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/*
* function-plot
*
* Copyright (c) 2015 Mauricio Poppe
* Licensed under the MIT license.
*/
'use strict'
require('./polyfills')
var d3 = window.d3
var events = require('events')
var extend = require('extend')
var mousetip = require('./tip')
var helpers = require('./helpers/')
var annotations = require('./helpers/annotations')
var datumDefaults = require('./datum-defaults')
var globals
var graphTypes
var cache = []
module.exports = function (options) {
options = options || {}
options.data = options.data || []
// globals
var width, height
var margin
var zoomBehavior
var xScale, yScale
var line = d3.svg.line()
.x(function (d) { return xScale(d[0]) })
.y(function (d) { return yScale(d[1]) })
function Chart () {
var n = Math.random()
var letter = String.fromCharCode(Math.floor(n * 26) + 97)
this.id = options.id = letter + n.toString(16).substr(2)
this.linkedGraphs = [this]
this.options = options
cache[this.id] = this
this.setUpEventListeners()
}
Chart.prototype = Object.create(events.prototype)
/**
* Rebuilds the entire graph from scratch recomputing
*
* - the inner width/height
* - scales/axes
*
* After this is done it does a complete redraw of all the datums,
* if only the datums need to be redrawn call `instance.draw()` instead
*
* @returns {Chart}
*/
Chart.prototype.build = function () {
this.internalVars()
this.drawGraphWrapper()
return this
}
Chart.prototype.initializeAxes = function () {
var integerFormat = d3.format('s')
var format = function (scale) {
return function (d) {
var decimalFormat = scale.tickFormat(10)
var isInteger = d === +d && d === (d | 0)
// integers: d3.format('s'), see https://github.com/mbostock/d3/wiki/Formatting
// decimals: default d3.scale.linear() formatting see
// https://github.com/mbostock/d3/blob/master/src/svg/axis.js#L29
return isInteger ? integerFormat(d) : decimalFormat(d)
}
}
function computeYScale (xScale) {
// assumes that xScale is a linear scale
var xDiff = xScale[1] - xScale[0]
return height * xDiff / width
}
options.xAxis = options.xAxis || {}
options.xAxis.type = options.xAxis.type || 'linear'
options.yAxis = options.yAxis || {}
options.yAxis.type = options.yAxis.type || 'linear'
var xDomain = this.meta.xDomain = (function (axis) {
if (axis.domain) {
return axis.domain
}
if (axis.type === 'linear') {
var xLimit = 12
return [-xLimit / 2, xLimit / 2]
} else if (axis.type === 'log') {
return [1, 10]
}
throw Error('axis type ' + axis.type + ' unsupported')
})(options.xAxis)
var yDomain = this.meta.yDomain = (function (axis) {
if (axis.domain) {
return axis.domain
}
var yLimit = computeYScale(xDomain)
if (axis.type === 'linear') {
return [-yLimit / 2, yLimit / 2]
} else if (axis.type === 'log') {
return [1, 10]
}
throw Error('axis type ' + axis.type + ' unsupported')
})(options.yAxis)
if (xDomain[0] >= xDomain[1]) {
throw Error('the pair defining the x-domain is inverted')
}
if (yDomain[0] >= yDomain[1]) {
throw Error('the pair defining the y-domain is inverted')
}
xScale = this.meta.xScale = d3.scale[options.xAxis.type]()
.domain(xDomain)
.range(options.xAxis.invert ? [width, 0] : [0, width])
yScale = this.meta.yScale = d3.scale[options.yAxis.type]()
.domain(yDomain)
.range(options.yAxis.invert ? [0, height] : [height, 0])
this.meta.xAxis = d3.svg.axis()
.scale(xScale)
.tickSize(options.grid ? -height : 0)
.tickFormat(format(xScale))
.orient('bottom')
this.meta.yAxis = d3.svg.axis()
.scale(yScale)
.tickSize(options.grid ? -width : 0)
.tickFormat(format(yScale))
.orient('left')
}
Chart.prototype.internalVars = function () {
// measurements and other derived data
