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# Static bar chart implementation (using d3).
class Epoch.Chart.Bar extends Epoch.Chart.Plot
defaults =
type: 'bar'
style: 'grouped'
orientation: 'vertical'
padding:
bar: 0.08
group: 0.1
outerPadding:
bar: 0.08
group: 0.1
horizontal_specific =
tickFormats:
top: Epoch.Formats.si
bottom: Epoch.Formats.si
left: Epoch.Formats.regular
right: Epoch.Formats.regular
horizontal_defaults = Epoch.Util.defaults(horizontal_specific, defaults)
optionListeners =
'option:orientation': 'orientationChanged'
'option:padding': 'paddingChanged'
'option:outerPadding': 'paddingChanged'
'option:padding:bar': 'paddingChanged'
'option:padding:group': 'paddingChanged'
'option:outerPadding:bar': 'paddingChanged'
'option:outerPadding:group': 'paddingChanged'
constructor: (@options={}) ->
if @_isHorizontal()
@options = Epoch.Util.defaults(@options, horizontal_defaults)
else
@options = Epoch.Util.defaults(@options, defaults)
super(@options)
@onAll optionListeners
@draw()
# @return [Boolean] True if the chart is vertical, false otherwise
_isVertical: ->
@options.orientation == 'vertical'
# @return [Boolean] True if the chart is horizontal, false otherwise
_isHorizontal: ->
@options.orientation == 'horizontal'
# @return [Function] The scale used to generate the chart's x scale.
x: ->
if @_isVertical()
d3.scale.ordinal()
.domain(Epoch.Util.domain(@getVisibleLayers()))
.rangeRoundBands([0, @innerWidth()], @options.padding.group, @options.outerPadding.group)
else
extent = @extent((d) -> d.y)
extent[0] = Math.min(0, extent[0])
d3.scale.linear()
.domain(extent)
.range([0, @width - @margins.left - @margins.right])
# @return [Function] The x scale used to render the horizontal bar chart.
x1: (x0) ->
d3.scale.ordinal()
.domain((layer.category for layer in @getVisibleLayers()))
.rangeRoundBands([0, x0.rangeBand()], @options.padding.bar, @options.outerPadding.bar)
# @return [Function] The y scale used to render the bar chart.
y: ->
if @_isVertical()
extent = @extent((d) -> d.y)
extent[0] = Math.min(0, extent[0])
d3.scale.linear()
.domain(extent)
.range([@height - @margins.top - @margins.bottom, 0])
else
d3.scale.ordinal()
.domain(Epoch.Util.domain(@getVisibleLayers()))
.rangeRoundBands([0, @innerHeight()], @options.padding.group, @options.outerPadding.group)
# @return [Function] The x scale used to render the vertical bar chart.
y1: (y0) ->
d3.scale.ordinal()
.domain((layer.category for layer in @getVisibleLayers()))
.rangeRoundBands([0, y0.rangeBand()], @options.padding.bar, @options.outerPadding.bar)
# Remaps the bar chart data into a form that is easier to display.
# @return [Array] The reorganized data.
_remapData: ->
map = {}
for layer in @getVisibleLayers()
className = 'bar ' + layer.className.replace(/\s*layer\s*/, '')
for entry in layer.values
map[entry.x] ?= []
map[entry.x].push { label: layer.category, y: entry.y, className: className }
({group: k, values: v} for own k, v of map)
