Code demonstrated during the Titanium Livestream about Geolocation and ti.map

geolocation_demo.js

const imgf = require('ti.imagefactory');
var map = require('ti.map');
var carImages = [];

$.index.open();

function rotateImage(blob, degrees, annotation) {

	if (_.findIndex(carImages, {degrees: degrees}) == -1) {
		generateCarFile(blob, degrees);
	}

	const newAnnotation = require('ti.map').createAnnotation({
		latitude: annotation.latitude,
		longitude: annotation.longitude,
		image: carImages[_.findIndex(carImages, {degrees: degrees})].blob
	});

	$.map.addAnnotations([newAnnotation]);
	setTimeout(() => {
		$.map.removeAnnotation(annotation);
	},50);

	return newAnnotation;
}

function generateCarFile(blob, degrees) {
	const newFile = Ti.Filesystem.getFile(Ti.Filesystem.applicationDataDirectory, 'car' + degrees + '.png');

	if (!newFile.exists()) {
		newFile.write(imgf.imageWithRotation(blob, { degrees: degrees}));
	}
	carImages.push({degrees: degrees, blob: newFile.read()});
}

/*
function animateCar(blob, fromDegrees, toDegrees, annotation) {
	if (fromDegrees > toDegrees) return;
	annotation = rotateImage(blob, fromDegrees, annotation);
	setTimeout(() => {
		animateCar(blob, fromDegrees+10, toDegrees, annotation);
	}, 200);

	for (let i = fromDegrees; i < toDegrees; i+=10) {
		generateCarFile(blob, i);
	}
}*/


const image = Ti.UI.createImageView({image: '/images/car.png'}).toImage();

let annotation = require('ti.map').createAnnotation({
	latitude: 52.39,
	longitude: 4.89,
	image: '/images/car.png'
});


$.map.addAnnotation(annotation);

var lastHeading = 0;
function locationCallback(e) {
	if (!e || !e.coords) return;
	
	if (e.coords.heading > -1 && _.findIndex(carImages, {degrees: Math.round(e.coords.heading)}) == -1) {
		generateCarFile(image, Math.round(e.coords.heading));
		lastHeading = Math.round(e.coords.heading);
	}

	$.map.removeAnnotation(annotation);
	annotation = require('ti.map').createAnnotation({
		latitude: e.coords.latitude,
		longitude: e.coords.longitude,
		image: carImages[_.findIndex(carImages, {degrees: lastHeading || 0})].blob
	});
	$.map.addAnnotation(annotation);

	$.map.setLocation({
		latitude: e.coords.latitude,
		longitude: e.coords.longitude,
		animate: true
	});
}

function handleRegionchange(e) {
	console.log(e);
	$.map.addAnnotation(require('ti.map').createAnnotation({
		latitude: e.latitude + (e.latitudeDelta / 2),
		longitude: e.longitude + (e.longitudeDelta / 2 )
	}));
}

//Ti.Geolocation.addEventListener('location', locationCallback);