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dnaism.v1.js
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dnaism.v1.js
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(function(exports){
var VERSION = "0.3.9",
dnaism;
if (typeof window === 'undefined') { // node
dnaism = exports;
} else {
dnaism = exports.dnaism = {};
}
dnaism.version = VERSION;
var dnaism_id = 0;
function dnaism_identity(d) { return d; }
dnaism.context = function() {
var context = new dnaism_context,
step = 1e4, // 10k bp
size = 1440, // 10k * 1440 pixes = 14M bases
chrm, // chrm
start, stop, // start/stop of the current region
event = d3.dispatch("focus", "change", "prepare", "beforechange"),
scale = context.scale = d3.scale.linear().range([0, size]),
focus;
function update() {
scale.domain([start, stop]);
return context;
}
context.chrm = function(_) {
if (!arguments.length) return chrm;
chrm = _;
return update();
};
context.start = function(_) {
if (!arguments.length) return start;
start = +_;
return update();
};
context.stop = function(_) {
if (!arguments.length) return stop;
stop = +_;
return update();
};
// Set or get the step interval in milliseconds.
// Defaults to ten seconds.
context.step = function(_) {
if (!arguments.length) return step;
step = +_;
return update();
};
// Defaults to 1440 pixels (14M bases).
context.size = function(_) {
if (!arguments.length) return size;
scale.range([0, size = +_]);
return update();
};
// Sets the focus to the specified index, and dispatches a "focus" event.
context.focus = function(i) {
event.focus.call(context, focus = i);
return context;
};
// Add, remove or get listeners for events.
context.on = function(type, listener) {
if (arguments.length < 2) return event.on(type); // return the listener for that event
event.on(type, listener); // set the listener for that event
// Notify the listener of the current start and stop time, as appropriate.
// This way, metrics can make requests for data immediately,
// and likewise the axis can display itself synchronously.
if (listener !== null) {
if (/^focus(\.|$)/.test(type)) listener.call(context, focus);
if (/^change(\.|$)/.test(type)) listener.call(context, start, stop);
if (/^prepare(\.|$)/.test(type)) listener.call(context, start, stop);
if (/^beforechange(\.|$)/.test(type)) listener.call(context, start, stop);
}
return context;
};
return update();
};
function dnaism_context() {}
var dnaism_contextPrototype = dnaism.context.prototype = dnaism_context.prototype;
function dnaism_metric(context) {
if (!(context instanceof dnaism_context)) throw new Error("invalid context");
this.context = context;
}
var dnaism_metricPrototype = dnaism_metric.prototype;
dnaism.metric = dnaism_metric;
dnaism_metricPrototype.valueAt = function() {
return NaN;
};
dnaism_metricPrototype.alias = function(name) {
this.toString = function() { return name; };
return this;
};
dnaism_metricPrototype.extent = function() {
var i = 0,
n = this.context.size(),
value,
min = Infinity,
max = -Infinity;
while (++i < n) {
value = this.valueAt(i);
if (value < min) min = value;
if (value > max) max = value;
}
return [min, max];
};
dnaism_metricPrototype.on = function(type, listener) {
return arguments.length < 2 ? null : this;
};
dnaism_metricPrototype.shift = function() {
return this;
};
dnaism_metricPrototype.on = function() {
return arguments.length < 2 ? null : this;
};
dnaism_contextPrototype.metric = function(request, name) {
var context = this,
metric = new dnaism_metric(context),
id = ".metric-" + ++dnaism_id,
start = -Infinity,
stop,
step = context.step(),
size = context.size(),
chrm = context.chrm(),
values = [],
event = d3.dispatch("change"),
listening = 0,
fetching;
// Prefetch new data into a temporary array.
function prepare(start1, stop) {
var steps = Math.min(size, Math.round((start1 - start) / step));
if (!steps || fetching) return; // already fetched, or fetching!
fetching = true;
/*
steps = Math.min(size, steps + dnaism_metricOverlap);
var start0 = stop - steps * step;
*/
console.log("Requesting ..." + chrm + ":" + start1 + "," + stop);
request(start1, stop, chrm, step, function(error, data) {
fetching = false;
if (error) return console.warn(error);
var i = isFinite(start) ? Math.round((start1 - start) / step) : 0;
for (var j = 0, m = data.length; j < m; ++j) values[j + i] = data[j];
event.change.call(metric, start, stop);
});
}
// When the context changes, switch to the new data, ready-or-not!
