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HTML

              
                <!DOCTYPE html>
<html>
<head>
  <script src='https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.0/jquery.min.js'></script>
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <script src="https://brechtvdv.github.io/demo-data/n3-browser.js"></script>
  <script src="https://brechtvdv.github.io/demo-data/metricsgraphics.min.js"></script>
  <link href='https://brechtvdv.github.io/demo-data/metricsgraphics.css' rel='stylesheet' type='text/css'>
  <style>
  .flex-container-row {
    display: flex;
    flex-flow: wrap row;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    height:auto;
    margin-bottom: 10px;

  }
  .flex-container-column {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;

  }
  .flex-item {
    display: flex;
    margin: 10px 10px;
  }
  .chart {
    margin: auto;
  }
  #orange_light, #red_light, #green_light {
    margin-left: 5%; 
    height: auto; 
    width: 10%; 
    min-width: 75px;
    display: none;
  }
  #ligth_info {
    font-size: 70px;
  }
  }
</style>
</head>
<body>
  <div class="flex-container-column">
    <div class="flex-container-row">
      <div class="vertrek flex-item">
        <p>Departure:&nbsp;</p>
        <select id="vertreklaan">
        </select>
      </div>

      <div class="aankomst flex-item">
        <p>Arrival:&nbsp;</p>
        <select id="aankomstlaan">
        </select>
      </div>
    </div>
    <div class="flex-container-row">
      <img class="flex-item" id="orange_light" src="https://brechtvdv.github.io/demo-data/orange.jpg"/>
      <img class="flex-item" id="red_light" src="https://brechtvdv.github.io/demo-data/red.jpg"/>
      <img class="flex-item" id="green_light" src="https://brechtvdv.github.io/demo-data/green.jpg"/>
      <h3 class="flex-item" id="light_info"/>
    </div>

    <div class="chart" id="chart">
    </div>
  </div>

</body>
</html>
              
            
!

CSS

              
                
              
            
!

JS

              
                // Make sure Codepen doesn't stop refreshing the data
window.CP.PenTimer.MAX_TIME_IN_LOOP_WO_EXIT = 6000;

const { DataFactory } = N3;
const { namedNode, literal, defaultGraph, quad } = DataFactory;

//let DATASET_URL = 'http://localhost:8081/rawdata/latest';
let DATASET_URL = 'https://lodi.ilabt.imec.be/observer/rawdata/latest';

let sg = 'https://opentrafficlights.org/id/signalgroup/K648/1';
let SPEED = 100;
let first = true;
let signalgroups = [];
let prevGatGreen = [];
let lastGat, iLastGat, nextLastGat;
let AMOUNT_OF_FRAGMENTS = 15;

let WIDTH, HEIGHT;
if (window.innerWidth > 600) WIDTH = 600;
else WIDTH = 2*window.innerWidth;

if (window.innerHeight > 240) HEIGHT = 240;
else HEIGHT = window.innerHeight;

document.getElementById('chart').style.width = WIDTH;

let vertreklanen = {};

let data = {};

function updateDataGraphic() {
	if (data[sg] && data[sg].length > 0) {
		MG.data_graphic({
		    title: "Waiting time for green light",
		    description: "Amount of seconds to wait before the traffic light shows green.",
        	chart_type: 'point',
          	//markers: [{'generatedAtTime': new Date("2019-01-28T17:09:00"), 'label': 'Nu'}],
            point_size: '1',
		    data: data[sg],
            top: 70,
            width: WIDTH,
            height: HEIGHT,
	        right: 40,
		    target: '.chart',
		    x_accessor: 'generatedAtTime',
		    y_accessor: 'timeTillGreen',
	     	mouseover: function(d, i) {
            let format = d3.timeFormat("%Hh %Mm %Ss");
            d3.select('.chart svg .mg-active-datapoint')
                .text(Math.round(d.data.timeTillGreen) + " seconds at " + format(d.data.generatedAtTime));
        	},
        	xax_format: function (d, i) {
        		let format = d3.timeFormat("%H:%M:%S");
                return format(d);
        	}
		});
	}
}

function setDataGraphicEmpty() {
	MG.data_graphic({
		 title: "Waiting time for green light",
    description: "Amount of seconds to wait before the traffic light shows green.",
        error: 'No data found.',
    	chart_type: 'missing-data',
    	top: 70,
        width: 600,
        height: 240,
        right: 40,
	    target: '.chart',
    	missing_text: 'No data found.'
    });
}

const sleep = (milliseconds) => {
  return new Promise(resolve => setTimeout(resolve, milliseconds))
}


start();

async function start() {
	let doc = await download(DATASET_URL)
	let store = await parseAndStoreQuads(doc);
	signalgroups = await getSignalgroups(store);
	initConfiguration(store);

