<!DOCTYPE html>
<!--
Copyright (c) 2014 The Chromium Authors. All rights reserved.
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.
-->

<link rel="import" href="/base/base.html">
<link rel="import" href="/base/extension_registry.html">

<script>
'use strict';

/**
 * @fileoverview Allows custom highlighting to be added to the full model track.
 */
tr.exportTo('tr.c.tracks', function() {

  /**
   * Highlights cetrain features of the model.
   * @constructor
   */
  function Highlighter(viewport) {
    if (viewport === undefined) {
      throw new Error('viewport must be provided');
    }
    this.viewport_ = viewport;
  };

  Highlighter.prototype = {
    __proto__: Object.prototype,

    processModel: function(model) {
      throw new Error('processModel implementation missing');
    },

    drawHighlight: function(ctx, dt, viewLWorld, viewRWorld, viewHeight) {
      throw new Error('drawHighlight implementation missing');
    }
  };


  var options = new tr.b.ExtensionRegistryOptions(tr.b.BASIC_REGISTRY_MODE);
  options.defaultMetadata = {};
  options.mandatoryBaseClass = Highlighter;
  tr.b.decorateExtensionRegistry(Highlighter, options);

  return {
    Highlighter: Highlighter
  };
});
</script>