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LeapObjectControls.js
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LeapObjectControls.js
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/*
* @author Torsten Sprenger / http://torstensprenger.com
*
* Leap Object Controls (http://leapmotion.com)
*
*/
THREE.LeapObjectControls = function(camera, object) {
var _this = this;
this.camera = camera;
this.object = object;
// api
this.enabled = true;
this.step = (camera.position.z == 0 ? Math.pow(10, (Math.log(camera.near) + Math.log(camera.far))/Math.log(10))/10.0 : camera.position.z);
this.fingerFactor = 2;
// `...Hands` : integer or range given as an array of length 2
// `...Fingers` : integer or range given as an array of length 2
// `...RightHanded` : boolean indicating whether to use left or right hand for controlling (if number of hands > 1)
// `...HandPosition`: boolean indicating whether to use palm position or finger tip position (if number of fingers == 1)
// `...Stabilized` : boolean indicating whether to use stabilized palm/finger tip position or not
// rotation
this.rotateEnabled = true;
this.rotateSpeed = 4.0;
this.rotateHands = 1;
this.rotateFingers = [2, 3];
this.rotateRightHanded = true;
this.rotateHandPosition = true;
this.rotateStabilized = false;
this.rotateMin = 0;
this.rotateMax = Math.PI;
// Don't need this function for SIFT app
// scale
this.scaleEnabled = true;
this.scaleSpeed = 1.0;
this.scaleHands = 1;
this.scaleFingers = [4, 5];
this.scaleRightHanded = true;
this.scaleHandPosition = true;
this.scaleStabilized = false;
this.scaleMin = 0.1;
this.scaleMax = 10;
// pan
this.panEnabled = true;
this.panSpeed = 1.0;
this.panHands = 2;
this.panFingers = [6, 12];
this.panRightHanded = true;
this.panHandPosition = true;
this.panStabilized = false;
// internals
var _rotateXLast = null;
var _rotateYLast = null;
var _scaleZLast = null;
var _panXLast = null;
var _panYLast = null;
var _panZLast = null;
// helpers
this.transformFactor = function(action) {
switch(action) {
case 'rotate':
return _this.rotateSpeed * (_this.rotateHandPosition ? 1 : _this.fingerFactor);
case 'scale':
return _this.scaleSpeed * (_this.scaleHandPosition ? 1 : _this.fingerFactor);
case 'pan':
return _this.panSpeed * (_this.panHandPosition ? 1 : _this.fingerFactor);
};
};
this.rotateTransform = function(delta) {
return _this.transformFactor('rotate') * THREE.Math.mapLinear(delta, -400, 400, -Math.PI, Math.PI);
};
this.scaleTransform = function(delta) {
return _this.transformFactor('scale') * THREE.Math.mapLinear(delta, -400, 400, -2, 2);
};
this.panTransform = function(delta) {
return _this.transformFactor('pan') * THREE.Math.mapLinear(delta, -400, 400, -_this.step, _this.step);
};
this.applyGesture = function(frame, action) {
var hl = frame.hands.length;
var fl = frame.pointables.length;
switch(action) {
case 'rotate':
if (_this.rotateHands instanceof Array) {
if (_this.rotateFingers instanceof Array) {
if (_this.rotateHands[0] <= hl && hl <= _this.rotateHands[1] && _this.rotateFingers[0] <= fl && fl <= _this.rotateFingers[1]) return true;
} else {
if (_this.rotateHands[0] <= hl && hl <= _this.rotateHands[1] && _this.rotateFingers == fl) return true;
};
} else {
if (_this.rotateFingers instanceof Array) {
if (_this.rotateHands == hl && _this.rotateFingers[0] <= fl && fl <= _this.rotateFingers[1]) return true;
} else {
if (_this.rotateHands == hl && _this.rotateFingers == fl) return true;
};
};
break;
case 'scale':
if (_this.scaleHands instanceof Array) {
if (_this.scaleFingers instanceof Array) {
if (_this.scaleHands[0] <= hl && hl <= _this.scaleHands[1] && _this.scaleFingers[0] <= fl && fl <= _this.scaleFingers[1]) return true;
} else {
if (_this.scaleHands[0] <= hl && hl <= _this.scaleHands[1] && _this.scaleFingers == fl) return true;
};
} else {
if (_this.scaleFingers instanceof Array) {
if (_this.scaleHands == hl && _this.scaleFingers[0] <= fl && fl <= _this.scaleFingers[1]) return true;
} else {
if (_this.scaleHands == hl && _this.scaleFingers == fl) return true;
};
};
break;
case 'pan':
if (_this.panHands instanceof Array) {
if (_this.panFingers instanceof Array) {
if (_this.panHands[0] <= hl && hl <= _this.panHands[1] && _this.panFingers[0] <= fl && fl <= _this.panFingers[1]) return true;
} else {
if (_this.panHands[0] <= hl && hl <= _this.panHands[1] && _this.panFingers == fl) return true;
};
} else {
if (_this.panFingers instanceof Array) {
