OrthographicTrackballControls.js

/**
 * @author Eberhard Graether / http://egraether.com/
 * @author Mark Lundin 	/ http://mark-lundin.com
 * @author Patrick Fuller / http://patrick-fuller.com
 * @author Max Smolens / https://github.com/msmolens
 */
(function (root, factory) {
  if (typeof exports === 'object') {
    // CommonJS
    module.exports = factory();
  } else if (typeof define === 'function' && define.amd) {
    // AMD
    define([], function () {
      return root.OrthographicTrackballControls = factory();
    });
  } else {
    // Global Variables
    root.OrthographicTrackballControls = factory();
  }
}(this, function () {
  'use strict';

  var OrthographicTrackballControls = function (object, domElement) {

    var _this = this;
    var STATE = { NONE: - 1, ROTATE: 0, ZOOM: 1, PAN: 2, TOUCH_ROTATE: 3, TOUCH_ZOOM_PAN: 4 };

    this.object = object;
    this.domElement = (domElement !== undefined) ? domElement : document;

    // API

    this.enabled = true;

    this.screen = { left: 0, top: 0, width: 0, height: 0 };

    this.radius = 0;

    this.rotateSpeed = 1.0;
    this.zoomSpeed = 1.2;

    this.noRotate = false;
    this.noZoom = false;
    this.noPan = false;
    this.noRoll = false;

    this.staticMoving = false;
    this.dynamicDampingFactor = 0.2;

    this.keys = [65 /*A*/, 83 /*S*/, 68 /*D*/];

    // internals

    this.target = new THREE.Vector3();

    var EPS = 0.000001;

    var _changed = true;

    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();

    this.left0 = this.object.left;
    this.right0 = this.object.right;
    this.top0 = this.object.top;
    this.bottom0 = this.object.bottom;

    // events

    var changeEvent = { type: 'change' };
    var startEvent = { type: 'start' };
    var endEvent = { type: 'end' };


    // methods

    this.handleResize = function () {

      if (this.domElement === document) {

        this.screen.left = 0;
        this.screen.top = 0;
        this.screen.width = window.innerWidth;
        this.screen.height = window.innerHeight;

      } else {

        var box = this.domElement.getBoundingClientRect();
        // adjustments come from similar code in the jquery offset() function
        var d = this.domElement.ownerDocument.documentElement;
        this.screen.left = box.left + window.pageXOffset - d.clientLeft;
        this.screen.top = box.top + window.pageYOffset - d.clientTop;
        this.screen.width = box.width;
        this.screen.height = box.height;

      }

      this.radius = 0.5 * Math.min(this.screen.width, this.screen.height);

      this.left0 = this.object.left;
      this.right0 = this.object.right;
      this.top0 = this.object.top;
      this.bottom0 = this.object.bottom;

    };

    this.handleEvent = function (event) {

      if (typeof this[event.type] == 'function') {

        this[event.type](event);

      }

    };

    var getMouseOnScreen = (function () {

      var vector = new THREE.Vector2();

      return function getMouseOnScreen(pageX, pageY) {

        vector.set(
          (pageX - _this.screen.left) / _this.screen.width,
          (pageY - _this.screen.top) / _this.screen.height
        );

        return vector;

      };

    }());

    var getMouseProjectionOnBall = (function () {

      var vector = new THREE.Vector3();
      var objectUp = new THREE.Vector3();
      var mouseOnBall = new THREE.Vector3();

      return function getMouseProjectionOnBall(pageX, pageY) {

        mouseOnBall.set(
          (pageX - _this.screen.width * 0.5 - _this.screen.left) / _this.radius,
          (_this.screen.height * 0.5 + _this.screen.top - pageY) / _this.radius,
          0.0
        );

        var length = mouseOnBall.length();

        if (_this.noRoll) {

          if (length < Math.SQRT1_2) {

            mouseOnBall.z = Math.sqrt(1.0 - length * length);

          } else {

            mouseOnBall.z = .5 / length;

          }

        } else if (length > 1.0) {

          mouseOnBall.normalize();

        } else {

          mouseOnBall.z = Math.sqrt(1.0 - length * length);

        }

        _eye.copy(_this.object.position).sub(_this.target);

        vector.copy(_this.object.up).setLength(mouseOnBall.y);
        vector.add(objectUp.copy(_this.object.up).cross(_eye).setLength(mouseOnBall.x));
        vector.add(_eye.setLength(mouseOnBall.z));

        return vector;

