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graph_interact.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 Lib = require('../../lib');
var Events = require('../../lib/events');
var svgTextUtils = require('../../lib/svg_text_utils');
var Color = require('../../components/color');
var Drawing = require('../../components/drawing');
var dragElement = require('../../components/dragelement');
var overrideCursor = require('../../lib/override_cursor');
var Registry = require('../../registry');
var Axes = require('./axes');
var constants = require('./constants');
var dragBox = require('./dragbox');
var layoutAttributes = require('../layout_attributes');
var fx = module.exports = {};
// TODO remove this in version 2.0
// copy on Fx for backward compatible
fx.unhover = dragElement.unhover;
fx.supplyLayoutDefaults = function(layoutIn, layoutOut, fullData) {
function coerce(attr, dflt) {
return Lib.coerce(layoutIn, layoutOut, layoutAttributes, attr, dflt);
}
coerce('dragmode');
var hovermodeDflt;
if(layoutOut._has('cartesian')) {
// flag for 'horizontal' plots:
// determines the state of the mode bar 'compare' hovermode button
var isHoriz = layoutOut._isHoriz = fx.isHoriz(fullData);
hovermodeDflt = isHoriz ? 'y' : 'x';
}
else hovermodeDflt = 'closest';
coerce('hovermode', hovermodeDflt);
};
fx.isHoriz = function(fullData) {
var isHoriz = true;
for(var i = 0; i < fullData.length; i++) {
var trace = fullData[i];
if(trace.orientation !== 'h') {
isHoriz = false;
break;
}
}
return isHoriz;
};
fx.init = function(gd) {
var fullLayout = gd._fullLayout;
if(!fullLayout._has('cartesian') || gd._context.staticPlot) return;
var subplots = Object.keys(fullLayout._plots || {}).sort(function(a, b) {
// sort overlays last, then by x axis number, then y axis number
if((fullLayout._plots[a].mainplot && true) ===
(fullLayout._plots[b].mainplot && true)) {
var aParts = a.split('y'),
bParts = b.split('y');
return (aParts[0] === bParts[0]) ?
(Number(aParts[1] || 1) - Number(bParts[1] || 1)) :
(Number(aParts[0] || 1) - Number(bParts[0] || 1));
}
return fullLayout._plots[a].mainplot ? 1 : -1;
});
subplots.forEach(function(subplot) {
var plotinfo = fullLayout._plots[subplot];
if(!fullLayout._has('cartesian')) return;
var xa = plotinfo.xaxis,
ya = plotinfo.yaxis,
// the y position of the main x axis line
y0 = (xa._linepositions[subplot] || [])[3],
// the x position of the main y axis line
x0 = (ya._linepositions[subplot] || [])[3];
var DRAGGERSIZE = constants.DRAGGERSIZE;
if(isNumeric(y0) && xa.side === 'top') y0 -= DRAGGERSIZE;
if(isNumeric(x0) && ya.side !== 'right') x0 -= DRAGGERSIZE;
// main and corner draggers need not be repeated for
// overlaid subplots - these draggers drag them all
if(!plotinfo.mainplot) {
// main dragger goes over the grids and data, so we use its
// mousemove events for all data hover effects
var maindrag = dragBox(gd, plotinfo, 0, 0,
xa._length, ya._length, 'ns', 'ew');
maindrag.onmousemove = function(evt) {
// This is on `gd._fullLayout`, *not* fullLayout because the reference
// changes by the time this is called again.
gd._fullLayout._rehover = function() {
if(gd._fullLayout._hoversubplot === subplot) {
fx.hover(gd, evt, subplot);
}
};
fx.hover(gd, evt, subplot);
// Note that we have *not* used the cached fullLayout variable here
// since that may be outdated when this is called as a callback later on
gd._fullLayout._lasthover = maindrag;
gd._fullLayout._hoversubplot = subplot;
};
/*
* IMPORTANT:
* We must check for the presence of the drag cover here.
* If we don't, a 'mouseout' event is triggered on the
* maindrag before each 'click' event, which has the effect
* of clearing the hoverdata; thus, cancelling the click event.
*/
maindrag.onmouseout = function(evt) {
if(gd._dragging) return;
// When the mouse leaves this maindrag, unset the hovered subplot.
