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d3.parcoords.js
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d3.parcoords = function(config) {
var __ = {
data: [],
highlighted: [],
dimensions: [],
dimensionTitles: {},
dimensionTitleRotation: 0,
types: {},
brushed: false,
brushedColor: null,
alphaOnBrushed: 0.0,
mode: "default",
rate: 20,
width: 600,
height: 300,
margin: { top: 24, right: 0, bottom: 12, left: 0 },
color: "#069",
composite: "source-over",
alpha: 0.7,
bundlingStrength: 0.5,
bundleDimension: null,
smoothness: 0.0,
showControlPoints: false,
hideAxis : []
};
extend(__, config);
var pc = function(selection) {
selection = pc.selection = d3.select(selection);
__.width = selection[0][0].clientWidth;
__.height = selection[0][0].clientHeight;
// canvas data layers
["marks", "foreground", "brushed", "highlight"].forEach(function(layer) {
canvas[layer] = selection
.append("canvas")
.attr("class", layer)[0][0];
ctx[layer] = canvas[layer].getContext("2d");
});
// svg tick and brush layers
pc.svg = selection
.append("svg")
.attr("width", __.width)
.attr("height", __.height)
.append("svg:g")
.attr("transform", "translate(" + __.margin.left + "," + __.margin.top + ")");
return pc;
};
var events = d3.dispatch.apply(this,["render", "resize", "highlight", "brush", "brushend", "axesreorder"].concat(d3.keys(__))),
w = function() { return __.width - __.margin.right - __.margin.left; },
h = function() { return __.height - __.margin.top - __.margin.bottom; },
flags = {
brushable: false,
reorderable: false,
axes: false,
interactive: false,
debug: false
},
xscale = d3.scale.ordinal(),
yscale = {},
dragging = {},
line = d3.svg.line(),
axis = d3.svg.axis().orient("left").ticks(5),
g, // groups for axes, brushes
ctx = {},
canvas = {},
clusterCentroids = [];
// side effects for setters
var side_effects = d3.dispatch.apply(this,d3.keys(__))
.on("composite", function(d) {
ctx.foreground.globalCompositeOperation = d.value;
ctx.brushed.globalCompositeOperation = d.value;
})
.on("alpha", function(d) {
ctx.foreground.globalAlpha = d.value;
ctx.brushed.globalAlpha = d.value;
})
.on("brushedColor", function (d) {
ctx.brushed.strokeStyle = d.value;
})
.on("width", function(d) { pc.resize(); })
.on("height", function(d) { pc.resize(); })
.on("margin", function(d) { pc.resize(); })
.on("rate", function(d) {
brushedQueue.rate(d.value);
foregroundQueue.rate(d.value);
})
.on("dimensions", function(d) {
xscale.domain(__.dimensions);
if (flags.interactive){pc.render().updateAxes();}
})
.on("bundleDimension", function(d) {
if (!__.dimensions.length) pc.detectDimensions();
if (!(__.dimensions[0] in yscale)) pc.autoscale();
if (typeof d.value === "number") {
if (d.value < __.dimensions.length) {
__.bundleDimension = __.dimensions[d.value];
} else if (d.value < __.hideAxis.length) {
__.bundleDimension = __.hideAxis[d.value];
}
} else {
__.bundleDimension = d.value;
}
__.clusterCentroids = compute_cluster_centroids(__.bundleDimension);
})
.on("hideAxis", function(d) {
if (!__.dimensions.length) pc.detectDimensions();
pc.dimensions(without(__.dimensions, d.value));
});
// expose the state of the chart
pc.state = __;
pc.flags = flags;
// create getter/setters
getset(pc, __, events);
// expose events
d3.rebind(pc, events, "on");
// getter/setter with event firing
function getset(obj,state,events) {
d3.keys(state).forEach(function(key) {
obj[key] = function(x) {
if (!arguments.length) {
return state[key];
}
var old = state[key];
state[key] = x;
side_effects[key].call(pc,{"value": x, "previous": old});
