opt-cc/static/src/app/utils/chart-utils.ts

export class ChartUtils {

  public static getShortDateString(date): string {
    const isoDate = date.slice(0, 10);
    const dayDate = parseInt(isoDate.slice(8, 10));
    return (dayDate < 10 ? "0" + dayDate : dayDate) + '.'
      + isoDate.slice(5, 7) + '.' + isoDate.slice(2, 4);
  }

  public static getSeriesEntry(name, value) {
    return {
      "name": name,
      "value": value
    };
  }

  public static getMultiDataArray(...args: string[]) : any[] {
    const obj = [];
    for (let i = 0, arg; arg = args[i]; i++) {
      obj.push({
        "name": arg,
        "series": []
      })
    }
    return obj;
  }

  public static getSingleDataArray(name1, value1, name2, value2): any[] {
    return [{
      "name": name1,
      "value": value1
    }, {
      "name": name2,
      "value": value2
    }];
  }
}