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hover.js
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/**
* Copyright 2012-2017, Plotly, Inc.
* All rights reserved.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
'use strict';
var d3 = require('d3');
var isNumeric = require('fast-isnumeric');
var tinycolor = require('tinycolor2');
var Lib = require('../../lib');
var Events = require('../../lib/events');
var svgTextUtils = require('../../lib/svg_text_utils');
var overrideCursor = require('../../lib/override_cursor');
var Drawing = require('../drawing');
var Color = require('../color');
var dragElement = require('../dragelement');
var Axes = require('../../plots/cartesian/axes');
var Registry = require('../../registry');
var helpers = require('./helpers');
var constants = require('./constants');
// hover labels for multiple horizontal bars get tilted by some angle,
// then need to be offset differently if they overlap
var YANGLE = constants.YANGLE;
var YA_RADIANS = Math.PI * YANGLE / 180;
// expansion of projected height
var YFACTOR = 1 / Math.sin(YA_RADIANS);
// to make the appropriate post-rotation x offset,
// you need both x and y offsets
var YSHIFTX = Math.cos(YA_RADIANS);
var YSHIFTY = Math.sin(YA_RADIANS);
// size and display constants for hover text
var HOVERARROWSIZE = constants.HOVERARROWSIZE;
var HOVERTEXTPAD = constants.HOVERTEXTPAD;
// fx.hover: highlight data on hover
// evt can be a mousemove event, or an object with data about what points
// to hover on
// {xpx,ypx[,hovermode]} - pixel locations from top left
// (with optional overriding hovermode)
// {xval,yval[,hovermode]} - data values
// [{curveNumber,(pointNumber|xval and/or yval)}] -
// array of specific points to highlight
// pointNumber is a single integer if gd.data[curveNumber] is 1D,
// or a two-element array if it's 2D
// xval and yval are data values,
// 1D data may specify either or both,
// 2D data must specify both
// subplot is an id string (default "xy")
// makes use of gl.hovermode, which can be:
// x (find the points with the closest x values, ie a column),
// closest (find the single closest point)
// internally there are two more that occasionally get used:
// y (pick out a row - only used for multiple horizontal bar charts)
// array (used when the user specifies an explicit
// array of points to hover on)
//
// We wrap the hovers in a timer, to limit their frequency.
// The actual rendering is done by private function _hover.
exports.hover = function hover(gd, evt, subplot, noHoverEvent) {
if(typeof gd === 'string') gd = document.getElementById(gd);
if(gd._lastHoverTime === undefined) gd._lastHoverTime = 0;
// If we have an update queued, discard it now
if(gd._hoverTimer !== undefined) {
clearTimeout(gd._hoverTimer);
gd._hoverTimer = undefined;
}
// Is it more than 100ms since the last update? If so, force
// an update now (synchronously) and exit
if(Date.now() > gd._lastHoverTime + constants.HOVERMINTIME) {
_hover(gd, evt, subplot, noHoverEvent);
gd._lastHoverTime = Date.now();
return;
}
// Queue up the next hover for 100ms from now (if no further events)
gd._hoverTimer = setTimeout(function() {
_hover(gd, evt, subplot, noHoverEvent);
gd._lastHoverTime = Date.now();
gd._hoverTimer = undefined;
}, constants.HOVERMINTIME);
};
/*
* Draw a single hover item in a pre-existing svg container somewhere
* hoverItem should have keys:
* - x and y (or x0, x1, y0, and y1):
* the pixel position to mark, relative to opts.container
* - xLabel, yLabel, zLabel, text, and name:
* info to go in the label
* - color:
* the background color for the label.