events[key].call(pc,{"value": x, "previous": old});
return obj;
};
});
};
function extend(target, source) {
for (key in source) {
target[key] = source[key];
}
return target;
};
function without(arr, item) {
return arr.filter(function(elem) { return item.indexOf(elem) === -1; })
};
pc.autoscale = function() {
// yscale
var defaultScales = {
"date": function(k) {
var extent = d3.extent(__.data, function(d) {
return d[k] ? d[k].getTime() : null;
});
// special case if single value
if (extent[0] === extent[1]) {
return d3.scale.ordinal()
.domain([extent[0]])
.rangePoints([h()+1, 1]);
}
return d3.time.scale()
.domain(extent)
.range([h()+1, 1]);
},
"number": function(k) {
var extent = d3.extent(__.data, function(d) { return +d[k]; });
// special case if single value
if (extent[0] === extent[1]) {
return d3.scale.ordinal()
.domain([extent[0]])
.rangePoints([h()+1, 1]);
}
return d3.scale.linear()
.domain(extent)
.range([h()+1, 1]);
},
"string": function(k) {
var counts = {},
domain = [];
// Let's get the count for each value so that we can sort the domain based
// on the number of items for each value.
__.data.map(function(p) {
if (counts[p[k]] === undefined) {
counts[p[k]] = 1;
} else {
counts[p[k]] = counts[p[k]] + 1;
}
});
domain = Object.getOwnPropertyNames(counts).sort(function(a, b) {
return counts[a] - counts[b];
});
return d3.scale.ordinal()
.domain(domain)
.rangePoints([h()+1, 1]);
}
};
__.dimensions.forEach(function(k) {
yscale[k] = defaultScales[__.types[k]](k);
});
__.hideAxis.forEach(function(k) {
yscale[k] = defaultScales[__.types[k]](k);
});
// xscale
xscale.rangePoints([0, w()], 1);
// canvas sizes
pc.selection.selectAll("canvas")
.style("margin-top", __.margin.top + "px")
.style("margin-left", __.margin.left + "px")
.attr("width", w()+2)
.attr("height", h()+2);
// default styles, needs to be set when canvas width changes
ctx.foreground.strokeStyle = __.color;
ctx.foreground.lineWidth = 1.4;
ctx.foreground.globalCompositeOperation = __.composite;
ctx.foreground.globalAlpha = __.alpha;
ctx.brushed.strokeStyle = __.brushedColor;
ctx.brushed.lineWidth = 1.4;
ctx.brushed.globalCompositeOperation = __.composite;
ctx.brushed.globalAlpha = __.alpha;
ctx.highlight.lineWidth = 3;
return this;
};
pc.scale = function(d, domain) {
yscale[d].domain(domain);
return this;
};
pc.flip = function(d) {
//yscale[d].domain().reverse(); // does not work
yscale[d].domain(yscale[d].domain().reverse()); // works
return this;
};
pc.commonScale = function(global, type) {
var t = type || "number";
if (typeof global === 'undefined') {
global = true;
}
// scales of the same type
var scales = __.dimensions.concat(__.hideAxis).filter(function(p) {
return __.types[p] == t;
});
if (global) {
var extent = d3.extent(scales.map(function(p,i) {
return yscale[p].domain();
}).reduce(function(a,b) {
return a.concat(b);
}));
scales.forEach(function(d) {
yscale[d].domain(extent);
});
} else {
scales.forEach(function(k) {
yscale[k].domain(d3.extent(__.data, function(d) { return +d[k]; }));
});
}
// update centroids
if (__.bundleDimension !== null) {
pc.bundleDimension(__.bundleDimension);
}
return this;
};
pc.detectDimensions = function() {
pc.types(pc.detectDimensionTypes(__.data));
pc.dimensions(d3.keys(pc.types()));
return this;
};
// a better "typeof" from this post: http://stackoverflow.com/questions/7390426/better-way-to-get-type-of-a-javascript-variable
pc.toType = function(v) {
return ({}).toString.call(v).match(/\s([a-zA-Z]+)/)[1].toLowerCase();
};
