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d3_nytimes.html
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<p class="g-error">This interactive graphic requires a browser with SVG support, such as <a href="http://www.google.com/chrome">Chrome</a>, <a href="http://www.mozilla.org/en-US/firefox/">Firefox</a>, <a href="http://www.apple.com/safari/download/">Safari</a> or the latest <a href="http://windows.microsoft.com/en-US/internet-explorer/products/ie/home">Internet Explorer 9</a>.</p>
<![endif]-->
<div class="g-controls"></div>
<div class="g-chart">
<div class="g-heads">
<img class="g-dem" src="http://graphics8.nytimes.com/newsgraphics/2012/10/12/electoral-calculator/844a82453f26e9dda798a86b6fb690ca049e0a19/obama-head.png">
<img class="g-rep" src="http://graphics8.nytimes.com/newsgraphics/2012/10/12/electoral-calculator/844a82453f26e9dda798a86b6fb690ca049e0a19/romney-head.png">
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<div class="g-scenario-group">
<div class="g-scenario g-scenario-1">
<h3>Florida is a Must Win for Romney</h3>
<p>If Mr. Romney loses Florida, he has only one way to victory: through all the other battleground states. He has led most polls there, however, and is the favorite. If Mr. Romney wins Florida, he has 75 paths open to him.</p>
<div class="g-preview"></div>
<button class="g-button" data-view="FL=dem">View Obama wins Florida</button>
</div>
<div class="g-scenario g-scenario-2">
<h3>Ohio: Obama's Firewall</h3>
<p>Of the three largest battleground states, Mr. Obama has the largest lead in Ohio – partly because of a strong local economy and the auto industry bailout. If he loses here, it's likely he will trail in Florida and North Carolina too. Losing all three leaves him with only 14 ways to win.</p>
<div class="g-preview"></div>
<button class="g-button" data-view="FL=rep&OH=rep&NC=rep">View Romney wins Ohio, Fla. & N.C.</button>
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<div class="g-scenario g-scenario-3">
<h3>Times's Battlegrounds</h3>
<p>Nine states are shown above, but The Times rates only seven of them as battlegrounds. If Nevada goes to Mr. Obama and North Carolina goes to Mr. Romney, as The Times’s ratings suggest, the president will have four times as many paths to victory as his opponent.</p>
<div class="g-preview"></div>
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<div class="g-scenario g-scenario-4">
<h3>Edge of Your Seat Possibilities</h3>
<p>There are five paths to a tie. In this case, the newly elected House of Representatives would select the president (likely Mr. Romney) and the Senate would select the vice president (possibly Joseph R. Biden Jr.).</p>
<div class="g-preview"></div>
</div>
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.data(["dem", "rep", "dem-active", "rep-active"])
.enter().append("marker")
.attr("id", function(d) { return "g-arrowhead-" + d; })
.attr("viewBox", "-.1 -5 10 10")
.attr("orient", "auto")
.append("path")
.attr("d", "M-.1,-4L3.9,0L-.1,4")
.attr("class", function(d) { return "g-marker g-" + d; });
d3.tsv("states.tsv", function(error, states) {
var category = d3.scale.threshold()
.domain([.6, .75, .92]) // .9
.range(["tossup", "lean", "likely", "safe"]);
var root = {
demvotes: 0,
repvotes: 0,
probability: 1,
party: null,
state: {}
};
states.forEach(function(d) {
d.dem = +d.dem;
d.rep = +d.rep;
d.votes = +d.votes;
d.category = category(Math.max(d.dem, d.rep));
if (d.category === "safe") {
if (d.dem > d.rep) root.demvotes += d.votes;
else root.repvotes += d.votes;
}
});
states = states
.filter(function(d) { return d.category !== "safe"; })
.sort(function(a, b) { return b.votes - a.votes || a.name.localeCompare(b.name); })
.map(function(d, i) { d.index = i; return d; });
