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],
    eq: function(l, r) {
      return Vector.equals(l, r);
    },
    ...meta,
  };
  let transformedProperty;
  if (meta.transformProperty) {
    transformedProperty = meta.transformProperty(vectorKey);
  }
  else {
    transformedProperty = `$$avocado_property_${vectorKey}`;
  }
  meta.initialize = function() {
    this[transformedProperty] = Vector.copy(meta.default);
  };
  let bypassUpdates = false;
  meta.set = meta.set || function(vector) {
    this[transformedProperty] = Vector.copy(this[transformedProperty]);
    if (bypassUpdates) {
      this[transformedProperty][0] = vector[0];
      this[transformedProperty][1] = vector[1];
    }
    else {
      this[x] = vector[0];
      this[y] = vector[1];
    }
  };
  const decorate = compose(
    Property(x, {
      get: function() {
        return this[transformedProperty][0];
      },
      set: function(value) {
        bypassUpdates = true;
        this[vectorKey] = [value, this[y]];
        bypassUpdates = false;
      },
      track: meta.track,
    }),
    Property(y, {
      get: function() {
        return this[transformedProperty][1];
      },
      set: function(value) {
        bypassUpdates = true;
        this[vectorKey] = [this[x], value];
        bypassUpdates = false;
      },
      track: meta.track,
    }),
    Property(vectorKey, meta),
  );
  return (Superclass) => {
    return class Vector extends decorate(Superclass) {}
  };
}