Revert "add d3js based trace visualizer as gantt chart"

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Trace visualizer is a tool for representation of a tracing data as a Gantt diagram.
# Quick start
For now this tool is not integrate into clickhouse and require a lot of manual adjustments.
```bash
cd utils/trace-visualizer
python3 -m http.server
```
Open [localhost](http://localhost:8000). It will show an example of data. To show your tracing data you have to put it in JSON format near `index.html` and change call to `fetchData()` function at the bottom of `index.html`. (Do not forget to disable browser caching while changing it).
# Visualizing query trace
First of all [opentelemetry_span_log](https://clickhouse.com/docs/en/operations/opentelemetry/) system table must be enabled to save query traces. Then run a query you want to trace with a setting:
```sql
set opentelemetry_start_trace_probability=1;
SELECT 1;
```
To find out `trace_id` of a query run the following command:
```sql
SELECT DISTINCT trace_id FROM system.opentelemetry_span_log ORDER BY query_start_time DESC;
```
To obtain JSON data suitable for visualizing run:
```sql
SELECT tuple (parent_span_id, attribute['clickhouse.thread_id'] || attribute['thread_number'] as thread_id)::Tuple(parent_span_id UInt64, thread_id String) as group, operation_name, start_time_us, finish_time_us, sipHash64(operation_name) as color, attribute
from system.opentelemetry_span_log
WHERE trace_id = 'your-trace-id'
ORDER BY group ASC
FORMAT JSON SETTINGS output_format_json_named_tuples_as_objects = 1;
```
# Dependencies
1. [D3js](https://github.com/d3/d3) (v4).
2. [Tooltips for D3](https://github.com/caged/d3-tip).
3. [jquery](https://github.com/jquery/jquery).
4. [Bootstrap](https://github.com/twbs/bootstrap).

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/*
* d3-gantt.css by @serxa
*/
.chart {
font-family: Arial, sans-serif;
font-size: 12px;
}
rect.zoom-panel {
/*cursor: ew-resize;*/
fill: none;
pointer-events: all;
}
.axis path,.axis line {
fill: none;
stroke: #000;
shape-rendering: crispEdges;
}
.axis.y {
font-size: 16px;
cursor: ns-resize;
}
.axis.x {
font-size: 16px;
}
#ruler {
text-anchor: middle;
alignment-baseline: before-edge;
font-size: 16px;
font-family: sans-serif;
pointer-events: none;
}
.d3-tip {
line-height: 1;
font-weight: bold;
padding: 12px;
background: rgba(0, 0, 0, 0.8);
color: #fff;
border-radius: 2px;
}
.d3-tip pre {
font-weight: bold;
padding: 12px;
background: rgba(0, 0, 0, 0);
color: #fff;
border: 0px;
}
/* Style northward tooltips differently */
.d3-tip.n:after {
margin: -1px 0 0 0;
top: 100%;
left: 0;
}
/* for arrowhead marker */
#arrow {
stroke-width:1;
stroke-dasharray:0;
}
.bar:hover {
stroke-width: 1px;
stroke: black;
}
#errmsg {
width: 95vw;
margin: 0 auto;
padding: 10px;
}

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Trace Gantt</title>
<link rel="stylesheet" href="css/bootstrap.min.css">
<link rel="stylesheet" href="css/d3-gantt.css">
</head>
<body>
<script language="javascript" type="text/javascript" src="js/jquery.min.js"></script>
<script language="javascript" type="text/javascript" src="js/bootstrap.min.js"></script>
<script language="javascript" type="text/javascript" src="js/d3.v4.min.js"></script>
<script language="javascript" type="text/javascript" src="js/d3-tip-0.8.0-alpha.1.js"></script>
<script language="javascript" type="text/javascript" src="js/d3-gantt.js"></script>
