draw-ellipse-by-bounding-box-mode.ts

import bboxPolygon from '@turf/bbox-polygon';
import distance from '@turf/distance';
import ellipse from '@turf/ellipse';
import { point } from '@turf/helpers';
import { Position, Polygon, FeatureOf } from '../geojson-types';
import { getIntermediatePosition } from './geojson-edit-mode';
import { TwoClickPolygonMode } from './two-click-polygon-mode';

export class DrawEllipseByBoundingBoxMode extends TwoClickPolygonMode {
  getTwoClickPolygon(coord1: Position, coord2: Position, modeConfig: any): FeatureOf<Polygon> {
    const minX = Math.min(coord1[0], coord2[0]);
    const minY = Math.min(coord1[1], coord2[1]);
    const maxX = Math.max(coord1[0], coord2[0]);
    const maxY = Math.max(coord1[1], coord2[1]);

    const polygonPoints = bboxPolygon([minX, minY, maxX, maxY]).geometry.coordinates[0];
    const centerCoordinates = getIntermediatePosition(coord1, coord2);

    const xSemiAxis = Math.max(distance(point(polygonPoints[0]), point(polygonPoints[1])), 0.001);
    const ySemiAxis = Math.max(distance(point(polygonPoints[0]), point(polygonPoints[3])), 0.001);

    // @ts-expect-error fix return types
    return ellipse(centerCoordinates, xSemiAxis, ySemiAxis);
  }
}