      };

    }());

    this.rotateCamera = (function () {

      var axis = new THREE.Vector3(),
        quaternion = new THREE.Quaternion();


      return function rotateCamera() {

        var angle = Math.acos(_rotateStart.dot(_rotateEnd) / _rotateStart.length() / _rotateEnd.length());

        if (angle) {

          axis.crossVectors(_rotateStart, _rotateEnd).normalize();

          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);

          }

          _changed = true;

        }

      }

    }());

    this.zoomCamera = function () {

      if (_state === STATE.TOUCH_ZOOM_PAN) {

        var factor = _touchZoomDistanceEnd / _touchZoomDistanceStart;
        _touchZoomDistanceStart = _touchZoomDistanceEnd;

        _this.object.zoom *= factor;

        _changed = true;

      } else {

        var factor = 1.0 + (_zoomEnd.y - _zoomStart.y) * _this.zoomSpeed;

        if (Math.abs(factor - 1.0) > EPS && factor > 0.0) {

          _this.object.zoom /= factor;

          if (_this.staticMoving) {

            _zoomStart.copy(_zoomEnd);

          } else {

            _zoomStart.y += (_zoomEnd.y - _zoomStart.y) * this.dynamicDampingFactor;

          }

          _changed = true;

        }

      }

    };

    this.panCamera = (function () {

      var mouseChange = new THREE.Vector2(),
        objectUp = new THREE.Vector3(),
        pan = new THREE.Vector3();

      return function panCamera() {

        mouseChange.copy(_panEnd).sub(_panStart);

        if (mouseChange.lengthSq()) {

          // Scale movement to keep clicked/dragged position under cursor
          var scale_x = (_this.object.right - _this.object.left) / _this.object.zoom;
          var scale_y = (_this.object.top - _this.object.bottom) / _this.object.zoom;
          mouseChange.x *= scale_x;
          mouseChange.y *= scale_y;

          pan.copy(_eye).cross(_this.object.up).setLength(mouseChange.x);
          pan.add(objectUp.copy(_this.object.up).setLength(mouseChange.y));

          _this.object.position.add(pan);
          _this.target.add(pan);

          if (_this.staticMoving) {

            _panStart.copy(_panEnd);

          } else {

            _panStart.add(mouseChange.subVectors(_panEnd, _panStart).multiplyScalar(_this.dynamicDampingFactor));

          }

          _changed = true;

        }

      }

    }());

    this.update = function () {

      _eye.subVectors(_this.object.position, _this.target);

      if (!_this.noRotate) {

        _this.rotateCamera();

      }

      if (!_this.noZoom) {

        _this.zoomCamera();

        if (_changed) {

          _this.object.updateProjectionMatrix();

        }

      }

      if (!_this.noPan) {

        _this.panCamera();

      }

      _this.object.position.addVectors(_this.target, _eye);

      _this.object.lookAt(_this.target);

      if (_changed) {

        _this.dispatchEvent(changeEvent);

        _changed = false;

      }

    };

    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.left = _this.left0;
      _this.object.right = _this.right0;
      _this.object.top = _this.top0;
      _this.object.bottom = _this.bottom0;

      _this.object.lookAt(_this.target);

      _this.dispatchEvent(changeEvent);

      _changed = false;

    };

    // 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.copy(getMouseProjectionOnBall(event.pageX, event.pageY));
        _rotateEnd.copy(_rotateStart);

      } else if (_state === STATE.ZOOM && !_this.noZoom) {

        _zoomStart.copy(getMouseOnScreen(event.pageX, event.pageY));
        _zoomEnd.copy(_zoomStart);

      } else if (_state === STATE.PAN && !_this.noPan) {

        _panStart.copy(getMouseOnScreen(event.pageX, event.pageY));
        _panEnd.copy(_panStart)

      }

      document.addEventListener('mousemove', mousemove, false);
      document.addEventListener('mouseup', mouseup, false);

      _this.dispatchEvent(startEvent);

    }

    function mousemove(event) {

      if (_this.enabled === false) return;

      event.preventDefault();
      event.stopPropagation();

      if (_state === STATE.ROTATE && !_this.noRotate) {

        _rotateEnd.copy(getMouseProjectionOnBall(event.pageX, event.pageY));

