MarkerAnnotation class

A small visual indicator for workflow elements (BPMN-style markers).

Markers are compact annotations that attach semantic meaning to nodes or positions in the workflow. They're rendered as circular badges with icons and optional tooltips.

Common use cases include:

• Indicating task types (user, script, service)
• Showing status (error, warning, info)
• Marking special workflow points (decision, milestone)
• Highlighting compliance or risk areas

Example

final errorMarker = MarkerAnnotation(
  id: 'marker-1',
  position: Offset(150, 200),
  markerType: MarkerType.error,
  color: Colors.red,
  tooltip: 'Validation failed',
);
controller.annotations.addAnnotation(errorMarker);