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OrbitControls.js

/**
 * @author qiao / https://github.com/qiao
 * @author mrdoob / http://mrdoob.com
 * @author alteredq / http://alteredqualia.com/
 * @author WestLangley / http://github.com/WestLangley
 * @author erich666 / http://erichaines.com
 */
/*global THREE, console */

// This set of controls performs orbiting, dollying (zooming), and panning. It maintains
// the "up" direction as +Y, unlike the TrackballControls. Touch on tablet and phones is
// supported.
//
//    Orbit - left mouse / touch: one finger move
//    Zoom - middle mouse, or mousewheel / touch: two finger spread or squish
//    Pan - right mouse, or arrow keys / touch: three finter swipe
//
// This is a drop-in replacement for (most) TrackballControls used in examples.
// That is, include this js file and wherever you see:
//    	controls = new THREE.TrackballControls( camera );
//      controls.target.z = 150;
// Simple substitute "OrbitControls" and the control should work as-is.

THREE.OrbitControls = function ( object, domElement ) {

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

// API

// Set to false to disable this control
	this.enabled = true;

// "target" sets the location of focus, where the control orbits around
	// and where it pans with respect to.
	this.target = new THREE.Vector3();
	// center is old, deprecated; use "target" instead
	this.center = this.target;

// This option actually enables dollying in and out; left as "zoom" for
	// backwards compatibility
	this.noZoom = false;
	this.zoomSpeed = 1.0;
	// Limits to how far you can dolly in and out
	this.minDistance = 0;
	this.maxDistance = Infinity;

// Set to true to disable this control
	this.noRotate = false;
	this.rotateSpeed = 1.0;

// Set to true to disable this control
	this.noPan = false;
	this.keyPanSpeed = 7.0;	// pixels moved per arrow key push

// Set to true to automatically rotate around the target
	this.autoRotate = false;
	this.autoRotateSpeed = 2.0; // 30 seconds per round when fps is 60

// How far you can orbit vertically, upper and lower limits.
	// Range is 0 to Math.PI radians.
	this.minPolarAngle = 0; // radians
	this.maxPolarAngle = Math.PI; // radians

// Set to true to disable use of the keys
	this.noKeys = false;
	// The four arrow keys
	this.keys = { LEFT: 37, UP: 38, RIGHT: 39, BOTTOM: 40 };

////////////
	// internals

var scope = this;

var EPS = 0.000001;

var rotateStart = new THREE.Vector2();
	var rotateEnd = new THREE.Vector2();
	var rotateDelta = new THREE.Vector2();

var panStart = new THREE.Vector2();
	var panEnd = new THREE.Vector2();
	var panDelta = new THREE.Vector2();

var dollyStart = new THREE.Vector2();
	var dollyEnd = new THREE.Vector2();
	var dollyDelta = new THREE.Vector2();

var phiDelta = 0;
	var thetaDelta = 0;
	var scale = 1;
	var pan = new THREE.Vector3();

var lastPosition = new THREE.Vector3();

var STATE = { NONE : -1, ROTATE : 0, DOLLY : 1, PAN : 2, TOUCH_ROTATE : 3, TOUCH_DOLLY : 4, TOUCH_PAN : 5 };
	var state = STATE.NONE;

// events

var changeEvent = { type: 'change' };

this.rotateLeft = function ( angle ) {

if ( angle === undefined ) {

angle = getAutoRotationAngle();

}

thetaDelta -= angle;

};

this.rotateUp = function ( angle ) {

if ( angle === undefined ) {

angle = getAutoRotationAngle();

}

phiDelta -= angle;

};

// pass in distance in world space to move left
	this.panLeft = function ( distance ) {

var panOffset = new THREE.Vector3();
		var te = this.object.matrix.elements;
		// get X column of matrix
		panOffset.set( te[0], te[1], te[2] );
		panOffset.multiplyScalar(-distance);
		
		pan.add( panOffset );