var tree = d3.layout.tree()
.size([width, states.length])
.separation(function(a, b) { return (a.probability + b.probability + .1) * (states.length - a.depth + 1); })
.children(function(d, i) {
if (i < states.length) {
var s = states[i];
return Math.max(d.demvotes, d.repvotes) < 270 && [
{party: "dem", state: s, probability: d.probability / 2, demvotes: d.demvotes + s.votes, repvotes: d.repvotes},
{party: "rep", state: s, probability: d.probability / 2, demvotes: d.demvotes, repvotes: d.repvotes + s.votes}
];
}
});
var nodesByKey,
oldNodesByKey,
oldStates = states.slice(),
bisect = d3.bisector(function(d) { return d.index; }).left,
nodes = [],
links = [],
node = svg.selectAll(".g-node"),
link = svg.selectAll(".g-link"),
state = svg.selectAll(".g-state");
var resetButton = d3.select(".g-controls").append("a")
.attr("class", "g-reset")
.text("Reset")
.on("click", function() { reset(); transition(); });
var control = d3.select(".g-controls").selectAll(".g-control")
.data(states)
.enter().append("div")
.attr("class", "g-control");
var controlButton = control.selectAll("button")
.data(function(d) {
return ["dem", "rep"].map(function(o) {
return {state: d, outcome: o};
});
})
.enter().append("button")
.attr("class", function(d) { return "g-button g-" + d.outcome; })
.text(function(d) { return d.outcome; })
.on("click", function(view) { change(view); transition(); });
control.append("span")
.text(function(d) { return d.abbreviation; });
var scoreboard = svg.append("g")
.attr("class", "g-scoreboard")
.attr("transform", "translate(" + ((width + margin.left + margin.right) / 2 - margin.left) + ",0)");
var kicker = scoreboard.append("text")
.attr("class", "g-kicker")
.attr("y", -52);
scoreboard.append("rect")
.attr("x", -280)
.attr("y", -80)
.attr("width", 280 * 2)
.attr("height", 80)
scoreboard.append("path")
.attr("d", "M-280,0H-20l20,20L20,0H280");
var candidateScores = [
{party: "dem", position: -280, align: "start"},
{party: "rep", position: 280, align: "end"},
{party: "tie", position: null, align: "middle"}
];
scoreboard.selectAll(".g-prefix")
.data(candidateScores)
.enter().append("text")
.attr("class", function(d) { return "g-" + d.party + " g-prefix"; })
.attr("x", function(d) { return d.position; })
.attr("y", "-1.2em")
.style("text-anchor", function(d) { return d.align; })
.text(function(d) { return d.party === "tie" ? "" : formatCandidate[d.party] + " has "; });
scoreboard.selectAll(".g-prefix").append("tspan")
.attr("class", "g-score");
scoreboard.selectAll(".g-prefix").append("tspan")
.attr("class", "g-suffix");
scoreboard.append("text")
.attr("class", "g-ratio g-dem")
.attr("y", "-0.8em")
.attr("x", -168);
scoreboard.append("text")
.attr("class", "g-ratio g-rep")
.attr("y", "-0.8em")
.attr("x", 170);
scoreboard.append("text")
.attr("class", "g-ratio g-tie")
.attr("y", "-0.8em");
var endAlert = svg.append("text")
.attr("class", "g-alert")
.attr("transform", "translate(" + ((width + margin.left + margin.right) / 2 - margin.left) + ",35)");
endAlert.append("tspan")
.attr("x", 0)
.text("With these selections,");
endAlert.append("tspan")
.attr("class", "g-output")
.attr("x", 0)
.attr("y", "1.5em")
.attr("class", "g-output");
var scenarioButton = d3.selectAll(".g-scenario .g-button")
.on("click", function() {
var outcome = {};
this.getAttribute("data-view").split("&").forEach(function(view) { outcome[view.substring(0, 2)] = view.substring(3); });
controlButton.filter(function(d) {
return d.state.enabledParty != outcome[d.state.code]
&& (!outcome[d.state.code] && d.state.enabledParty
? d.outcome === d.state.enabledParty
: d.outcome === outcome[d.state.code]);
}).each(change);
transition();
});
update();
function update() {
root.children = null;
nodes = tree.size([width, 1]).nodes(root);