// try to coerce to number before returning type
pc.toTypeCoerceNumbers = function(v) {
if ((parseFloat(v) == v) && (v != null)) {
return "number";
}
return pc.toType(v);
};
// attempt to determine types of each dimension based on first row of data
pc.detectDimensionTypes = function(data) {
var types = {};
d3.keys(data[0])
.forEach(function(col) {
types[col] = pc.toTypeCoerceNumbers(data[0][col]);
});
return types;
};
pc.render = function() {
// try to autodetect dimensions and create scales
if (!__.dimensions.length) pc.detectDimensions();
if (!(__.dimensions[0] in yscale)) pc.autoscale();
pc.render[__.mode]();
events.render.call(this);
return this;
};
pc.renderBrushed = function() {
if (!__.dimensions.length) pc.detectDimensions();
if (!(__.dimensions[0] in yscale)) pc.autoscale();
pc.renderBrushed[__.mode]();
events.render.call(this);
return this;
};
function isBrushed() {
if (__.brushed && __.brushed.length !== __.data.length)
return true;
var object = brush.currentMode().brushState();
for (var key in object) {
if (object.hasOwnProperty(key)) {
return true;
}
}
return false;
}
pc.render.default = function() {
pc.clear('foreground');
pc.clear('highlight');
pc.renderBrushed.default();
__.data.forEach(path_foreground);
};
var foregroundQueue = d3.renderQueue(path_foreground)
.rate(50)
.clear(function() {
pc.clear('foreground');
pc.clear('highlight');
});
pc.render.queue = function() {
pc.renderBrushed.queue();
foregroundQueue(__.data);
};
pc.renderBrushed.default = function() {
pc.clear('brushed');
if (isBrushed()) {
__.brushed.forEach(path_brushed);
}
};
var brushedQueue = d3.renderQueue(path_brushed)
.rate(50)
.clear(function() {
pc.clear('brushed');
});
pc.renderBrushed.queue = function() {
if (isBrushed()) {
brushedQueue(__.brushed);
} else {
brushedQueue([]); // This is needed to clear the currently brushed items
}
};function compute_cluster_centroids(d) {
var clusterCentroids = d3.map();
var clusterCounts = d3.map();
// determine clusterCounts
__.data.forEach(function(row) {
var scaled = yscale[d](row[d]);
if (!clusterCounts.has(scaled)) {
clusterCounts.set(scaled, 0);
}
var count = clusterCounts.get(scaled);
clusterCounts.set(scaled, count + 1);
});
__.data.forEach(function(row) {
__.dimensions.map(function(p, i) {
var scaled = yscale[d](row[d]);
if (!clusterCentroids.has(scaled)) {
var map = d3.map();
clusterCentroids.set(scaled, map);
}
if (!clusterCentroids.get(scaled).has(p)) {
clusterCentroids.get(scaled).set(p, 0);
}
var value = clusterCentroids.get(scaled).get(p);
value += yscale[p](row[p]) / clusterCounts.get(scaled);
clusterCentroids.get(scaled).set(p, value);
});
});
return clusterCentroids;
}
function compute_centroids(row) {
var centroids = [];
var p = __.dimensions;
var cols = p.length;
var a = 0.5; // center between axes
for (var i = 0; i < cols; ++i) {
// centroids on 'real' axes
var x = position(p[i]);
var y = yscale[p[i]](row[p[i]]);
centroids.push($V([x, y]));
// centroids on 'virtual' axes
if (i < cols - 1) {
var cx = x + a * (position(p[i+1]) - x);
var cy = y + a * (yscale[p[i+1]](row[p[i+1]]) - y);
if (__.bundleDimension !== null) {
var leftCentroid = __.clusterCentroids.get(yscale[__.bundleDimension](row[__.bundleDimension])).get(p[i]);
var rightCentroid = __.clusterCentroids.get(yscale[__.bundleDimension](row[__.bundleDimension])).get(p[i+1]);
var centroid = 0.5 * (leftCentroid + rightCentroid);
cy = centroid + (1 - __.bundlingStrength) * (cy - centroid);
}
centroids.push($V([cx, cy]));
}
}
return centroids;
}
