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mobile-query-three-vendor-three.js-controls-TrackballControls.js / js



  

author: Eberhard Graether / egraether.com/

  
  
  THREE.TrackballControls = function ( object, domElement ) {
  
          THREE.EventDispatcher.call( this );
  
          var _this = this;
          var STATE = { NONE: -1, ROTATE: 0, ZOOM: 1, PAN: 2, TOUCH_ROTATE: 3, TOUCH_ZOOM: 4, TOUCH_PAN: 5 };
  
          this.object = object;
          this.domElement = ( domElement !== undefined ) ? domElement : document;
  
          // API
  
          this.enabled = true;
  
          this.screen = { width: 0, height: 0, offsetLeft: 0, offsetTop: 0 };
          this.radius = ( this.screen.width + this.screen.height ) / 4;
  
          this.rotateSpeed = 1.0;
          this.zoomSpeed = 1.2;
          this.panSpeed = 0.3;
  
          this.noRotate = false;
          this.noZoom = false;
          this.noPan = false;
  
          this.staticMoving = false;
          this.dynamicDampingFactor = 0.2;
  
          this.minDistance = 0;
          this.maxDistance = Infinity;
  
          this.keys = [ 65 /*A*/, 83 /*S*/, 68 /*D*/ ];
  
          // internals
  
          this.target = new THREE.Vector3();
  
          var lastPosition = new THREE.Vector3();
  
          var _state = STATE.NONE,
          _prevState = STATE.NONE,
  
          _eye = new THREE.Vector3(),
  
          _rotateStart = new THREE.Vector3(),
          _rotateEnd = new THREE.Vector3(),
  
          _zoomStart = new THREE.Vector2(),
          _zoomEnd = new THREE.Vector2(),
  
          _touchZoomDistanceStart = 0,
          _touchZoomDistanceEnd = 0,
  
          _panStart = new THREE.Vector2(),
          _panEnd = new THREE.Vector2();
  
          // for reset
  
          this.target0 = this.target.clone();
          this.position0 = this.object.position.clone();
          this.up0 = this.object.up.clone();
  
          // events
  
          var changeEvent = { type: 'change' };
  
          // methods
  
          this.handleResize = function () {
  
                  this.screen.width = window.innerWidth;
                  this.screen.height = window.innerHeight;
  
                  this.screen.offsetLeft = 0;
                  this.screen.offsetTop = 0;
  
                  this.radius = ( this.screen.width + this.screen.height ) / 4;
  
          };
  
          this.handleEvent = function ( event ) {
  
                  if ( typeof this[ event.type ] == 'function' ) {
  
                          this[ event.type ]( event );
  
                  }
  
          };
  
          this.getMouseOnScreen = function ( clientX, clientY ) {
  
                  return new THREE.Vector2(
                          ( clientX - _this.screen.offsetLeft ) / _this.radius * 0.5,
                          ( clientY - _this.screen.offsetTop ) / _this.radius * 0.5
                  );
  
          };
  
          this.getMouseProjectionOnBall = function ( clientX, clientY ) {
  
                  var mouseOnBall = new THREE.Vector3(
                          ( clientX - _this.screen.width * 0.5 - _this.screen.offsetLeft ) / _this.radius,
                          ( _this.screen.height * 0.5 + _this.screen.offsetTop - clientY ) / _this.radius,
                          0.0
                  );
  
                  var length = mouseOnBall.length();
  
                  if ( length > 1.0 ) {
  
                          mouseOnBall.normalize();
  
                  } else {
  
                          mouseOnBall.z = Math.sqrt( 1.0 - length * length );
  
                  }
  
                  _eye.copy( _this.object.position ).sub( _this.target );
  
                  var projection = _this.object.up.clone().setLength( mouseOnBall.y );
                  projection.add( _this.object.up.clone().cross( _eye ).setLength( mouseOnBall.x ) );
                  projection.add( _eye.setLength( mouseOnBall.z ) );
  
                  return projection;
  
          };
  
          this.rotateCamera = function () {
  
                  var angle = Math.acos( _rotateStart.dot( _rotateEnd ) / _rotateStart.length() / _rotateEnd.length() );
  
                  if ( angle ) {
  
                          var axis = ( new THREE.Vector3() ).crossVectors( _rotateStart, _rotateEnd ).normalize(),
                                  quaternion = new THREE.Quaternion();
  
                          angle *= _this.rotateSpeed;
  
                          quaternion.setFromAxisAngle( axis, -angle );
  
                          _eye.applyQuaternion( quaternion );
                          _this.object.up.applyQuaternion( quaternion );
  
                          _rotateEnd.applyQuaternion( quaternion );
  
                          if ( _this.staticMoving ) {
  
                                  _rotateStart.copy( _rotateEnd );
  
                          } else {
  
                                  quaternion.setFromAxisAngle( axis, angle * ( _this.dynamicDampingFactor - 1.0 ) );
                                  _rotateStart.applyQuaternion( quaternion );
  
