File: GIScene\Control\Compass.js

/**
 * The Compass Control provides a graphical information on the current camera orientation, like a compass.
 * 
 * @namespace GIScene
 * @class Control.Compass
 * @constructor
 * @extends GIScene.Control
 * @param {THREE.Camera} camera 
 */

GIScene.Control.Compass = function(camera, config) {
	
	//make this a control
	GIScene.Control.call(this);
	
	var defaults = {
		//positioning in px from canvas border
	};
	
	/**
	 * The config which is used to initialize the Compass-Control. Merged from defaults and passed config Object.
	 * 
	 * @property config
	 * @type Object
	 */
	this.config = GIScene.Utils.mergeObjects(defaults, config || {});
	
	
	this.camera = camera;
	
	var compassDegrees = 0;
	
	var windroseDataURL = "data:image/png;base64,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";
	
	
	var spriteTexture = new THREE.Texture(null);
	var windroseImg = new Image();
		windroseImg.onload = function() {
			spriteTexture.image = windroseImg;
			spriteTexture.needsUpdate = true;
		};
		windroseImg.src = windroseDataURL;
	
	// var spriteTexture = THREE.ImageUtils.loadTexture( GIScene.LIBRARYPATH + GIScene.RESOURCESPATH.replace(/([^\/])$/, "$1/") +"resources/images/windrose3.png" );

	var spriteMaterial = new THREE.SpriteMaterial({ map : spriteTexture, /*useScreenCoordinates:true,*/ opacity:1  });
	this.sprite = new THREE.Sprite(spriteMaterial);
	this.sprite.scale.set( 100, 100, 1 );
	// this.sprite.position.set(60,60,0);
	
	
	this.update = function() {
		//calc angle
		
		var ctp = this.camera.localToWorld(this.camera.target.position.clone());
		var cp = this.camera.position;
		var dir = ctp.sub(cp);
		var up = new THREE.Vector3(0,1,0);
		var north = new THREE.Vector3(0,0,-1);
		var dirOnPlane = dir.projectOnPlane(up);
		var isEastside = (dirOnPlane.clone().cross(up).angleTo(north) > Math.PI/2) ? true : false;
		var angleToNorth = dirOnPlane.angleTo(north);
		var compassAngle = (isEastside) ? angleToNorth : Math.PI*2 - angleToNorth;
		compassDegrees = THREE.Math.radToDeg(compassAngle);
		this.sprite.material.rotation = compassAngle;
		
	}.bind(this);
	
	/**
	 * Get Compass direction in degrees
	 * 
	 * @method getCompassDegrees 
	 * @return {Number} heading of compass in degrees
	 */
	
	this.getCompassDegrees = function() {
		return compassDegrees;
	};
	
	var onResize = function() {
		this.sprite.position.set((-this.scene.canvas.width/2)+60,(this.scene.canvas.height/2)-60,0);
	}.bind(this);
	
	
	/**
	 * Activates this Control
	 * 
	 * @method activate
	 *  
	 */
	this.activate = function(){
		if(this.isActive) return;
		
		this.scene.spriteRoot.add(this.sprite);
		this.sprite.position.set((-this.scene.canvas.width/2)+60,(this.scene.canvas.height/2)-60,0);
		this.update();
		
		//eventListeners
		//hang in render loop
		this.scene.addEventListener("cameraChange", this.update);
		window.addEventListener('resize', onResize, false);
		
		//call super class method
		GIScene.Control.prototype.activate.call(this);
	};
	
	/**
	 * Deactivates this Control
	 * 
	 * @method deactivate
	 *  
	 */
	this.deactivate = function(){
		if(!this.isActive) return;
		
		this.scene.spriteRoot.remove(this.sprite);
		//remove from render loop
		this.scene.removeEventListener("cameraChange", this.update);
		window.removeEventListener('resize', onResize, false);
		
		//call super class method
		GIScene.Control.prototype.deactivate.call(this);
	};
	

};
//Inherit from GIScene.Control
GIScene.Control.Compass.prototype = Object.create( GIScene.Control.prototype );
APIs

File: GIScene\Control\Compass.js
