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# Rickshawgraph v0.1.2
class Dashing.Rickshawgraph extends Dashing.Widget
DIVISORS = [
{number: 100000000000000000000000, label: 'Y'},
{number: 100000000000000000000, label: 'Z'},
{number: 100000000000000000, label: 'E'},
{number: 1000000000000000, label: 'P'},
{number: 1000000000000, label: 'T'},
{number: 1000000000, label: 'G'},
{number: 1000000, label: 'M'},
{number: 1000, label: 'K'}
]
# Take a long number like "2356352" and turn it into "2.4M"
formatNumber = (number) ->
for divisior in DIVISORS
if number > divisior.number
number = "#{Math.round(number / (divisior.number/10))/10}#{divisior.label}"
break
return number
getRenderer: () -> return @get('renderer') or @get('graphtype') or 'area'
# Retrieve the `current` value of the graph.
@accessor 'current', ->
answer = null
# Return the value supplied if there is one.
if @get('displayedValue') != null and @get('displayedValue') != undefined
answer = @get('displayedValue')
if answer == null
# Compute a value to return based on the summaryMethod
series = @_parseData {points: @get('points'), series: @get('series')}
if !(series?.length > 0)
# No data in series
answer = ''
else
switch @get('summaryMethod')
when "sum"
answer = 0
answer += (point?.y or 0) for point in s.data for s in series
when "sumLast"
answer = 0
answer += s.data[s.data.length - 1].y or 0 for s in series
when "highest"
answer = 0
if @get('unstack') or (@getRenderer() is "line")
answer = Math.max(answer, (point?.y or 0)) for point in s.data for s in series
else
# Compute the sum of values at each point along the graph
for index in [0...series[0].data.length]
value = 0
for s in series
value += s.data[index]?.y or 0
answer = Math.max(answer, value)
when "none"
answer = ''
else
# Otherwise if there's only one series, pick the most recent value from the series.
if series.length == 1 and series[0].data?.length > 0
data = series[0].data
answer = data[data.length - 1].y
else
# Otherwise just return nothing.
answer = ''
answer = formatNumber answer
return answer
ready: ->
@assignedColors = @get('colors').split(':') if @get('colors')
@strokeColors = @get('strokeColors').split(':') if @get('strokeColors')
@graph = @_createGraph()
@graph.render()
clear: ->
# Remove the old graph/legend if there is one.
$node = $(@node)
$node.find('.rickshaw_graph').remove()
if @$legendDiv
@$legendDiv.remove()
@$legendDiv = null
# Handle new data from Dashing.
onData: (data) ->
series = @_parseData data
if @graph
# Remove the existing graph if the number of series has changed or any names have changed.
needClear = false
needClear |= (series.length != @graph.series.length)
if @get("legend") then for subseries, index in series
needClear |= @graph.series[index]?.name != series[index]?.name
if needClear then @graph = @_createGraph()
# Copy over the new graph data
for subseries, index in series
@graph.series[index] = subseries
@graph.render()
# Create a new Rickshaw graph.
_createGraph: ->
$node = $(@node)
$container = $node.parent()
@clear()
# Gross hacks. Let's fix this.
width = (Dashing.widget_base_dimensions[0] * $container.data("sizex")) + Dashing.widget_margins[0] * 2 * (($container.data("sizex") ? 1) - 1)
height = (Dashing.widget_base_dimensions[1] * $container.data("sizey")) + Dashing.widget_margins[1] * 2 * (($container.data("sizey") ? 1) - 1)
if @get("legend")
# Shave 20px off the bottom of the graph for the legend
height -= 20
$graph = $("")
$node.append $graph
series = @_parseData {points: @get('points'), series: @get('series')}
graphOptions = {
element: $graph.get(0),
renderer: @getRenderer(),
width: width,
height: height,
series: series
}
if !!@get('stroke') then graphOptions.stroke = true
if @get('min') != null then graphOptions.min = @get('min')
if @get('max') != null then graphOptions.max = @get('max')
try
graph = new Rickshaw.Graph graphOptions
catch err
nullsFound = false
if err.toString() is "x and y properties of points should be numbers instead of number and object"
# This will happen with older versions of Rickshaw that don't support nulls in the data set.
for s in series
for point in s.data
if point.y is null
nullsFound = true
point.y = 0
if nullsFound
# Try to create the graph again now that we've patched up the data.
graph = new Rickshaw.Graph graphOptions
if !@rickshawVersionWarning
console.log "#{@get 'id'} - Nulls were found in your data, but Rickshaw didn't like" +
" them. Consider upgrading your rickshaw to 1.4.3 or higher."