<div id="placeholder" class="chart-placeholder"></div>
</body>
</html>
<script language="javascript">
var example_json = [
{ t1: 100, t2: 200, band: "band1", color: "#888", text: "text1" },
{ t1: 300, t2: 400, band: "band2", color: "#ff8", text: "text2" },
{ t1: 100, t2: 400, band: "band3", color: "#888", text: "some very long text with a lot of letters in it" },
{ t1: 300, t2: 400, band: "band1", color: "#8ff", text: "some_very_long_identifier_with_a_lot_of_letters_in_it" },
{ t1: 500, t2: 800, band: "band2", color: "#f8f", text: "test\nif\nnew\nline\nworks\nhere?" }
];
var chart = d3.gantt()
.height(window.innerHeight - $("#placeholder")[0].getBoundingClientRect().y - window.scrollY)
.selector("#placeholder");
var data = null;
// Error message popup
$("<div id='errmsg'></div>").css({
position: "absolute",
display: "none",
border: "1px solid #faa",
padding: "2px",
"background-color": "#fcc",
opacity: 0.80
}).appendTo("body");
function fetchData(dataurl, parser = x => x) {
function onDataReceived(json, textStatus, xhr) {
$("#errmsg").hide();
data = parser(json);
chart(data);
}
function onDataError(xhr, error) {
console.log(arguments);
$("#errmsg").text("Fetch data error: " + error + (xhr.status == 200? xhr.responseText: ""))
.css({bottom: "5px", left: "25%", width: "50%"})
.fadeIn(200);
}
if (dataurl) {
$.ajax({
url: dataurl,
type: "GET",
dataType: "json",
success: function (json, textStatus, xhr) { onDataReceived(json, textStatus, xhr); },
error: onDataError
});
} else {
onDataReceived(example_json, "textStatus", "xhr");
}
}
function parseClickHouseTrace(json) {
let min_time_us = Number.MAX_VALUE;
for (let i = 0; i < json.data.length; i++) {
let span = json.data[i];
min_time_us = Math.min(min_time_us, +span.start_time_us);
}
let max_time_ms = 0;
function convertTime(us) {
let value = (us - min_time_us) / 1000;
max_time_ms = Math.max(max_time_ms, value);
return value;
}
function strHash(str) {
var hash = 0;
if (str.length === 0)
return hash;
for (let i = 0; i < str.length; i++) {
hash = ((hash << 5) - hash) + str.charCodeAt(i);
hash |= 0; // Convert to 32bit integer
}
if (hash < 0)
hash = -hash;
return hash;
}
let result = [];
for (let i = 0; i < json.data.length; i++) {
let span = json.data[i];
result.push({
t1: convertTime(+span.start_time_us),
t2: convertTime(+span.finish_time_us),
band: Object.values(span.group).join(' '),
color: d3.interpolateRainbow((strHash(span.color) % 256) / 256),
text: span.operation_name
});
}
chart.timeDomain([0, max_time_ms]);
return result;
}
fetchData(); // do not fetch, just draw example_json w/o parsing
//fetchData("your-traces.json" , parseClickHouseTrace);
</script>

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/*
* d3-gantt.js by @serxa
* Based on https://github.com/ydb-platform/ydb/blob/stable-22-2/library/cpp/lwtrace/mon/static/js/d3-gantt.js
*/
d3.gantt = function() {
function gantt(input_data) {
data = input_data;
initAxis();
// create svg element
svg = d3.select(selector)
.append("svg")
.attr("class", "chart")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom)
;
// create arrowhead marker
defs = svg.append("defs");
defs.append("marker")
.attr("id", "arrow")
.attr("viewBox", "0 -5 10 10")
.attr("refX", 5)
.attr("refY", 0)
.attr("markerWidth", 4)
.attr("markerHeight", 4)
.attr("orient", "auto")
.append("path")
.attr("d", "M0,-5L10,0L0,5")