* - idealAlign (optional):
* 'left' or 'right' for which side of the x/y box to try to put this on first
* - borderColor (optional):
* color for the border, defaults to strongest contrast with color
* - fontFamily (optional):
* string, the font for this label, defaults to constants.HOVERFONT
* - fontSize (optional):
* the label font size, defaults to constants.HOVERFONTSIZE
* - fontColor (optional):
* defaults to borderColor
* opts should have keys:
* - bgColor:
* the background color this is against, used if the trace is
* non-opaque, and for the name, which goes outside the box
* - container:
* a <svg> or <g> element to add the hover label to
* - outerContainer:
* normally a parent of `container`, sets the bounding box to use to
* constrain the hover label and determine whether to show it on the left or right
*/
exports.loneHover = function loneHover(hoverItem, opts) {
var pointData = {
color: hoverItem.color || Color.defaultLine,
x0: hoverItem.x0 || hoverItem.x || 0,
x1: hoverItem.x1 || hoverItem.x || 0,
y0: hoverItem.y0 || hoverItem.y || 0,
y1: hoverItem.y1 || hoverItem.y || 0,
xLabel: hoverItem.xLabel,
yLabel: hoverItem.yLabel,
zLabel: hoverItem.zLabel,
text: hoverItem.text,
name: hoverItem.name,
idealAlign: hoverItem.idealAlign,
// optional extra bits of styling
borderColor: hoverItem.borderColor,
fontFamily: hoverItem.fontFamily,
fontSize: hoverItem.fontSize,
fontColor: hoverItem.fontColor,
// filler to make createHoverText happy
trace: {
index: 0,
hoverinfo: ''
},
xa: {_offset: 0},
ya: {_offset: 0},
index: 0
};
var container3 = d3.select(opts.container),
outerContainer3 = opts.outerContainer ?
d3.select(opts.outerContainer) : container3;
var fullOpts = {
hovermode: 'closest',
rotateLabels: false,
bgColor: opts.bgColor || Color.background,
container: container3,
outerContainer: outerContainer3
};
var hoverLabel = createHoverText([pointData], fullOpts, opts.gd);
alignHoverText(hoverLabel, fullOpts.rotateLabels);
return hoverLabel.node();
};
// The actual implementation is here:
function _hover(gd, evt, subplot, noHoverEvent) {
if((subplot === 'pie' || subplot === 'sankey') && !noHoverEvent) {
gd.emit('plotly_hover', {
event: evt.originalEvent,
points: [evt]
});
return;
}
if(!subplot) subplot = 'xy';
// if the user passed in an array of subplots,
// use those instead of finding overlayed plots
var subplots = Array.isArray(subplot) ? subplot : [subplot];
var fullLayout = gd._fullLayout,
plots = fullLayout._plots || [],
plotinfo = plots[subplot];
// list of all overlaid subplots to look at
if(plotinfo) {
var overlayedSubplots = plotinfo.overlays.map(function(pi) {
return pi.id;
});
subplots = subplots.concat(overlayedSubplots);
}
var len = subplots.length,
xaArray = new Array(len),
yaArray = new Array(len);
for(var i = 0; i < len; i++) {
var spId = subplots[i];
// 'cartesian' case
var plotObj = plots[spId];
if(plotObj) {
// TODO make sure that fullLayout_plots axis refs
// get updated properly so that we don't have
// to use Axes.getFromId in general.
xaArray[i] = Axes.getFromId(gd, plotObj.xaxis._id);
yaArray[i] = Axes.getFromId(gd, plotObj.yaxis._id);
continue;
}
// other subplot types
var _subplot = fullLayout[spId]._subplot;
xaArray[i] = _subplot.xaxis;
yaArray[i] = _subplot.yaxis;
}
var hovermode = evt.hovermode || fullLayout.hovermode;
if(['x', 'y', 'closest'].indexOf(hovermode) === -1 || !gd.calcdata ||
gd.querySelector('.zoombox') || gd._dragging) {
return dragElement.unhoverRaw(gd, evt);
}
// hoverData: the set of candidate points we've found to highlight
var hoverData = [],
// searchData: the data to search in. Mostly this is just a copy of
// gd.calcdata, filtered to the subplot and overlays we're on
// but if a point array is supplied it will be a mapping
// of indicated curves
searchData = [],
// [x|y]valArray: the axis values of the hover event
// mapped onto each of the currently selected overlaid subplots
xvalArray,
yvalArray,
// used in loops
itemnum,
curvenum,
cd,
trace,
subplotId,
subploti,
mode,
xval,
yval,
pointData,
closedataPreviousLength;
// Figure out what we're hovering on:
// mouse location or user-supplied data
if(Array.isArray(evt)) {
// user specified an array of points to highlight
hovermode = 'array';
for(itemnum = 0; itemnum < evt.length; itemnum++) {
cd = gd.calcdata[evt[itemnum].curveNumber||0];
if(cd[0].trace.hoverinfo !== 'skip') {
searchData.push(cd);
}
}
}
else {
for(curvenum = 0; curvenum < gd.calcdata.length; curvenum++) {
cd = gd.calcdata[curvenum];
trace = cd[0].trace;
if(trace.hoverinfo !== 'skip' && subplots.indexOf(helpers.getSubplot(trace)) !== -1) {
searchData.push(cd);
}
}
// [x|y]px: the pixels (from top left) of the mouse location
// on the currently selected plot area
var hasUserCalledHover = !evt.target,
xpx, ypx;
if(hasUserCalledHover) {
if('xpx' in evt) xpx = evt.xpx;
else xpx = xaArray[0]._length / 2;
if('ypx' in evt) ypx = evt.ypx;
else ypx = yaArray[0]._length / 2;
}
else {
// fire the beforehover event and quit if it returns false
// note that we're only calling this on real mouse events, so
// manual calls to fx.hover will always run.
