topical media & game development
[] readme course(s) preface I 1 2 II 3 4 III 5 6 7 IV 8 9 10 V 11 12 afterthought(s) appendix reference(s) example(s) resource(s) _

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graphic-o3d-samples-home-configurators-pantool.js / js



  /*
   * 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.
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   * 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
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   * 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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   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
The Pan tool allows the user to pan around the view by clicking and dragging. 

  
  function PanTool(camera) {
    this.camera = camera;
    this.dragging = false;
    this.lastOffset = null;
  }
  
  PanTool.prototype.handleMouseDown = function(e) {
    var offset = { x: e.x, y: e.y };
    this.lastOffset = offset;
    this.dragging = true;
  };
  
  PanTool.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.target.x -= (dY * Math.cos(this.camera.eye.rotZ) +
          dX * Math.sin(this.camera.eye.rotZ)) /
          (700 / this.camera.eye.distanceFromTarget);
      this.camera.target.y += (-dY * Math.sin(this.camera.eye.rotZ) +
          dX * Math.cos(this.camera.eye.rotZ)) /
          (700 / this.camera.eye.distanceFromTarget);
  
      this.camera.update();
    }
  };
  
  PanTool.prototype.handleMouseUp = function(e) {
    this.dragging = false;
  };
  
  PanTool.prototype.handleKeyDown = function(e) {
    return false;
  };
  
  PanTool.prototype.handleKeyUp = function(e) {
    return false;
  };
[] readme course(s) preface I 1 2 II 3 4 III 5 6 7 IV 8 9 10 V 11 12 afterthought(s) appendix reference(s) example(s) resource(s) _

(C) Æliens 20/2/2008

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