	// Init
	signalgroups.forEach((sg) => {
		prevGatGreen[sg] = null;
		data[sg] = [];
	});

	while(true) {
		await calcHistoricData(store);
		showLatest(store);

		let count = 0;

		// HISTORY
		let prev = store.getQuads(null, namedNode('http://www.w3.org/ns/hydra/core#previous'), null)[0];
		while (prev && count < AMOUNT_OF_FRAGMENTS) {
			count++;

			doc = await download(prev.object.value);
			store = await parseAndStoreQuads(doc);

			await calcHistoricData(store);

			prev = store.getQuads(null, namedNode('http://www.w3.org/ns/hydra/core#previous'), null)[0];
		}

		updateDataGraphic();

		doc = await download(DATASET_URL)
		store = await parseAndStoreQuads(doc);
		
		signalgroups.forEach((sg) => {
			prevGatGreen[sg] = null;
			data[sg] = [];
		});

		await sleep(SPEED)
	}
}

async function calcHistoricData(_store) {
	// Loop over observations order descending
	let observations = _store.getQuads(null, namedNode('http://www.w3.org/ns/prov#generatedAtTime'), null);
	observations.sort(function(a, b) {
		a = new Date(a.object.value).getTime();
		b = new Date(b.object.value).getTime();

		return a>b ? -1 : a<b ? 1 : 0;
	}).forEach((observation) => {
		let generatedAtTime = new Date(observation.object.value);

		if (!lastGat) lastGat = generatedAtTime;

		// Loop over all signalstates in the observation
		_store.getQuads(null, namedNode('https://w3id.org/opentrafficlights#signalState'), null, observation.subject).forEach((signalstateQuad) => {
			let signalgroup = signalstateQuad.subject.value;
			let signalphase = _store.getQuads(signalstateQuad.object, namedNode('https://w3id.org/opentrafficlights#signalPhase'), null, observation.subject)[0];
			let timeTillGreen;
			// When green
			if (signalphase.object.value === 'https://w3id.org/opentrafficlights/thesauri/signalphase/6' || signalphase.object.value === 'https://w3id.org/opentrafficlights/thesauri/signalphase/5') {
				prevGatGreen[signalgroup] = generatedAtTime;
				timeTillGreen = 0;
			}

			if (prevGatGreen[signalgroup] != null){
				timeTillGreen = (prevGatGreen[signalgroup].getTime() - generatedAtTime.getTime())/1000;

				// There's probably a data gap when this is very big
				if (timeTillGreen < 100) {
					if (!data[signalgroup]) data[signalgroup] = [];

					data[signalgroup].unshift({
						'generatedAtTime': new Date(generatedAtTime),
						'timeTillGreen': timeTillGreen
					})
				}
			}
		});
	});
}

async function getSignalgroups(_store) {
	let signalgroups = [];
	await _store.getQuads(null, namedNode('http://www.w3.org/2000/01/rdf-schema#type'), namedNode('https://w3id.org/opentrafficlights#Signalgroup')).forEach( (quad) => {
		signalgroups.push(quad.subject.value);
	});
	return signalgroups;
}

function download(_url) {
  return new Promise(resolve => {
    fetch(_url)
	  .then(function(response) {
	  	return response.text();
	  })
	  .then(function(text) {
	  	resolve(text);
	  });
  });
}	

function parseAndStoreQuads(_doc) {
	return new Promise(resolve => {
		const parser = new N3.Parser();
		const store = N3.Store();
		parser.parse(_doc, (error, quad, prefixes) => {
		    if (quad)
				store.addQuad(quad);
			else
				return resolve(store);
		});
	})
}

function initConfiguration(_store) {
	// Set departure lanes
	let options = '';
	let processedDepartureLanes = [];
	_store.getQuads(null, namedNode('https://w3id.org/opentrafficlights#departureLane'), null).forEach((quad) => {
			_store.getQuads(quad.object, namedNode('http://purl.org/dc/terms/description'), null).forEach( (quad) => {
		if (!processedDepartureLanes.includes(quad.object.value)){
							processedDepartureLanes.push(quad.object.value);

					options +=
					'<option value="' +
					quad.subject.value +
					'">' +
					quad.object.value +
					"</option>";
		}

				// Load arrival lanes
				_store.getQuads(null, namedNode('https://w3id.org/opentrafficlights#departureLane'), quad.subject).forEach((connectie) => {
					let signalgroup = _store.getQuads(connectie.subject, namedNode('https://w3id.org/opentrafficlights#signalGroup'), null)[0].object.value;
					_store.getQuads(connectie.subject, namedNode('https://w3id.org/opentrafficlights#arrivalLane'), null).forEach( (arrivalLane) => {
						_store.getQuads(arrivalLane.object, namedNode('http://purl.org/dc/terms/description'), null).forEach( (descr) => {
							if(!vertreklanen[quad.subject.value]) vertreklanen[quad.subject.value] = [];
							vertreklanen[quad.subject.value][arrivalLane.object.value] = {
								'@id': arrivalLane.object.value,
								'http://purl.org/dc/terms/description': descr.object.value,
								'https://w3id.org/opentrafficlights#signalGroup': signalgroup
							};
						});
					});
				});
			});
	});
	document.getElementById("vertreklaan").innerHTML = options;