.attr("class","arrowHead")
;
zoom = d3.zoom()
.scaleExtent([0.1, 1000])
//.translateExtent([0, 0], [1000,0])
.on("zoom", function() {
if (tipShown != null) {
tip.hide(tipShown);
}
var tr = d3.event.transform;
xZoomed = tr.rescaleX(x);
svg.select("g.x.axis").call(xAxis.scale(xZoomed));
var dy = d3.event.sourceEvent.screenY - zoom.startScreenY;
var newScrollTop = documentBodyScrollTop() - dy;
window.scrollTo(documentBodyScrollLeft(), newScrollTop);
documentBodyScrollTop(newScrollTop);
zoom.startScreenY = d3.event.sourceEvent.screenY;
zoomContainer1.attr("transform", "translate(" + tr.x + ",0) scale(" + tr.k + ",1)");
zoomContainer2.attr("transform", "translate(" + tr.x + ",0) scale(" + tr.k + ",1)");
render();
})
.on("start", function() {
zoom.startScreenY = d3.event.sourceEvent.screenY;
})
.on("end", function() {
})
;
svgChartContainer = svg.append('g')
.attr("transform", "translate(" + margin.left + ", " + margin.top + ")")
;
svgChart = svgChartContainer.append("svg")
.attr("top", 0)
.attr("left", 0)
.attr("width", width)
.attr("height", height)
.attr("viewBox", "0 0 " + width + " " + height)
;
zoomContainer1 = svgChart.append("g");
zoomPanel = svgChart.append("rect")
.attr("class", "zoom-panel")
.attr("width", width)
.attr("height", height)
.call(zoom)
;
zoomContainer2 = svgChart.append("g");
bandsSvg = zoomContainer2.append("g");
// tooltips for bands
var maxTipHeight = 130;
const tipDirection = d => y(d.band) - maxTipHeight < documentBodyScrollTop()? 's': 'n';
tip = d3.tip()
.attr("class", "d3-tip")
.offset(function(d) {
// compute x to return tip in chart region
var t0 = (d.t1 + d.t2) / 2;
var t1 = Math.min(Math.max(t0, xZoomed.invert(0)), xZoomed.invert(width));
var dir = tipDirection(d);
return [dir === 'n'? -10 : 10, xZoomed(t1) - xZoomed(t0)];
})
.direction(tipDirection)
.html(d => "<pre>" + d.text + "</pre>")
;
bandsSvg.call(tip);
render();
// container for non-zoomable elements
fixedContainer = svg.append("g")
.attr("transform", "translate(" + margin.left + ", " + margin.top + ")")
;
// create x axis
fixedContainer.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0, " + (height - margin.top - margin.bottom) + ")")
.transition()
.call(xAxis)
;
// create y axis
fixedContainer.append("g")
.attr("class", "y axis")
.transition()
.call(yAxis)
;
// make y axis ticks draggable
var ytickdrag = d3.drag()
.on("drag", function(d) {
var ypos = d3.event.y - margin.top;
var index = Math.floor((ypos / y.step()));
index = Math.min(Math.max(index, 0), this.initDomain.length - 1);
if (index != this.curIndex) {
var newDomain = [];
for (var i = 0; i < this.initDomain.length; ++i) {
newDomain.push(this.initDomain[i]);
}
newDomain.splice(this.initIndex, 1);
newDomain.splice(index, 0, this.initDomain[this.initIndex]);
this.curIndex = index;
this.curDomain = newDomain;
y.domain(newDomain);
// rearange y scale and axis
svg.select("g.y.axis").transition().call(yAxis);
// rearange other stuff
render(-1, true);
}
})
.on("start", function(d) {
var ypos = d3.event.y - margin.top;
this.initIndex = Math.floor((ypos / y.step()));
this.initDomain = y.domain();
})
.on("end", function(d) {
svg.select("g.y.axis").call(yAxis);
})
;
svg.selectAll("g.y.axis .tick")
.call(ytickdrag)
;
// right margin
var rmargin = fixedContainer.append("g")
.attr("id", "right-margin")
.attr("transform", "translate(" + width + ", 0)")
;
rmargin.append("rect")
.attr("x", 0)
.attr("y", 0)