// This may cause problems if it leaves the subplot directly *onto*
// another subplot, but that's a tiny corner case at the moment.
gd._fullLayout._hoversubplot = null;
dragElement.unhover(gd, evt);
};
maindrag.onclick = function(evt) {
fx.click(gd, evt);
};
// corner draggers
if(gd._context.showAxisDragHandles) {
dragBox(gd, plotinfo, -DRAGGERSIZE, -DRAGGERSIZE,
DRAGGERSIZE, DRAGGERSIZE, 'n', 'w');
dragBox(gd, plotinfo, xa._length, -DRAGGERSIZE,
DRAGGERSIZE, DRAGGERSIZE, 'n', 'e');
dragBox(gd, plotinfo, -DRAGGERSIZE, ya._length,
DRAGGERSIZE, DRAGGERSIZE, 's', 'w');
dragBox(gd, plotinfo, xa._length, ya._length,
DRAGGERSIZE, DRAGGERSIZE, 's', 'e');
}
}
if(gd._context.showAxisDragHandles) {
// x axis draggers - if you have overlaid plots,
// these drag each axis separately
if(isNumeric(y0)) {
if(xa.anchor === 'free') y0 -= fullLayout._size.h * (1 - ya.domain[1]);
dragBox(gd, plotinfo, xa._length * 0.1, y0,
xa._length * 0.8, DRAGGERSIZE, '', 'ew');
dragBox(gd, plotinfo, 0, y0,
xa._length * 0.1, DRAGGERSIZE, '', 'w');
dragBox(gd, plotinfo, xa._length * 0.9, y0,
xa._length * 0.1, DRAGGERSIZE, '', 'e');
}
// y axis draggers
if(isNumeric(x0)) {
if(ya.anchor === 'free') x0 -= fullLayout._size.w * xa.domain[0];
dragBox(gd, plotinfo, x0, ya._length * 0.1,
DRAGGERSIZE, ya._length * 0.8, 'ns', '');
dragBox(gd, plotinfo, x0, ya._length * 0.9,
DRAGGERSIZE, ya._length * 0.1, 's', '');
dragBox(gd, plotinfo, x0, 0,
DRAGGERSIZE, ya._length * 0.1, 'n', '');
}
}
});
// In case you mousemove over some hovertext, send it to fx.hover too
// we do this so that we can put the hover text in front of everything,
// but still be able to interact with everything as if it isn't there
var hoverLayer = fullLayout._hoverlayer.node();
hoverLayer.onmousemove = function(evt) {
evt.target = fullLayout._lasthover;
fx.hover(gd, evt, fullLayout._hoversubplot);
};
hoverLayer.onclick = function(evt) {
evt.target = fullLayout._lasthover;
fx.click(gd, evt);
};
// also delegate mousedowns... TODO: does this actually work?
hoverLayer.onmousedown = function(evt) {
fullLayout._lasthover.onmousedown(evt);
};
};
// hover labels for multiple horizontal bars get tilted by some angle,
// then need to be offset differently if they overlap
var YANGLE = constants.YANGLE,
YA_RADIANS = Math.PI * YANGLE / 180,
// expansion of projected height
YFACTOR = 1 / Math.sin(YA_RADIANS),
// to make the appropriate post-rotation x offset,
// you need both x and y offsets
YSHIFTX = Math.cos(YA_RADIANS),
YSHIFTY = Math.sin(YA_RADIANS);
// convenience functions for mapping all relevant axes
function flat(subplots, v) {
var out = [];
for(var i = subplots.length; i > 0; i--) out.push(v);
return out;
}
function p2c(axArray, v) {
var out = [];
for(var i = 0; i < axArray.length; i++) out.push(axArray[i].p2c(v));
return out;
}
function quadrature(dx, dy) {
return function(di) {
var x = dx(di),
y = dy(di);
return Math.sqrt(x * x + y * y);
};
}
// size and display constants for hover text
var HOVERARROWSIZE = constants.HOVERARROWSIZE,
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 functions
// hover() and unhover().
