openct-tasks/_common/modules/ext/zen3d/controls/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
 * @author shawn0326 / http://halflab.me
 */

// This set of controls performs orbiting, dollying (zooming), and panning.
// Unlike TrackballControls, it maintains the "up" direction object.up (+Y by default).
//
//    Orbit - left mouse / touch: one-finger move
//    Dolly - middle mouse, or mousewheel / touch: two-finger spread or squish
//    Pan - right mouse, or arrow keys / touch: two-finger move

zen3d.OrbitControls = function(object, domElement, options) {

	var defaultOptions = {
		// How far you can dolly in and out
		minDistance: 0,
		maxDistance: Infinity
	}

	this.options = Object.assign({}, defaultOptions, options);
	this.object = object;

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

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

	// "target" sets the location of focus, where the object orbits around
	this.target = new zen3d.Vector3();

	// 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

	// How far you can orbit horizontally, upper and lower limits.
	// If set, must be a sub-interval of the interval [ - Math.PI, Math.PI ].
	this.minAzimuthAngle = -Infinity; // radians
	this.maxAzimuthAngle = Infinity; // radians

	// Set to true to enable damping (inertia)
	// If damping is enabled, you must call controls.update() in your animation loop
	this.enableDamping = true;
	this.dampingFactor = 0.25;

	// This option enables dollying in and out.
	// Set to false to disable dollying
	this.enableDollying = true;
	this.dollyingSpeed = 1.0;

	// Set to false to disable rotating
	this.enableRotate = true;
	this.rotateSpeed = 0.25;

	// Set to false to disable panning
	this.enablePan = true;
	this.panSpeed = 1.0;
	this.screenSpacePanning = false; // if true, pan in screen-space
	this.keyPanSpeed = 7.0;	// pixels moved per arrow key push

	// Set to true to automatically rotate around the target
	// If auto-rotate is enabled, you must call controls.update() in your animation loop
	this.autoRotate = false;
	this.autoRotateSpeed = 2.0; // 30 seconds per round when fps is 60

	// Set to false to disable use of the keys
	this.enableKeys = true;

	// The four arrow keys
	this.keys = { LEFT: 37, UP: 38, RIGHT: 39, BOTTOM: 40 };

	// Mouse buttons
	this.mouseButtons = { ORBIT: 0, DOLLY: 1, PAN: 2 };

	// for reset
	this.target0 = this.target.clone();
	this.position0 = this.object.position.clone();

	//
	// public methods
	//

	this.getPolarAngle = function () {
		return spherical.phi;
	};

	this.getAzimuthalAngle = function () {
		return spherical.theta;
	};

	// modydimk: add public method for earth3d
	this.setAzimuthalAngle = function (angle) {
		sphericalDelta.theta = angle;
		this.update();
	}

	this.saveState = function () {
		scope.target0.copy(scope.target);
		scope.position0.copy(scope.object.position);
	};

	this.reset = function () {
		scope.target.copy(scope.target0);
		scope.object.position.copy(scope.position0);

		// scope.update();

		state = STATE.NONE;
	};

	this.update = function() {
		var offset = new zen3d.Vector3();

		var lastPosition = new zen3d.Vector3();
		var lastQuaternion = new zen3d.Quaternion();

		return function update() {
			var position = scope.object.position;

			offset.copy(position).sub(scope.target);

			// TODO rotate offset to "y-axis-is-up" space

			// angle from z-axis around y-axis
			spherical.setFromVector3(offset);

			if (scope.autoRotate && state === STATE.NONE) {
				rotateLeft(getAutoRotationAngle());
			}

			spherical.theta += sphericalDelta.theta;
			spherical.phi += sphericalDelta.phi;

			// restrict theta to be between desired limits
			spherical.theta = Math.max(scope.minAzimuthAngle, Math.min(scope.maxAzimuthAngle, spherical.theta));

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

			spherical.makeSafe();


			if(targetSphericalRadius !== null) {
				spherical.radius = targetSphericalRadius;
				targetSphericalRadius = null;
			} else {
				spherical.radius *= scale;
			}
			

			// restrict radius to be between desired limits
			spherical.radius = Math.max(scope.options.minDistance, Math.min(scope.options.maxDistance, spherical.radius));
			callCallbacks(spherical);


			// move target to panned location
			scope.target.add(panOffset);

			offset.setFromSpherical(spherical);

