reusable updating radarChart

Design based on original by NadiehBremer at Visual Cinnamon

Coding philosophy inspired by Rob Moore

See this block in production with Live Data

Find the Latest Code on GitHub

I figured out enter/exit/update for nested objects by studying Lee Mendelowitz's block and reviewing Mike's comments

Features:

• Separate layer for hover objects which need to remain on top of chart
• Separate layer for tooltip which needs to be uppermost layer
• Events are configurable as options such that external functions can be seamlessly integrated
• e.g. external tooltips can be configured for mouseover events

Accessors:

by default accessors with no parameters return current values

• chart.duration(transition-time) // duration of transitions
• chart.options(object) // many options don't have accessors
• chart.width(width)
• chart.height(height)
• chart.margins(object)
• chart.data(data) // set data
• chart.update() // update chart
• chart.maxValue(value) // maxValue of axis values
• chart.levels(value) // number of ring levels
• chart.opacity(value) // opacity of unselected areas
• chart.borderWidth(value) // width of border surrounding areas
• chart.rounded(true/false) // select rounded areas
• chart.events(object) -- chart.events({'legend': {'mouseover': null}})
• chart.color(d3.scale)
• chart.colors(object) -- chart.colors({'axis1': 'color1', 'axis2': 'color2'})

operations on data held in chart instance

• chart.pop()
• chart.push(row) -or- chart.push([row, row])
• chart.shift()
• chart.unshift(row) -or- chart.unshift([row, row])
• chart.slice(begin, end)

operations performed on data prior to display

• chart.invert(axis) -or- chart.invert([axis, axis]) // index or "axis label"
• chart.ranges({'axis': [min, max]})
• chart.filterAxes('axis') -or- chart.filterAxes(['axis', 'axis'])
• chart.filterAreas('key') -or- chart.filterAreas(['key1', 'key2'])

convenience

• chart.keys() // return a list of data keys
• chart.axes() // return labels of all axes
• chart.nodes() // return svg object