// shim layer with setTimeout fallback
window.requestAnimFrame = window.requestAnimationFrame ||
window.webkitRequestAnimationFrame ||
window.mozRequestAnimationFrame ||
window.oRequestAnimationFrame ||
window.msRequestAnimationFrame ||
function( callback ){
window.setTimeout(callback, 1000 / 60);
};
d3.select("#dark-theme")
.on("click", function() {
d3.select("body").attr("class", "dark");
});
d3.select("#light-theme")
.on("click", function() {
d3.select("body").attr("class", null);
});
var width = document.body.offsetWidth,
height = document.body.offsetHeight;
var m = [60, 0, 10, 0],
w = width - m[1] - m[3],
h = 220 - m[0] - m[2];
var xscale = d3.scale.ordinal().rangePoints([0, w], 1),
yscale = {};
var line = d3.svg.line(),
axis = d3.svg.axis().orient("left"),
foreground,
dimensions,
n_dimensions,
brush_count = 0;
var colors = {
"Dairy and Egg Products": [28,100,52],
"Spices and Herbs": [214,55,79],
"Baby Foods": [185,56,73],
"Fats and Oils": [30,100,73],
"Poultry Products": [359,69,49],
"Soups, Sauces, and Gravies": [110,57,70],
"Vegetables and Vegetable Products": [120,56,40],
"Sausages and Luncheon Meats": [1,100,79],
"Breakfast Cereals": [271,39,57],
"Fruits and Fruit Juices": [274,30,76],
"Nut and Seed Products": [10,30,42],
"Beverages": [10,28,67],
"Finfish and Shellfish Products": [318,65,67],
"Legumes and Legume Products": [334,80,84],
"Baked Products": [37,50,75],
"Sweets": [339,60,75],
"Cereal Grains and Pasta": [56,58,73],
"Pork Products": [339,60,49],
"Beef Products": [325,50,39],
"Lamb, Veal, and Game Products": [20,49,49],
"Fast Foods": [60,86,61],
"Meals, Entrees, and Sidedishes": [185,80,45],
"Snacks": [189,57,75],
"Ethnic Foods": [41,75,61],
"Restaurant Foods": [204,70,41]
};
var legend = d3.select("#legend")
.selectAll(".row")
.data(d3.keys(colors))
.enter().append("div")
.attr("class", "row");
legend
.append("span")
.text(function(d,i) { return d});
legend
.append("span")
.style("background", function(d,i) { return color(d,0.85)})
.attr("class", "color-block");
d3.select("#chart")
.style("width", (w + m[1] + m[3]) + "px")
.style("height", (h + m[0] + m[2]) + "px")
d3.selectAll("canvas")
.attr("width", w)
.attr("height", h)
.style("padding", m.join("px ") + "px");
foreground = document.getElementById('foreground').getContext('2d');
foreground.strokeStyle = "rgba(0,100,160,0.1)";
foreground.lineWidth = 1.3; // avoid weird subpixel effects
foreground.fillText("Loading...",w/2,h/2);
var svg = d3.select("svg")
.attr("width", w + m[1] + m[3])
.attr("height", h + m[0] + m[2])
.append("svg:g")
.attr("transform", "translate(" + m[3] + "," + m[0] + ")");
d3.csv("nutrients.csv", function(data) {
// Convert quantitative scales to floats
data = data.map(function(d) {
for (var k in d) {
if (k != "name" && k != "group" && k != "id")
d[k] = parseFloat(d[k]) || 0;
};
return d;
});
// Extract the list of dimensions and create a scale for each.
xscale.domain(dimensions = d3.keys(data[0]).filter(function(d) {
return d != "name" && d != "group" && d != "id" &&(yscale[d] = d3.scale.linear()
.domain(d3.extent(data, function(p) { return +p[d]; }))
.range([h, 0]));
}));
n_dimensions = dimensions.length;
// Render full foreground
paths(data, foreground, brush_count);
// Add a group element for each dimension.
var g = svg.selectAll(".dimension")
.data(dimensions)
.enter().append("svg:g")
.attr("class", "dimension")
.attr("transform", function(d) { return "translate(" + xscale(d) + ")"; });
// Add and store a brush for each axis.
g.append("svg:g")
.attr("class", "brush")
.each(function(d) { d3.select(this).call(yscale[d].brush = d3.svg.brush().y(yscale[d]).on("brush", brush)); })
.selectAll("rect")
.style("visibility", null)
.attr("x", -14)
.attr("width", 28)
.attr("rx", 0)
.attr("ry", 0);
// Add an axis and title.
g.append("svg:g")
.attr("class", "axis")
.attr("transform", "translate(10,0)")
.each(function(d) { d3.select(this).call(axis.scale(yscale[d])); })
.append("svg:text")
.attr("text-anchor", "middle")
.attr("y", -16)
.attr("x", -12)
.attr("class", "label")
.text(String);
// Handles a brush event, toggling the display of foreground lines.
function brush() {
brush_count++;
var actives = dimensions.filter(function(p) { return !yscale[p].brush.empty(); }),
extents = actives.map(function(p) { return yscale[p].brush.extent(); });
// Get lines within extents
var selected = [];
data.map(function(d) {
return actives.every(function(p, i) {
return extents[i][0] <= d[p] && d[p] <= extents[i][1];
}) ? selected.push(d) : null;
});
// Render selected lines
paths(selected, foreground, brush_count);
}
function paths(data, ctx, count) {
var n = data.length,
i = 0,
opacity = d3.min([2/Math.pow(n,0.37),1]);
d3.select("#selected-count").text(n);
d3.select("#opacity").text((""+opacity).slice(0,6));
data = _.shuffle(data);
// data table
var foodText = "";
data.slice(0,80).forEach(function(d) {
foodText += "" + d.name + "
";
});
d3.select("#food-list").html(foodText);
ctx.clearRect(0,0,w+1,h+1);
function render() {
var max = d3.min([i+40, n]);
data.slice(i,max).forEach(function(d) {
path(d, foreground, color(d.group,opacity));
});
i = max;
d3.select("#rendered-count").text(i);
};
// render all lines until finished or a new brush event
(function animloop(){
if (i >= n || count < brush_count) return;
requestAnimFrame(animloop);
render();
})();
};
});
function path(d, ctx, color) {
if (color) ctx.strokeStyle = color;
var x0 = xscale(0);
y0 = yscale[dimensions[0]](d[dimensions[0]]); // left edge
ctx.moveTo(x0+20,y0);
ctx.beginPath();
dimensions.map(function(p,i) {
var x = xscale(p)-14,
y = yscale[p](d[p]);
ctx.lineTo(x, y);
x0 = x+28;
y0 = y;
ctx.moveTo(x0, y0);
});
ctx.stroke();
};
function color(d,a) {
var c = colors[d];
return ["hsla(",c[0],",",c[1],"%,",c[2],"%,",a,")"].join("");
};