	// Load arrival lanes dropdown list
	changeAankomstlanen();
}

$("#vertreklaan").on("change", function() {
	changeAankomstlanen();

	// Set active signalgroup for visualization
	checkActiveSignalgroup();
});

$("#aankomstlaan").on("change", function() {
	checkActiveSignalgroup();
});

function changeAankomstlanen() {
	let aankomstlanen = [];
	const vertreklaan = document.getElementById("vertreklaan").value;
	let options = '';
	for (let aankomstlaan in vertreklanen[vertreklaan]) {
		if (!aankomstlanen.includes(vertreklanen[vertreklaan][aankomstlaan]['http://purl.org/dc/terms/description'])) {
			options +=
			'<option value="' +
			vertreklanen[vertreklaan][aankomstlaan]['@id'] +
			'">' +
			vertreklanen[vertreklaan][aankomstlaan]['http://purl.org/dc/terms/description'] +
			"</option>";
			aankomstlanen.push(vertreklanen[vertreklaan][aankomstlaan]['http://purl.org/dc/terms/description']);
		}
	}
		
	document.getElementById("aankomstlaan").innerHTML = options;
}

function checkActiveSignalgroup() {
	const vertreklaan = document.getElementById("vertreklaan").value;
	const aankomstlaan = document.getElementById("aankomstlaan").value;
	if (vertreklanen[vertreklaan][aankomstlaan]['https://w3id.org/opentrafficlights#signalGroup']) {
		sg = vertreklanen[vertreklaan][aankomstlaan]['https://w3id.org/opentrafficlights#signalGroup'];
		updateDataGraphic();
	} else {
		setDataGraphicEmpty()
	}
}

async function showLatest(_store) {
	// Loop over observations order descending
	let observations = _store.getQuads(null, namedNode('http://www.w3.org/ns/prov#generatedAtTime'), null);
	let latest = observations.sort(function(a, b) {
		a = new Date(a.object.value).getTime();
		b = new Date(b.object.value).getTime();

		return a>b ? -1 : a<b ? 1 : 0;
	})[0];

	let generatedAtTime = latest.object.value;

	// Get state of active signalgroup
	let signalstate = _store.getQuads(namedNode(sg), namedNode('https://w3id.org/opentrafficlights#signalState'), null, latest.subject)[0];
	if (signalstate) {
		let minEndTime = _store.getQuads(signalstate.object, namedNode('https://w3id.org/opentrafficlights#minEndTime'), null, latest.subject)[0];
		let maxEndTime = _store.getQuads(signalstate.object, namedNode('https://w3id.org/opentrafficlights#maxEndTime'), null, latest.subject)[0];
		let signalPhase = _store.getQuads(signalstate.object, namedNode('https://w3id.org/opentrafficlights#signalPhase'), null, latest.subject)[0];
		
		let count = Math.round((new Date(minEndTime.object.value).getTime() - new Date(generatedAtTime).getTime())/1000);
		if (minEndTime.object.value === maxEndTime.object.value) {
			showCounterLabel(count, signalPhase.object.value);	
		} else {
			showCounterLabel("> " + count, signalPhase.object.value);
		}
	}
}

function showCounterLabel(counter_, label_) {
      const info = '<h3>&nbsp;&nbsp;' + counter_ + " seconds</h3>";

      // const info = '<h3 style="float: left">' + label_ + '</h3><h1 style="font-size: 100px;">' + counter_ + '</h1></div>';
      if (label_ === 'https://w3id.org/opentrafficlights/thesauri/signalphase/2' || label_ === 'https://w3id.org/opentrafficlights/thesauri/signalphase/3') {
        // Red
        document.getElementById("orange_light").style.display = "none";
        document.getElementById("green_light").style.display = "none";
        document.getElementById("red_light").style.display = "flex";
      }
      else if (label_ === 'https://w3id.org/opentrafficlights/thesauri/signalphase/5' || label_ === 'https://w3id.org/opentrafficlights/thesauri/signalphase/6') {
        // green
        document.getElementById("red_light").style.display = "none";
        document.getElementById("orange_light").style.display = "none";
        document.getElementById("green_light").style.display = "flex";
      }
      else {
        // orange
        document.getElementById("red_light").style.display = "none";
        document.getElementById("green_light").style.display = "none";
        document.getElementById("orange_light").style.display = "flex";
      }
      
      document.getElementById('light_info').innerHTML = info;
    }
              
            
!
999px

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