function compute_control_points(centroids) {
var cols = centroids.length;
var a = __.smoothness;
var cps = [];
cps.push(centroids[0]);
cps.push($V([centroids[0].e(1) + a*2*(centroids[1].e(1)-centroids[0].e(1)), centroids[0].e(2)]));
for (var col = 1; col < cols - 1; ++col) {
var mid = centroids[col];
var left = centroids[col - 1];
var right = centroids[col + 1];
var diff = left.subtract(right);
cps.push(mid.add(diff.x(a)));
cps.push(mid);
cps.push(mid.subtract(diff.x(a)));
}
cps.push($V([centroids[cols-1].e(1) + a*2*(centroids[cols-2].e(1)-centroids[cols-1].e(1)), centroids[cols-1].e(2)]));
cps.push(centroids[cols - 1]);
return cps;
};pc.shadows = function() {
flags.shadows = true;
pc.alphaOnBrushed(0.1);
pc.render();
return this;
};
// draw dots with radius r on the axis line where data intersects
pc.axisDots = function(r) {
var r = r || 0.1;
var ctx = pc.ctx.marks;
var startAngle = 0;
var endAngle = 2 * Math.PI;
ctx.globalAlpha = d3.min([ 1 / Math.pow(__.data.length, 1 / 2), 1 ]);
__.data.forEach(function(d) {
__.dimensions.map(function(p, i) {
ctx.beginPath();
ctx.arc(position(p), yscale[p](d[p]), r, startAngle, endAngle);
ctx.stroke();
ctx.fill();
});
});
return this;
};
// draw single cubic bezier curve
function single_curve(d, ctx) {
var centroids = compute_centroids(d);
var cps = compute_control_points(centroids);
ctx.moveTo(cps[0].e(1), cps[0].e(2));
for (var i = 1; i < cps.length; i += 3) {
if (__.showControlPoints) {
for (var j = 0; j < 3; j++) {
ctx.fillRect(cps[i+j].e(1), cps[i+j].e(2), 2, 2);
}
}
ctx.bezierCurveTo(cps[i].e(1), cps[i].e(2), cps[i+1].e(1), cps[i+1].e(2), cps[i+2].e(1), cps[i+2].e(2));
}
};
// draw single polyline
function color_path(d, ctx) {
ctx.beginPath();
if ((__.bundleDimension !== null && __.bundlingStrength > 0) || __.smoothness > 0) {
single_curve(d, ctx);
} else {
single_path(d, ctx);
}
ctx.stroke();
};
// draw many polylines of the same color
function paths(data, ctx) {
ctx.clearRect(-1, -1, w() + 2, h() + 2);
ctx.beginPath();
data.forEach(function(d) {
if ((__.bundleDimension !== null && __.bundlingStrength > 0) || __.smoothness > 0) {
single_curve(d, ctx);
} else {
single_path(d, ctx);
}
});
ctx.stroke();
};
function single_path(d, ctx) {
__.dimensions.map(function(p, i) {
if (i == 0) {
ctx.moveTo(position(p), yscale[p](d[p]));
} else {
ctx.lineTo(position(p), yscale[p](d[p]));
}
});
}
function path_brushed(d, i) {
if (__.brushedColor !== null) {
ctx.brushed.strokeStyle = d3.functor(__.brushedColor)(d, i);
} else {
ctx.brushed.strokeStyle = d3.functor(__.color)(d, i);
}
return color_path(d, ctx.brushed)
}
function path_foreground(d, i) {
ctx.foreground.strokeStyle = d3.functor(__.color)(d, i);
return color_path(d, ctx.foreground);
};
function path_highlight(d, i) {
ctx.highlight.strokeStyle = d3.functor(__.color)(d, i);
return color_path(d, ctx.highlight);
};
pc.clear = function(layer) {
ctx[layer].clearRect(0, 0, w() + 2, h() + 2);
// This will make sure that the foreground items are transparent
// without the need for changing the opacity style of the foreground canvas
// as this would stop the css styling from working
if(layer === "brushed" && isBrushed()) {
ctx.brushed.fillStyle = pc.selection.style("background-color");
ctx.brushed.globalAlpha = 1 - __.alphaOnBrushed;
ctx.brushed.fillRect(0, 0, w() + 2, h() + 2);
ctx.brushed.globalAlpha = __.alpha;
}
return this;
};
d3.rebind(pc, axis, "ticks", "orient", "tickValues", "tickSubdivide", "tickSize", "tickPadding", "tickFormat");
function flipAxisAndUpdatePCP(dimension) {
