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/*
* function-plot
*
* Copyright (c) 2015 Mauricio Poppe
* Licensed under the MIT license.
*/
'use strict'
require('./lib/polyfills')
var d3 = window.d3
var events = require('events')
var extend = require('extend')
var mousetip = require('./lib/tip')
var utils = require('./lib/utils')
var helpers = require('./lib/helpers/')
var annotations = require('./lib/helpers/annotations')
var assert = utils.assert
var Const
var types
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 = letter + n.toString(16).substr(2)
this.linkedGraphs = [this]
this.options = options
options.id = this.id
cache[this.id] = this
this.setUpEventListeners()
}
Chart.prototype = Object.create(events.prototype)
Chart.prototype.update = function () {
this.setVars()
this.build()
return this
}
Chart.prototype.updateBounds = function () {
width = this.meta.width = (options.width || Const.DEFAULT_WIDTH) -
margin.left - margin.right
height = this.meta.height = (options.height || Const.DEFAULT_HEIGHT) -
margin.top - margin.bottom
var xDomain = this.meta.xDomain
var yDomain = this.meta.yDomain
xScale = this.meta.xScale = d3.scale.linear()
.domain(xDomain)
.range([0, width])
yScale = this.meta.yScale = d3.scale.linear()
.domain(yDomain)
.range([height, 0])
this.meta.xAxis = d3.svg.axis()
.scale(xScale)
.orient('bottom')
this.meta.yAxis = d3.svg.axis()
.scale(yScale)
.orient('left')
}
Chart.prototype.setVars = function () {
var limit = 10
this.meta = {}
margin = this.meta.margin = {left: 30, right: 30, top: 20, bottom: 20}
zoomBehavior = this.meta.zoomBehavior = d3.behavior.zoom()
var xDomain = this.meta.xDomain = options.xDomain || [-limit / 2, limit / 2]
var yDomain = this.meta.yDomain = options.yDomain || [-limit / 2, limit / 2]
assert(xDomain[0] < xDomain[1])
assert(yDomain[0] < yDomain[1])
if (options.title) {
this.meta.margin.top = 40
}
this.updateBounds()
}
Chart.prototype.build = 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()
this.buildContent()
// 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)
.scaleExtent([0.00001, Infinity])
.on('zoom', function onZoom () {
self.emit('all:zoom', xScale, yScale)
})
// 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)
}
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)
this.canvas.selectAll('.axis path, .axis line')
.attr('fill', 'none')
.attr('stroke', 'black')
.attr('shape-rendering', 'crispedges')
.attr('opacity', 0.1)
}
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.xLabel].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.yLabel].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()
}
Chart.prototype.buildContent = function () {
var self = this
var canvas = this.canvas
var content = this.content = canvas.selectAll('g.content')
.data(function (d) { return [d] })
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', 'mousewheel', 'mouseover', 'DOMMouseScroll', 'dblclick', 'wheel', 'MozMousePixelScroll']
listeners = listeners.map(function (l) { return l + '.zoom' })
if (!el._hasZoomListeners) {
listeners.forEach(function (l) {
el['_' + l] = el.on(l)
})
}
function setState (state) {
listeners.forEach(function (l) {
state ? el.on(l, el['_' + l]) : el.on(l, null)
})
}
setState(!options.disableZoom)
})
content.enter()
.append('g')
.attr('clip-path', 'url(#function-plot-clip-' + this.id + ')')
.attr('class', 'content')
// helper line, x = 0
var yOrigin = content.selectAll('path.y.origin')
.data([ [[0, yScale.domain()[0]], [0, yScale.domain()[1]]] ])
yOrigin.enter()
.append('path')
.attr('class', 'y origin')
.attr('stroke', '#eee')
yOrigin.attr('d', line)
// helper line y = 0
var xOrigin = content.selectAll('path.x.origin')
.data([ [[xScale.domain()[0], 0], [xScale.domain()[1], 0]] ])
xOrigin.enter()
.append('path')
.attr('class', 'x origin')
.attr('stroke', '#eee')
xOrigin.attr('d', line)
// annotations (parallel to the y-axis)
content
.call(annotations({ owner: self }))
// content construction (based on graphOptions)
// join
var graphs = content.selectAll('g.graph')
.data(function (d) { return d.data })
// enter
graphs
.enter()
.append('g')
.attr('class', 'graph')
// enter + update
graphs
.each(function (data, index) {
data.graphOptions = extend({
type: 'interval'
}, data.graphOptions)
// if the type of graph chosen is not `interval` then default the sampler to `mathjs`
var sampler = data.graphOptions.type !== 'interval'
? 'builtIn'
: 'interval'
data.graphOptions = extend({
sampler: sampler
}, data.graphOptions)
var options = extend({
owner: self,
index: index
}, data.graphOptions)
d3.select(this)
.call(types[options.type](options))
d3.select(this)
.call(helpers(options))
})
}
Chart.prototype.buildZoomHelper = function () {
// dummy rect (detects the zoom + drag)
var self = this
// enter
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)
}
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.updateAxes()
instance.emit('draw')
}
})
.each('end', function () {
instance.emit('programmatic-zoom')
})
}
Chart.prototype.getFontSize = function () {
return Math.max(Math.max(width, height) / 50, 8)
}
Chart.prototype.setUpEventListeners = function () {
var instance = this
var events = {
mousemove: function (x, y) {
instance.tip.move(x, y)
},
mouseover: function () {
instance.tip.show()
},
mouseout: function () {
instance.tip.hide()
},
draw: function () {
instance.buildContent()
},
'zoom:scaleUpdate': function (xOther, yOther) {
zoomBehavior
.x(xScale.domain(xOther.domain()))
.y(yScale.domain(yOther.domain()))
},
'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', Const.COLORS[index])
// .text(x.toFixed(3) + ', ' + y.toFixed(3))
.text(text.join(' '))
}
}
var all = {
mousemove: function () {
var mouse = d3.mouse(instance.root.select('rect.zoom-and-drag').node())
var x = xScale.invert(mouse[0])
var y = yScale.invert(mouse[1])
instance.linkedGraphs.forEach(function (graph) {
graph.emit('mousemove', x, y)
})
},
zoom: function (xScale, yScale) {
instance.linkedGraphs.forEach(function (graph, i) {
graph.updateAxes()
// the first element is the instance who fired the event,
// content draw
graph.emit('draw')
// since its scale was updated through d3.behavior.zoom
// we don't need to do it again
if (i) {
graph.emit('zoom:scaleUpdate', xScale, yScale)
}
})
// 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.update()
}
Const = module.exports.constants = require('./lib/constants')
types = module.exports.types = require('./lib/types/')
module.exports.plugins = require('./lib/plugins/')
module.exports.eval = require('./lib/helpers/eval')