if (_this.panHands == hl && _this.panFingers[0] <= fl && fl <= _this.panFingers[1]) return true;
} else {
if (_this.panHands == hl && _this.panFingers == fl) return true;
};
};
break;
};
return false;
};
this.hand = function(frame, action) {
var hds = frame.hands;
if (hds.length > 0) {
if (hds.length == 1) {
return hds[0];
} else if (hds.length == 2) {
var lh, rh;
if (hds[0].palmPosition[0] < hds[1].palmPosition[0]) {
lh = hds[0];
rh = hds[1];
} else {
lh = hds[1];
rh = hds[0];
}
switch(action) {
case 'rotate':
if (_this.rotateRightHanded) {
return rh;
} else {
return lh;
};
case 'scale':
if (_this.scaleRightHanded) {
return rh;
} else {
return lh;
};
case 'pan':
if (_this.panRightHanded) {
return rh;
} else {
return lh;
};
};
};
};
return false;
};
this.position = function(frame, action) {
// assertion: if `...HandPosition` is false, then `...Fingers` needs to be 1 or [1, 1]
var h;
switch(action) {
case 'rotate':
h = _this.hand(frame, 'rotate');
return (_this.rotateHandPosition
? (_this.rotateStabilized ? h.stabilizedPalmPosition : h.palmPosition)
: (_this.rotateStabilized ? frame.pointables[0].stabilizedTipPosition : frame.pointables[0].tipPosition)
);
case 'scale':
h = _this.hand(frame, 'scale');
return (_this.scaleHandPosition
? (_this.scaleStabilized ? h.stabilizedPalmPosition : h.palmPosition)
: (_this.scaleStabilized ? frame.pointables[0].stabilizedTipPosition : frame.pointables[0].tipPosition)
);
case 'pan':
h = _this.hand(frame, 'pan');
return (_this.panHandPosition
? (_this.panStabilized ? h.stabilizedPalmPosition : h.palmPosition)
: (_this.panStabilized ? frame.pointables[0].stabilizedTipPosition : frame.pointables[0].tipPosition)
);
};
};
// methods
this.rotateObject = function(frame) {
if (_this.rotateEnabled && _this.applyGesture(frame, 'rotate')) {
// rotate around axis in xy-plane which is orthogonal to camera vector
var y = _this.position(frame, 'rotate')[1];
if (!_rotateYLast) _rotateYLast = y;
var yDelta = y - _rotateYLast;
// TODO: apply correct rotation to object
//
// var t = new THREE.Vector3().subVectors(_this.camera.position, _this.object.position);
// angleDelta = _this.rotateTransform(yDelta);
// newAngle = t.angleTo(new THREE.Vector3(0, 1, 0)) + angleDelta;
// if (_this.rotateMin < newAngle && newAngle < _this.rotateMax) {
// var n = new THREE.Vector3(t.z, 0, -t.x).normalize();
// var rotationMatrix = new THREE.Matrix4();
// rotationMatrix.makeRotationAxis(n, angleDelta);
// rotationMatrix.multiply(_this.object.matrix);
// _this.object.rotation.setFromRotationMatrix(rotationMatrix, _this.camera.rotation.order);
// };
// rotate around y-axis
var x = _this.position(frame, 'rotate')[0];
if (!_rotateXLast) _rotateXLast = x;
var xDelta = x - _rotateXLast;
_this.object.rotation.y += _this.rotateTransform(xDelta);
_rotateYLast = y;
_rotateXLast = x;
_scaleZLast = null;
_panXLast = null;
_panYLast = null;
_panZLast = null;
} else {
_rotateYLast = null;
_rotateXLast = null;
};
};
this.scaleObject = function(frame) {
if (_this.scaleEnabled && _this.applyGesture(frame, 'scale')) {
var z = _this.position(frame, 'scale')[2];
if (!_scaleZLast) _scaleZLast = z;
var zDelta = z - _scaleZLast;
scaleDelta = _this.scaleTransform(zDelta);
var newScale = _this.object.scale.x + scaleDelta;
if (_this.scaleMin < newScale && newScale < _this.scaleMax) {
_this.object.scale = new THREE.Vector3(newScale, newScale, newScale);
};
_scaleZLast = z;
_rotateXLast = null;
_rotateYLast = null;
_panXLast = null;
_panYLast = null;
_panZLast = null;
} else {
_scaleZLast = null;
};
};
this.panObject = function(frame) {
if (_this.panEnabled && _this.applyGesture(frame, 'pan')) {
console.log("panning object");
var x = _this.position(frame, 'pan')[0];
var y = _this.position(frame, 'pan')[1];
var z = _this.position(frame, 'pan')[2];
if (!_panXLast) _panXLast = x;
if (!_panYLast) _panYLast = y;
if (!_panZLast) _panZLast = z;
var xDelta = x - _panXLast;
var yDelta = y - _panYLast;
var zDelta = z - _panZLast;
var v = _this.camera.localToWorld(new THREE.Vector3(_this.panTransform(xDelta), _this.panTransform(yDelta), _this.panTransform(zDelta)));
v.sub(_this.camera.position);
_this.object.position.add(v);
_panXLast = x;
_panYLast = y;
_panZLast = z;
_rotateXLast = null;
_rotateYLast = null;
_scaleZLast = null;
} else {
_panXLast = null;
_panYLast = null;
_panZLast = null;
};
};
this.update = function(frame) {
if (_this.enabled) {
_this.rotateObject(frame);
// _this.scaleObject(frame);
_this.panObject(frame);
};
};
};