if(Events.triggerHandler(gd, 'plotly_beforehover', evt) === false) {
return;
}
var dbb = evt.target.getBoundingClientRect();
xpx = evt.clientX - dbb.left;
ypx = evt.clientY - dbb.top;
// in case hover was called from mouseout into hovertext,
// it's possible you're not actually over the plot anymore
if(xpx < 0 || xpx > dbb.width || ypx < 0 || ypx > dbb.height) {
return dragElement.unhoverRaw(gd, evt);
}
}
if('xval' in evt) xvalArray = helpers.flat(subplots, evt.xval);
else xvalArray = helpers.p2c(xaArray, xpx);
if('yval' in evt) yvalArray = helpers.flat(subplots, evt.yval);
else yvalArray = helpers.p2c(yaArray, ypx);
if(!isNumeric(xvalArray[0]) || !isNumeric(yvalArray[0])) {
Lib.warn('Fx.hover failed', evt, gd);
return dragElement.unhoverRaw(gd, evt);
}
}
// the pixel distance to beat as a matching point
// in 'x' or 'y' mode this resets for each trace
var distance = Infinity;
// find the closest point in each trace
// this is minimum dx and/or dy, depending on mode
// and the pixel position for the label (labelXpx, labelYpx)
for(curvenum = 0; curvenum < searchData.length; curvenum++) {
cd = searchData[curvenum];
// filter out invisible or broken data
if(!cd || !cd[0] || !cd[0].trace || cd[0].trace.visible !== true) continue;
trace = cd[0].trace;
// Explicitly bail out for these two. I don't know how to otherwise prevent
// the rest of this function from running and failing
if(['carpet', 'contourcarpet'].indexOf(trace._module.name) !== -1) continue;
subplotId = helpers.getSubplot(trace);
subploti = subplots.indexOf(subplotId);
// within one trace mode can sometimes be overridden
mode = hovermode;
// container for new point, also used to pass info into module.hoverPoints
pointData = {
// trace properties
cd: cd,
trace: trace,
xa: xaArray[subploti],
ya: yaArray[subploti],
// point properties - override all of these
index: false, // point index in trace - only used by plotly.js hoverdata consumers
distance: Math.min(distance, constants.MAXDIST), // pixel distance or pseudo-distance
color: Color.defaultLine, // trace color
name: trace.name,
x0: undefined,
x1: undefined,
y0: undefined,
y1: undefined,
xLabelVal: undefined,
yLabelVal: undefined,
zLabelVal: undefined,
text: undefined
};
// add ref to subplot object (non-cartesian case)
if(fullLayout[subplotId]) {
pointData.subplot = fullLayout[subplotId]._subplot;
}
closedataPreviousLength = hoverData.length;
// for a highlighting array, figure out what
// we're searching for with this element
if(mode === 'array') {
var selection = evt[curvenum];
if('pointNumber' in selection) {
pointData.index = selection.pointNumber;
mode = 'closest';
}
else {
mode = '';
if('xval' in selection) {
xval = selection.xval;
mode = 'x';
}
if('yval' in selection) {
yval = selection.yval;
mode = mode ? 'closest' : 'y';
}
}
}
else {
xval = xvalArray[subploti];
yval = yvalArray[subploti];
}
// Now find the points.