fx.hover = function(gd, evt, subplot) {
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);
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);
gd._lastHoverTime = Date.now();
gd._hoverTimer = undefined;
}, constants.HOVERMINTIME);
};
// The actual implementation is here:
function hover(gd, evt, subplot) {
if(['pie', 'sankey'].indexOf(subplot) !== -1) {
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(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 = flat(subplots, evt.xval);
else xvalArray = p2c(xaArray, xpx);
if('yval' in evt) yvalArray = flat(subplots, evt.yval);
else yvalArray = 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;
subplotId = 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],
name: (gd.data.length > 1 || trace.hoverinfo.indexOf('name') !== -1) ? trace.name : undefined,
// 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
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);
// if there's more than one horz bar trace,
// rotate the labels so they don't overlap
var rotateLabels = hovermode === 'y' && searchData.length > 1;
hoverData.sort(function(d1, d2) { return d1.distance - d2.distance; });
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
};
var hoverLabels = createHoverText(hoverData, labelOpts);
hoverAvoidOverlaps(hoverData, rotateLabels ? 'xa' : 'ya');
alignHoverText(hoverLabels, rotateLabels);
// 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;
}
newhoverdata.push(out);
}
gd._hoverdata = newhoverdata;
// 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' : '');
}
if(!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
});
}
// look for either .subplot (currently just ternary)
// or xaxis and yaxis attributes
function getSubplot(trace) {
return trace.subplot || (trace.xaxis + trace.yaxis) || trace.geo;
}
fx.getDistanceFunction = function(mode, dx, dy, dxy) {
if(mode === 'closest') return dxy || quadrature(dx, dy);
return mode === 'x' ? dx : dy;
};
fx.getClosest = function(cd, distfn, pointData) {
// do we already have a point number? (array mode only)
if(pointData.index !== false) {
if(pointData.index >= 0 && pointData.index < cd.length) {
pointData.distance = 0;
}
else pointData.index = false;
}
else {
// apply the distance function to each data point
// this is the longest loop... if this bogs down, we may need
// to create pre-sorted data (by x or y), not sure how to
// do this for 'closest'
for(var i = 0; i < cd.length; i++) {
var newDistance = distfn(cd[i]);
if(newDistance <= pointData.distance) {
pointData.index = i;
pointData.distance = newDistance;
}
}
}
return pointData;
};
function cleanPoint(d, hovermode) {
d.posref = hovermode === 'y' ? (d.x0 + d.x1) / 2 : (d.y0 + d.y1) / 2;
// then constrain all the positions to be on the plot
d.x0 = Lib.constrain(d.x0, 0, d.xa._length);
d.x1 = Lib.constrain(d.x1, 0, d.xa._length);
d.y0 = Lib.constrain(d.y0, 0, d.ya._length);
d.y1 = Lib.constrain(d.y1, 0, d.ya._length);
// and convert the x and y label values into objects
// formatted as text, with font info
var logOffScale;
if(d.xLabelVal !== undefined) {
logOffScale = (d.xa.type === 'log' && d.xLabelVal <= 0);
var xLabelObj = Axes.tickText(d.xa,
d.xa.c2l(logOffScale ? -d.xLabelVal : d.xLabelVal), 'hover');
if(logOffScale) {
if(d.xLabelVal === 0) d.xLabel = '0';
else d.xLabel = '-' + xLabelObj.text;
}
// TODO: should we do something special if the axis calendar and
// the data calendar are different? Somehow display both dates with
// their system names? Right now it will just display in the axis calendar
// but users could add the other one as text.