links = tree.links(nodes).reverse();
root.x = (width + margin.right - margin.left) / 2;
//
nodesByKey = {};
nodes.forEach(function(d) { nodesByKey[d.key = key(d)] = d; });
updateStates();
updateNodes();
updateLinks();
updateVoronoi();
updateScoreboard();
}
function updateStates() {
state = state.data(states, function(d) { return d.code; });
d3.transition(state.exit())
.style("fill-opacity", 1e-6)
.attr("transform", function(d) { return "translate(" + (-margin.left + 10) + "," + y(bisect(states, d.index)) + ")"; })
.remove();
var stateEnter = state.enter().insert("g", ".g-scoreboard,.g-node,.g-link")
.style("fill-opacity", 1e-6)
.attr("class", "g-state")
.attr("transform", function(d) { return "translate(" + (-margin.left + 10) + "," + y(bisect(oldStates, d.index)) + ")"; });
d3.transition(state)
.style("fill-opacity", 1)
.attr("transform", function(d, i) { return "translate(" + (-margin.left + 10) + "," + y(i + 1) + ")"; });
stateEnter.append("line")
.attr("x2", width + margin.left - 10);
stateEnter.append("rect")
.attr("y", -16)
.attr("width", 12)
.attr("height", 12);
stateEnter.selectAll("text")
.data(["dem", "rep"])
.enter().append("text")
.attr("class", function(d) { return "g-" + d; })
.attr("y", -6)
.attr("x", 6)
.style("text-anchor", "middle")
.text(function(d) { return d.substring(0, 1).toUpperCase(); });
stateEnter.append("text")
.attr("x", 16)
.attr("y", -6)
.text(function(d) { return d.name; });
}
function updateLinks() {
link = link.data(links, function(d) { return d.target.key; });
var linkEnter = link.enter().insert("path", ".g-node")
.attr("d", function(d) { var p = findOldParent(d.target); return diagonal({source: p, target: p}); })
.attr("class", function(d) { return "g-link g-" + d.target.party; })
.attr("marker-end", function(d) { return "url(#g-arrowhead-" + d.target.party + ")"; });
d3.transition(link.exit())
.attr("d", function(d) { var p = findParent(d.target); return diagonal({source: p, target: p}); })
.remove();
d3.selectAll(".g-link")
.sort(ascendingDepth);
d3.transition(link)
.attr("d", diagonal)
.style("stroke-width", function(d) { return w(d.target.probability) + "px"; });
}
function updateNodes() {
node = node.data(nodes.slice(1), function(d) { return d.key; })
.each(function(d) { d.update = true; });
var nodeExit = d3.transition(node.exit())
.attr("class", function(d) { return "g-node g-" + d.party; })
.attr("transform", function(d) { var p = findParent(d); return "translate(" + p.x + "," + y(p.depth) + ")"; })
.remove();
var nodeEnter = node.enter().insert("g", ".g-scoreboard")
.attr("class", function(d) { return "g-node g-" + d.party; })
.attr("transform", function(d) { var p = findOldParent(d); return "translate(" + p.x + "," + y(p.depth) + ")"; });
d3.transition(node)
.attr("class", function(d) { return "g-node g-" + d.party + (d.depth === 1 ? " g-first" : ""); })
.attr("transform", function(d) { return "translate(" + d.x + "," + y(d.depth) + ")"; });
updateLabels(nodeEnter, nodeExit);
updateLeaves(nodeEnter, nodeExit);
}
function updateLabels(nodeEnter, nodeExit) {
var textEnter = nodeEnter.append("text").classed("g-label", true).attr("y", -6);
textEnter.append("tspan").attr("class", "g-label-line1");
textEnter.append("tspan").attr("class", "g-label-line2").attr("x", 0).attr("dy", ".71em");
node.select(".g-label-line1")
.attr("y", function(d) { return d.children ? null : -radius(d.depth) - 3; })
.text(function(d) {
var firstOfParty = true, p = d.parent;
while (p && p.parent && firstOfParty) {
if (p.party === d.party) firstOfParty = false;
p = p.parent;
}
return firstOfParty ? "If " + formatCandidate[d.party] + " wins " + d.state.name + "\u2026"
: d.children ? " " + d.state.abbreviation + ","
: " and " + d.state.abbreviation + ",";