var g = pc.svg.selectAll(".dimension");
pc.flip(dimension);
d3.select(this.parentElement)
.transition()
.duration(1100)
.call(axis.scale(yscale[dimension]));
pc.render();
}
function rotateLabels() {
var delta = d3.event.deltaY;
delta = delta < 0 ? -5 : delta;
delta = delta > 0 ? 5 : delta;
__.dimensionTitleRotation += delta;
pc.svg.selectAll("text.label")
.attr("transform", "translate(0,-5) rotate(" + __.dimensionTitleRotation + ")");
d3.event.preventDefault();
}
function dimensionLabels(d) {
return d in __.dimensionTitles ? __.dimensionTitles[d] : d; // dimension display names
}
pc.createAxes = function() {
if (g) pc.removeAxes();
// Add a group element for each dimension.
g = pc.svg.selectAll(".dimension")
.data(__.dimensions, function(d) { return d; })
.enter().append("svg:g")
.attr("class", "dimension")
.attr("transform", function(d) { return "translate(" + xscale(d) + ")"; });
// Add an axis and title.
g.append("svg:g")
.attr("class", "axis")
.attr("transform", "translate(0,0)")
.each(function(d) { d3.select(this).call(axis.scale(yscale[d])); })
.append("svg:text")
.attr({
"text-anchor": "middle",
"y": 0,
"transform": "translate(0,-5) rotate(" + __.dimensionTitleRotation + ")",
"x": 0,
"class": "label"
})
.text(dimensionLabels)
.on("dblclick", flipAxisAndUpdatePCP)
.on("wheel", rotateLabels);
flags.axes= true;
return this;
};
pc.removeAxes = function() {
g.remove();
return this;
};
pc.updateAxes = function() {
var g_data = pc.svg.selectAll(".dimension").data(__.dimensions);
// Enter
g_data.enter().append("svg:g")
.attr("class", "dimension")
.attr("transform", function(p) { return "translate(" + position(p) + ")"; })
.style("opacity", 0)
.append("svg:g")
.attr("class", "axis")
.attr("transform", "translate(0,0)")
.each(function(d) { d3.select(this).call(axis.scale(yscale[d])); })
.append("svg:text")
.attr({
"text-anchor": "middle",
"y": 0,
"transform": "translate(0,-5) rotate(" + __.dimensionTitleRotation + ")",
"x": 0,
"class": "label"
})
.text(dimensionLabels)
.on("dblclick", flipAxisAndUpdatePCP)
.on("wheel", rotateLabels);
// Update
g_data.attr("opacity", 0);
g_data.select(".axis")
.transition()
.duration(1100)
.each(function(d) {
d3.select(this).call(axis.scale(yscale[d]));
});
g_data.select(".label")
.transition()
.duration(1100)
.text(dimensionLabels)
.attr("transform", "translate(0,-5) rotate(" + __.dimensionTitleRotation + ")");
// Exit
g_data.exit().remove();
g = pc.svg.selectAll(".dimension");
g.transition().duration(1100)
.attr("transform", function(p) { return "translate(" + position(p) + ")"; })
.style("opacity", 1);
pc.svg.selectAll(".axis")
.transition()
.duration(1100)
.each(function(d) { d3.select(this).call(axis.scale(yscale[d])); });
if (flags.brushable) pc.brushable();
if (flags.reorderable) pc.reorderable();
if (pc.brushMode() !== "None") {
var mode = pc.brushMode();
pc.brushMode("None");
pc.brushMode(mode);
}
return this;
};
// Jason Davies, http://bl.ocks.org/1341281
pc.reorderable = function() {
if (!g) pc.createAxes();
g.style("cursor", "move")
.call(d3.behavior.drag()
.on("dragstart", function(d) {
dragging[d] = this.__origin__ = xscale(d);
})
.on("drag", function(d) {
dragging[d] = Math.min(w(), Math.max(0, this.__origin__ += d3.event.dx));
__.dimensions.sort(function(a, b) { return position(a) - position(b); });
xscale.domain(__.dimensions);
pc.render();
g.attr("transform", function(d) { return "translate(" + position(d) + ")"; });
})
.on("dragend", function(d) {
// Let's see if the order has changed and send out an event if so.