function beforechange(start1, stop1) {
if (!isFinite(start)) start = start1;
values.splice(0, Math.max(0, Math.min(size, Math.round((start1 - start) / step))));
start = start1;
stop = stop1;
}
//
metric.valueAt = function(i) {
return values[i];
};
// drd
metric.values = function() {
return values;
};
//
metric.shift = function(offset) {
return context.metric(dnaism_metricShift(request, +offset));
};
//
metric.on = function(type, listener) {
if (!arguments.length) return event.on(type);
// If there are no listeners, then stop listening to the context,
// and avoid unnecessary fetches.
if (listener == null) {
if (event.on(type) != null && --listening == 0) {
context.on("prepare" + id, null).on("beforechange" + id, null);
}
} else {
if (event.on(type) == null && ++listening == 1) {
context.on("prepare" + id, prepare).on("beforechange" + id, beforechange);
}
}
event.on(type, listener);
// Notify the listener of the current start and stop time, as appropriate.
// This way, charts can display synchronous metrics immediately.
if (listener != null) {
if (/^change(\.|$)/.test(type)) listener.call(context, start, stop);
}
return metric;
};
//
if (arguments.length > 1) metric.toString = function() {
return name;
};
return metric;
};
// Number of metric to refetch each period, in case of lag.
var dnaism_metricOverlap = 6;
// Wraps the specified request implementation, and shifts time by the given offset.
function dnaism_metricShift(request, offset) {
return function(start, stop, step, callback) {
request(+start + offset, +stop + offset, chrm, step, callback);
};
}
dnaism_contextPrototype.horizon = function() {
var context = this,
mode = "offset",
buffer = document.createElement("canvas"),
width = buffer.width = context.size(),
height = buffer.height = 30,
scale = d3.scale.linear().interpolate(d3.interpolateRound),
metric = dnaism_identity,
extent = null,
title = dnaism_identity,
format = d3.format(".2s"),
colors = ["#08519c","#3182bd","#6baed6","#bdd7e7","#bae4b3","#74c476","#31a354","#006d2c"];
function horizon(selection) {
selection
.on("mousemove.horizon", function() { context.focus(Math.round(d3.mouse(this)[0])); })
.on("mouseout.horizon", function() { context.focus(null); });
selection.append("canvas")
.attr("width", width)
.attr("height", height);
selection.append("span")
.attr("class", "title")
.text(title);
selection.append("span")
.attr("class", "value");
selection.each(function(d, i) {
var that = this,
id = ++dnaism_id,
metric_ = typeof metric === "function" ? metric.call(that, d, i) : metric,
colors_ = typeof colors === "function" ? colors.call(that, d, i) : colors,
extent_ = typeof extent === "function" ? extent.call(that, d, i) : extent,
start = -Infinity,
step = context.step(),
canvas = d3.select(that).select("canvas"),
span = d3.select(that).select(".value"),
max_,
m = colors_.length >> 1,
ready;
canvas.datum({id: id, metric: metric_});
canvas = canvas.node().getContext("2d");
function change(start1, stop) {
canvas.save();
// compute the new extent and ready flag
var extent = metric_.extent();
ready = extent.every(isFinite);
if (extent_ != null) extent = extent_;
// if this is an update (with no extent change), copy old values!
var i0 = 0, max = Math.max(-extent[0], extent[1]);
if (this === context) {
if (max == max_) {
i0 = width - dnaism_metricOverlap;
var dx = (start1 - start) / step;
if (dx < width) {
var canvas0 = buffer.getContext("2d");
canvas0.clearRect(0, 0, width, height);
canvas0.drawImage(canvas.canvas, dx, 0, width - dx, height, 0, 0, width - dx, height);
canvas.clearRect(0, 0, width, height);
canvas.drawImage(canvas0.canvas, 0, 0);
}
}
start = start1;
}
// update the domain
scale.domain([0, max_ = max]);
// clear for the new data
canvas.clearRect(i0, 0, width - i0, height);
// record whether there are negative values to display
var negative;
// positive bands
for (var j = 0; j < m; ++j) {
canvas.fillStyle = colors_[m + j];
// Adjust the range based on the current band index.