if(trace._module && trace._module.hoverPoints) {
var newPoints = trace._module.hoverPoints(pointData, xval, yval, mode);
if(newPoints) {
var newPoint;
for(var newPointNum = 0; newPointNum < newPoints.length; newPointNum++) {
newPoint = newPoints[newPointNum];
if(isNumeric(newPoint.x0) && isNumeric(newPoint.y0)) {
hoverData.push(cleanPoint(newPoint, hovermode));
}
}
}
}
else {
Lib.log('Unrecognized trace type in hover:', trace);
}
// in closest mode, remove any existing (farther) points
// and don't look any farther than this latest point (or points, if boxes)
if(hovermode === 'closest' && hoverData.length > closedataPreviousLength) {
hoverData.splice(0, closedataPreviousLength);
distance = hoverData[0].distance;
}
}
// nothing left: remove all labels and quit
if(hoverData.length === 0) return dragElement.unhoverRaw(gd, evt);
hoverData.sort(function(d1, d2) { return d1.distance - d2.distance; });
// lastly, emit custom hover/unhover events
var oldhoverdata = gd._hoverdata,
newhoverdata = [];
// pull out just the data that's useful to
// other people and send it to the event
for(itemnum = 0; itemnum < hoverData.length; itemnum++) {
var pt = hoverData[itemnum];
var out = {
data: pt.trace._input,
fullData: pt.trace,
curveNumber: pt.trace.index,
pointNumber: pt.index
};
if(pt.trace._module.eventData) out = pt.trace._module.eventData(out, pt);
else {
out.x = pt.xVal;
out.y = pt.yVal;
out.xaxis = pt.xa;
out.yaxis = pt.ya;
if(pt.zLabelVal !== undefined) out.z = pt.zLabelVal;
}
helpers.appendArrayPointValue(out, pt.trace, pt.index);
newhoverdata.push(out);
}
gd._hoverdata = newhoverdata;
if(hoverChanged(gd, evt, oldhoverdata) && fullLayout._hasCartesian) {
var spikelineOpts = {
hovermode: hovermode,
fullLayout: fullLayout,
container: fullLayout._hoverlayer,
outerContainer: fullLayout._paperdiv
};
createSpikelines(hoverData, spikelineOpts);
}
// if there's more than one horz bar trace,
// rotate the labels so they don't overlap
var rotateLabels = hovermode === 'y' && searchData.length > 1;
var bgColor = Color.combine(
fullLayout.plot_bgcolor || Color.background,
fullLayout.paper_bgcolor
);
var labelOpts = {
hovermode: hovermode,
rotateLabels: rotateLabels,
bgColor: bgColor,
container: fullLayout._hoverlayer,
outerContainer: fullLayout._paperdiv,
commonLabelOpts: fullLayout.hoverlabel
};
var hoverLabels = createHoverText(hoverData, labelOpts, gd);
hoverAvoidOverlaps(hoverData, rotateLabels ? 'xa' : 'ya');
alignHoverText(hoverLabels, rotateLabels);
// TODO: tagName hack is needed to appease geo.js's hack of using evt.target=true
// we should improve the "fx" API so other plots can use it without these hack.
if(evt.target && evt.target.tagName) {
var hasClickToShow = Registry.getComponentMethod('annotations', 'hasClickToShow')(gd, newhoverdata);
overrideCursor(d3.select(evt.target), hasClickToShow ? 'pointer' : '');
}
// don't emit events if called manually
if(!evt.target || noHoverEvent || !hoverChanged(gd, evt, oldhoverdata)) return;
if(oldhoverdata) {
gd.emit('plotly_unhover', {
event: evt,
points: oldhoverdata
});
}
gd.emit('plotly_hover', {
event: evt,
points: gd._hoverdata,
xaxes: xaArray,
yaxes: yaArray,
xvals: xvalArray,
yvals: yvalArray
});
}
function createHoverText(hoverData, opts, gd) {
var hovermode = opts.hovermode;
var rotateLabels = opts.rotateLabels;
var bgColor = opts.bgColor;
var container = opts.container;
var outerContainer = opts.outerContainer;
var commonLabelOpts = opts.commonLabelOpts || {};
// opts.fontFamily/Size are used for the common label
// and as defaults for each hover label, though the individual labels
// can override this.
