Projection of a directed graph (pseudo-TS-code)

projection-essence.ts

export enum Style {
  none, selected, highlighted
}

export abstract class Element {
  abstract style(): Style;
}

export class ProjectedVertex extends Element {
  id: number;
  position: Point;
  style() { /* ... */ }
}

export class Edge extends Element {
  fromVertex: ProjectedVertex;
  toVertex: ProjectedVertex;
  style() { /* ... */ }
}


export type Projection = Element[];

export function projectStore(store: Store): Projection {
  // ...
}