/*
 * 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,
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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */


/**
 * The Orbit tool allows the user to look around the model by click-dragging.
 * The shift key enters a pan mode instead of orbiting.
 */
function OrbitTool(camera) {
  this.camera = camera;
  this.lastOffset = null;
}

OrbitTool.prototype.handleMouseDown = function(e) {
  var offset = { x: e.x, y: e.y };
  this.lastOffset = offset;
  this.dragging = true;
};

OrbitTool.prototype.handleMouseMove = function(e) {
  if (this.dragging && e.x !== undefined) {
    var offset = { x: e.x, y: e.y };

    dY = (offset.y - this.lastOffset.y);
    dX = (offset.x - this.lastOffset.x);
    this.lastOffset = offset;
    
    
	this.camera.eye.rotZ -= dX / 300;   //rate of rotation
	this.camera.eye.rotH -= dY / 300;
	
	//camera limits
	this.camera.eye.rotH = peg(this.camera.eye.rotH, 0.1, Math.PI - 0.1);
    this.camera.update();
  }
};

OrbitTool.prototype.handleMouseUp = function(e) {
  this.dragging = false;
  //alert("RotZ= " + this.camera.eye.rotZ + "       RotH= " + this.camera.eye.rotH);
};

OrbitTool.prototype.handleKeyDown = function(e) {
  return false;
};

OrbitTool.prototype.handleKeyUp = function(e) {
  return false;
};