence queries use message occurrences and frame controls, not participant cycles. Limit exhaustion and unreachable results are distinct. Selecting a route replaces the active plan/overlay without changing the source, layout or canonical SVG. Reset view restores the original supplied plan.

Download SVG saves the stored canonical bytes from the ordinary SVG renderer. It excludes display instrumentation, controls, highlights and motion, and keeps the current playback position and selection. Canonical and display copies use the same measured geometry. Both SVG APIs remain script-free.

#Bounds, browsers and verification

limits= controls catalog/plan bounds; query_limits= controls browser searches independently. output_units= is a conservative escaped UTF-16 allocation budget, defaulting to 32 Mi units for the HTML and embedded data. Invalid plans, missing bindings and exhausted bounds return diagnostics without partial HTML. Geometry has its own limits on the supplied SvgRenderer. All inputs remain immutable.

A browser needs SVG path geometry methods, animation frames, media queries, JavaScript Map and Blob/object-URL downloads. CI qualifies the locked Playwright Chromium. Planning, sampling, scene creation and HTML construction remain pure; only the generated browser runtime reads a clock or DOM.

mise run test:animation qualifies current-commit stored artifacts without a workspace or site rebuild. It uses the existing locked Playwright/Chromium. The Site CI job runs the same harness and is required by ci-ok. Tests compare browser state against MoonBit samples/routes and cover path/viewport equality, self-messages, concurrent/repeated occurrences, hostile labels, all controls, visibility, reduced motion, print, independent viewers and exact downloads. Portable tests compare complete scene/HTML bytes on all four targets.

Trusted runtime sources live in assets/player.js and assets/player.css. After an intentional change run mise run animation-assets:generate; normal validation rejects stale embedding. No module publication or release is performed by these tasks.

#Swimlane playback

Swimlane scenes use the same offline controls. Directed and bidirectional routes retain traversal orientation. The direction selector also applies to swimlane routes; the unheaded-connection option explicitly includes undirected edges. Markers and canonical SVG never change as a route travels backward. Lane membership never implies a connection and collapsed descendants stay outside query scope. Parallel connection IDs remain independently bound to their paths. The Connection selector and Show connection button select one exact occurrence independently of endpoint-route tie-breaking.

///|
test "render a finite reverse swimlane scenario" {
  let view = @swimlane.Swimlane::new(
    "Review",
    [@swimlane.Node::new("A"), @swimlane.Node::new("B")],
    [@swimlane.Connection::new("AB", "A", "B", source_marker=Arrow)],
  )
  let catalog = @animation.Catalog::swimlane(view).catalog.unwrap()
  guard catalog.graph.route("B", "A") is Found(route) else {
    fail("missing return")
  }
  let playback = @animation.PlaybackPlan::route(catalog, route).plan.unwrap()
  let output = @animated.AnimatedRenderer::new(playback~).render(Swimlane(view))
  assert_true(output.output is Some(_))
  assert_eq(output.media_type, "text/html")
}

AnimatedRenderer

source

pub struct AnimatedRenderer {
  plan : @moonrockz/diagrams/animation.MotionPlan
MotionPlan?
  playback : @moonrockz/diagrams/animation.PlaybackPlan
PlaybackPlan?
  svg : @moonrockz/diagrams-svg.SvgRenderer
SvgRenderer
  limits : @moonrockz/diagrams/animation.Limits
Limits
  query_limits : @moonrockz/diagrams/animation.Limits
Limits
  sequence_view_id : String?
  output_units : Int
}

Offline playback over a pure scene and a validated source-bound plan. The earlier first-flow plan remains a compatible optional input.

impl Renderer for AnimatedRenderer

AnimatedRenderer::new

source

fn AnimatedRenderer::new(plan? : @moonrockz/diagrams/animation.MotionPlan
MotionPlan, playback? : @moonrockz/diagrams/animation.PlaybackPlan
PlaybackPlan, svg? : @moonrockz/diagrams-svg.SvgRenderer
SvgRenderer, limits? : @moonrockz/diagrams/animation.Limits
Limits, query_limits? : @moonrockz/diagrams/animation.Limits
Limits, sequence_view_id? : String, output_units? : Int) -> AnimatedRenderer

AnimatedRenderer::render

source

fn AnimatedRenderer::render(self : AnimatedRenderer, diagram : @moonrockz/diagrams/render.Diagram
Diagram) -> @moonrockz/diagrams/render.Rendered
Rendered