avocado-old/packages/math/vector/mixin.js

import {compose} from '@avocado/core';
import {Mixin, Property} from '@avocado/mixins'

import * as Vector from './index'

export function VectorMixin(
  vectorKey = 'vector',
  x = 'x',
  y = 'y',
  meta = {},
) {
  meta = {
    default: [0, 0],
    emit: function (...args) {
      if (this.emit) {
        this.emit(...args);
      }
    },
    eq: function(l, r) {
      return Vector.equals(l, r);
    },
    get: function() {
      const vector = this[meta.transformProperty(vectorKey)];
      if (!vector) {
        return [0, 0];
      }
      return [vector[0], vector[1]];
    },
    transformProperty: (key) => `$$avocado_property_${key}`,
    ...meta,
  };
  meta.set = meta.set || function(vector) {
    if (meta.track && meta.emit) {
      if (this[vectorKey][0] !== vector[0]) {
        meta.emit.call(this, `${x}Changed`, this[vectorKey][0], vector[0]);
      }
      if (this[vectorKey][1] !== vector[1]) {
        meta.emit.call(this, `${y}Changed`, this[vectorKey][1], vector[1]);
      }
    }
    this[meta.transformProperty(vectorKey)] = [vector[0], vector[1]];
  }
  const decorate = compose(
    Property(vectorKey, meta),
  );
  return (Superclass) => {
    return class Vector extends decorate(Superclass) {

      get [x]() {
        return this[vectorKey][0];
      }

      set [x](x) {
        this[vectorKey] = [x, this[vectorKey][1]];
      }

      get [y]() {
        return this[vectorKey][1];
      }

      set [y](y) {
        this[vectorKey] = [this[vectorKey][0], y];
      }

    }
  };
}