else d.xLabel = xLabelObj.text;
d.xVal = d.xa.c2d(d.xLabelVal);
}
if(d.yLabelVal !== undefined) {
logOffScale = (d.ya.type === 'log' && d.yLabelVal <= 0);
var yLabelObj = Axes.tickText(d.ya,
d.ya.c2l(logOffScale ? -d.yLabelVal : d.yLabelVal), 'hover');
if(logOffScale) {
if(d.yLabelVal === 0) d.yLabel = '0';
else d.yLabel = '-' + yLabelObj.text;
}
// TODO: see above TODO
else d.yLabel = yLabelObj.text;
d.yVal = d.ya.c2d(d.yLabelVal);
}
if(d.zLabelVal !== undefined) d.zLabel = String(d.zLabelVal);
// for box means and error bars, add the range to the label
if(!isNaN(d.xerr) && !(d.xa.type === 'log' && d.xerr <= 0)) {
var xeText = Axes.tickText(d.xa, d.xa.c2l(d.xerr), 'hover').text;
if(d.xerrneg !== undefined) {
d.xLabel += ' +' + xeText + ' / -' +
Axes.tickText(d.xa, d.xa.c2l(d.xerrneg), 'hover').text;
}
else d.xLabel += ' ± ' + xeText;
// small distance penalty for error bars, so that if there are
// traces with errors and some without, the error bar label will
// hoist up to the point
if(hovermode === 'x') d.distance += 1;
}
if(!isNaN(d.yerr) && !(d.ya.type === 'log' && d.yerr <= 0)) {
var yeText = Axes.tickText(d.ya, d.ya.c2l(d.yerr), 'hover').text;
if(d.yerrneg !== undefined) {
d.yLabel += ' +' + yeText + ' / -' +
Axes.tickText(d.ya, d.ya.c2l(d.yerrneg), 'hover').text;
}
else d.yLabel += ' ± ' + yeText;
if(hovermode === 'y') d.distance += 1;
}
var infomode = d.trace.hoverinfo;
if(infomode !== 'all') {
infomode = infomode.split('+');
if(infomode.indexOf('x') === -1) d.xLabel = undefined;
if(infomode.indexOf('y') === -1) d.yLabel = undefined;
if(infomode.indexOf('z') === -1) d.zLabel = undefined;
if(infomode.indexOf('text') === -1) d.text = undefined;
if(infomode.indexOf('name') === -1) d.name = undefined;
}
return d;
}
/*
* 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
*/
fx.loneHover = function(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);
alignHoverText(hoverLabel, fullOpts.rotateLabels);
return hoverLabel.node();
};
fx.loneUnhover = function(containerOrSelection) {
// duck type whether the arg is a d3 selection because ie9 doesn't
// handle instanceof like modern browsers do.
var selection = Lib.isD3Selection(containerOrSelection) ?
containerOrSelection :
d3.select(containerOrSelection);
selection.selectAll('g.hovertext').remove();
};
function createHoverText(hoverData, opts) {
var hovermode = opts.hovermode,
rotateLabels = opts.rotateLabels,
bgColor = opts.bgColor,
container = opts.container,
outerContainer = opts.outerContainer,
// opts.fontFamily/Size are used for the common label
// and as defaults for each hover label, though the individual labels
// can override this.
fontFamily = opts.fontFamily || constants.HOVERFONT,
fontSize = opts.fontSize || constants.HOVERFONTSIZE,
c0 = hoverData[0],
xa = c0.xa,
ya = c0.ya,
commonAttr = hovermode === 'y' ? 'yLabel' : 'xLabel',
t0 = c0[commonAttr],
t00 = (String(t0) || '').split(' ')[0],
outerContainerBB = outerContainer.node().getBoundingClientRect(),
outerTop = outerContainerBB.top,
outerWidth = outerContainerBB.width,
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].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: Color.defaultLine, 'stroke-width': '1px', stroke: Color.background});
ltext.enter().append('text')
.call(Drawing.font, fontFamily, fontSize, Color.background)
// prohibit tex interpretation until we can handle
// tex and regular text together
.attr('data-notex', 1);
ltext.text(t0)
.call(svgTextUtils.convertToTspans)
.call(Drawing.setPosition, 0, 0)
.selectAll('tspan.line')
.call(Drawing.setPosition, 0, 0);
label.attr('transform', '');
var tbb = ltext.node().getBoundingClientRect();
if(hovermode === 'x') {
ltext.attr('text-anchor', 'middle')
.call(Drawing.setPosition, 0, (xa.side === 'top' ?
(outerTop - tbb.bottom - HOVERARROWSIZE - HOVERTEXTPAD) :
(outerTop - tbb.top + HOVERARROWSIZE + HOVERTEXTPAD)))
.selectAll('tspan.line')
.attr({
x: ltext.attr('x'),
y: ltext.attr('y')
});
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(Drawing.setPosition,
(ya.side === 'right' ? 1 : -1) * (HOVERTEXTPAD + HOVERARROWSIZE),
outerTop - tbb.top - tbb.height / 2)
.selectAll('tspan.line')
.attr({
x: ltext.attr('x'),
y: ltext.attr('y')
});
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
baseColor = Color.opacity(d.color) ?
d.color : Color.defaultLine,
traceColor = Color.combine(baseColor, bgColor),
// find a contrasting color for border and text