});
node.select(".g-label-line2")
.attr("y", function(d) { return radius(d.depth) + 3; })
.text(function(d) {
return d.children ? null : (d.demvotes === d.repvotes ? " the candidates tie." : formatCandidate[d.party] + " wins.");
});
}
function updateLeaves(nodeEnter, nodeExit) {
var leaf = node.selectAll(".g-leaf")
.data(function(d) { return d.children ? [] : [d]; });
var leafEnter = leaf.enter().insert("g", "text")
.attr("class", function(d) { return "g-leaf" + (d.demvotes === d.repvotes ? " g-tie" : ""); })
.attr("transform", "scale(0)");
leafEnter.append("circle")
.attr("r", 50);
leafEnter.append("path")
.attr("class", "g-check")
.attr("transform", "translate(-8,16)")
.attr("d", "M-20,-20L0,0L38,-38");
d3.transition(leaf.exit())
.attr("transform", "scale(0)")
.remove();
nodeExit.select(".g-leaf")
.attr("transform", "scale(0)");
d3.transition(leaf)
.attr("transform", function(d) { return "scale(" + radius(d.depth) + ")scale(.02)"; });
}
function updateVoronoi() {
svg.select(".g-voronoi").remove();
svg.append("g")
.attr("class", "g-voronoi")
.call(voronoi, nodes);
}
function updateScoreboard() {
var demPaths = 0,
repPaths = 0,
tiePaths = 0;
nodes.forEach(function(d) {
if (!d.children) {
var n = Math.pow(2, states.length - d.depth);
if (d.demvotes > d.repvotes) demPaths += n;
else if (d.repvotes > d.demvotes) repPaths += n;
else tiePaths += n;
}
});
//
kicker.text("With " + formatNumber(states.length) + " state" + (states.length > 1 ? "s" : "") + " undecided:");
scoreboard.select(".g-prefix.g-dem .g-score").text(demPaths);
scoreboard.select(".g-prefix.g-dem .g-suffix").text(" way" + ((demPaths === 1) ? "" : "s") + " to win");
scoreboard.select(".g-prefix.g-rep .g-score").text(repPaths);
scoreboard.select(".g-prefix.g-rep .g-suffix").text(" way" + ((repPaths === 1) ? "" : "s") + " to win");
scoreboard.select(".g-prefix.g-tie .g-score").text(tiePaths);
scoreboard.select(".g-prefix.g-tie .g-suffix").text(" tie" + ((tiePaths === 1) ? "" : "s"));
//
var totalPaths = 1 << states.length;
scoreboard.select(".g-dem.g-ratio").text(formatPercent(demPaths / totalPaths) + " of paths");
scoreboard.select(".g-rep.g-ratio").text(formatPercent(repPaths / totalPaths) + " of paths");
scoreboard.select(".g-tie.g-ratio").text(formatPercent(tiePaths / totalPaths) + " of paths");
if (nodes.length === 1) {
endAlert.select(".g-output").text((root.demvotes > root.repvotes ? "Obama wins" : root.demvotes < root.repvotes ? "Romney wins" : "the candidates tie") + " in all scenarios.");
endAlert.transition().style("opacity", 1);
if (root.demvotes > root.repvotes) {
d3.select(".g-heads .g-dem").style("opacity", 1).style("left", "-100px");
d3.select(".g-heads .g-rep").style("opacity", 0).style("left", "-100px");
} else if (root.demvotes < root.repvotes) {
d3.select(".g-heads .g-rep").style("opacity", 1).style("left", "-100px");
d3.select(".g-heads .g-dem").style("opacity", 0).style("left", "-100px");
} else {
d3.select(".g-heads .g-dem").style("opacity", 1).style("left", "-220px");
d3.select(".g-heads .g-rep").style("opacity", 1).style("left", "20px");
}
} else {
endAlert.transition().style("opacity", 0);
d3.select(".g-heads .g-dem").style("opacity", 0);
d3.select(".g-heads .g-rep").style("opacity", 0);
}
}
function reset() {
controlButton.filter(function(d) { return d.outcome === d.state.enabledParty; }).each(change);
}
function change(view) {
var key = view.state.code + "=" + view.outcome;
if (view.state.enabledParty) {
root[view.state.enabledParty + "votes"] -= view.state.votes;
states.splice(bisect(states, view.state.index), 0, view.state);
}
var i = bisect(oldStates, view.state.index) + 1;
if (view.outcome === view.state.enabledParty) {
view.state.enabledParty = null;
// Add the exiting state to nodes below.
