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tfl requests for arrivals and data extraction from this data #7

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merged 1 commit into from
Oct 21, 2015
Merged

tfl requests for arrivals and data extraction from this data #7

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31 changes: 31 additions & 0 deletions index.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>api test</title>
</head>
<body>
<div class="wrapper"></div>
<script type="text/javascript" src = "./main.js"></script>
</body>
</html>

<!DOCTYPE html>
<meta charset="utf-8">
<body>
<style>

path {
fill: none;
stroke: #000;
stroke-width: 3px;
}

circle {
fill: steelblue;
stroke: #fff;
stroke-width: 3px;
}

</style>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
155 changes: 155 additions & 0 deletions main.js
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var mainWrapper = document.querySelector('div.wrapper');
var req = new XMLHttpRequest();
req.open('GET', 'https://api.tfl.gov.uk/Line/Circle/arrivals?app_id=835f25cf&app_key=dc0f2d114ba4e4fa542473a670755267');
req.onreadystatechange = function() {
if (req.readyState === 4) {
if (req.status === 200) {
var data = JSON.parse(req.responseText);
mainWrapper.innerHTML = 'fetch!';
allStationArrivalInfo = data.map(function(stationArrivalInfo) {
return {
stationNumber: getStationNumber(stationArrivalInfo.stationName),
direction: getDirectionFrom(stationArrivalInfo.towards),
time: stationArrivalInfo.timeToStation
};
});
allStationArrivalInfo = removeUnfoundStations(allStationArrivalInfo);
clockwiseData = filterByDirection('clockwise', allStationArrivalInfo);
var numStations = stopOrder.length;
var points = dataToCoords(numStations, createArrivalOutputData(clockwiseData));
console.log(points);
draw(points);
} else {
console.log('error. state = ', req.status);
}
}
}
req.send();

function createArrivalOutputData(arrivalData) {
var out = stopOrder.map(function(stopName, stopIndex) {
return getShortestTimeForStationNumber(stopIndex, arrivalData) + 1;
});
return out;
}

function getShortestTimeForStationNumber(targetStationNumber, allStationArrivalInfo) {
var maxTime = 600;
var minTime = allStationArrivalInfo.reduce(function(minTime, stationArrivalInfo) {
if (stationArrivalInfo.stationNumber === targetStationNumber) {
var arrivalTime = stationArrivalInfo.time;
return minTime > arrivalTime ? arrivalTime : minTime;
} else {
return minTime;
}
}, maxTime);
return minTime/maxTime;
}

function removeUnfoundStations(allStationArrivalInfo) {
return allStationArrivalInfo.filter(function(stationArrivalInfo) {
return stationArrivalInfo.stationNumber !== -1
});
}

function dataToCoords(numberOfPoints, values) {
console.log(values);
return values.map(function(value, i) {
var angle = (i/numberOfPoints)*2*Math.PI;
var r = value;
return [(r*Math.cos(angle)+2)*100, (r*Math.sin(angle)+2)*100];
});
}

var stopOrder = [
'Edgware',
'Baker',
'Great',
'Euston',
'King\'s',
'Farringdon',
'Barbican',
'Moorgate',
'Liverpool',
'Aldgate',
'Tower',
'Monument',
'Cannon',
'Mansion',
'Blackfriars',
'Temple',
'Embankment',
'Westminster',
'St.',
'Victoria',
'Sloane',
'South',
'Gloucester',
'High',
'Notting',
'Bayswater',
'Paddington'
];

function getStationNumber(stationName) {

var stationNameFirstWord = stationName.split(' ')[0];
var index = stopOrder.indexOf(stationNameFirstWord);
if (index === -1) console.log(stationName);
return index;
}



function filterByDirection(direction, allStationArrivalInfo) {
return allStationArrivalInfo.filter(function(stationArrivalInfo) {
return stationArrivalInfo.direction === direction;
});
}

function getDirectionFrom(towards) {
return towards === 'Edgware Road (Circle)' ? 'clockwise' : 'anti-clockwise';
}

function draw(data) {

var points = data;

var svgContainer = d3.select("body").append("svg")
.attr("width", 960)
.attr("height", 500);

var path = svgContainer.
append("path").data([points]).attr("d",
d3.svg.line().tension(.5).interpolate("cardinal-closed"));

svgContainer.selectAll(".point")
.data(points)
.enter().append("circle")
.attr("r", 4)
.attr("transform", function(d) { return "translate(" + d + ")"; });

// var circle = svg.append("circle")
// .attr("r", 13)
// .attr("transform", "translate(" + points[0] + ")");
//
// transition();
//
// function transition() {
// circle.transition()
// .duration(10000)
// .attrTween("transform", translateAlong(path.node()))
// .each("end", transition);
// }
//
// // Returns an attrTween for translating along the specified path element.
// function translateAlong(path) {
// var l = path.getTotalLength();
// return function(d, i, a) {
// return function(t) {
// var p = path.getPointAtLength(t * l);
// return "translate(" + p.x + "," + p.y + ")";
// };
// };
// }
}