var fontFamily = opts.fontFamily || constants.HOVERFONT;
var fontSize = opts.fontSize || constants.HOVERFONTSIZE;
var c0 = hoverData[0];
var xa = c0.xa;
var ya = c0.ya;
var commonAttr = hovermode === 'y' ? 'yLabel' : 'xLabel';
var t0 = c0[commonAttr];
var t00 = (String(t0) || '').split(' ')[0];
var outerContainerBB = outerContainer.node().getBoundingClientRect();
var outerTop = outerContainerBB.top;
var outerWidth = outerContainerBB.width;
var outerHeight = outerContainerBB.height;
// show the common label, if any, on the axis
// never show a common label in array mode,
// even if sometimes there could be one
var showCommonLabel = c0.distance <= constants.MAXDIST &&
(hovermode === 'x' || hovermode === 'y');
// all hover traces hoverinfo must contain the hovermode
// to have common labels
var i, traceHoverinfo;
for(i = 0; i < hoverData.length; i++) {
traceHoverinfo = hoverData[i].hoverinfo || hoverData[i].trace.hoverinfo;
var parts = traceHoverinfo.split('+');
if(parts.indexOf('all') === -1 &&
parts.indexOf(hovermode) === -1) {
showCommonLabel = false;
break;
}
}
var commonLabel = container.selectAll('g.axistext')
.data(showCommonLabel ? [0] : []);
commonLabel.enter().append('g')
.classed('axistext', true);
commonLabel.exit().remove();
commonLabel.each(function() {
var label = d3.select(this),
lpath = label.selectAll('path').data([0]),
ltext = label.selectAll('text').data([0]);
lpath.enter().append('path')
.style({
fill: commonLabelOpts.bgcolor || Color.defaultLine,
stroke: commonLabelOpts.bordercolor || Color.background,
'stroke-width': '1px'
});
ltext.enter().append('text')
.call(Drawing.font,
commonLabelOpts.font.family || fontFamily,
commonLabelOpts.font.size || fontSize,
commonLabelOpts.font.color || Color.background
)
// prohibit tex interpretation until we can handle
// tex and regular text together
.attr('data-notex', 1);
ltext.text(t0)
.call(svgTextUtils.positionText, 0, 0)
.call(svgTextUtils.convertToTspans, gd);
label.attr('transform', '');
var tbb = ltext.node().getBoundingClientRect();
if(hovermode === 'x') {
ltext.attr('text-anchor', 'middle')
.call(svgTextUtils.positionText, 0, (xa.side === 'top' ?
(outerTop - tbb.bottom - HOVERARROWSIZE - HOVERTEXTPAD) :
(outerTop - tbb.top + HOVERARROWSIZE + HOVERTEXTPAD)));
var topsign = xa.side === 'top' ? '-' : '';
lpath.attr('d', 'M0,0' +
'L' + HOVERARROWSIZE + ',' + topsign + HOVERARROWSIZE +
'H' + (HOVERTEXTPAD + tbb.width / 2) +
'v' + topsign + (HOVERTEXTPAD * 2 + tbb.height) +
'H-' + (HOVERTEXTPAD + tbb.width / 2) +
'V' + topsign + HOVERARROWSIZE + 'H-' + HOVERARROWSIZE + 'Z');
label.attr('transform', 'translate(' +
(xa._offset + (c0.x0 + c0.x1) / 2) + ',' +
(ya._offset + (xa.side === 'top' ? 0 : ya._length)) + ')');
}
else {
ltext.attr('text-anchor', ya.side === 'right' ? 'start' : 'end')
.call(svgTextUtils.positionText,
(ya.side === 'right' ? 1 : -1) * (HOVERTEXTPAD + HOVERARROWSIZE),
outerTop - tbb.top - tbb.height / 2);
var leftsign = ya.side === 'right' ? '' : '-';
lpath.attr('d', 'M0,0' +
'L' + leftsign + HOVERARROWSIZE + ',' + HOVERARROWSIZE +
'V' + (HOVERTEXTPAD + tbb.height / 2) +
'h' + leftsign + (HOVERTEXTPAD * 2 + tbb.width) +
'V-' + (HOVERTEXTPAD + tbb.height / 2) +
'H' + leftsign + HOVERARROWSIZE + 'V-' + HOVERARROWSIZE + 'Z');
label.attr('transform', 'translate(' +
(xa._offset + (ya.side === 'right' ? xa._length : 0)) + ',' +