# Draws the bar char.
draw: ->
if @_isVertical()
@_drawVertical()
else
@_drawHorizontal()
super()
# Draws the bar chart with a vertical orientation
_drawVertical: ->
[x0, y] = [@x(), @y()]
x1 = @x1(x0)
height = @height - @margins.top - @margins.bottom
data = @_remapData()
# 1) Join
layer = @g.selectAll(".layer")
.data(data, (d) -> d.group)
# 2) Update
layer.transition().duration(750)
.attr("transform", (d) -> "translate(#{x0(d.group)}, 0)")
# 3) Enter / Create
layer.enter().append("g")
.attr('class', 'layer')
.attr("transform", (d) -> "translate(#{x0(d.group)}, 0)")
rects = layer.selectAll('rect')
.data((group) -> group.values)
rects.attr('class', (d) -> d.className)
rects.transition().duration(600)
.attr('x', (d) -> x1(d.label))
.attr('y', (d) -> y(d.y))
.attr('width', x1.rangeBand())
.attr('height', (d) -> height - y(d.y))
rects.enter().append('rect')
.attr('class', (d) -> d.className)
.attr('x', (d) -> x1(d.label))
.attr('y', (d) -> y(d.y))
.attr('width', x1.rangeBand())
.attr('height', (d) -> height - y(d.y))
rects.exit().transition()
.duration(150)
.style('opacity', '0')
.remove()
# 4) Update new and existing
# 5) Exit / Remove
layer.exit()
.transition()
.duration(750)
.style('opacity', '0')
.remove()
# Draws the bar chart with a horizontal orientation
_drawHorizontal: ->
[x, y0] = [@x(), @y()]
y1 = @y1(y0)
width = @width - @margins.left - @margins.right
data = @_remapData()
# 1) Join
layer = @g.selectAll(".layer")
.data(data, (d) -> d.group)
# 2) Update
layer.transition().duration(750)
.attr("transform", (d) -> "translate(0, #{y0(d.group)})")
# 3) Enter / Create
layer.enter().append("g")
.attr('class', 'layer')
.attr("transform", (d) -> "translate(0, #{y0(d.group)})")
rects = layer.selectAll('rect')
.data((group) -> group.values)
rects.attr('class', (d) -> d.className)
rects.transition().duration(600)
.attr('x', (d) -> 0)
.attr('y', (d) -> y1(d.label))
.attr('height', y1.rangeBand())
.attr('width', (d) -> x(d.y))
rects.enter().append('rect')
.attr('class', (d) -> d.className)
.attr('x', (d) -> 0)
.attr('y', (d) -> y1(d.label))
.attr('height', y1.rangeBand())
.attr('width', (d) -> x(d.y))
rects.exit().transition()
.duration(150)
.style('opacity', '0')
.remove()
# 4) Update new and existing
# 5) Exit / Remove
layer.exit()
.transition()
.duration(750)
.style('opacity', '0')
.remove()
# Generates specific tick marks to emulate d3's linear scale axis ticks
# for ordinal scales. Note: this should only be called if the user has
# defined a set number of ticks for a given axis.
# @param [Number] numTicks Number of ticks to generate
# @param [String] dataKey Property name of a datum to use for the tick value
# @return [Array] The ticks for the given axis
_getTickValues: (numTicks, dataKey='x') ->
return [] unless @data[0]?
total = @data[0].values.length
step = Math.ceil(total / numTicks)|0
tickValues = (@data[0].values[i].x for i in [0...total] by step)
# @return [Function] d3 axis to use for the bottom of the visualization.
bottomAxis: ->
axis = d3.svg.axis().scale(@x()).orient('bottom')
.ticks(@options.ticks.bottom)
.tickFormat(@options.tickFormats.bottom)
if @_isVertical() and @options.ticks.bottom?
axis.tickValues @_getTickValues(@options.ticks.bottom)
axis
# @return [Function] d3 axis to use for the top of the visualization.
topAxis: ->
axis = d3.svg.axis().scale(@x()).orient('top')
.ticks(@options.ticks.top)
.tickFormat(@options.tickFormats.top)
if @_isVertical() and @options.ticks.top?
axis.tickValues @_getTickValues(@options.ticks.top)
axis
# @return [Function] d3 axis to use on the left of the visualization.
leftAxis: ->
axis = d3.svg.axis().scale(@y()).orient('left')
.ticks(@options.ticks.left)
.tickFormat(@options.tickFormats.left)
if @_isHorizontal() and @options.ticks.left?
axis.tickValues @_getTickValues(@options.ticks.left)
axis
# @return [Function] d3 axis to use on the right of the visualization.
rightAxis: ->
axis = d3.svg.axis().scale(@y()).orient('right')
.ticks(@options.ticks.right)
.tickFormat(@options.tickFormats.right)
if @_isHorizontal() and @options.ticks.right?
axis.tickValues @_getTickValues(@options.ticks.right)
axis
# Updates orientation in response <code>option:orientation</code>.
orientationChanged: ->
top = @options.tickFormats.top
bottom = @options.tickFormats.bottom
left = @options.tickFormats.left
right = @options.tickFormats.right
@options.tickFormats.left = top
@options.tickFormats.right = bottom
@options.tickFormats.top = left
@options.tickFormats.bottom = right
@draw()
# Updates padding in response to <code>option:padding:*</code> and <code>option:outerPadding:*</code>.
paddingChanged: -> @draw()
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