.attr("width", 1)
.attr("height", height - margin.top - margin.bottom)
;
// top margin
var tmargin = fixedContainer.append("g")
.attr("id", "top-margin")
.attr("transform", "translate(0, 0)")
;
tmargin.append("rect")
.attr("x", 0)
.attr("y", 0)
.attr("width", width)
.attr("height", 1)
;
// ruler
ruler = fixedContainer.append("g")
.attr("id", "ruler")
.attr("transform", "translate(0, 0)")
;
ruler.append("rect")
.attr("id", "ruler-line")
.attr("x", 0)
.attr("y", 0)
.attr("width", "1")
.attr("height", height - margin.top - margin.bottom + 8)
;
ruler.append("rect")
.attr("id", "bgrect")
.attr("x", 0)
.attr("y", 0)
.attr("width", 0)
.attr("height", 0)
.style("fill", "white")
;
ruler.append("text")
.attr("x", 0)
.attr("y", height - margin.top - margin.bottom + 16)
.attr("dy", "0.71em")
.text("0")
;
svg.on('mousemove', function() {
positionRuler(d3.event.pageX);
});
// scroll handling
window.onscroll = function myFunction() {
documentBodyScrollLeft(document.body.scrollLeft);
documentBodyScrollTop(document.body.scrollTop);
var scroll = scrollParams();
svgChartContainer
.attr("transform", "translate(" + margin.left
+ ", " + (margin.top + scroll.y1) + ")");
svgChart
.attr("viewBox", "0 " + scroll.y1 + " " + width + " " + scroll.h)
.attr("height", scroll.h);
tmargin
.attr("transform", "translate(0," + scroll.y1 + ")");
fixedContainer.select(".x.axis")
.attr("transform", "translate(0," + scroll.y2 + ")");
rmargin.select("rect")
.attr("y", scroll.y1)
.attr("height", scroll.h);
ruler.select("#ruler-line")
.attr("y", scroll.y1)
.attr("height", scroll.h);
positionRuler();
}
// render axis
svg.select("g.x.axis").call(xAxis);
svg.select("g.y.axis").call(yAxis);
// update to initiale state
window.onscroll(0);
return gantt;
}
// private:
var keyFunction = function(d) {
return d.t1.toString() + d.t2.toString() + d.band.toString();
}
var bandTransform = function(d) {
return "translate(" + x(d.t1) + "," + y(d.band) + ")";
}
var xPixel = function(d) {
return xZoomed.invert(1) - xZoomed.invert(0);
}
var render = function(t0, smooth) {
// Save/restore last t0 value
if (!arguments.length || t0 == -1) {
t0 = render.t0;
}
render.t0 = t0;
smooth = smooth || false;
// Create rectangles for bands
bands = bandsSvg.selectAll("rect.bar")
.data(data, keyFunction);
bands.exit().remove();
bands.enter().append("rect")
.attr("class", "bar")
.attr("vector-effect", "non-scaling-stroke")
.style("fill", d => d.color)
.on('click', function(d) {
if (tipShown != d) {
tipShown = d;
tip.show(d);
} else {
tipShown = null;
tip.hide(d);
}
})
.merge(bands)
.transition().duration(smooth? 250: 0)
.attr("y", 0)
.attr("transform", bandTransform)
.attr("height", y.bandwidth())
.attr("width", d => Math.max(1*xPixel(), x(d.t2) - x(d.t1)))
;
var emptyMarker = bandsSvg.selectAll("text")
.data(data.length == 0? ["no data to show"]: []);
emptyMarker.exit().remove();
emptyMarker.enter().append("text")
.text(d => d)
;
}
function initAxis() {
x = d3.scaleLinear()
.domain([timeDomainStart, timeDomainEnd])
.range([0, width])
//.clamp(true); // dosn't work with zoom/pan
xZoomed = x;
y = d3.scaleBand()
.domain(Object.values(data).map(d => d.band).sort())
.rangeRound([0, height - margin.top - margin.bottom])
.padding(0.5);
xAxis = d3.axisBottom()
.scale(x)
//.tickSubdivide(true)
.tickSize(8)
.tickPadding(8);
yAxis = d3.axisLeft()
.scale(y)
.tickSize(0);
}
// slow function wrapper
var documentBodyScrollLeft = function(value) {