};

// pass in distance in world space to move up
	this.panUp = function ( distance ) {

var panOffset = new THREE.Vector3();
		var te = this.object.matrix.elements;
		// get Y column of matrix
		panOffset.set( te[4], te[5], te[6] );
		panOffset.multiplyScalar(distance);
		
		pan.add( panOffset );
	};
	
	// main entry point; pass in Vector2 of change desired in pixel space,
	// right and down are positive
	this.pan = function ( delta ) {

var element = scope.domElement === document ? scope.domElement.body : scope.domElement;

if ( scope.object.fov !== undefined ) {

// perspective
			var position = scope.object.position;
			var offset = position.clone().sub( scope.target );
			var targetDistance = offset.length();

// half of the fov is center to top of screen
			targetDistance *= Math.tan( (scope.object.fov/2) * Math.PI / 180.0 );
			// we actually don't use screenWidth, since perspective camera is fixed to screen height
			scope.panLeft( 2 * delta.x * targetDistance / element.clientHeight );
			scope.panUp( 2 * delta.y * targetDistance / element.clientHeight );

} else if ( scope.object.top !== undefined ) {

// orthographic
			scope.panLeft( delta.x * (scope.object.right - scope.object.left) / element.clientWidth );
			scope.panUp( delta.y * (scope.object.top - scope.object.bottom) / element.clientHeight );

} else {

// camera neither orthographic or perspective - warn user
			console.warn( 'WARNING: OrbitControls.js encountered an unknown camera type - pan disabled.' );

}

};

this.dollyIn = function ( dollyScale ) {

if ( dollyScale === undefined ) {

dollyScale = getZoomScale();

}

scale /= dollyScale;

};

this.dollyOut = function ( dollyScale ) {

if ( dollyScale === undefined ) {

dollyScale = getZoomScale();

}

scale *= dollyScale;

};

this.update = function () {

var position = this.object.position;
		var offset = position.clone().sub( this.target );

// angle from z-axis around y-axis

var theta = Math.atan2( offset.x, offset.z );

// angle from y-axis

var phi = Math.atan2( Math.sqrt( offset.x * offset.x + offset.z * offset.z ), offset.y );

if ( this.autoRotate ) {

this.rotateLeft( getAutoRotationAngle() );

}

theta += thetaDelta;
		phi += phiDelta;

// restrict phi to be between desired limits
		phi = Math.max( this.minPolarAngle, Math.min( this.maxPolarAngle, phi ) );

// restrict phi to be betwee EPS and PI-EPS
		phi = Math.max( EPS, Math.min( Math.PI - EPS, phi ) );

var radius = offset.length() * scale;

// restrict radius to be between desired limits
		radius = Math.max( this.minDistance, Math.min( this.maxDistance, radius ) );
		
		// move target to panned location
		this.target.add( pan );

offset.x = radius * Math.sin( phi ) * Math.sin( theta );
		offset.y = radius * Math.cos( phi );
		offset.z = radius * Math.sin( phi ) * Math.cos( theta );

position.copy( this.target ).add( offset );

this.object.lookAt( this.target );

thetaDelta = 0;
		phiDelta = 0;
		scale = 1;
		pan.set(0,0,0);

if ( lastPosition.distanceTo( this.object.position ) > 0 ) {

this.dispatchEvent( changeEvent );

lastPosition.copy( this.object.position );

}

};

function getAutoRotationAngle() {

return 2 * Math.PI / 60 / 60 * scope.autoRotateSpeed;

}

function getZoomScale() {

return Math.pow( 0.95, scope.zoomSpeed );

}

function onMouseDown( event ) {

if ( scope.enabled === false ) { return; }
		event.preventDefault();

if ( event.button === 0 ) {
			if ( scope.noRotate === true ) { return; }

state = STATE.ROTATE;

rotateStart.set( event.clientX, event.clientY );