			// TODO rotate offset back to "camera-up-vector-is-up" space

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

			scope.object.lookAt(scope.target, defaultUp);

			if (scope.enableDamping === true) {
				sphericalDelta.theta *= (1 - scope.dampingFactor);
				sphericalDelta.phi *= (1 - scope.dampingFactor);

				panOffset.multiplyScalar(1 - scope.dampingFactor);
			} else {
				sphericalDelta.set(0, 0, 0);

				panOffset.set(0, 0, 0);
			}

			scale = 1;

			// update condition is:
			// min(camera displacement, camera rotation in radians)^2 > EPS
			// using small-angle approximation cos(x/2) = 1 - x^2 / 8

			if (lastPosition.distanceToSquared(scope.object.position) > EPS ||
                8 * (1 - lastQuaternion.dot(scope.object.quaternion)) > EPS) {
				lastPosition.copy(scope.object.position);
				lastQuaternion.copy(scope.object.quaternion);

				return true;
			}

			return false;
		};
	}();

	this.dispose = function () {
		scope.domElement.removeEventListener('contextmenu', onContextMenu, false);
		scope.domElement.removeEventListener('mousedown', onMouseDown, false);
		scope.domElement.removeEventListener('wheel', onMouseWheel, false);

		scope.domElement.removeEventListener('touchstart', onTouchStart, false);
		scope.domElement.removeEventListener('touchend', onTouchEnd, false);
		scope.domElement.removeEventListener('touchmove', onTouchMove, false);

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

		window.removeEventListener('keydown', onKeyDown, false);
	};

	this.setRadius = function(r) {
		targetSphericalRadius = r;
	}

	//
	// internals
	//

	var scope = this;

	var STATE = { NONE: -1, ROTATE: 0, DOLLY: 1, PAN: 2, TOUCH_ROTATE: 3, TOUCH_DOLLY_PAN: 4 };

	var state = STATE.NONE;

	var EPS = 0.000001;

	var defaultUp = new zen3d.Vector3(0, 1, 0);

	// current position in spherical coordinates
	var spherical = new zen3d.Spherical();
	var sphericalDelta = new zen3d.Spherical();

	var scale = 1;
	var targetSphericalRadius = null;
	var panOffset = new zen3d.Vector3();

	var rotateStart = new zen3d.Vector2();
	var rotateEnd = new zen3d.Vector2();
	var rotateDelta = new zen3d.Vector2();

	var panStart = new zen3d.Vector2();
	var panEnd = new zen3d.Vector2();
	var panDelta = new zen3d.Vector2();

	var dollyStart = new zen3d.Vector2();
	var dollyEnd = new zen3d.Vector2();
	var dollyDelta = new zen3d.Vector2();


	var oldSpherical = spherical.clone();
	function callCallbacks() {
		var fl = false;
		if(oldSpherical.phi != spherical.phi || oldSpherical.theta != spherical.theta) {
			scope.options.onRotate && scope.options.onRotate(spherical);
			fl = true;
		}
		if(oldSpherical.radius != spherical.radius) {
			scope.options.onDistanceChange && scope.options.onDistanceChange(spherical);
			fl = true;
		}
		if(fl) {
			oldSpherical = spherical.clone();
		}
	}

	function getAutoRotationAngle() {
		return 2 * Math.PI / 60 / 60 * scope.autoRotateSpeed;
	}

	function getDollyingScale() {
		return Math.pow(0.95, scope.dollyingSpeed);
	}

	function rotateLeft(angle) {
		sphericalDelta.theta -= angle;
	}

	function rotateUp(angle) {
		sphericalDelta.phi -= angle;
	}

	var panLeft = function () {
		var v = new zen3d.Vector3();

		return function panLeft(distance, objectMatrix) {
			v.setFromMatrixColumn(objectMatrix, 0); // get X column of objectMatrix
			v.multiplyScalar(-distance);

			panOffset.add(v);
		};
	}();

	var panUp = function () {
		var v = new zen3d.Vector3();

		return function panUp(distance, objectMatrix) {
			if (scope.screenSpacePanning === true) {
				v.setFromMatrixColumn(objectMatrix, 1);
			} else {
				v.setFromMatrixColumn(objectMatrix, 0);
				v.crossVectors(defaultUp, v);
			}

			v.multiplyScalar(distance);

			panOffset.add(v);
		};
	}();

	// deltaX and deltaY are in pixels; right and down are positive
	var pan = function () {
		var offset = new zen3d.Vector3();

		var project = new zen3d.Matrix4();
		var projectInv = new zen3d.Matrix4();

		var p = new zen3d.Vector3();

		return function pan(deltaX, deltaY) {
			var element = scope.domElement === document ? scope.domElement.body : scope.domElement;

			var position = scope.object.position;
			offset.copy(position).sub(scope.target);
			var targetDistance = offset.getLength();

			project.copy(scope.object.projectionMatrix);
			projectInv.getInverse(project);

			var depth = p.set(0, 0, targetDistance).applyMatrix4(project).z;