@rickshawVersionWarning = true
else
# No nulls were found - this is some other problem, so just re-throw the exception.
throw err
graph.renderer.unstack = !!@get('unstack')
xAxisOptions = {
graph: graph
}
if Rickshaw.Fixtures.Time.Local
xAxisOptions.timeFixture = new Rickshaw.Fixtures.Time.Local()
x_axis = new Rickshaw.Graph.Axis.Time xAxisOptions
y_axis = new Rickshaw.Graph.Axis.Y(graph: graph, tickFormat: Rickshaw.Fixtures.Number.formatKMBT)
if @get("legend")
# Add a legend
@$legendDiv = $("")
$node.append(@$legendDiv)
legend = new Rickshaw.Graph.Legend {
graph: graph
element: @$legendDiv.get(0)
}
return graph
# Parse a {series, points} object with new data from Dashing.
#
_parseData: (data) ->
series = []
# Figure out what kind of data we've been passed
if data.series
dataSeries = if isString(data.series) then JSON.parse data.series else data.series
for subseries, index in dataSeries
try
series.push @_parseSeries subseries
catch err
console.log "Error while parsing series: #{err}"
else if data.points
points = data.points
if isString(points) then points = JSON.parse points
if points[0]? and !points[0].x?
# Not already in Rickshaw format; assume graphite data
points = graphiteDataToRickshaw(points)
series.push {data: points}
if series.length is 0
# No data - create a dummy series to keep Rickshaw happy
series.push {data: [{x:0, y:0}]}
@_updateColors(series)
# Fix any missing data in the series.
if Rickshaw.Series.fill then Rickshaw.Series.fill(series, null)
return series
# Parse a series of data from an array passed to `_parseData()`.
# This accepts both Graphite and Rickshaw style data sets.
_parseSeries: (series) ->
if series?.datapoints?
# This is a Graphite series
answer = {
name: series.target
data: graphiteDataToRickshaw series.datapoints
color: series.color
stroke: series.stroke
}
else if series?.data?
# Rickshaw data. Need to clone, otherwise we could end up with multiple graphs sharing
# the same data, and Rickshaw really doesn't like that.
answer = {
name: series.name
data: series.data
color: series.color
stroke: series.stroke
}
else if !series
throw new Error("No data received for #{@get 'id'}")
else
throw new Error("Unknown data for #{@get 'id'}. series: #{series}")
answer.data.sort (a,b) -> a.x - b.x
return answer
# Update the color assignments for a series. This will assign colors to any data that
# doesn't have a color already.
_updateColors: (series) ->
# If no colors were provided, or of there aren't enough colors, then generate a set of
# colors to use.
if !@defaultColors or @defaultColors?.length != series.length
@defaultColors = computeDefaultColors @, @node, series
for subseries, index in series
# Preferentially pick supplied colors instead of defaults, but don't overwrite a color
# if one was supplied with the data.
subseries.color ?= @assignedColors?[index] or @defaultColors[index]
subseries.stroke ?= @strokeColors?[index] or "#000"
# Convert a collection of Graphite data points into data that Rickshaw will understand.
graphiteDataToRickshaw = (datapoints) ->
answer = []
for datapoint in datapoints
# Need to convert potential nulls from Graphite into a real number for Rickshaw.
answer.push {x: datapoint[1], y: (datapoint[0] or 0)}
answer
# Compute a pleasing set of default colors. This works by starting with the background color,
# and picking colors of intermediate luminance between the background and white (or the
# background and black, for light colored backgrounds.) We use the brightest color for the
# first series, because then multiple series will appear to blend in to the background.
computeDefaultColors = (self, node, series) ->
defaultColors = []
# Use a neutral color if we can't get the background-color for some reason.
backgroundColor = parseColor($(node).css('background-color')) or [50, 50, 50, 1.0]
hsl = rgbToHsl backgroundColor
alpha = if self.get('defaultAlpha')? then self.get('defaultAlpha') else 1
if self.get('colorScheme') in ['rainbow', 'near-rainbow']
saturation = (interpolate hsl[1], 1.0, 3)[1]
luminance = if (hsl[2] < 0.6) then 0.7 else 0.3
hueOffset = 0
if self.get('colorScheme') is 'rainbow'
# Note the first and last values in `hues` will both have the same hue as the background,
# hence the + 2.
hues = interpolate hsl[0], hsl[0] + 1, (series.length + 2)
hueOffset = 1
else
hues = interpolate hsl[0] - 0.25, hsl[0] + 0.25, series.length
for hue, index in hues
if hue > 1 then hues[index] -= 1
if hue < 0 then hues[index] += 1
for index in [0...series.length]
defaultColors[index] = rgbToColor hslToRgb([hues[index + hueOffset], saturation, luminance, alpha])
else
hue = if self.get('colorScheme') is "compliment" then hsl[0] + 0.5 else hsl[0]
if hsl[0] > 1 then hsl[0] -= 1
saturation = hsl[1]
saturationSource = if (saturation < 0.6) then 0.7 else 0.3
saturations = interpolate saturationSource, saturation, (series.length + 1)
luminance = hsl[2]
luminanceSource = if (luminance < 0.6) then 0.9 else 0.1
luminances = interpolate luminanceSource, luminance, (series.length + 1)
for index in [0...series.length]
defaultColors[index] = rgbToColor hslToRgb([hue, saturations[index], luminances[index], alpha])
return defaultColors
# Helper functions
# ================
isString = (obj) ->
return toString.call(obj) is "[object String]"
