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295 lines (240 loc) · 9.15 KB
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function set_values(timelineData,dateParsed){
// adjusts the location of elements and timeline
var mapWidth = window.innerWidth * 0.5
var mapHeight = window.innerHeight * 0.8
var tweetLeftMargin = (mapWidth + 80) + 'px'
var tweetTopMargin = (-(window.innerHeight)+33)+'px'
d3.select('#photo')
.style("margin-left",tweetLeftMargin)
.style("margin-top",tweetTopMargin+80);
d3.select("#tweet")
.style("margin-left",tweetLeftMargin)
.style("margin-top",tweetTopMargin);
d3.select('#map')
.attr('width',mapWidth)
.attr('height',mapHeight);
// Create timeline
create_timeline(timelineData,mapWidth,dateParsed);
}
function create_random_values(){
// used to jitter points
var num = 0.05
return [getRandomArbitrary(-num,num),getRandomArbitrary(-num,num)]
}
function getRandomArbitrary(min, max) {
return Math.random() * (max - min) + min;
}
function addPoints(x,map){
// adds geo as circles to map
var rand = create_random_values();
var parseDate = d3.time.format("%Y-%m-%d %H:%M:%S").parse;
var dateParsed = parseDate(x.key);
// dateTag is used to class each tweet in a time bucket - currently hardcoded for the hourly bucket
var dateTag = dateParsed.toString().split(':')[0].replace(/ /g,'_');
if (x.value.hasOwnProperty("tweets")){
// checks to see if the times series contains tweet data and then uses geo to create circle on map
x.value.tweets.features.forEach(function(d,i){
var circle = L.circle([parseFloat(d.geometry.coordinate[1])+rand[0],parseFloat(d.geometry.coordinate[0])+rand[1]],200, {
color: 'steelblue',
fillColor: 'steelblue',
fillOpacity: 0.2,
className: "tweet_location_pre_data",
radius: 1
}).addTo(map);
// adds data to each circle
var circleData = d3.selectAll(".tweet_location_pre_data")
.classed("tweet_location_pre_data",false)
.classed("tweet_location " + dateTag,true)
.attr("id","tweetID_"+d.properties.tweet.split('/')[5])
.attr("media",d.properties.link)
.attr("tweet",d.properties.tweet)
.attr("user",d.properties.user_id)
.attr("date",dateParsed);
})
};
}
function build_map(){
// uses leaflet.js to build a zoomable map
var map = L.map('map').setView([40.0274,-105.2519],13);
var stamen = L.tileLayer('http://{s}.tile.stamen.com/toner/{z}/{x}/{y}.png', {attribution: 'dev.'}).addTo(map);
var toolserver = L.tileLayer('http://{s}.www.toolserver.org/tiles/bw-mapnik/{z}/{x}/{y}.png');
var baseLayers = {"stamen": stamen, "toolserver-mapnik":toolserver};
L.control.layers(baseLayers).addTo(map);
return map;
}
function create_timeline_data(dataArray){
var data = {};
dataArray.forEach(function(d,i){
if (d.value.hasOwnProperty("tweets")){
data[d.key] = d.value.tweets.features.length
}else{
data[d.key] = 0
}
})
return d3.entries(data)
}
function create_timeline(data,mapWidth,dateParsed){
// remove old timeline
d3.select("#timeline").selectAll("*").remove();
var windowHeight = window.innerHeight;
var bisectDate = d3.bisector(function(d) { return d.key; }).left;
var margin = {top: windowHeight*0.1, right: 0, bottom: windowHeight*0.1, left: 50},
width = mapWidth,
height = windowHeight*0.3 - margin.top - margin.bottom;
var parseDate = d3.time.format("%Y-%m-%d %H:%M:%S").parse;
var x = d3.time.scale()
.range([0, width]);
var y = d3.scale.linear()
.range([height, 0]);
// https://github.com/mbostock/d3/wiki/Time-Formatting
var xAxis = d3.svg.axis()
.scale(x)
.ticks(Math.max(width/200,2))
.tickFormat(d3.time.format("%b %d"))
.orient("bottom");
var yAxis = d3.svg.axis()
.scale(y)
.ticks(Math.max(height/50,2))
.orient("left");
var line = d3.svg.line()
.x(function(d) { return x(d.key); })
.y(function(d) { return y(d.value); });
var svg = d3.select("#timeline")
.classed("timeline",true)
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom)
.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
// transform date string into date object
