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

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 cr.define('print_preview', function() {
   6   'use strict';
   7
   8   /**
   9    * Immutable two dimensional point in space. The units of the dimensions are
  10    * undefined.
  11    * @param {number} x X-dimension of the point.
  12    * @param {number} y Y-dimension of the point.
  13    * @constructor
  14    */
  15   function Coordinate2d(x, y) {
  16     /**
  17      * X-dimension of the point.
  18      * @type {number}
  19      * @private
  20      */
  21     this.x_ = x;
  22
  23     /**
  24      * Y-dimension of the point.
  25      * @type {number}
  26      * @private
  27      */
  28     this.y_ = y;
  29   };
  30
  31   Coordinate2d.prototype = {
  32     /** @return {number} X-dimension of the point. */
  33     get x() {
  34       return this.x_;
  35     },
  36
  37     /** @return {number} Y-dimension of the point. */
  38     get y() {
  39       return this.y_;
  40     },
  41
  42     /**
  43      * @param {number} x Amount to translate in the X dimension.
  44      * @param {number} y Amount to translate in the Y dimension.
  45      * @return {!print_preview.Coordinate2d} A new two-dimensional point
  46      *     translated along the X and Y dimensions.
  47      */
  48     translate: function(x, y) {
  49       return new Coordinate2d(this.x_ + x, this.y_ + y);
  50     },
  51
  52     /**
  53      * @param {number} factor Amount to scale the X and Y dimensions.
  54      * @return {!print_preview.Coordinate2d} A new two-dimensional point scaled
  55      *     by the given factor.
  56      */
  57     scale: function(factor) {
  58       return new Coordinate2d(this.x_ * factor, this.y_ * factor);
  59     },
  60
  61     /**
  62      * @param {print_preview.Coordinate2d} other The point to compare against.
  63      * @return {boolean} Whether another point is equal to this one.
  64      */
  65     equals: function(other) {
  66       return other != null &&
  67           this.x_ == other.x_ &&
  68           this.y_ == other.y_;
  69     }
  70   };
  71
  72   // Export
  73   return {
  74     Coordinate2d: Coordinate2d
  75   };
  76 });