} else if ( event.button === 1 ) {
			if ( scope.noZoom === true ) { return; }

state = STATE.DOLLY;

dollyStart.set( event.clientX, event.clientY );

} else if ( event.button === 2 ) {
			if ( scope.noPan === true ) { return; }

state = STATE.PAN;

panStart.set( event.clientX, event.clientY );

}

// Greggman fix: https://github.com/greggman/three.js/commit/fde9f9917d6d8381f06bf22cdff766029d1761be
		scope.domElement.addEventListener( 'mousemove', onMouseMove, false );
		scope.domElement.addEventListener( 'mouseup', onMouseUp, false );

}

function onMouseMove( event ) {

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

event.preventDefault();

var element = scope.domElement === document ? scope.domElement.body : scope.domElement;

if ( state === STATE.ROTATE ) {

if ( scope.noRotate === true ) return;

rotateEnd.set( event.clientX, event.clientY );
			rotateDelta.subVectors( rotateEnd, rotateStart );

// rotating across whole screen goes 360 degrees around
			scope.rotateLeft( 2 * Math.PI * rotateDelta.x / element.clientWidth * scope.rotateSpeed );
			// rotating up and down along whole screen attempts to go 360, but limited to 180
			scope.rotateUp( 2 * Math.PI * rotateDelta.y / element.clientHeight * scope.rotateSpeed );

rotateStart.copy( rotateEnd );

} else if ( state === STATE.DOLLY ) {

if ( scope.noZoom === true ) return;

dollyEnd.set( event.clientX, event.clientY );
			dollyDelta.subVectors( dollyEnd, dollyStart );

if ( dollyDelta.y > 0 ) {

scope.dollyIn();

} else {

scope.dollyOut();

}

dollyStart.copy( dollyEnd );

} else if ( state === STATE.PAN ) {

if ( scope.noPan === true ) return;

panEnd.set( event.clientX, event.clientY );
			panDelta.subVectors( panEnd, panStart );
			
			scope.pan( panDelta );

panStart.copy( panEnd );

}

// Greggman fix: https://github.com/greggman/three.js/commit/fde9f9917d6d8381f06bf22cdff766029d1761be
		scope.update();

}

function onMouseUp( /* event */ ) {

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

// Greggman fix: https://github.com/greggman/three.js/commit/fde9f9917d6d8381f06bf22cdff766029d1761be
		scope.domElement.removeEventListener( 'mousemove', onMouseMove, false );
		scope.domElement.removeEventListener( 'mouseup', onMouseUp, false );

state = STATE.NONE;

}

function onMouseWheel( event ) {

if ( scope.enabled === false || scope.noZoom === true ) return;

var delta = 0;

if ( event.wheelDelta ) { // WebKit / Opera / Explorer 9

delta = event.wheelDelta;

} else if ( event.detail ) { // Firefox

delta = - event.detail;

}

if ( delta > 0 ) {

scope.dollyOut();

} else {

scope.dollyIn();

}

function onKeyDown( event ) {

if ( scope.enabled === false ) { return; }
		if ( scope.noKeys === true ) { return; }
		if ( scope.noPan === true ) { return; }

// pan a pixel - I guess for precise positioning?
		// Greggman fix: https://github.com/greggman/three.js/commit/fde9f9917d6d8381f06bf22cdff766029d1761be
		var needUpdate = false;
		
		switch ( event.keyCode ) {

case scope.keys.UP:
				scope.pan( new THREE.Vector2( 0, scope.keyPanSpeed ) );
				needUpdate = true;
				break;
			case scope.keys.BOTTOM:
				scope.pan( new THREE.Vector2( 0, -scope.keyPanSpeed ) );
				needUpdate = true;
				break;
			case scope.keys.LEFT:
				scope.pan( new THREE.Vector2( scope.keyPanSpeed, 0 ) );
				needUpdate = true;
				break;
			case scope.keys.RIGHT:
				scope.pan( new THREE.Vector2( -scope.keyPanSpeed, 0 ) );
				needUpdate = true;
				break;
		}