      } else if (_state === STATE.ZOOM && !_this.noZoom) {

        _zoomEnd.copy(getMouseOnScreen(event.pageX, event.pageY));

      } else if (_state === STATE.PAN && !_this.noPan) {

        _panEnd.copy(getMouseOnScreen(event.pageX, event.pageY));

      }

    }

    function mouseup(event) {

      if (_this.enabled === false) return;

      event.preventDefault();
      event.stopPropagation();

      _state = STATE.NONE;

      document.removeEventListener('mousemove', mousemove);
      document.removeEventListener('mouseup', mouseup);
      _this.dispatchEvent(endEvent);

    }

    function mousewheel(event) {

      if (_this.enabled === false) return;

      event.preventDefault();
      event.stopPropagation();

      _zoomStart.y += event.deltaY * 0.01;
      _this.dispatchEvent(startEvent);
      _this.dispatchEvent(endEvent);

    }

    function touchstart(event) {

      if (_this.enabled === false) return;

      switch (event.touches.length) {

        case 1:
          _state = STATE.TOUCH_ROTATE;
          _rotateStart.copy(getMouseProjectionOnBall(event.touches[0].pageX, event.touches[0].pageY));
          _rotateEnd.copy(_rotateStart);
          break;

        case 2:
          _state = STATE.TOUCH_ZOOM_PAN;
          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);

          var x = (event.touches[0].pageX + event.touches[1].pageX) / 2;
          var y = (event.touches[0].pageY + event.touches[1].pageY) / 2;
          _panStart.copy(getMouseOnScreen(x, y));
          _panEnd.copy(_panStart);
          break;

        default:
          _state = STATE.NONE;

      }
      _this.dispatchEvent(startEvent);

    }

    function touchmove(event) {

      if (_this.enabled === false) return;

      event.preventDefault();
      event.stopPropagation();

      switch (event.touches.length) {

        case 1:
          _rotateEnd.copy(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);

          var x = (event.touches[0].pageX + event.touches[1].pageX) / 2;
          var y = (event.touches[0].pageY + event.touches[1].pageY) / 2;
          _panEnd.copy(getMouseOnScreen(x, y));
          break;

        default:
          _state = STATE.NONE;

      }

    }

    function touchend(event) {

      if (_this.enabled === false) return;

      switch (event.touches.length) {

        case 1:
          _rotateEnd.copy(getMouseProjectionOnBall(event.touches[0].pageX, event.touches[0].pageY));
          _rotateStart.copy(_rotateEnd);
          break;

        case 2:
          _touchZoomDistanceStart = _touchZoomDistanceEnd = 0;

          var x = (event.touches[0].pageX + event.touches[1].pageX) / 2;
          var y = (event.touches[0].pageY + event.touches[1].pageY) / 2;
          _panEnd.copy(getMouseOnScreen(x, y));
          _panStart.copy(_panEnd);
          break;

      }

      _state = STATE.NONE;
      _this.dispatchEvent(endEvent);

    }

    function contextmenu(event) {

      event.preventDefault();

    }

    this.dispose = function () {

      this.domElement.removeEventListener('contextmenu', contextmenu, false);
      this.domElement.removeEventListener('mousedown', mousedown, false);
      this.domElement.removeEventListener('wheel', mousewheel, false);

      this.domElement.removeEventListener('touchstart', touchstart, false);
      this.domElement.removeEventListener('touchend', touchend, false);
      this.domElement.removeEventListener('touchmove', touchmove, false);

      document.removeEventListener('mousemove', mousemove, false);
      document.removeEventListener('mouseup', mouseup, false);

      window.removeEventListener('keydown', keydown, false);
      window.removeEventListener('keyup', keyup, false);

    };

    this.domElement.addEventListener('contextmenu', contextmenu, false);
    this.domElement.addEventListener('mousedown', mousedown, false);
    this.domElement.addEventListener('wheel', mousewheel, false);

    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();

    // force an update at start
    this.update();

  };

  OrthographicTrackballControls.prototype = Object.create(THREE.EventDispatcher.prototype);
  OrthographicTrackballControls.prototype.constructor = OrthographicTrackballControls;

  return OrthographicTrackballControls;
}));