			// full-screen to world distance
			var distance = p.set(0, -0.5, depth).applyMatrix4(projectInv).y;
			distance *= 2;

			// we use only clientHeight here so aspect ratio does not distort speed
			panLeft(deltaX * distance / element.clientHeight, scope.object.matrix);
			panUp(deltaY * distance / element.clientHeight, scope.object.matrix);
		};
	}();

	function dollyIn(dollyScale) {
		scale /= dollyScale;
	}

	function dollyOut(dollyScale) {
		scale *= dollyScale;
	}

	//
	// event callbacks - update the object state
	//

	function handleMouseDownRotate(event) {
		// console.log( 'handleMouseDownRotate' );

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

	function handleMouseDownDolly(event) {
		// console.log( 'handleMouseDownDolly' );

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

	function handleMouseDownPan(event) {
		// console.log( 'handleMouseDownPan' );

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

	function handleMouseMoveRotate(event) {
		// console.log( 'handleMouseMoveRotate' );

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

		rotateDelta.subVectors(rotateEnd, rotateStart).multiplyScalar(scope.rotateSpeed);

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

		// rotating across whole screen goes 360 degrees around
		rotateLeft(2 * Math.PI * rotateDelta.x / element.clientWidth);

		// rotating up and down along whole screen attempts to go 360, but limited to 180
		rotateUp(2 * Math.PI * rotateDelta.y / element.clientHeight);

		rotateStart.copy(rotateEnd);

		// scope.update();
	}

	function handleMouseMoveDolly(event) {
		// console.log( 'handleMouseMoveDolly' );

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

		dollyDelta.subVectors(dollyEnd, dollyStart);

		if (dollyDelta.y > 0) {
			dollyIn(getDollyingScale());
		} else if (dollyDelta.y < 0) {
			dollyOut(getDollyingScale());
		}

		dollyStart.copy(dollyEnd);

		// scope.update();
	}

	function handleMouseMovePan(event) {
		// console.log( 'handleMouseMovePan' );

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

		panDelta.subVectors(panEnd, panStart).multiplyScalar(scope.panSpeed);

		pan(panDelta.x, panDelta.y);

		panStart.copy(panEnd);

		// scope.update();
	}

	function handleMouseUp(event) {

		// console.log( 'handleMouseUp' );

	}

	function handleMouseWheel(event) {
		// console.log( 'handleMouseWheel' );

		if (event.deltaY < 0) {
			dollyOut(getDollyingScale());
		} else if (event.deltaY > 0) {
			dollyIn(getDollyingScale());
		}

		// scope.update();
	}

	function handleKeyDown(event) {
		// console.log( 'handleKeyDown' );

		switch (event.keyCode) {
		case scope.keys.UP:
			pan(0, scope.keyPanSpeed);
			// scope.update();
			break;

		case scope.keys.BOTTOM:
			pan(0, -scope.keyPanSpeed);
			// scope.update();
			break;

		case scope.keys.LEFT:
			pan(scope.keyPanSpeed, 0);
			// scope.update();
			break;

		case scope.keys.RIGHT:
			pan(-scope.keyPanSpeed, 0);
			// scope.update();
			break;
		}
	}

	function handleTouchStartRotate(event) {
		// console.log( 'handleTouchStartRotate' );

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

	function handleTouchStartDollyPan(event) {
		// console.log( 'handleTouchStartDollyPan' );

		if (scope.enableDollying) {
			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);
		}

		if (scope.enablePan) {
			var x = 0.5 * (event.touches[0].pageX + event.touches[1].pageX);
			var y = 0.5 * (event.touches[0].pageY + event.touches[1].pageY);

			panStart.set(x, y);
		}
	}

	function handleTouchMoveRotate(event) {
		// console.log( 'handleTouchMoveRotate' );

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

		rotateDelta.subVectors(rotateEnd, rotateStart).multiplyScalar(scope.rotateSpeed);

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

		// rotating across whole screen goes 360 degrees around
		rotateLeft(2 * Math.PI * rotateDelta.x / element.clientWidth);

		// rotating up and down along whole screen attempts to go 360, but limited to 180
		rotateUp(2 * Math.PI * rotateDelta.y / element.clientHeight);

		rotateStart.copy(rotateEnd);