# Parse a `rgb(x,y,z)` or `rgba(x,y,z,a)` string.
parseRgbaColor = (colorString) ->
match = /^rgb\(\s*([\d]+)\s*,\s*([\d]+)\s*,\s*([\d]+)\s*\)/.exec(colorString)
if match
return [parseInt(match[1]), parseInt(match[2]), parseInt(match[3]), 1.0]
match = /^rgba\(\s*([\d]+)\s*,\s*([\d]+)\s*,\s*([\d]+)\s*,\s*([\d]+)\s*\)/.exec(colorString)
if match
return [parseInt(match[1]), parseInt(match[2]), parseInt(match[3]), parseInt(match[4])]
return null
# Parse a color string as RGBA
parseColor = (colorString) ->
answer = null
# Try to use the browser to parse the color for us.
div = document.createElement('div')
div.style.color = colorString
if div.style.color
answer = parseRgbaColor div.style.color
if !answer
match = /^#([\da-fA-F]{2})([\da-fA-F]{2})([\da-fA-F]{2})/.exec(colorString)
if match then answer = [parseInt(match[1], 16), parseInt(match[2], 16), parseInt(match[3], 16), 1.0]
if !answer
match = /^#([\da-fA-F])([\da-fA-F])([\da-fA-F])/.exec(colorString)
if match then answer = [parseInt(match[1], 16) * 0x11, parseInt(match[2], 16) * 0x11, parseInt(match[3], 16) * 0x11, 1.0]
if !answer then answer = parseRgbaColor colorString
return answer
# Convert an RGB or RGBA color to a CSS color.
rgbToColor = (rgb) ->
if (!3 of rgb) or (rgb[3] == 1.0)
return "rgb(#{rgb[0]},#{rgb[1]},#{rgb[2]})"
else
return "rgba(#{rgb[0]},#{rgb[1]},#{rgb[2]},#{rgb[3]})"
# Returns an array of size `steps`, where the first value is `source`, the last value is `dest`,
# and the intervening values are interpolated. If steps < 2, then returns `[dest]`.
#
interpolate = (source, dest, steps) ->
if steps < 2
answer =[dest]
else
stepSize = (dest - source) / (steps - 1)
answer = (num for num in [source..dest] by stepSize)
# Rounding errors can cause us to drop the last value
if answer.length < steps then answer.push dest
return answer
# Adapted from http://axonflux.com/handy-rgb-to-hsl-and-rgb-to-hsv-color-model-c
#
# Converts an RGBA color value to HSLA. Conversion formula
# adapted from http://en.wikipedia.org/wiki/HSL_color_space.
# Assumes r, g, and b are contained in the set [0, 255] and
# a in [0, 1]. Returns h, s, l, a in the set [0, 1].
#
# Returns the HSLA representation as an array.
rgbToHsl = (rgba) ->
[r,g,b,a] = rgba
r /= 255
g /= 255
b /= 255
max = Math.max(r, g, b)
min = Math.min(r, g, b)
l = (max + min) / 2
if max == min
h = s = 0 # achromatic
else
d = max - min
s = if l > 0.5 then d / (2 - max - min) else d / (max + min)
switch max
when r then h = (g - b) / d + (g < b ? 6 : 0)
when g then h = (b - r) / d + 2
when b then h = (r - g) / d + 4
h /= 6;
return [h, s, l, a]
# Adapted from http://axonflux.com/handy-rgb-to-hsl-and-rgb-to-hsv-color-model-c
#
# Converts an HSLA color value to RGBA. Conversion formula
# adapted from http://en.wikipedia.org/wiki/HSL_color_space.
# Assumes h, s, l, and a are contained in the set [0, 1] and
# returns r, g, and b in the set [0, 255] and a in [0, 1].
#
# Retunrs the RGBA representation as an array.
hslToRgb = (hsla) ->
[h,s,l,a] = hsla
if s is 0
r = g = b = l # achromatic
else
hue2rgb = (p, q, t) ->
if(t < 0) then t += 1
if(t > 1) then t -= 1
if(t < 1/6) then return p + (q - p) * 6 * t
if(t < 1/2) then return q
if(t < 2/3) then return p + (q - p) * (2/3 - t) * 6
return p
q = if l < 0.5 then l * (1 + s) else l + s - l * s
p = 2 * l - q;
r = hue2rgb(p, q, h + 1/3)
g = hue2rgb(p, q, h)
b = hue2rgb(p, q, h - 1/3)
return [Math.round(r * 255), Math.round(g * 255), Math.round(b * 255), a]
