whisper.cat stuff

weboasis/arcade/chess/js/lib/OrbitAndPanControls.js

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+/**
+ * @author qiao / https://github.com/qiao
+ * @author mrdoob / http://mrdoob.com
+ * @author alteredq / http://alteredqualia.com/
+ * @author WestLangley / https://github.com/WestLangley
+ * @author erich666 / http://erichaines.com
+ *
+ * Not quite correct: sort of assumes a 45 degree field of view.
+ * Currently uses distance to target for offsetting
+ */
+
+THREE.OrbitAndPanControls = function ( object, domElement ) {
+
+	this.addEventListener = THREE.EventDispatcher.prototype.addEventListener;
+	this.hasEventListener = THREE.EventDispatcher.prototype.hasEventListener;
+	this.removeEventListener = THREE.EventDispatcher.prototype.removeEventListener;
+	this.dispatchEvent = THREE.EventDispatcher.prototype.dispatchEvent;
+
+	this.enabled = true;
+
+	this.object = object;
+	this.domElement = ( domElement !== undefined ) ? domElement : document;
+
+	// API
+
+	this.target = new THREE.Vector3();
+
+	this.userZoom = true;
+	this.userZoomSpeed = 1.0;
+
+	this.userRotate = true;
+	this.userRotateSpeed = 1.0;
+
+	this.autoRotate = false;
+	this.autoRotateSpeed = 2.0; // 30 seconds per round when fps is 60
+
+	this.minPolarAngle = 0; // radians
+	this.maxPolarAngle = Math.PI; // radians
+
+	this.minDistance = 0;
+	this.maxDistance = Infinity;
+
+	// 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;
+
+	};
+
+	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 );
+
+	};
+
+	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 );
+	};
+
+	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.userZoomSpeed );
+
+	}
+
+	function onMouseDown( event ) {
+
+		if ( scope.enabled === false ) { return; }
+
+		if ( !scope.userRotate ) { return; }
+
+		event.preventDefault();
+
+		if ( event.button === 0 ) {
+
+			state = STATE.ROTATE;
+
+			rotateStart.set( event.clientX, event.clientY );
+
+		} /*else if ( event.button === 2 ) {
+
+			state = STATE.PAN;
+
+			panStart.set( event.clientX, event.clientY );
+
+		}*/ else if ( event.button === 2 ) {
+
+			state = STATE.DOLLY;
+
+			dollyStart.set( event.clientX, event.clientY );
+
+		}
+
+		document.addEventListener( 'mousemove', onMouseMove, false );
+		document.addEventListener( 'mouseup', onMouseUp, false );
+
+	}
+
+	function onMouseMove( event ) {
+
+		if ( scope.enabled === false ) { return; }
+
+		event.preventDefault();
+
+		if ( state === STATE.ROTATE ) {
+
+			rotateEnd.set( event.clientX, event.clientY );
+			rotateDelta.subVectors( rotateEnd, rotateStart );
+
+			scope.rotateLeft( 2 * Math.PI * rotateDelta.x / scope.domElement.width * scope.userRotateSpeed );
+			scope.rotateUp( Math.PI * rotateDelta.y / scope.domElement.height * scope.userRotateSpeed );
+
+			rotateStart.copy( rotateEnd );
+
+		} else if ( state === STATE.PAN ) {
+
+			panEnd.set( event.clientX, event.clientY );
+			panDelta.subVectors( panEnd, panStart );
+
+			var position = scope.object.position;
+			var offset = position.clone().sub( scope.target );
+			var targetDistance = offset.length();
+			if ( scope.object.fov !== undefined )
+			{
+				// 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 * panDelta.x * targetDistance / scope.domElement.height );
+			scope.panUp( 2 * panDelta.y * targetDistance / scope.domElement.height );
+
+			panStart.copy( panEnd );
+
+		} else if ( state === STATE.DOLLY ) {
+
+			dollyEnd.set( event.clientX, event.clientY );
+			dollyDelta.subVectors( dollyEnd, dollyStart );
+
+			if ( dollyDelta.y > 0 ) {
+
+				scope.dollyIn();
+
+			} else {
+
+				scope.dollyOut();
+
+			}
+
+			dollyStart.copy( dollyEnd );
+
+		}
+
+	}
+
+	function onMouseUp( /* event */ ) {
+
+		if ( scope.enabled === false ) { return; }
+
+		if ( ! scope.userRotate ) { return; }
+
+		document.removeEventListener( 'mousemove', onMouseMove, false );
+		document.removeEventListener( 'mouseup', onMouseUp, false );
+
+		state = STATE.NONE;
+	}
+
+	function onMouseWheel( event ) {
+
+		if ( scope.enabled === false ) { return; }
+
+		if ( ! scope.userZoom ) { 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 touchstart( event ) {
+
+		if ( scope.enabled === false ) { return; }
+
+		/* TODO, innards of mouse begin here
+		switch ( event.touches.length ) {
+
+			case 1:
+				state = STATE.TOUCH_ROTATE;
+
+				rotateStart.set( event.clientX, event.clientY );
+				_state = STATE.TOUCH_ROTATE;
+				_rotateStart = _rotateEnd = _this.getMouseProjectionOnBall( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );
+				break;
+
+			case 2:
+				state = STATE.TOUCH_DOLLY;
+
+				dollyStart.set( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );
+				
+				// classier would be to take both points for a multitouch stretch thing:
+				//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.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();
+
+		/* TODO, innards of mouse move here
+		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 ( scope.enabled === false ) { return; }
+
+		/* from trackball. I don't think we need anything.
+		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', onMouseDown, false );
+	this.domElement.addEventListener( 'mousewheel', onMouseWheel, false );
+	this.domElement.addEventListener( 'DOMMouseScroll', onMouseWheel, false ); // firefox
+
+	this.domElement.addEventListener( 'touchstart', touchstart, false );
+	this.domElement.addEventListener( 'touchend', touchend, false );
+	this.domElement.addEventListener( 'touchmove', touchmove, false );
+
+};