(ya._offset + (c0.y0 + c0.y1) / 2) + ')');
}
// remove the "close but not quite" points
// because of error bars, only take up to a space
hoverData = hoverData.filter(function(d) {
return (d.zLabelVal !== undefined) ||
(d[commonAttr] || '').split(' ')[0] === t00;
});
});
// show all the individual labels
// first create the objects
var hoverLabels = container.selectAll('g.hovertext')
.data(hoverData, function(d) {
return [d.trace.index, d.index, d.x0, d.y0, d.name, d.attr, d.xa, d.ya || ''].join(',');
});
hoverLabels.enter().append('g')
.classed('hovertext', true)
.each(function() {
var g = d3.select(this);
// trace name label (rect and text.name)
g.append('rect')
.call(Color.fill, Color.addOpacity(bgColor, 0.8));
g.append('text').classed('name', true);
// trace data label (path and text.nums)
g.append('path')
.style('stroke-width', '1px');
g.append('text').classed('nums', true)
.call(Drawing.font, fontFamily, fontSize);
});
hoverLabels.exit().remove();
// then put the text in, position the pointer to the data,
// and figure out sizes
hoverLabels.each(function(d) {
var g = d3.select(this).attr('transform', ''),
name = '',
text = '';
// combine possible non-opaque trace color with bgColor
var baseColor = Color.opacity(d.color) ? d.color : Color.defaultLine;
var traceColor = Color.combine(baseColor, bgColor);
// find a contrasting color for border and text
var contrastColor = d.borderColor || Color.contrast(traceColor);
// to get custom 'name' labels pass cleanPoint
if(d.nameOverride !== undefined) d.name = d.nameOverride;
if(d.name) {
// strip out our pseudo-html elements from d.name (if it exists at all)
name = svgTextUtils.plainText(d.name || '');
if(name.length > 15) name = name.substr(0, 12) + '...';
}
// used by other modules (initially just ternary) that
// manage their own hoverinfo independent of cleanPoint
// the rest of this will still apply, so such modules
// can still put things in (x|y|z)Label, text, and name
// and hoverinfo will still determine their visibility
if(d.extraText !== undefined) text += d.extraText;
if(d.zLabel !== undefined) {
if(d.xLabel !== undefined) text += 'x: ' + d.xLabel + '<br>';
if(d.yLabel !== undefined) text += 'y: ' + d.yLabel + '<br>';
text += (text ? 'z: ' : '') + d.zLabel;
}
else if(showCommonLabel && d[hovermode + 'Label'] === t0) {
text = d[(hovermode === 'x' ? 'y' : 'x') + 'Label'] || '';
}
else if(d.xLabel === undefined) {
if(d.yLabel !== undefined) text = d.yLabel;
}
else if(d.yLabel === undefined) text = d.xLabel;
else text = '(' + d.xLabel + ', ' + d.yLabel + ')';
if(d.text && !Array.isArray(d.text)) {
text += (text ? '<br>' : '') + d.text;
}
// if 'text' is empty at this point,
// put 'name' in main label and don't show secondary label
if(text === '') {
// if 'name' is also empty, remove entire label
if(name === '') g.remove();
text = name;
}
// main label
var tx = g.select('text.nums')
.call(Drawing.font,
d.fontFamily || fontFamily,
d.fontSize || fontSize,
d.fontColor || contrastColor)
.text(text)
.attr('data-notex', 1)
.call(svgTextUtils.positionText, 0, 0)
.call(svgTextUtils.convertToTspans, gd);
var tx2 = g.select('text.name'),
tx2width = 0;
// secondary label for non-empty 'name'
if(name && name !== text) {
tx2.call(Drawing.font,
d.fontFamily || fontFamily,
d.fontSize || fontSize,
traceColor)
.text(name)
.attr('data-notex', 1)
.call(svgTextUtils.positionText, 0, 0)