var y0 = (j - m + 1) * height;
scale.range([m * height + y0, y0]);
y0 = scale(0);
for (var i = i0, n = width, y1; i < n; ++i) {
y1 = metric_.valueAt(i);
if (y1 <= 0) { negative = true; continue; }
if (y1 === undefined) continue;
canvas.fillRect(i, y1 = scale(y1), 1, y0 - y1);
}
}
if (negative) {
// enable offset mode
if (mode === "offset") {
canvas.translate(0, height);
canvas.scale(1, -1);
}
// negative bands
for (var j = 0; j < m; ++j) {
canvas.fillStyle = colors_[m - 1 - j];
// Adjust the range based on the current band index.
var y0 = (j - m + 1) * height;
scale.range([m * height + y0, y0]);
y0 = scale(0);
for (var i = i0, n = width, y1; i < n; ++i) {
y1 = metric_.valueAt(i);
if (y1 >= 0) continue;
canvas.fillRect(i, scale(-y1), 1, y0 - scale(-y1));
}
}
}
canvas.restore();
}
function focus(i) {
if (i == null) i = width - 1;
var value = metric_.valueAt(i);
span.datum(value).text(isNaN(value) ? null : format);
if (i === width - 1)
span.datum(value).text(null); // Do not show last value when not in focus
}
// Update the chart when the context changes.
context.on("change.horizon-" + id, change);
context.on("focus.horizon-" + id, focus);
// Display the first metric change immediately,
// but defer subsequent updates to the canvas change.
// Note that someone still needs to listen to the metric,
// so that it continues to update automatically.
metric_.on("change.horizon-" + id, function(start, stop) {
change(start, stop), focus();
if (ready) metric_.on("change.horizon-" + id, dnaism_identity);
});
});
}
horizon.remove = function(selection) {
selection
.on("mousemove.horizon", null)
.on("mouseout.horizon", null);
selection.selectAll("canvas")
.each(remove)
.remove();
selection.selectAll(".title,.value")
.remove();
function remove(d) {
d.metric.on("change.horizon-" + d.id, null);
context.on("change.horizon-" + d.id, null);
context.on("focus.horizon-" + d.id, null);
}
};
horizon.mode = function(_) {
if (!arguments.length) return mode;
mode = _ + "";
return horizon;
};
horizon.height = function(_) {
if (!arguments.length) return height;
buffer.height = height = +_;
return horizon;
};
horizon.metric = function(_) {
if (!arguments.length) return metric;
metric = _;
return horizon;
};
horizon.scale = function(_) {
if (!arguments.length) return scale;
scale = _;
return horizon;
};
horizon.extent = function(_) {
if (!arguments.length) return extent;
extent = _;
return horizon;
};
horizon.title = function(_) {
if (!arguments.length) return title;
title = _;
return horizon;
};
horizon.format = function(_) {
if (!arguments.length) return format;
format = _;
return horizon;
};
horizon.colors = function(_) {
if (!arguments.length) return colors;
colors = _;
return horizon;
};
return horizon;
};
// ... { d3.select(this).call(context.axis().ticks(12).orient(d)); });
dnaism_contextPrototype.axis = function() {
var context = this,
scale = context.scale,
axis_ = d3.svg.axis().scale(scale);
//var format = d3.format("s");
var format = function(d) { return context.chrm() + ":" + d3.format("s")(d); };
var format_log = function(d) { return context.chrm() + ":" + Math.round(d); };
function axis(selection) {
var id = ++dnaism_id,
tick;
var g = selection.append("svg")
.datum({id: id})
.attr("width", context.size())
.attr("height", Math.max(28, -axis.tickSize()))
.append("g")
.attr("transform", "translate(0," + (axis_.orient() === "top" ? 27 : 4) + ")")
.call(axis_);
context.on("change.axis-" + id, function() {
g.call(axis_);
if (!tick) tick = d3.select(g.node().appendChild(g.selectAll("text").node().cloneNode(true)))
.style("display", "none")
.text(null);
});
context.on("focus.axis-" + id, function(i) {
if (tick) {
if (i == null) {
tick.style("display", "none");
g.selectAll("text").style("fill-opacity", null);
} else {
//console.log(format_log(scale.invert(i)));
tick.style("display", null).attr("x", i).text(format(scale.invert(i)));
var dx = tick.node().getComputedTextLength() + 6;