this.meta = {}
margin = this.meta.margin = {left: 30, right: 30, top: 20, bottom: 20}
// margin = this.meta.margin = {left: 0, right: 0, top: 20, bottom: 20}
// if there's a title make the top margin bigger
if (options.title) {
this.meta.margin.top = 40
}
zoomBehavior = this.meta.zoomBehavior = d3.behavior.zoom()
// inner width/height
width = this.meta.width = (options.width || globals.DEFAULT_WIDTH) -
margin.left - margin.right
height = this.meta.height = (options.height || globals.DEFAULT_HEIGHT) -
margin.top - margin.bottom
this.initializeAxes()
}
Chart.prototype.drawGraphWrapper = function () {
var root = this.root = d3.select(options.target).selectAll('svg')
.data([options])
// enter
this.root.enter = root.enter()
.append('svg')
.attr('class', 'function-plot')
.attr('font-size', this.getFontSize())
// merge
root
.attr('width', width + margin.left + margin.right)
.attr('height', height + margin.top + margin.bottom)
this.buildTitle()
this.buildLegend()
this.buildCanvas()
this.buildClip()
this.buildAxis()
this.buildAxisLabel()
// draw each datum after the wrapper was set up
this.draw()
// helper to detect the closest fn to the cursor's current abscissa
var tip = this.tip = mousetip(extend(options.tip, { owner: this }))
this.canvas
.call(tip)
this.buildZoomHelper()
this.setUpPlugins()
}
Chart.prototype.buildTitle = function () {
// join
var selection = this.root.selectAll('text.title')
.data(function (d) {
return [d.title].filter(Boolean)
})
// enter
selection.enter()
.append('text')
.attr('class', 'title')
.attr('y', margin.top / 2)
.attr('x', margin.left + width / 2)
.attr('font-size', 25)
.attr('text-anchor', 'middle')
.attr('alignment-baseline', 'middle')
.text(options.title)
// exit
selection.exit().remove()
}
Chart.prototype.buildLegend = function () {
// enter
this.root.enter
.append('text')
.attr('class', 'top-right-legend')
.attr('text-anchor', 'end')
// update + enter
this.root.select('.top-right-legend')
.attr('y', margin.top / 2)
.attr('x', width + margin.left)
}
Chart.prototype.buildCanvas = function () {
var self = this
this.meta.zoomBehavior
.x(xScale)
.y(yScale)
.on('zoom', function onZoom () {
self.emit('all:zoom', d3.event.translate, d3.event.scale)
})
// enter
var canvas = this.canvas = this.root
.selectAll('.canvas')
.data(function (d) { return [d] })
this.canvas.enter = canvas.enter()
.append('g')
.attr('class', 'canvas')
// enter + update
}
Chart.prototype.buildClip = function () {
// (so that the functions don't overflow on zoom or drag)
var id = this.id
var defs = this.canvas.enter.append('defs')
defs.append('clipPath')
.attr('id', 'function-plot-clip-' + id)
.append('rect')
.attr('class', 'clip static-clip')
// enter + update
this.canvas.selectAll('.clip')
.attr('width', width)
.attr('height', height)
// marker clip (for vectors)
this.markerId = this.id + '-marker'
defs.append('clipPath')
.append('marker')
.attr('id', this.markerId)
.attr('viewBox', '0 -5 10 10')
.attr('refX', 10)
.attr('markerWidth', 5)
.attr('markerHeight', 5)
.attr('orient', 'auto')
.append('svg:path')
.attr('d', 'M0,-5L10,0L0,5L0,0')
.attr('stroke-width', '0px')
.attr('fill-opacity', 1)
.attr('fill', '#777')
}
Chart.prototype.buildAxis = function () {
// axis creation
var canvasEnter = this.canvas.enter
canvasEnter.append('g')
.attr('class', 'x axis')
canvasEnter.append('g')
.attr('class', 'y axis')
// update
this.canvas.select('.x.axis')
.attr('transform', 'translate(0,' + height + ')')
.call(this.meta.xAxis)
this.canvas.select('.y.axis')
.call(this.meta.yAxis)
}
Chart.prototype.buildAxisLabel = function () {
// axis labeling
var xLabel, yLabel
var canvas = this.canvas