nodes.forEach(function(d) {
if (d.depth >= i) d.key = d.key.split("&").concat(key).sort().join("&");
});
} else {
if ((root[view.outcome + "votes"] += view.state.votes) >= 270) root.party = view.outcome;
view.state.enabledParty = view.outcome;
states.splice(states.indexOf(view.state), 1);
// Remove the entering state from nodes below.
var k = new RegExp("&" + key + "|" + key + "&");
nodes.forEach(function(d) {
if (d.depth > i) d.key = d.key.replace(k, "");
});
}
}
function transition() {
controlButton.classed("g-active", function(d) { return d.state.enabledParty === d.outcome; });
resetButton.style("display", states.length < y.domain()[1] ? "block" : "none");
// Old node positions indexed by new key are needed for enter transitions.
oldNodesByKey = {};
nodes.forEach(function(d) { oldNodesByKey[d.key] = d; });
d3.transition().duration(d3.event.altKey ? 7500 : 750).each(update);
// The previous states are needed when multiple changes are made pre-transition.
oldStates = states.slice();
}
function click(d) {
mouseout(d);
var p = d.parent;
while (p) {
if (p.parent === root) { d = p; break; }
p = p.parent;
}
if (d !== root) {
change({state: d.state, outcome: d.party});
transition();
}
}
function mouseover(d) {
activate(d, true);
svg.attr("class", "g-" + d.party);
node.filter(function(d) { return d.active; }).classed("g-active", true);
link.filter(function(d) { return d.target.active; }).classed("g-active", true).attr("marker-end", function(d) { return "url(#g-arrowhead-" + d.target.party + "-active)"; });
state.attr("class", function(d) { return "g-state" + (d.activeParty ? " g-" + d.activeParty : ""); });
}
function mouseout(d) {
node.filter(function(d) { return d.active; }).classed("g-active", false);
link.filter(function(d) { return d.target.active; }).classed("g-active", false).attr("marker-end", function(d) { return "url(#g-arrowhead-" + d.target.party + ")"; });
state.attr("class", "g-state");
activate(d, false);
}
function activate(d, active) {
d.active = active;
d.state.activeParty = active ? d.party : null;
d.parent && activate(d.parent, active);
}
function voronoi(g, nodes) {
nodes = nodes.filter(function(d) { return !d.children; });
var x0 = -margin.left, y0 = 0,
x1 = width + margin.right, y1 = height + margin.left,
xy = d3.geom.polygon([[x0, y0], [x0, y1], [x1, y1], [x1, y0]]);
var path = g.selectAll("path")
.data(d3.geom.voronoi(nodes.map(function(d) { return [d.x, y(d.depth)]; })));
path.enter().append("path")
.on("mouseover", mouseover)
.on("mouseout", mouseout)
.on("mousedown", function() { d3.event.preventDefault(); })
.on("dblclick", click);
path.attr("d", function(d) { return "M" + xy.clip(d).join("L") + "Z"; })
.datum(function(d, i) { return nodes[i]; });
path.exit().remove();
}
function key(d) {
if (!d.parent) return "_root";
var k = [], p = d;
while (p && p.party) k.push(p.state.code + "=" + p.party), p = p.parent;
return k.sort().join("&");
}
function findParent(d) {
var p = d.parent;
while (p) {
if ((d = nodesByKey[p.key]) && d.update) return d;
p = p.parent;
}
return root;
}
function findOldParent(d) {
var p = findParent(d);
return oldNodesByKey ? oldNodesByKey[p.key] : p;
}
});