g.selectAll("text").style("fill-opacity", function(d) { return Math.abs(scale(d) - i) < dx ? 0 : 1; });
}
}
});
}
axis.remove = function(selection) {
selection.selectAll("svg")
.each(remove)
.remove();
function remove(d) {
context.on("change.axis-" + d.id, null);
context.on("focus.axis-" + d.id, null);
}
};
return d3.rebind(axis, axis_,
"orient",
"ticks",
"tickSubdivide",
"tickSize",
"tickPadding",
"tickFormat").tickFormat(format);
};
dnaism_contextPrototype.rule = function() {
var context = this,
metric = dnaism_identity;
function rule(selection) {
var id = ++dnaism_id;
var line = selection.append("div")
.datum({id: id})
.attr("class", "line")
.call(dnaism_ruleStyle);
selection.each(function(d, i) {
var that = this,
id = ++dnaism_id,
metric_ = typeof metric === "function" ? metric.call(that, d, i) : metric;
if (!metric_) return;
function change(start, stop) {
var values = [];
for (var i = 0, n = context.size(); i < n; ++i) {
if (metric_.valueAt(i)) {
values.push(i);
}
}
var lines = selection.selectAll(".metric").data(values);
lines.exit().remove();
lines.enter().append("div").attr("class", "metric line").call(dnaism_ruleStyle);
lines.style("left", dnaism_ruleLeft);
}
context.on("change.rule-" + id, change);
metric_.on("change.rule-" + id, change);
});
context.on("focus.rule-" + id, function(i) {
line.datum(i)
.style("display", i == null ? "none" : null)
.style("left", i == null ? null : dnaism_ruleLeft);
});
}
rule.remove = function(selection) {
selection.selectAll(".line")
.each(remove)
.remove();
function remove(d) {
context.on("focus.rule-" + d.id, null);
}
};
rule.metric = function(_) {
if (!arguments.length) return metric;
metric = _;
return rule;
};
return rule;
};
function dnaism_ruleStyle(line) {
line
.style("position", "absolute")
.style("top", 0)
.style("bottom", 0)
.style("width", "1px")
.style("pointer-events", "none");
}
function dnaism_ruleLeft(i) {
return i + "px";
}
// vim: ts=4 expandtab:
/* The simplets source, a bed file */
dnaism_contextPrototype.bedfile = function() {
var source = {},
context = this,
compute_average;
compute_average = function(arr) {
var sum = 0, i;
for (i=0; i<arr.length; i++)
sum = sum + arr[i];
return +((sum/arr.length).toFixed(2));
};
source.metric = function(file_name) {
return context.metric(function(start, stop, chrm, step, callback) {
d3.text(file_name, function(contents) {
var final_data_points = [],
size = context.size(),
interval_size = (stop-start)/size,
int_mark = start + interval_size,
sum = 0,
int_vals = [],
_n_plus;
d3.tsv.parseRows(contents, function(a_row) {
var _chrm = a_row[0],
coor = +a_row[1],
value = +a_row[3];
if (chrm === _chrm && coor < int_mark) {
int_vals.push(value);
}
else {
if (coor < int_mark + interval_size) {
final_data_points.push(compute_average(int_vals));
int_mark = int_mark + interval_size;
}
else {
_n_plus = ~~((coor - int_mark) / interval_size);
int_mark += (interval_size * _n_plus);
while (_n_plus--)
final_data_points.push(0);
}
int_vals = [value];
}
return null;
});
// Data points ready to send back to dnaism engine
callback(null, final_data_points.slice(-context.size()));
});
}, file_name);
};
return source;
};
// Source for bedserver: https://github.com/drio/bedserver
dnaism_contextPrototype.bedserver = function(host) {
if (!arguments.length) host = "";
var source = {},
context = this;
source.metric = function(project, sample) {
return context.metric(function(start, stop, chrm, step, callback) {
var url = host + "/bedserver/api/v1.0/samples/"
+ project + "/" + sample
+ "?start=" + start
+ "&stop=" + stop
+ "&chrm=" + context.chrm()
+ "&size=" + context.size()
+ "&step=" + step;
console.log("bedserver; url= " + url);
d3.json(url, function(data) {
if (!data) return callback(new Error("unable to load data"));
callback(null, data);
});
}, project + ":" + sample);
};
// Returns the bedserver host.
source.toString = function() {
return host;
};
return source;
};
})(this);