.call(svgTextUtils.convertToTspans, gd);
tx2width = tx2.node().getBoundingClientRect().width + 2 * HOVERTEXTPAD;
}
else {
tx2.remove();
g.select('rect').remove();
}
g.select('path')
.style({
fill: traceColor,
stroke: contrastColor
});
var tbb = tx.node().getBoundingClientRect(),
htx = d.xa._offset + (d.x0 + d.x1) / 2,
hty = d.ya._offset + (d.y0 + d.y1) / 2,
dx = Math.abs(d.x1 - d.x0),
dy = Math.abs(d.y1 - d.y0),
txTotalWidth = tbb.width + HOVERARROWSIZE + HOVERTEXTPAD + tx2width,
anchorStartOK,
anchorEndOK;
d.ty0 = outerTop - tbb.top;
d.bx = tbb.width + 2 * HOVERTEXTPAD;
d.by = tbb.height + 2 * HOVERTEXTPAD;
d.anchor = 'start';
d.txwidth = tbb.width;
d.tx2width = tx2width;
d.offset = 0;
if(rotateLabels) {
d.pos = htx;
anchorStartOK = hty + dy / 2 + txTotalWidth <= outerHeight;
anchorEndOK = hty - dy / 2 - txTotalWidth >= 0;
if((d.idealAlign === 'top' || !anchorStartOK) && anchorEndOK) {
hty -= dy / 2;
d.anchor = 'end';
} else if(anchorStartOK) {
hty += dy / 2;
d.anchor = 'start';
} else d.anchor = 'middle';
}
else {
d.pos = hty;
anchorStartOK = htx + dx / 2 + txTotalWidth <= outerWidth;
anchorEndOK = htx - dx / 2 - txTotalWidth >= 0;
if((d.idealAlign === 'left' || !anchorStartOK) && anchorEndOK) {
htx -= dx / 2;
d.anchor = 'end';
} else if(anchorStartOK) {
htx += dx / 2;
d.anchor = 'start';
} else d.anchor = 'middle';
}
tx.attr('text-anchor', d.anchor);
if(tx2width) tx2.attr('text-anchor', d.anchor);
g.attr('transform', 'translate(' + htx + ',' + hty + ')' +
(rotateLabels ? 'rotate(' + YANGLE + ')' : ''));
});
return hoverLabels;
}
// Make groups of touching points, and within each group
// move each point so that no labels overlap, but the average
// label position is the same as it was before moving. Indicentally,
// this is equivalent to saying all the labels are on equal linear
// springs about their initial position. Initially, each point is
// its own group, but as we find overlaps we will clump the points.
//
// Also, there are hard constraints at the edges of the graphs,
// that push all groups to the middle so they are visible. I don't
// know what happens if the group spans all the way from one edge to
// the other, though it hardly matters - there's just too much
// information then.
function hoverAvoidOverlaps(hoverData, ax) {
var nummoves = 0,
// make groups of touching points
pointgroups = hoverData
.map(function(d, i) {
var axis = d[ax];
return [{
i: i,
dp: 0,
pos: d.pos,
posref: d.posref,
size: d.by * (axis._id.charAt(0) === 'x' ? YFACTOR : 1) / 2,
pmin: axis._offset,
pmax: axis._offset + axis._length
}];
})
.sort(function(a, b) { return a[0].posref - b[0].posref; }),
donepositioning,
topOverlap,
bottomOverlap,
i, j,
pti,
sumdp;
function constrainGroup(grp) {
var minPt = grp[0],
maxPt = grp[grp.length - 1];
// overlap with the top - positive vals are overlaps
topOverlap = minPt.pmin - minPt.pos - minPt.dp + minPt.size;
// overlap with the bottom - positive vals are overlaps
bottomOverlap = maxPt.pos + maxPt.dp + maxPt.size - minPt.pmax;
// check for min overlap first, so that we always
// see the largest labels
// allow for .01px overlap, so we don't get an
// infinite loop from rounding errors
if(topOverlap > 0.01) {
for(j = grp.length - 1; j >= 0; j--) grp[j].dp += topOverlap;
donepositioning = false;
}
if(bottomOverlap < 0.01) return;
if(topOverlap < -0.01) {
// make sure we're not pushing back and forth
