Day 23 - Force SimulationDay 22 - Delaunay/VoronoiDay 20 - Animations Part 2Day 19 - InterpolatorsDay 18 - Join, Enter, Update, ExitDay 14 - Interactions 3 - DraggingDay 13 - Interactions 2 - Zooming25 days of D3Day 12 - Interactions 1 - Click and HoverDay 11 - Introduction to AnimationsDay 3 - Controlling the Flow of DataDay 10 - TreemapDay 9 - Stacked Bar ChartDay 8 - Scatter PlotDay 7 - A Line ChartDay 6 - Donut ChartDay 5 - Our First Bar ChartDay 4 - Groups, Attributes and StylesDay 2 - Scales, Shapes and ColorsDay 1 - One Shape, Many Shapes
Day 21 - Object Constancy
chart = {
const svg = d3.create('svg')
.attr('width', 500)
.attr('height', 500)
const hierarchy = d3.hierarchy(data)
.sum(d => d.value)
const pack = d3.pack()
.size([ 500, 500 ])
.padding( 3 )
const nodeData = pack( hierarchy ).leaves()
const color = d3.scaleOrdinal().range(d3.schemeSet2)
// all of our nodes, used to handle click events
let nodes
showAll()
return svg.node()
function showAll() {
const t = svg.transition()
.duration(1000)
nodes = svg.selectAll('g')
.data( nodeData, d => d.data.name )
.join(
enter => enter
.append('g')
.attr('class', d => 'depth-' + d.depth)
.attr('transform', d => `translate(${ d.x },${ d.y})`)
.style('opacity', 0)
.call(g => g.append('circle')
.attr('r', d => d.r)
.style('fill', d => color(d.data.group))
)
.call(g => g
.append('text')
.style('font-family', 'sans-serif')
.style('font-size', 10)
.attr('dy', '0.35em')
.attr('text-anchor', 'middle')
.text(d => d.data.name)
)
.call(g => g
.transition(t)
.style('opacity', 1)
),
update => update
.call(g => g
.transition(t)
.attr('transform', d => `translate(${ d.x },${ d.y})`)
)
.call(g => g
.select('circle')
.transition(t)
.attr('r', d => d.r)
)
.call(g => g
.select('text')
.transition(t)
.attr('x', 0)
),
exit => exit.remove()
).on('click', showSelected)
return nodes
}
function showSelected(e,d) {
const filteredData = nodeData.filter(node => node.data.group == d.data.group )
const t = svg.transition()
.duration(1000)
nodes
.data( filteredData, d => d.data.name )
.join(
enter => enter,
update => update
.call(g => g
.transition(t)
.attr('transform', (d,i) => `translate(${ 20 },${ 20 + i * 50 })`)
)
.call(g => g
.select('circle')
.transition(t)
.attr('r', 15)
)
.call(g => g
.select('text')
.transition(t)
.attr('x', 50)
)
.on('click', showAll),
exit => exit
.transition()
.style('opacity', 0)
.remove()
)
}
}
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