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@syntagmatic

syntagmatic/README.md

Forked from mbostock/.block
Created December 10, 2012 06:43
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Null Values - Parallel Coordinates
Raw
README.md

Null values indicated by space character.

Raw
index.html
<!DOCTYPE html>
<meta charset="utf-8">
<style>
svg {
font: 10px sans-serif;
}
.background path {
fill: none;
stroke: #ccc;
stroke-opacity: .4;
shape-rendering: crispEdges;
}
.foreground path {
fill: none;
stroke: steelblue;
stroke-opacity: .7;
stroke-width: 2;
}
.brush .extent {
fill-opacity: .3;
stroke: #fff;
shape-rendering: crispEdges;
}
.axis line, .axis path {
fill: none;
stroke: #000;
shape-rendering: crispEdges;
}
.axis text {
text-shadow: 0 1px 0 #fff;
}
</style>
<body>
<script src="http://d3js.org/d3.v2.js"></script>
<script>
var m = [30, 10, 10, 10],
w = 960 - m[1] - m[3],
h = 500 - m[0] - m[2];
var x = d3.scale.ordinal().rangePoints([0, w], .5),
y = {};
var line = d3.svg.line().defined(function(d) { return d[1] != null; }),
axis = d3.svg.axis().orient("left"),
background,
foreground;
var svg = d3.select("body").append("svg")
.attr("width", w + m[1] + m[3])
.attr("height", h + m[0] + m[2])
.append("g")
.attr("transform", "translate(" + m[3] + "," + m[0] + ")");
d3.csv("sparse-data.csv", function(cities) {
// Extract the list of dimensions and create a scale for each.
x.domain(dimensions = d3.keys(cities[0]).filter(function(d) {
return d != "City" && (y[d] = d3.scale.linear()
.domain(d3.extent(cities, function(p) { return +p[d]; }))
.range([h, 0]));
}));
// Add grey background lines for context.
background = svg.append("g")
.attr("class", "background")
.selectAll("path")
.data(cities)
.enter().append("path")
.attr("d", path);
// Add blue foreground lines for focus.
foreground = svg.append("g")
.attr("class", "foreground")
.selectAll("path")
.data(cities)
.enter().append("path")
.attr("d", path);
// Add a group element for each dimension.
var g = svg.selectAll(".dimension")
.data(dimensions)
.enter().append("g")
.attr("class", "dimension")
.attr("transform", function(d) { return "translate(" + x(d) + ")"; });
// Add an axis and title.
g.append("g")
.attr("class", "axis")
.each(function(d) { d3.select(this).call(axis.scale(y[d])); })
.append("text")
.attr("text-anchor", "middle")
.attr("y", -9)
.text(String);
// Add and store a brush for each axis.
g.append("g")
.attr("class", "brush")
.each(function(d) { d3.select(this).call(y[d].brush = d3.svg.brush().y(y[d]).on("brush", brush)); })
.selectAll("rect")
.attr("x", -8)
.attr("width", 16);
});
// Returns the path for a given data point.
function path(d) {
return line(dimensions.map(function(p) {
// check for undefined values
if (d[p] == " ") return [x(p), null];
return [x(p), y[p](d[p])];
}));
}
// Handles a brush event, toggling the display of foreground lines.
function brush() {
var actives = dimensions.filter(function(p) { return !y[p].brush.empty(); }),
extents = actives.map(function(p) { return y[p].brush.extent(); });
foreground.style("display", function(d) {
return actives.every(function(p, i) {
return extents[i][0] <= d[p] && d[p] <= extents[i][1];
}) ? null : "none";
});
}
</script>
Raw
sparse-data.csv
a b c d e f
2 7 3 9 8
2 1 8 3 2
3 2 4 1
5 2 4
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