data.forEach(function(d) {
if (!dateParsed){
d.key = parseDate(d.key);
}
d.value = +d.value;
});
// add range to scales
x.domain(d3.extent(data, function(d) { return d.key; }));
y.domain(d3.extent(data, function(d) { return d.value; }));
// create x axis
svg.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + height + ")")
.call(xAxis);
// append the circle at the intersection
var focus = svg.append("g")
.style("display", "none");
// create conditional y axis
if (windowHeight > 600){
svg.append("g")
.attr("class", "y axis")
.call(yAxis)
svg.append("text")
.attr("transform", "rotate(-90)")
.attr("y", 6)
.attr("dy", ".71em")
.style("text-anchor", "end")
.text("Tweets");
};
// create timeline line
svg.append("path")
.datum(data)
.attr("class", "line")
.attr("d", line);
// append the circle at the intersection
focus.append("circle")
.attr("class", "y")
.style("fill", "none")
.style("stroke", "steelblue")
.style("stroke-width",2)
.attr("r", 4);
// append moving red circle to timeline at the intersection
focus.append("circle")
.attr("class", "y")
.style("fill", "none")
.style("stroke", "steelblue")
.style("stroke-width",2)
.attr("r", 8)
// append the rectangle to capture mouse
svg.append("rect")
.attr("width", width)
.attr("height", height)
.style("fill", "none")
.style("pointer-events", "all")
.on("mouseover", function() { focus.style("display", null); })
.on("mouseout", function() { focus.style("display", "none"); })
.on("mousemove", mousemove);
function mousemove() {
// x0 is the x-coordinate associated with the mouse location on the timeline
var x0 = x.invert(d3.mouse(this)[0]),
i = bisectDate(data, x0, 1),
d0 = data[i - 1],
d1 = data[i],
d = x0 - d0.key > d1.key - x0 ? d1 : d0;
// dateTag needs to be reconsidered - the split hardcodes hourly buckets
var dateTag = (x0.toString()).split(':')[0].replace(/ /g,'_')
// color circles on map w/ corresponding date
d3.selectAll('.'+dateTag)
.style("fill","red")
.style("fill-opacity",1)
.style("stroke","red")
.style("stroke-opacity",1)
.transition()
.duration(2000)
.delay(0)
.style("fill","steelblue")
.style("fill-opacity",0.2)
.style("stroke","steelblue")
.style("stroke-opacity",0.5)
// create red circles on timeline
focus.append("circle")
.attr("class","remover")
.attr("cx",x(d.key))
.attr("cy",y(d.value))
.attr("fill","red")
.style("fill-opacity",0.1)
.attr("r",8)
.transition()
.duration(1000)
.delay(0)
.remove()
// move the circles at intersection of mouse w/ timeline x-axis
focus.selectAll("circle.y")
.attr("transform",
"translate(" + x(d.key) + "," + y(d.value) + ")");
}
}
d3.json("data/BoulderFlood_viewer.json", function(collection) {
console.log(["collection:",collection])
// build map and creat an svg.
var map = build_map();
// Transform object to array
var dataArray = d3.entries(collection.time_series.interval_data);
var timelineData = create_timeline_data(dataArray)
// insure that once the date strings become date objects, they do not get parsed again.
var dateParsed = false;
// Initialize map & tweet orientation.
set_values(timelineData,dateParsed);
// For each tweet, add a circle to map.
dataArray.map(function(d){addPoints(d,map)});
// Adjust map & tweet orientation when window is resized.
window.addEventListener('resize', function(event){
var dateParsed = true
set_values(timelineData,dateParsed);
});
// Mouseover event that produces embeded tweet
var circles = d3.selectAll(".tweet_location")
circles.on("mouseover",function(event){
// removes old embeded tweet
var element = d3.select(this)
d3.select("#tweet").selectAll("*").remove();
// adds new embeded tweet
twttr.widgets.createTweet(
element.attr('tweet').split('/')[5],
document.getElementById('tweet')
);
if (element.attr("media").match("instagram.com") != null){
// embeds instagram photo
d3.select('#photo').attr('src','http://instagram.com/p/' + element.attr("media").split('/')[4] +'/media/?size=l');
}
});
});