if (!arguments.length) {
if (documentBodyScrollLeft.value === undefined) {
documentBodyScrollLeft.value = document.body.scrollLeft;
}
return documentBodyScrollLeft.value;
} else {
documentBodyScrollLeft.value = value;
}
}
// slow function wrapper
var documentBodyScrollTop = function(value) {
if (!arguments.length) {
if (!documentBodyScrollTop.value === undefined) {
documentBodyScrollTop.value = document.body.scrollTop;
}
return documentBodyScrollTop.value;
} else {
documentBodyScrollTop.value = value;
}
}
var scrollParams = function() {
var y1 = documentBodyScrollTop();
var y2 = y1 + window.innerHeight - margin.footer;
y2 = Math.min(y2, height - margin.top - margin.bottom);
var h = y2 - y1;
return {
y1: y1,
y2: y2,
h: h
};
}
var posTextFormat = d3.format(".1f");
var positionRuler = function(pageX) {
if (!arguments.length) {
pageX = positionRuler.pageX || 0;
} else {
positionRuler.pageX = pageX;
}
// x-coordinate
if (!positionRuler.svgLeft) {
positionRuler.svgLeft = svg.node().getBoundingClientRect().x;
}
var xpos = pageX - margin.left + 1 - positionRuler.svgLeft;
var tpos = xZoomed.invert(xpos);
tpos = Math.min(Math.max(tpos, xZoomed.invert(0)), xZoomed.invert(width));
ruler.attr("transform", "translate(" + xZoomed(tpos) + ", 0)");
var posText = posTextFormat(tpos);
// scroll-related
var scroll = scrollParams();
var text = ruler.select("text")
.attr("y", scroll.y2 + 16)
;
// getBBox() is very slow, so compute symbol width once
var xpadding = 5;
var ypadding = 5;
if (!positionRuler.bbox) {
positionRuler.bbox = text.node().getBBox();
}
text.text(posText);
var textWidth = 10 * posText.length;
ruler.select("#bgrect")
.attr("x", -textWidth/2 - xpadding)
.attr("y", positionRuler.bbox.y - ypadding)
.attr("width", textWidth + (xpadding*2))
.attr("height", positionRuler.bbox.height + (ypadding*2))
;
render(tpos);
}
// public:
gantt.width = function(value) {
if (!arguments.length)
return width;
width = +value;
return gantt;
}
gantt.height = function(value) {
if (!arguments.length)
return height;
height = +value;
return gantt;
}
gantt.selector = function(value) {
if (!arguments.length)
return selector;
selector = value;
return gantt;
}
gantt.timeDomain = function(value) {
if (!arguments.length)
return [timeDomainStart, timeDomainEnd];
timeDomainStart = value[0];
timeDomainEnd = value[1];
return gantt;
}
gantt.data = function() {
return data;
}
// constructor
// Config
var margin = { top: 20, right: 40, bottom: 20, left: 200, footer: 100 },
height = document.body.clientHeight - margin.top - margin.bottom - 5,
width = document.body.clientWidth - margin.right - margin.left - 5,
selector = 'body',
timeDomainStart = 0,
timeDomainEnd = 1000,
scales = {};
;
// View
var x = null,
xZoomed = null,
y = null,
xAxis = null,
yAxis = null,
svg = null,
defs = null,
svgChartContainer = null,
svgChart = null,
zoomPanel = null,
zoomContainer1 = null,
zoomContainer2 = null,
fixedContainer = null,
zoom = null,
bandsSvg = null,
bands = null,
tip = null,
tipShown = null,
ruler = null
;
// Model
var data = null;
return gantt;
}

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/**
* d3.tip
* Copyright (c) 2013 Justin Palmer
*
* Tooltips for d3.js SVG visualizations
*/
// eslint-disable-next-line no-extra-semi
;(function(root, factory) {
if (typeof define === 'function' && define.amd) {
// AMD. Register as an anonymous module with d3 as a dependency.
