Refactor print preview web ui

chrome/browser/resources/print_preview/data/coordinate2d.js

+// Copyright (c) 2012 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.
+
+cr.define('print_preview', function() {
+  'use strict';
+
+  /**
+   * Immutable two dimensional point in space. The units of the dimensions are
+   * undefined.
+   * @param {number} x X-dimension of the point.
+   * @param {number} y Y-dimension of the point.
+   * @constructor
+   */
+  function Coordinate2d(x, y) {
+    /**
+     * X-dimension of the point.
+     * @type {number}
+     * @private
+     */
+    this.x_ = x;
+
+    /**
+     * Y-dimension of the point.
+     * @type {number}
+     * @private
+     */
+    this.y_ = y;
+  };
+
+  Coordinate2d.prototype = {
+    /** @return {number} X-dimension of the point. */
+    get x() {
+      return this.x_;
+    },
+
+    /** @return {number} Y-dimension of the point. */
+    get y() {
+      return this.y_;
+    },
+
+    /**
+     * @param {number} x Amount to translate in the X dimension.
+     * @param {number} y Amount to translate in the Y dimension.
+     * @return {!print_preview.Coordinate2d} A new two-dimensional point
+     *     translated along the X and Y dimensions.
+     */
+    translate: function(x, y) {
+      return new Coordinate2d(this.x_ + x, this.y_ + y);
+    },
+
+    /**
+     * @param {number} factor Amount to scale the X and Y dimensions.
+     * @return {!print_preview.Coordinate2d} A new two-dimensional point scaled
+     *     by the given factor.
+     */
+    scale: function(factor) {
+      return new Coordinate2d(this.x_ * factor, this.y_ * factor);
+    },
+
+    /**
+     * @param {print_preview.Coordinate2d} other The point to compare against.
+     * @return {boolean} Whether another point is equal to this one.
+     */
+    equals: function(other) {
+      return other != null &&
+          this.x_ == other.x_ &&
+          this.y_ == other.y_;
+    }
+  };
+
+  // Export
+  return {
+    Coordinate2d: Coordinate2d
+  };
+});