                          }
  
                  }
  
          };
  
          this.zoomCamera = function () {
  
                  if ( _state === STATE.TOUCH_ZOOM ) {
  
                          var factor = _touchZoomDistanceStart / _touchZoomDistanceEnd;
                          _touchZoomDistanceStart = _touchZoomDistanceEnd;
                          _eye.multiplyScalar( factor );
  
                  } else {
  
                          var factor = 1.0 + ( _zoomEnd.y - _zoomStart.y ) * _this.zoomSpeed;
  
                          if ( factor !== 1.0 && factor > 0.0 ) {
  
                                  _eye.multiplyScalar( factor );
  
                                  if ( _this.staticMoving ) {
  
                                          _zoomStart.copy( _zoomEnd );
  
                                  } else {
  
                                          _zoomStart.y += ( _zoomEnd.y - _zoomStart.y ) * this.dynamicDampingFactor;
  
                                  }
  
                          }
  
                  }
  
          };
  
          this.panCamera = function () {
  
                  var mouseChange = _panEnd.clone().sub( _panStart );
  
                  if ( mouseChange.lengthSq() ) {
  
                          mouseChange.multiplyScalar( _eye.length() * _this.panSpeed );
  
                          var pan = _eye.clone().cross( _this.object.up ).setLength( mouseChange.x );
                          pan.add( _this.object.up.clone().setLength( mouseChange.y ) );
  
                          _this.object.position.add( pan );
                          _this.target.add( pan );
  
                          if ( _this.staticMoving ) {
  
                                  _panStart = _panEnd;
  
                          } else {
  
                                  _panStart.add( mouseChange.subVectors( _panEnd, _panStart ).multiplyScalar( _this.dynamicDampingFactor ) );
  
                          }
  
                  }
  
          };
  
          this.checkDistances = function () {
  
                  if ( !_this.noZoom || !_this.noPan ) {
  
                          if ( _this.object.position.lengthSq() > _this.maxDistance * _this.maxDistance ) {
  
                                  _this.object.position.setLength( _this.maxDistance );
  
                          }
  
                          if ( _eye.lengthSq() < _this.minDistance * _this.minDistance ) {
  
                                  _this.object.position.addVectors( _this.target, _eye.setLength( _this.minDistance ) );
  
                          }
  
                  }
  
          };
  
          this.update = function () {
  
                  _eye.subVectors( _this.object.position, _this.target );
  
                  if ( !_this.noRotate ) {
  
                          _this.rotateCamera();
  
                  }
  
                  if ( !_this.noZoom ) {
  
                          _this.zoomCamera();
  
                  }
  
                  if ( !_this.noPan ) {
  
                          _this.panCamera();
  
                  }
  
                  _this.object.position.addVectors( _this.target, _eye );
  
                  _this.checkDistances();
  
                  _this.object.lookAt( _this.target );
  
                  if ( lastPosition.distanceToSquared( _this.object.position ) > 0 ) {
  
                          _this.dispatchEvent( changeEvent );
  
                          lastPosition.copy( _this.object.position );
  
                  }
  
          };
  
          this.reset = function () {
  
                  _state = STATE.NONE;
                  _prevState = STATE.NONE;
  
                  _this.target.copy( _this.target0 );
                  _this.object.position.copy( _this.position0 );
                  _this.object.up.copy( _this.up0 );
  
                  _eye.subVectors( _this.object.position, _this.target );
  
                  _this.object.lookAt( _this.target );
  
                  _this.dispatchEvent( changeEvent );
  
                  lastPosition.copy( _this.object.position );
  
          };
  
          // listeners
  
          function keydown( event ) {
  
                  if ( _this.enabled === false ) return;
  
                  window.removeEventListener( 'keydown', keydown );
  
                  _prevState = _state;
  
                  if ( _state !== STATE.NONE ) {
  
                          return;
  
                  } else if ( event.keyCode === _this.keys[ STATE.ROTATE ] && !_this.noRotate ) {
  
                          _state = STATE.ROTATE;
  
                  } else if ( event.keyCode === _this.keys[ STATE.ZOOM ] && !_this.noZoom ) {
  
                          _state = STATE.ZOOM;
  
                  } else if ( event.keyCode === _this.keys[ STATE.PAN ] && !_this.noPan ) {
  
                          _state = STATE.PAN;
  
                  }
  
          }
  
          function keyup( event ) {
  
                  if ( _this.enabled === false ) return;
  
                  _state = _prevState;
  
                  window.addEventListener( 'keydown', keydown, false );
  
          }
  
          function mousedown( event ) {
  
                  if ( _this.enabled === false ) return;
  
                  event.preventDefault();
                  event.stopPropagation();
  
                  if ( _state === STATE.NONE ) {
  
                          _state = event.button;
  
                  }
  
                  if ( _state === STATE.ROTATE && !_this.noRotate ) {
  
                          _rotateStart = _rotateEnd = _this.getMouseProjectionOnBall( event.clientX, event.clientY );
  
                  } else if ( _state === STATE.ZOOM && !_this.noZoom ) {
  
                          _zoomStart = _zoomEnd = _this.getMouseOnScreen( event.clientX, event.clientY );
  