define([
'd3-collection',
'd3-selection'
], factory)
} else if (typeof module === 'object' && module.exports) {
/* eslint-disable global-require */
// CommonJS
var d3Collection = require('d3-collection'),
d3Selection = require('d3-selection')
module.exports = factory(d3Collection, d3Selection)
/* eslint-enable global-require */
} else {
// Browser global.
var d3 = root.d3
// eslint-disable-next-line no-param-reassign
root.d3.tip = factory(d3, d3)
}
}(this, function(d3Collection, d3Selection) {
// Public - contructs a new tooltip
//
// Returns a tip
return function() {
var direction = d3TipDirection,
offset = d3TipOffset,
html = d3TipHTML,
rootElement = document.body,
node = initNode(),
svg = null,
point = null,
target = null
function tip(vis) {
svg = getSVGNode(vis)
if (!svg) return
point = svg.createSVGPoint()
rootElement.appendChild(node)
}
// Public - show the tooltip on the screen
//
// Returns a tip
tip.show = function() {
var args = Array.prototype.slice.call(arguments)
if (args[args.length - 1] instanceof SVGElement) target = args.pop()
var content = html.apply(this, args),
poffset = offset.apply(this, args),
dir = direction.apply(this, args),
nodel = getNodeEl(),
i = directions.length,
coords,
scrollTop = document.documentElement.scrollTop ||
rootElement.scrollTop,
scrollLeft = document.documentElement.scrollLeft ||
rootElement.scrollLeft
nodel.html(content)
.style('opacity', 1).style('pointer-events', 'all')
while (i--) nodel.classed(directions[i], false)
coords = directionCallbacks.get(dir).apply(this)
nodel.classed(dir, true)
.style('top', (coords.top + poffset[0]) + scrollTop + 'px')
.style('left', (coords.left + poffset[1]) + scrollLeft + 'px')
return tip
}
// Public - hide the tooltip
//
// Returns a tip
tip.hide = function() {
var nodel = getNodeEl()
nodel.style('opacity', 0).style('pointer-events', 'none')
return tip
}
// Public: Proxy attr calls to the d3 tip container.
// Sets or gets attribute value.
//
// n - name of the attribute
// v - value of the attribute
//
// Returns tip or attribute value
// eslint-disable-next-line no-unused-vars
tip.attr = function(n, v) {
if (arguments.length < 2 && typeof n === 'string') {
return getNodeEl().attr(n)
}
var args = Array.prototype.slice.call(arguments)
d3Selection.selection.prototype.attr.apply(getNodeEl(), args)
return tip
}
// Public: Proxy style calls to the d3 tip container.
// Sets or gets a style value.
//
// n - name of the property
// v - value of the property
//
// Returns tip or style property value
// eslint-disable-next-line no-unused-vars
tip.style = function(n, v) {
if (arguments.length < 2 && typeof n === 'string') {
return getNodeEl().style(n)
}
var args = Array.prototype.slice.call(arguments)
d3Selection.selection.prototype.style.apply(getNodeEl(), args)
return tip
}
// Public: Set or get the direction of the tooltip
//
// v - One of n(north), s(south), e(east), or w(west), nw(northwest),
// sw(southwest), ne(northeast) or se(southeast)
//
// Returns tip or direction
tip.direction = function(v) {
if (!arguments.length) return direction
direction = v == null ? v : functor(v)
return tip
}
// Public: Sets or gets the offset of the tip
//
// v - Array of [x, y] offset
//
// Returns offset or
tip.offset = function(v) {
if (!arguments.length) return offset
offset = v == null ? v : functor(v)
return tip
}
// Public: sets or gets the html value of the tooltip
//
// v - String value of the tip
//
// Returns html value or tip
tip.html = function(v) {
if (!arguments.length) return html
html = v == null ? v : functor(v)
return tip
}
// Public: sets or gets the root element anchor of the tooltip
//
// v - root element of the tooltip
//