var i = 0,
j = __.dimensions.indexOf(d),
elem = this,
parent = this.parentElement;
while((elem = elem.previousElementSibling) != null) ++i;
if (i !== j) {
events.axesreorder.call(pc, __.dimensions);
// We now also want to reorder the actual dom elements that represent
// the axes. That is, the g.dimension elements. If we don't do this,
// we get a weird and confusing transition when updateAxes is called.
// This is due to the fact that, initially the nth g.dimension element
// represents the nth axis. However, after a manual reordering,
// without reordering the dom elements, the nth dom elements no longer
// necessarily represents the nth axis.
//
// i is the original index of the dom element
// j is the new index of the dom element
if (i > j) { // Element moved left
parent.insertBefore(this, parent.children[j - 1]);
} else { // Element moved right
if ((j + 1) < parent.children.length) {
parent.insertBefore(this, parent.children[j + 1]);
} else {
parent.appendChild(this);
}
}
}
delete this.__origin__;
delete dragging[d];
d3.select(this).transition().attr("transform", "translate(" + xscale(d) + ")");
pc.render();
}));
flags.reorderable = true;
return this;
};
// Reorder dimensions, such that the highest value (visually) is on the left and
// the lowest on the right. Visual values are determined by the data values in
// the given row.
pc.reorder = function(rowdata) {
var dims = __.dimensions.slice(0);
__.dimensions.sort(function(a, b) {
var pixelDifference = yscale[a](rowdata[a]) - yscale[b](rowdata[b]);
// Array.sort is not necessarily stable, this means that if pixelDifference is zero
// the ordering of dimensions might change unexpectedly. This is solved by sorting on
// variable name in that case.
if (pixelDifference === 0) {
return a.localeCompare(b);
} // else
return pixelDifference;
});
// NOTE: this is relatively cheap given that:
// number of dimensions < number of data items
// Thus we check equality of order to prevent rerendering when this is the case.
var reordered = false;
dims.some(function(val, index) {
reordered = val !== __.dimensions[index];
return reordered;
});
if (reordered) {
xscale.domain(__.dimensions);
var highlighted = __.highlighted.slice(0);
pc.unhighlight();
g.transition()
.duration(1500)
.attr("transform", function(d) {
return "translate(" + xscale(d) + ")";
});
pc.render();
// pc.highlight() does not check whether highlighted is length zero, so we do that here.
if (highlighted.length !== 0) {
pc.highlight(highlighted);
}
}
}
// pairs of adjacent dimensions
pc.adjacent_pairs = function(arr) {
var ret = [];
for (var i = 0; i < arr.length-1; i++) {
ret.push([arr[i],arr[i+1]]);
};
return ret;
};
var brush = {
modes: {
"None": {
install: function(pc) {}, // Nothing to be done.
uninstall: function(pc) {}, // Nothing to be done.
selected: function() { return []; }, // Nothing to return
brushState: function() { return {}; }
}
},
mode: "None",
predicate: "AND",
currentMode: function() {
return this.modes[this.mode];
}
};
// This function can be used for 'live' updates of brushes. That is, during the
// specification of a brush, this method can be called to update the view.