                  } else if ( _state === STATE.PAN && !_this.noPan ) {
  
                          _panStart = _panEnd = _this.getMouseOnScreen( event.clientX, event.clientY );
  
                  }
  
                  document.addEventListener( 'mousemove', mousemove, false );
                  document.addEventListener( 'mouseup', mouseup, false );
  
          }
  
          function mousemove( event ) {
  
                  if ( _this.enabled === false ) return;
  
                  event.preventDefault();
                  event.stopPropagation();
  
                  if ( _state === STATE.ROTATE && !_this.noRotate ) {
  
                          _rotateEnd = _this.getMouseProjectionOnBall( event.clientX, event.clientY );
  
                  } else if ( _state === STATE.ZOOM && !_this.noZoom ) {
  
                          _zoomEnd = _this.getMouseOnScreen( event.clientX, event.clientY );
  
                  } else if ( _state === STATE.PAN && !_this.noPan ) {
  
                          _panEnd = _this.getMouseOnScreen( event.clientX, event.clientY );
  
                  }
  
          }
  
          function mouseup( event ) {
  
                  if ( _this.enabled === false ) return;
  
                  event.preventDefault();
                  event.stopPropagation();
  
                  _state = STATE.NONE;
  
                  document.removeEventListener( 'mousemove', mousemove );
                  document.removeEventListener( 'mouseup', mouseup );
  
          }
  
          function mousewheel( event ) {
  
                  if ( _this.enabled === false ) return;
  
                  event.preventDefault();
                  event.stopPropagation();
  
                  var delta = 0;
  
                  if ( event.wheelDelta ) { // WebKit / Opera / Explorer 9
  
                          delta = event.wheelDelta / 40;
  
                  } else if ( event.detail ) { // Firefox
  
                          delta = - event.detail / 3;
  
                  }
  
                  _zoomStart.y += ( 1 / delta ) * 0.05;
  
          }
  
          function touchstart( event ) {
  
                  if ( _this.enabled === false ) return;
  
                  switch ( event.touches.length ) {
  
                          case 1:
                                  _state = STATE.TOUCH_ROTATE;
                                  _rotateStart = _rotateEnd = _this.getMouseProjectionOnBall( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );
                                  break;
  
                          case 2:
                                  _state = STATE.TOUCH_ZOOM;
                                  var dx = event.touches[ 0 ].pageX - event.touches[ 1 ].pageX;
                                  var dy = event.touches[ 0 ].pageY - event.touches[ 1 ].pageY;
                                  _touchZoomDistanceEnd = _touchZoomDistanceStart = Math.sqrt( dx * dx + dy * dy );
                                  break;
  
                          case 3:
                                  _state = STATE.TOUCH_PAN;
                                  _panStart = _panEnd = _this.getMouseOnScreen( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );
                                  break;
  
                          default:
                                  _state = STATE.NONE;
  
                  }
  
          }
  
          function touchmove( event ) {
  
                  if ( _this.enabled === false ) return;
  
                  event.preventDefault();
                  event.stopPropagation();
  
                  switch ( event.touches.length ) {
  
                          case 1:
                                  _rotateEnd = _this.getMouseProjectionOnBall( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );
                                  break;
  
                          case 2:
                                  var dx = event.touches[ 0 ].pageX - event.touches[ 1 ].pageX;
                                  var dy = event.touches[ 0 ].pageY - event.touches[ 1 ].pageY;
                                  _touchZoomDistanceEnd = Math.sqrt( dx * dx + dy * dy )
                                  break;
  
                          case 3:
                                  _panEnd = _this.getMouseOnScreen( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );
                                  break;
  
                          default:
                                  _state = STATE.NONE;
  
                  }
  
          }
  
          function touchend( event ) {
  
                  if ( _this.enabled === false ) return;
  
                  switch ( event.touches.length ) {
  
                          case 1:
                                  _rotateStart = _rotateEnd = _this.getMouseProjectionOnBall( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );
                                  break;
  
                          case 2:
                                  _touchZoomDistanceStart = _touchZoomDistanceEnd = 0;
                                  break;
  
                          case 3:
                                  _panStart = _panEnd = _this.getMouseOnScreen( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );
                                  break;
  
                  }
  
                  _state = STATE.NONE;
  
          }
  
          this.domElement.addEventListener( 'contextmenu', function ( event ) { event.preventDefault(); }, false );
  
          this.domElement.addEventListener( 'mousedown', mousedown, false );
  
          this.domElement.addEventListener( 'mousewheel', mousewheel, false );
          this.domElement.addEventListener( 'DOMMouseScroll', mousewheel, false ); // firefox
  
          this.domElement.addEventListener( 'touchstart', touchstart, false );
          this.domElement.addEventListener( 'touchend', touchend, false );
          this.domElement.addEventListener( 'touchmove', touchmove, false );
  
          window.addEventListener( 'keydown', keydown, false );
          window.addEventListener( 'keyup', keyup, false );
  
          this.handleResize();
  
  };
  


(C) Æliens 04/09/2009

You may not copy or print any of this material without explicit permission of the author or the publisher. In case of other copyright issues, contact the author.