// Returns root node of tip
tip.rootElement = function(v) {
if (!arguments.length) return rootElement
rootElement = v == null ? v : functor(v)
return tip
}
// Public: destroys the tooltip and removes it from the DOM
//
// Returns a tip
tip.destroy = function() {
if (node) {
getNodeEl().remove()
node = null
}
return tip
}
function d3TipDirection() { return 'n' }
function d3TipOffset() { return [0, 0] }
function d3TipHTML() { return ' ' }
var directionCallbacks = d3Collection.map({
n: directionNorth,
s: directionSouth,
e: directionEast,
w: directionWest,
nw: directionNorthWest,
ne: directionNorthEast,
sw: directionSouthWest,
se: directionSouthEast
}),
directions = directionCallbacks.keys()
function directionNorth() {
var bbox = getScreenBBox()
return {
top: bbox.n.y - node.offsetHeight,
left: bbox.n.x - node.offsetWidth / 2
}
}
function directionSouth() {
var bbox = getScreenBBox()
return {
top: bbox.s.y,
left: bbox.s.x - node.offsetWidth / 2
}
}
function directionEast() {
var bbox = getScreenBBox()
return {
top: bbox.e.y - node.offsetHeight / 2,
left: bbox.e.x
}
}
function directionWest() {
var bbox = getScreenBBox()
return {
top: bbox.w.y - node.offsetHeight / 2,
left: bbox.w.x - node.offsetWidth
}
}
function directionNorthWest() {
var bbox = getScreenBBox()
return {
top: bbox.nw.y - node.offsetHeight,
left: bbox.nw.x - node.offsetWidth
}
}
function directionNorthEast() {
var bbox = getScreenBBox()
return {
top: bbox.ne.y - node.offsetHeight,
left: bbox.ne.x
}
}
function directionSouthWest() {
var bbox = getScreenBBox()
return {
top: bbox.sw.y,
left: bbox.sw.x - node.offsetWidth
}
}
function directionSouthEast() {
var bbox = getScreenBBox()
return {
top: bbox.se.y,
left: bbox.se.x
}
}
function initNode() {
var div = d3Selection.select(document.createElement('div'))
div
.style('position', 'absolute')
.style('top', 0)
.style('opacity', 0)
.style('pointer-events', 'none')
.style('box-sizing', 'border-box')
return div.node()
}
function getSVGNode(element) {
var svgNode = element.node()
if (!svgNode) return null
if (svgNode.tagName.toLowerCase() === 'svg') return svgNode
return svgNode.ownerSVGElement
}
function getNodeEl() {
if (node == null) {
node = initNode()
// re-add node to DOM
rootElement.appendChild(node)
}
return d3Selection.select(node)
}
// Private - gets the screen coordinates of a shape
//
// Given a shape on the screen, will return an SVGPoint for the directions
// n(north), s(south), e(east), w(west), ne(northeast), se(southeast),
// nw(northwest), sw(southwest).
//
// +-+-+
// | |
// + +
// | |
// +-+-+
//
// Returns an Object {n, s, e, w, nw, sw, ne, se}
function getScreenBBox() {
var targetel = target || d3Selection.event.target
while (targetel.getScreenCTM == null && targetel.parentNode == null) {
targetel = targetel.parentNode
}
var bbox = {},
matrix = targetel.getScreenCTM(),
tbbox = targetel.getBBox(),
width = tbbox.width,
height = tbbox.height,
x = tbbox.x,
y = tbbox.y
point.x = x
point.y = y
bbox.nw = point.matrixTransform(matrix)
point.x += width
bbox.ne = point.matrixTransform(matrix)
point.y += height
bbox.se = point.matrixTransform(matrix)
point.x -= width
bbox.sw = point.matrixTransform(matrix)
point.y -= height / 2
bbox.w = point.matrixTransform(matrix)
point.x += width
bbox.e = point.matrixTransform(matrix)
point.x -= width / 2
point.y -= height / 2
bbox.n = point.matrixTransform(matrix)
point.y += height
bbox.s = point.matrixTransform(matrix)
return bbox
}
// Private - replace D3JS 3.X d3.functor() function
function functor(v) {
return typeof v === 'function' ? v : function() {
return v
}
}
return tip
}
// eslint-disable-next-line semi
}));

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