LadderScoring

A Library for scoring IGC files in accordance with BGA Ladder rules, with the addition of Windicapping

The Scoring rules used are defined in the IScoringConfig interface, an instance of which must be passed to the scoreFlight function

Installation

npm install --save ladderscoring

or

yarn add ladderscoring

Include the module in your project:

import { TaskModel, assessFlight, AssessIGCResult, scoreFlight, ScoreIGCResult, IWind, .... } from 'ladderscoring';

Acknowledgements

To user Turbo87 for igc-parser

Interfaces

• IGCFile See igc-parser

• AssessIGCResult

  • The result of running an assessment on an IGCFile

  interface AssessIGCResult {
  
      flightDate: Date | null;
      loggerFlightDate: Date | null;
      flightLoaded: boolean,
  
      taskCompleted: boolean,
      legScoringDistance: number[],      // this is per leg....
      totalScoringDistance: number;
      speed: number,
  
      gpsLandout: boolean,                
      landoutPosition: ITurnPoint | null;
      usedTPs: ITaskTP[],
      missingTPs: ITaskTP[],
      TPTimes: string[],
      StartTime: string | undefined,
      FinishTime: string | undefined,
      LandingTime: string | undefined,
  
      secondPilot: string |null ,
      gliderReg: string,
      gliderType: string | null
      timeTaken: number;
      heightLoss: number;
      assessment: AssessmentResult | null,
      flightException: boolean,
      errorArray: string[],
  }

• IScoringConfig

  interface IScoringConfig  {
  CompetitionID: number;      // The ID of competition for which this config applies. Not used by this module
  DistancePoints: number;     // points/handicapped km. Default 5
  SpeedPoints: number;        // Points/handicapped kph. Default .05
  MinimumSpeed: number;       // minimum handicapped speed to get speed points. Default 50
  CompletionFactor: number;   // multiplier if task completed. Default 1.1
  UseTaskDistance: boolean;    // Use Task or Sector Distance. In calculating performance, whether to use distances between task points or to reducce leg distances by the configured sector sizes
  UseMinDistance: boolean;    // if true, handicapped distance must be greater than glider handicap to get speed points
  CompleteForSpeed: boolean;  // if true, task must be completed to get Speed Points
  }

• ScoreIGCResult

  interface ScoreIGCResult {
  taskDistance: number;   // the basic task distance
  hcDistance: number;     // the distance after windicapping was applied
  scoreDistance: number;  // the scoring distance (=hcDistance if completed)
  completed: boolean;
  taskTime: number;       // time on task in seconds
  hcSpeed: number;        // handicapped speed over the task
  distancePoints: number; // using the Scoring Rules.
  speedPoints: number;
  totalPoints: number;
  errors: string[];
  }

• IWind: used to set the Contest wind for windicapping. Leave undefined for no windicapping

  {
      windstrength: number;   // in knots
      winddirection: number;  // in degrees true
  }

• ITaskPoint

  • Definition of a turnpoint in a Task

  ITaskPoint {
  title: string;                      // eg 'Start', 'Finish'...
  TP: ITurnPoint | null;              // the actual Turnpoint
  sector: Sector;                     // the Sector definition used at this point
  legDistance: number | undefined;    // distance from the previous selected TP, without adj for sector
  sectorDistance: number|undefined;   // adjusted for sector size...    
  }

• ITurnPoint

  • Definition of a Turnpoint. The interface defines all the properties used by a BGA Ladder Turnpoint, but the only ones used by this library are

    ITurnPoint {
    Trigraph: string;
    Name: string;
    Latitude: number;
    Longitude: number;
    }

Classes

• TaskModel - defines the task against which the flight will be assessed. You should create a TaskModel then pass it to the assessFlight and scoreFlight APIs

  • Properties

      CompetitionID?: number;      The ID of the competion in which this task is used (see ladderscoringweb)
      TaskID?:  string | number;   Unique ID for this task
      TaskDate?: string;           Date of this task in ISO (YYYY-MM-DD) form
      turnpoints: ITaskPoint[];    Array of points for this task, in order
      Title: string = '';          A name for this task
      SubTaskOf?: string | number; which larger task this one is derived from, or zero

• Sector - defines a sector as used in the Taskmodel. Create with

  sector = new Sector(
      radius1: number = 0.5,
      angle1: number =180,
      radius2: number=20,
      angle2: number=90,
      line: boolean=false )

  Angles in degrees, distances in km.

API

• loadFlight (flt: string | string[]):IGCParser.IGCFile

  Takes an IGC file as either a single string or as an array of lines and parses it into an IGCFile object.

• assessFlight = async (igcflight: IGCParser.IGCFile, task:TaskModel): Promise<AssessIGCResult>

  Takes an IGCFile object and assesses it against a TaskModel, producing an AssessIGCResult with the results of the analysis.

• scoreFlight = async (task: TaskModel, assessment: AssessIGCResult, wind: IWind, gliderHandicap: number, config: IScoringConfig): Promise<ScoreIGCResult>

  Takes an AssessIGCResult and scores it against the given TaskModel, applying windicapping as appropriate. Set the wind strength to zero for no windicapping.