for(j = grp.length - 1; j >= 0; j--) grp[j].dp -= bottomOverlap;
donepositioning = false;
}
if(!donepositioning) return;
// no room to fix positioning, delete off-screen points
// first see how many points we need to delete
var deleteCount = 0;
for(i = 0; i < grp.length; i++) {
pti = grp[i];
if(pti.pos + pti.dp + pti.size > minPt.pmax) deleteCount++;
}
// start by deleting points whose data is off screen
for(i = grp.length - 1; i >= 0; i--) {
if(deleteCount <= 0) break;
pti = grp[i];
// pos has already been constrained to [pmin,pmax]
// so look for points close to that to delete
if(pti.pos > minPt.pmax - 1) {
pti.del = true;
deleteCount--;
}
}
for(i = 0; i < grp.length; i++) {
if(deleteCount <= 0) break;
pti = grp[i];
// pos has already been constrained to [pmin,pmax]
// so look for points close to that to delete
if(pti.pos < minPt.pmin + 1) {
pti.del = true;
deleteCount--;
// shift the whole group minus into this new space
bottomOverlap = pti.size * 2;
for(j = grp.length - 1; j >= 0; j--) grp[j].dp -= bottomOverlap;
}
}
// then delete points that go off the bottom
for(i = grp.length - 1; i >= 0; i--) {
if(deleteCount <= 0) break;
pti = grp[i];
if(pti.pos + pti.dp + pti.size > minPt.pmax) {
pti.del = true;
deleteCount--;
}
}
}
// loop through groups, combining them if they overlap,
// until nothing moves
while(!donepositioning && nummoves <= hoverData.length) {
// to avoid infinite loops, don't move more times
// than there are traces
nummoves++;
// assume nothing will move in this iteration,
// reverse this if it does
donepositioning = true;
i = 0;
while(i < pointgroups.length - 1) {
// the higher (g0) and lower (g1) point group
var g0 = pointgroups[i],
g1 = pointgroups[i + 1],
// the lowest point in the higher group (p0)
// the highest point in the lower group (p1)
p0 = g0[g0.length - 1],
p1 = g1[0];
topOverlap = p0.pos + p0.dp + p0.size - p1.pos - p1.dp + p1.size;
// Only group points that lie on the same axes
if(topOverlap > 0.01 && (p0.pmin === p1.pmin) && (p0.pmax === p1.pmax)) {
// push the new point(s) added to this group out of the way
for(j = g1.length - 1; j >= 0; j--) g1[j].dp += topOverlap;
// add them to the group
g0.push.apply(g0, g1);
pointgroups.splice(i + 1, 1);
// adjust for minimum average movement
sumdp = 0;
for(j = g0.length - 1; j >= 0; j--) sumdp += g0[j].dp;
bottomOverlap = sumdp / g0.length;
for(j = g0.length - 1; j >= 0; j--) g0[j].dp -= bottomOverlap;
donepositioning = false;
}
else i++;
}
// check if we're going off the plot on either side and fix
pointgroups.forEach(constrainGroup);
}
// now put these offsets into hoverData
for(i = pointgroups.length - 1; i >= 0; i--) {
var grp = pointgroups[i];
for(j = grp.length - 1; j >= 0; j--) {
var pt = grp[j],
hoverPt = hoverData[pt.i];
hoverPt.offset = pt.dp;
hoverPt.del = pt.del;
}
}
}
function alignHoverText(hoverLabels, rotateLabels) {
// finally set the text positioning relative to the data and draw the
// box around it
hoverLabels.each(function(d) {
var g = d3.select(this);
if(d.del) {
g.remove();
return;
}
var horzSign = d.anchor === 'end' ? -1 : 1,
tx = g.select('text.nums'),
alignShift = {start: 1, end: -1, middle: 0}[d.anchor],
txx = alignShift * (HOVERARROWSIZE + HOVERTEXTPAD),
tx2x = txx + alignShift * (d.txwidth + HOVERTEXTPAD),
offsetX = 0,
offsetY = d.offset;
if(d.anchor === 'middle') {
txx -= d.tx2width / 2;
tx2x -= d.tx2width / 2;