ionChangeAmount(view) {
    console.log("ionChangeAmount: " + view.form.controls.amount.value);

    let formatNumberWithPoints = (x) => {
      x = x.toString();
      var pattern = /(-?\d+)(\d{3})/;
      while (pattern.test(x)) x = x.replace(pattern, "$1.$2");
      return x;
    };
    let cleanAmount = view.form.controls.amount.value || "0";
    cleanAmount = parseInt(cleanAmount.replace(/\D+/g, "") || "0");
    if (
      !cleanAmount ||
      (view.item.amountMin && cleanAmount / 100 < view.item.amountMin) ||
      (view.item.amountMax && cleanAmount / 1000 > view.item.amountMax)
    ) {
      setTimeout(() => view.form.controls.amount.setErrors({ incorrect: true }));
    } else {
      setTimeout(() => view.form.controls.amount.setErrors(false));
    }
    let entire = Math.floor(cleanAmount / 100);
    let decimal = cleanAmount / 100 - entire;
    cleanAmount = formatNumberWithPoints(entire) + "," + decimal.toFixed(2).split(".")[1];
    if (cleanAmount && cleanAmount != "0") {
      view.form.controls.amount.setValue("$ " + cleanAmount);
    } else {
      view.form.controls.amount.setValue(null);
    }
  }

/* Math (c) Kraft, MIT License */
/**
 * Math (c) Kraft
 */
/**
 * type checking
 */
/**
 * one way to improve these input finders is to search in all indices
 * of the arguments list, right now it assumes THIS is the only thing
 * you're passing in. in the case that it isn't and there's an object
 * in the first slot, it won't find the valid data in the second.
 */
/**
 * @description get the type of an object, which includes the custom types in this library.
 * @param {any} any object
 * @returns {string} the type name
 * @linkcode Math ./src/types/typeof.js 17
 */
const typeOf = function (obj) {
    switch (obj.constructor.name) {
    case "vector":
    case "matrix":
    case "segment":
    case "ray":
    case "line":
    case "circle":
    case "ellipse":
    case "rect":
    case "polygon": return obj.constructor.name;
    }
    if (typeof obj === "object") {
        if (obj.radius != null) { return "circle"; }
        if (obj.width != null) { return "rect"; }
        if (obj.x != null || typeof obj[0] === "number") { return "vector"; }
        // line ray segment
        if (obj[0] != null && obj[0].length && (typeof obj[0].x === "number" || typeof obj[0][0] === "number")) { return "segment"; }
        if (obj.vector != null && obj.origin != null) { return "line"; } // or ray
    }
    return undefined;
};