xLabel = canvas.selectAll('text.x.axis-label')
.data(function (d) {
return [d.xAxis.label].filter(Boolean)
})
xLabel.enter()
.append('text')
.attr('class', 'x axis-label')
.attr('text-anchor', 'end')
xLabel
.attr('x', width)
.attr('y', height - 6)
.text(function (d) { return d })
xLabel.exit().remove()
yLabel = canvas.selectAll('text.y.axis-label')
.data(function (d) {
return [d.yAxis.label].filter(Boolean)
})
yLabel.enter()
.append('text')
.attr('class', 'y axis-label')
.attr('y', 6)
.attr('dy', '.75em')
.attr('text-anchor', 'end')
.attr('transform', 'rotate(-90)')
yLabel
.text(function (d) { return d })
yLabel.exit().remove()
}
/**
* @private
*
* Draws each of the datums stored in data.options, to do a full
* redraw call `instance.draw()`
*/
Chart.prototype.buildContent = function () {
var self = this
var canvas = this.canvas
canvas
.attr('transform', 'translate(' + margin.left + ',' + margin.top + ')')
.call(zoomBehavior)
.each(function () {
var el = d3.select(this)
// make a copy of all the listeners available to be removed/added later
var listeners = [
'mousedown',
'touchstart',
('onwheel' in document ?
'wheel' : 'ononmousewheel' in document ?
'mousewheel' :
'MozMousePixelScroll')
].map(function (d) { return d + '.zoom' })
if (!el._zoomListenersCache) {
listeners.forEach(function (l) {
el['_' + l] = el.on(l)
})
el._zoomListenersCache = true
}
function setState (state) {
listeners.forEach(function (l) {
state ? el.on(l, el['_' + l]) : el.on(l, null)
})
}
setState(!options.disableZoom)
})
var content = this.content = canvas.selectAll(':scope > g.content')
.data(function (d) { return [d] })
// g tag clipped to hold the data
content.enter()
.append('g')
.attr('clip-path', 'url(#function-plot-clip-' + this.id + ')')
.attr('class', 'content')
// helper line, x = 0
if (options.xAxis.type === 'linear') {
var yOrigin = content.selectAll(':scope > path.y.origin')
.data([ [[0, yScale.domain()[0]], [0, yScale.domain()[1]]] ])
yOrigin.enter()
.append('path')
.attr('class', 'y origin')
.attr('stroke', 'black')
.attr('opacity', 0.2)
yOrigin.attr('d', line)
}
// helper line y = 0
if (options.yAxis.type === 'linear') {
var xOrigin = content.selectAll(':scope > path.x.origin')
.data([ [[xScale.domain()[0], 0], [xScale.domain()[1], 0]] ])
xOrigin.enter()
.append('path')
.attr('class', 'x origin')
.attr('stroke', 'black')
.attr('opacity', 0.2)
xOrigin.attr('d', line)
}
// annotations
content
.call(annotations({ owner: self }))
// content construction
// - join options.data to <g class='graph'> elements
// - for each datum determine the sampler to use
var graphs = content.selectAll(':scope > g.graph')
.data(function (d) {
return d.data.map(datumDefaults)
})
// enter
graphs
.enter()
.append('g')
.attr('class', 'graph')
// enter + update
graphs
.each(function (d, index) {
// additional options needed in the graph-types/helpers
d.index = index
d3.select(this)
.call(graphTypes[d.graphType](self))
d3.select(this)
.call(helpers(self))
})
}
Chart.prototype.buildZoomHelper = function () {
// dummy rect (detects the zoom + drag)
var self = this
// enter
this.draggable = this.canvas.enter
.append('rect')
.attr('class', 'zoom-and-drag')
.style('fill', 'none')
.style('pointer-events', 'all')
// update
this.canvas.select('.zoom-and-drag')
.attr('width', width)
.attr('height', height)
.on('mouseover', function () {
self.emit('all:mouseover')
})
.on('mouseout', function () {
self.emit('all:mouseout')
})
.on('mousemove', function () {
self.emit('all:mousemove')
})
}
Chart.prototype.setUpPlugins = function () {
var plugins = options.plugins || []
var self = this
plugins.forEach(function (plugin) {
