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+/*
+ * Copyright 2009, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+
+/**
+ * @fileoverview This file contains sample code for controlling the camera
+ * (ie view matrix) using the mouse and keyboard.
+ */
+
+o3djs.provide('o3djs.cameracontroller');
+
+o3djs.require('o3djs.math');
+
+/**
+ * A Module for user control of the camera / view matrix.
+ * @namespace
+ */
+o3djs.cameracontroller = o3djs.cameracontroller || {};
+
+/**
+ * Creates a CameraController.
+ * @param {!o3djs.math.Vector3} centerPos The position that the camera is
+ *     looking at and rotating around; or if backpedal is zero, the location
+ *     of the camera. In world space.
+ * @param {number} backpedal The distance the camera moves back from the
+ *     centerPos.
+ * @param {number} heightAngle The angle the camera rotates up or down
+ *     (about the x axis that passes through the centerPos). In radians.
+ * @param {number} rotationAngle The angle the camera rotates left or right
+ *     (about the y axis that passes through the centerPos). In radians.
+ * @param {function(!o3djs.cameracontroller.CameraController): void}
+ *     opt_onchange Pointer to a callback to call when the camera changes.
+ * @return {!o3djs.cameracontroller.CameraController} The created
+ *     CameraController.
+ */
+o3djs.cameracontroller.createCameraController = function(centerPos,
+                                                         backpedal,
+                                                         heightAngle,
+                                                         rotationAngle,
+                                                         opt_onchange) {
+  return new o3djs.cameracontroller.CameraController(centerPos,
+                                                     backpedal,
+                                                     heightAngle,
+                                                     rotationAngle,
+                                                     opt_onchange);
+};
+
+/**
+ * Class to hold user-controlled camera information and handle user events.
+ * @constructor
+ * @param {!o3djs.math.Vector3} centerPos The position that the camera is
+ *     looking at and rotating around; or if backpedal is zero, the location
+ *     of the camera. In world space.
+ * @param {number} backpedal The distance the camera moves back from the
+ *     centerPos.
+ * @param {number} heightAngle The angle the camera rotates up or down
+ *     (about the x axis that passes through the centerPos). In radians.
+ * @param {number} rotationAngle The angle the camera rotates left or right
+ *     (about the y axis that passes through the centerPos). In radians.
+ * @param {function(!o3djs.cameracontroller.CameraController): void}
+ *     opt_onchange Pointer to a callback to call when the camera changes.
+ */
+o3djs.cameracontroller.CameraController = function(centerPos,
+                                                   backpedal,
+                                                   heightAngle,
+                                                   rotationAngle,
+                                                   opt_onchange) {
+  /**
+   * The position that the camera is looking at and rotating around.
+   * Or if backpedal is zero, the location of the camera. In world space.
+   * @type {!o3djs.math.Vector3}
+   */
+  this.centerPos = centerPos;
+
+  /**
+   * The distance the camera moves back from the centerPos.
+   * @type {number}
+   */
+  this.backpedal = backpedal;
+
+  /**
+   * The angle the camera rotates up or down.
+   * @type {number}
+   */
+  this.heightAngle = heightAngle;
+
+  /**
+   * The angle the camera rotates left or right.
+   * @type {number}
+   */
+  this.rotationAngle = rotationAngle;
+
+
+  /**
+   * Points to a callback to call when the camera changes.
+   * @type {function(!o3djs.cameracontroller.CameraController): void}
+   */
+  this.onchange = opt_onchange || null;
+
+  /**
+   * Whether the mouse is currently being dragged to control the camera.
+   * @private
+   * @type {boolean}
+   */
+  this.dragging_ = false;
+
+  /**
+   * The last X coordinate of the mouse.
+   * @private
+   * @type {number}
+   */
+  this.mouseX_ = 0;
+
+  /**
+   * The last Y coordinate of the mouse.
+   * @private
+   * @type {number}
+   */
+  this.mouseY_ = 0;
+
+  /**
+   * Controls how quickly the mouse moves the camera.
+   * @type {number}
+   */
+  this.dragScaleFactor = 300.0;
+};
+
+/**
+ * Calculates the view matrix for this camera.
+ * @return {!o3djs.math.Matrix4} The view matrix.
+ */
+o3djs.cameracontroller.CameraController.prototype.calculateViewMatrix = function() {
+  var matrix4 = o3djs.math.matrix4;
+  var view = matrix4.translation(o3djs.math.negativeVector(this.centerPos));
+  view = matrix4.mul(view, matrix4.rotationY(this.rotationAngle));
+  view = matrix4.mul(view, matrix4.rotationX(this.heightAngle));
+  view = matrix4.mul(view, matrix4.translation([0, 0, -this.backpedal]));
+  return view;
+};
+
+/**
+ * Method which should be called by end user code upon receiving a
+ * mouse-down event.
+ * @param {!o3d.Event} ev The event.
+ */
+o3djs.cameracontroller.CameraController.prototype.mousedown = function(ev) {
+  this.dragging_ = true;
+  this.mouseX_ = ev.x;
+  this.mouseY_ = ev.y;
+};
+
+/**
+ * Method which should be called by end user code upon receiving a
+ * mouse-up event.
+ * @param {!o3d.Event} ev The event.
+ */
+o3djs.cameracontroller.CameraController.prototype.mouseup = function(ev) {
+  this.dragging_ = false;
+};
+
+/**
+ * Method which should be called by end user code upon receiving a
+ * mouse-move event.
+ * @param {!o3d.Event} ev The event.
+ */
+o3djs.cameracontroller.CameraController.prototype.mousemove = function(ev) {
+  if (this.dragging_) {
+    var curX = ev.x;
+    var curY = ev.y;
+    var deltaX = (curX - this.mouseX_) / this.dragScaleFactor;
+    var deltaY = (curY - this.mouseY_) / this.dragScaleFactor;
+    this.mouseX_ = curX;
+    this.mouseY_ = curY;
+    this.rotationAngle += deltaX;
+    this.heightAngle += deltaY;
+    if (this.onchange != null) {
+      this.onchange(this);
+    }
+  }
+};