		// scope.update();
	}

	function handleTouchMoveDollyPan(event) {
		// console.log( 'handleTouchMoveDollyPan' );

		if (scope.enableDollying) {
			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.set(0, Math.pow(dollyEnd.y / dollyStart.y, scope.dollyingSpeed));

			dollyIn(dollyDelta.y);

			dollyStart.copy(dollyEnd);
		}

		if (scope.enablePan) {
			var x = 0.5 * (event.touches[0].pageX + event.touches[1].pageX);
			var y = 0.5 * (event.touches[0].pageY + event.touches[1].pageY);

			panEnd.set(x, y);

			panDelta.subVectors(panEnd, panStart).multiplyScalar(scope.panSpeed);

			pan(panDelta.x, panDelta.y);

			panStart.copy(panEnd);
		}

		// scope.update();
	}

	function handleTouchEnd(event) {

		// console.log( 'handleTouchEnd' );

	}

	//
	// event handlers - FSM: listen for events and reset state
	//

	function onMouseDown(event) {
		if (scope.enabled === false) return;

		event.preventDefault();

		switch (event.button) {
		case scope.mouseButtons.ORBIT:

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

			handleMouseDownRotate(event);

			state = STATE.ROTATE;

			break;

		case scope.mouseButtons.DOLLY:

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

			handleMouseDownDolly(event);

			state = STATE.DOLLY;

			break;

		case scope.mouseButtons.PAN:

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

			handleMouseDownPan(event);

			state = STATE.PAN;

			break;
		}

		if (state !== STATE.NONE) {
			document.addEventListener('mousemove', onMouseMove, false);
			document.addEventListener('mouseup', onMouseUp, false);
		}
	}

	function onMouseMove(event) {
		if (scope.enabled === false) return;

		event.preventDefault();

		switch (state) {
		case STATE.ROTATE:

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

			handleMouseMoveRotate(event);

			break;

		case STATE.DOLLY:

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

			handleMouseMoveDolly(event);

			break;

		case STATE.PAN:

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

			handleMouseMovePan(event);

			break;
		}
	}

	function onMouseUp(event) {
		if (scope.enabled === false) return;

		handleMouseUp(event);

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

		state = STATE.NONE;
	}

	function onMouseWheel(event) {
		if (scope.enabled === false || scope.enableDollying === false || (state !== STATE.NONE && state !== STATE.ROTATE)) return;

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

		handleMouseWheel(event);
	}

	function onKeyDown(event) {
		if (scope.enabled === false || scope.enableKeys === false || scope.enablePan === false) return;

		handleKeyDown(event);
	}

	function onTouchStart(event) {
		if (scope.enabled === false) return;

		event.preventDefault();

		switch (event.touches.length) {
		case 1:	// one-fingered touch: rotate

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

			handleTouchStartRotate(event);

			state = STATE.TOUCH_ROTATE;

			break;

		case 2:	// two-fingered touch: dolly-pan

			if (scope.enableDollying === false && scope.enablePan === false) return;

			handleTouchStartDollyPan(event);

			state = STATE.TOUCH_DOLLY_PAN;

			break;

		default:

			state = STATE.NONE;
		}
	}

	function onTouchMove(event) {
		if (scope.enabled === false) return;

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

		switch (event.touches.length) {
		case 1: // one-fingered touch: rotate

			if (scope.enableRotate === false) return;
			if (state !== STATE.TOUCH_ROTATE) return; // is this needed?

			handleTouchMoveRotate(event);

			break;

		case 2: // two-fingered touch: dolly-pan

			if (scope.enableDollying === false && scope.enablePan === false) return;
			if (state !== STATE.TOUCH_DOLLY_PAN) return; // is this needed?

			handleTouchMoveDollyPan(event);

			break;

		default:

			state = STATE.NONE;
		}
	}

	function onTouchEnd(event) {
		if (scope.enabled === false) return;

		handleTouchEnd(event);

		state = STATE.NONE;
	}

	function onContextMenu(event) {
		if (scope.enabled === false) return;

		event.preventDefault();
	}

	//

	scope.domElement.addEventListener('contextmenu', onContextMenu, false);

	scope.domElement.addEventListener('mousedown', onMouseDown, false);
	scope.domElement.addEventListener('wheel', onMouseWheel, false);

	scope.domElement.addEventListener('touchstart', onTouchStart, false);
	scope.domElement.addEventListener('touchend', onTouchEnd, false);
	scope.domElement.addEventListener('touchmove', onTouchMove, false);

	window.addEventListener('keydown', onKeyDown, false);

	// force an update at start

	this.update();
};