// Greggman fix: https://github.com/greggman/three.js/commit/fde9f9917d6d8381f06bf22cdff766029d1761be
		if ( needUpdate ) {

scope.update();

}

}
	
	function touchstart( event ) {

if ( scope.enabled === false ) { return; }

switch ( event.touches.length ) {

case 1:	// one-fingered touch: rotate
				if ( scope.noRotate === true ) { return; }

state = STATE.TOUCH_ROTATE;

rotateStart.set( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );
				break;

case 2:	// two-fingered touch: dolly
				if ( scope.noZoom === true ) { return; }

state = STATE.TOUCH_DOLLY;

var dx = event.touches[ 0 ].pageX - event.touches[ 1 ].pageX;
				var dy = event.touches[ 0 ].pageY - event.touches[ 1 ].pageY;
				var distance = Math.sqrt( dx * dx + dy * dy );
				dollyStart.set( 0, distance );
				break;

case 3: // three-fingered touch: pan
				if ( scope.noPan === true ) { return; }

state = STATE.TOUCH_PAN;

panStart.set( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );
				break;

default:
				state = STATE.NONE;

}
	}

function touchmove( event ) {

if ( scope.enabled === false ) { return; }

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

var element = scope.domElement === document ? scope.domElement.body : scope.domElement;

switch ( event.touches.length ) {

case 1: // one-fingered touch: rotate
				if ( scope.noRotate === true ) { return; }
				if ( state !== STATE.TOUCH_ROTATE ) { return; }

rotateEnd.set( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );
				rotateDelta.subVectors( rotateEnd, rotateStart );

// rotating across whole screen goes 360 degrees around
				scope.rotateLeft( 2 * Math.PI * rotateDelta.x / element.clientWidth * scope.rotateSpeed );
				// rotating up and down along whole screen attempts to go 360, but limited to 180
				scope.rotateUp( 2 * Math.PI * rotateDelta.y / element.clientHeight * scope.rotateSpeed );

rotateStart.copy( rotateEnd );
				break;

case 2: // two-fingered touch: dolly
				if ( scope.noZoom === true ) { return; }
				if ( state !== STATE.TOUCH_DOLLY ) { return; }

var dx = event.touches[ 0 ].pageX - event.touches[ 1 ].pageX;
				var dy = event.touches[ 0 ].pageY - event.touches[ 1 ].pageY;
				var distance = Math.sqrt( dx * dx + dy * dy );

dollyEnd.set( 0, distance );
				dollyDelta.subVectors( dollyEnd, dollyStart );

if ( dollyDelta.y > 0 ) {

scope.dollyOut();

} else {

scope.dollyIn();

}

dollyStart.copy( dollyEnd );
				break;

case 3: // three-fingered touch: pan
				if ( scope.noPan === true ) { return; }
				if ( state !== STATE.TOUCH_PAN ) { return; }

panEnd.set( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );
				panDelta.subVectors( panEnd, panStart );
				
				scope.pan( panDelta );

panStart.copy( panEnd );
				break;

default:
				state = STATE.NONE;

}

function touchend( /* event */ ) {

if ( scope.enabled === false ) { return; }

state = STATE.NONE;
	}

this.domElement.addEventListener( 'contextmenu', function ( event ) { event.preventDefault(); }, false );
	this.domElement.addEventListener( 'mousedown', onMouseDown, false );
	this.domElement.addEventListener( 'mousewheel', onMouseWheel, false );
	this.domElement.addEventListener( 'DOMMouseScroll', onMouseWheel, false ); // firefox

this.domElement.addEventListener( 'keydown', onKeyDown, false );

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

};

THREE.OrbitControls.prototype = Object.create( THREE.EventDispatcher.prototype );
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