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# Donut charts.
#
# @example
# Morris.Donut({
# el: $('#donut-container'),
# data: [
# { label: 'yin', value: 50 },
# { label: 'yang', value: 50 }
# ]
# });
class Morris.Donut extends Morris.EventEmitter
defaults:
colors: [
'#0B62A4'
'#3980B5'
'#679DC6'
'#95BBD7'
'#B0CCE1'
'#095791'
'#095085'
'#083E67'
'#052C48'
'#042135'
],
backgroundColor: '#FFFFFF',
labelColor: '#000000',
formatter: Morris.commas
resize: false
# Create and render a donut chart.
#
constructor: (options) ->
return new Morris.Donut(options) unless (@ instanceof Morris.Donut)
@options = $.extend {}, @defaults, options
if typeof options.element is 'string'
@el = $ document.getElementById(options.element)
else
@el = $ options.element
if @el == null || @el.length == 0
throw new Error("Graph placeholder not found.")
# bail if there's no data
if options.data is undefined or options.data.length is 0
return
@raphael = new Raphael(@el[0])
if @options.resize
$(window).bind 'resize', (evt) =>
if @timeoutId?
window.clearTimeout @timeoutId
@timeoutId = window.setTimeout @resizeHandler, 100
@setData options.data
# Clear and redraw the chart.
redraw: ->
@raphael.clear()
cx = @el.width() / 2
cy = @el.height() / 2
w = (Math.min(cx, cy) - 10) / 3
total = 0
total += value for value in @values
min = 5 / (2 * w)
C = 1.9999 * Math.PI - min * @data.length
last = 0
idx = 0
@segments = []
for value, i in @values
next = last + min + C * (value / total)
seg = new Morris.DonutSegment(
cx, cy, w*2, w, last, next,
@data[i].color || @options.colors[idx % @options.colors.length],
@options.backgroundColor, idx, @raphael)
seg.render()
@segments.push seg
seg.on 'hover', @select
seg.on 'click', @click
last = next
idx += 1
@text1 = @drawEmptyDonutLabel(cx, cy - 10, @options.labelColor, 15, 800)
@text2 = @drawEmptyDonutLabel(cx, cy + 10, @options.labelColor, 14)
max_value = Math.max @values...
idx = 0
for value in @values
if value == max_value
@select idx
break
idx += 1
setData: (data) ->
@data = data
@values = (parseFloat(row.value) for row in @data)
@redraw()
# @private
click: (idx) =>
@fire 'click', idx, @data[idx]
# Select the segment at the given index.
select: (idx) =>
s.deselect() for s in @segments
segment = @segments[idx]
segment.select()
row = @data[idx]
@setLabels(row.label, @options.formatter(row.value, row))
# @private
setLabels: (label1, label2) ->
inner = (Math.min(@el.width() / 2, @el.height() / 2) - 10) * 2 / 3
maxWidth = 1.8 * inner
maxHeightTop = inner / 2
maxHeightBottom = inner / 3
@text1.attr(text: label1, transform: '')
text1bbox = @text1.getBBox()
text1scale = Math.min(maxWidth / text1bbox.width, maxHeightTop / text1bbox.height)
@text1.attr(transform: "S#{text1scale},#{text1scale},#{text1bbox.x + text1bbox.width / 2},#{text1bbox.y + text1bbox.height}")
@text2.attr(text: label2, transform: '')
text2bbox = @text2.getBBox()
text2scale = Math.min(maxWidth / text2bbox.width, maxHeightBottom / text2bbox.height)
@text2.attr(transform: "S#{text2scale},#{text2scale},#{text2bbox.x + text2bbox.width / 2},#{text2bbox.y}")
drawEmptyDonutLabel: (xPos, yPos, color, fontSize, fontWeight) ->
text = @raphael.text(xPos, yPos, '')
.attr('font-size', fontSize)
.attr('fill', color)
text.attr('font-weight', fontWeight) if fontWeight?
return text
resizeHandler: =>
@timeoutId = null
@raphael.setSize @el.width(), @el.height()
@redraw()
# A segment within a donut chart.
#
# @private
class Morris.DonutSegment extends Morris.EventEmitter
constructor: (@cx, @cy, @inner, @outer, p0, p1, @color, @backgroundColor, @index, @raphael) ->
@sin_p0 = Math.sin(p0)
@cos_p0 = Math.cos(p0)
@sin_p1 = Math.sin(p1)
@cos_p1 = Math.cos(p1)
@is_long = if (p1 - p0) > Math.PI then 1 else 0
@path = @calcSegment(@inner + 3, @inner + @outer - 5)
@selectedPath = @calcSegment(@inner + 3, @inner + @outer)
@hilight = @calcArc(@inner)
calcArcPoints: (r) ->
return [
@cx + r * @sin_p0,
@cy + r * @cos_p0,
@cx + r * @sin_p1,
@cy + r * @cos_p1]
calcSegment: (r1, r2) ->
[ix0, iy0, ix1, iy1] = @calcArcPoints(r1)
[ox0, oy0, ox1, oy1] = @calcArcPoints(r2)
return (
"M#{ix0},#{iy0}" +
"A#{r1},#{r1},0,#{@is_long},0,#{ix1},#{iy1}" +
"L#{ox1},#{oy1}" +
"A#{r2},#{r2},0,#{@is_long},1,#{ox0},#{oy0}" +
"Z")
calcArc: (r) ->
[ix0, iy0, ix1, iy1] = @calcArcPoints(r)
return (
"M#{ix0},#{iy0}" +
"A#{r},#{r},0,#{@is_long},0,#{ix1},#{iy1}")
render: ->
@arc = @drawDonutArc(@hilight, @color)
@seg = @drawDonutSegment(
@path,
@color,
@backgroundColor,
=> @fire('hover', @index),
=> @fire('click', @index)
)
drawDonutArc: (path, color) ->
@raphael.path(path)
.attr(stroke: color, 'stroke-width': 2, opacity: 0)
drawDonutSegment: (path, fillColor, strokeColor, hoverFunction, clickFunction) ->
@raphael.path(path)
.attr(fill: fillColor, stroke: strokeColor, 'stroke-width': 3)
.hover(hoverFunction)
.click(clickFunction)
select: =>
unless @selected
@seg.animate(path: @selectedPath, 150, '<>')
@arc.animate(opacity: 1, 150, '<>')
@selected = true
deselect: =>
if @selected
@seg.animate(path: @path, 150, '<>')
@arc.animate(opacity: 0, 150, '<>')
@selected = false
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