plugin(self)
})
}
Chart.prototype.addLink = function () {
for (var i = 0; i < arguments.length; i += 1) {
this.linkedGraphs.push(arguments[i])
}
}
Chart.prototype.updateAxes = function () {
var instance = this
var canvas = instance.canvas
canvas.select('.x.axis').call(instance.meta.xAxis)
canvas.select('.y.axis').call(instance.meta.yAxis)
// updates the style of the axes
canvas.selectAll('.axis path, .axis line')
.attr('fill', 'none')
.attr('stroke', 'black')
.attr('shape-rendering', 'crispedges')
.attr('opacity', 0.1)
}
Chart.prototype.syncOptions = function () {
// update the original options yDomain and xDomain
this.options.xAxis.domain = this.meta.xScale.domain()
this.options.yAxis.domain = this.meta.yScale.domain()
}
Chart.prototype.programmaticZoom = function (xDomain, yDomain) {
var instance = this
d3.transition()
.duration(750)
.tween('zoom', function () {
var ix = d3.interpolate(xScale.domain(), xDomain)
var iy = d3.interpolate(yScale.domain(), yDomain)
return function (t) {
zoomBehavior
.x(xScale.domain(ix(t)))
.y(yScale.domain(iy(t)))
instance.draw()
}
})
.each('end', function () {
instance.emit('programmatic-zoom')
})
}
Chart.prototype.getFontSize = function () {
return Math.max(Math.max(width, height) / 50, 8)
}
Chart.prototype.draw = function () {
var instance = this
instance.emit('before:draw')
instance.syncOptions()
instance.updateAxes()
instance.buildContent()
instance.emit('after:draw')
}
Chart.prototype.setUpEventListeners = function () {
var instance = this
var events = {
mousemove: function (coordinates) {
instance.tip.move(coordinates)
},
mouseover: function () {
instance.tip.show()
},
mouseout: function () {
instance.tip.hide()
},
zoom: function (translate, scale) {
zoomBehavior
.translate(translate)
.scale(scale)
},
'tip:update': function (x, y, index) {
var meta = instance.root.datum().data[index]
var title = meta.title || ''
var format = meta.renderer || function (x, y) {
return x.toFixed(3) + ', ' + y.toFixed(3)
}
var text = []
title && text.push(title)
text.push(format(x, y))
instance.root.select('.top-right-legend')
.attr('fill', globals.COLORS[index])
.text(text.join(' '))
}
}
var all = {
mousemove: function () {
var mouse = d3.mouse(instance.root.select('rect.zoom-and-drag').node())
var coordinates = {
x: xScale.invert(mouse[0]),
y: yScale.invert(mouse[1])
}
instance.linkedGraphs.forEach(function (graph) {
graph.emit('before:mousemove', coordinates)
graph.emit('mousemove', coordinates)
})
},
zoom: function (translate, scale) {
instance.linkedGraphs.forEach(function (graph, i) {
graph.emit('zoom', translate, scale)
graph.draw()
})
// emit the position of the mouse to all the registered graphs
instance.emit('all:mousemove')
}
}
Object.keys(events).forEach(function (e) {
instance.on(e, events[e])
// create an event for each event existing on `events` in the form 'all:' event
// e.g. all:mouseover all:mouseout
// the objective is that all the linked graphs receive the same event as the current graph
!all[e] && instance.on('all:' + e, function () {
var args = Array.prototype.slice.call(arguments)
instance.linkedGraphs.forEach(function (graph) {
var localArgs = args.slice()
localArgs.unshift(e)
graph.emit.apply(graph, localArgs)
})
})
})
Object.keys(all).forEach(function (e) {
instance.on('all:' + e, all[e])
})
}
var instance = cache[options.id]
if (!instance) {
instance = new Chart()
}
return instance.build()
}
globals = module.exports.globals = require('./globals')
graphTypes = module.exports.graphTypes = require('./graph-types/')
module.exports.plugins = require('./plugins/')
module.exports.eval = require('./helpers/eval')