silphius/app/ecs-components/position.js

import Schema from '@/ecs/schema.js';

export default function(Component) {
  return class Wielder extends Component {
    instanceFromSchema() {
      const Instance = super.instanceFromSchema();
      const Component = this;
      Object.defineProperty(Instance.prototype, 'tile', {
        get: function () {
          const {TileLayers} = Component.ecs.get(1);
          const {Position: {x, y}} = Component.ecs.get(this.entity);
          const {tileSize} = TileLayers.layers[0];
          return {
            x: (x - (x % tileSize.x)) / tileSize.x,
            y: (y - (y % tileSize.y)) / tileSize.y,
          }
        },
      });
      return Instance;
    }
    static schema = new Schema({
      type: 'object',
      properties: {
        x: {type: 'float32'},
        y: {type: 'float32'},
      },
    });
  }
}