//
// @param newSelection - The new set of data items that is currently contained
// by the brushes
function brushUpdated(newSelection) {
__.brushed = newSelection;
events.brush.call(pc,__.brushed);
pc.renderBrushed();
}
function brushPredicate(predicate) {
if (!arguments.length) { return brush.predicate; }
predicate = String(predicate).toUpperCase();
if (predicate !== "AND" && predicate !== "OR") {
throw "Invalid predicate " + predicate;
}
brush.predicate = predicate;
__.brushed = brush.currentMode().selected();
pc.renderBrushed();
return pc;
}
pc.brushModes = function() {
return Object.getOwnPropertyNames(brush.modes);
};
pc.brushMode = function(mode) {
if (arguments.length === 0) {
return brush.mode;
}
if (pc.brushModes().indexOf(mode) === -1) {
throw "pc.brushmode: Unsupported brush mode: " + mode;
}
// Make sure that we don't trigger unnecessary events by checking if the mode
// actually changes.
if (mode !== brush.mode) {
// When changing brush modes, the first thing we need to do is clearing any
// brushes from the current mode, if any.
if (brush.mode !== "None") {
pc.brushReset();
}
// Next, we need to 'uninstall' the current brushMode.
brush.modes[brush.mode].uninstall(pc);
// Finally, we can install the requested one.
brush.mode = mode;
brush.modes[brush.mode].install();
if (mode === "None") {
delete pc.brushPredicate;
} else {
pc.brushPredicate = brushPredicate;
}
}
return pc;
};
// brush mode: 1D-Axes
(function() {
var brushes = {};
function is_brushed(p) {
return !brushes[p].empty();
}
// data within extents
function selected() {
var actives = __.dimensions.filter(is_brushed),
extents = actives.map(function(p) { return brushes[p].extent(); });
// We don't want to return the full data set when there are no axes brushed.
// Actually, when there are no axes brushed, by definition, no items are
// selected. So, let's avoid the filtering and just return false.
//if (actives.length === 0) return false;
// Resolves broken examples for now. They expect to get the full dataset back from empty brushes
if (actives.length === 0) return __.data;
// test if within range
var within = {
"date": function(d,p,dimension) {
return extents[dimension][0] <= d[p] && d[p] <= extents[dimension][1]
},
"number": function(d,p,dimension) {
return extents[dimension][0] <= d[p] && d[p] <= extents[dimension][1]
},
"string": function(d,p,dimension) {
return extents[dimension][0] <= yscale[p](d[p]) && yscale[p](d[p]) <= extents[dimension][1]
}
};
return __.data
.filter(function(d) {
switch(brush.predicate) {
case "AND":
return actives.every(function(p, dimension) {
return within[__.types[p]](d,p,dimension);
});
case "OR":
return actives.some(function(p, dimension) {
return within[__.types[p]](d,p,dimension);
});
default:
throw "Unknown brush predicate " + __.brushPredicate;
}
});
};
function brushExtents() {
var extents = {};
__.dimensions.forEach(function(d) {
var brush = brushes[d];
if (brush !== undefined && !brush.empty()) {
var extent = brush.extent();
extent.sort(d3.ascending);
extents[d] = extent;
}
});
return extents;
}
function brushFor(axis) {
var brush = d3.svg.brush();
brush
.y(yscale[axis])
.on("brushstart", function() { d3.event.sourceEvent.stopPropagation() })
.on("brush", function() {
brushUpdated(selected());
})
.on("brushend", function() {
events.brushend.call(pc, __.brushed);
});
brushes[axis] = brush;
return brush;
}
function brushReset(dimension) {
__.brushed = false;
if (g) {
g.selectAll('.brush')
.each(function(d) {
d3.select(this).call(
brushes[d].clear()
);
});
pc.renderBrushed();
}
return this;
};
function install() {