LabelCalculator class

Utility class for calculating connection label positions.

This calculator determines the exact rectangular bounds for connection labels positioned anywhere along the connection path using anchor values (0.0-1.0) and perpendicular offsets.

Key Features

• Arbitrary positioning: Labels can be placed at any point (0.0-1.0) along the path
• Perpendicular offset: Labels can be offset perpendicular to the path direction
• Path-accurate: Uses actual connection path geometry for precise positioning
• Multiple labels: Supports any number of labels per connection

Usage Example

final labelRects = EdgeLabelPositionCalculator.calculateAllLabelPositions(
  connection: myConnection,
  sourceNode: sourceNode,
  targetNode: targetNode,
  connectionStyle: ConnectionStyles.smoothstep,
  curvature: 0.5,
  portSize: 8.0,
  endpointSize: Size.square(5.0),
  labelTheme: myLabelTheme,
);

// Render each label at its calculated position
for (final rect in labelRects) {
  // Draw label at rect
}

See also:

• ConnectionLabel for label configuration
• LabelTheme for label styling
• Connection for label management