D3 map animation

README.md

Map animation in D3.

australia-states.json

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index.html

<!DOCTYPE html>
<meta charset="utf-8">
<style>

button {
    padding: 5px 8px;
    background: #eee;
    border: 1px solid #909090;
    border-radius: 4px;
    cursor: pointer;
}

input {
    width: 240px;
}

svg,
input {
    display: block;
}

path {
    fill: #4682b4;
    stroke: #3c6e99;
    transition: 0.2s;
}

.active {
    background: #ffa500;
    border-color: #d98c00;
    color: #fff;
    fill: #ffa500;
}


circle {
    fill: #ffd700;
}

</style>
<body>
    <button data-state="vic" data-coord="[144.96327999999994,-37.814107]">Go to Melbourne</button>
    <button data-state="nt" data-coord="[133.88061140000002,-23.7002104]">Go to Alice springs</button>
    <input type="range" min="1" max="100" value="50">
<script src="http://d3js.org/d3.v3.min.js"></script>
<script src="http://d3js.org/topojson.v1.min.js"></script>
<script>

// Size of the map
var size = 240
// Zoom level to see all Australia
var startScale = 330
// Zoom level when zoomed
var zoomedScale = 1330
// Transition duration
var duration = 400

var projection = d3.geo.mercator()
    .translate([size / 2, size / 2])
    .center([133, -27])
    .scale(startScale)

var path = d3.geo.path()
    .projection(projection)

var svg = d3.select('body').append('svg')
    .attr('width', size)
    .attr('height', size)

var rScale = d3.scale.linear()
    .range([1, 0, 1])
    .domain([0, .5, 1])

var states = null
var point = null
var range = 50
d3.json('australia-states.json', function(err, aus) {
    states = svg.append('g')
        .selectAll('path')
        .data(topojson.feature(aus, aus.objects.states).features)
        .enter().append('path')
            .attr('data-state', function(d) {
                return d.properties.code
            })
            .attr('d', path)

    point = svg.append('circle')
        .attr('r', 0)

    projection.scale(zoomedScale)

    // Go to a location
    d3.selectAll('button').on('click', clickButton)

    d3.select('input').on('input', inputRange)
})


function goTo(coord, state) {
    projection.center(coord)
    path.projection(projection)

    states
        .transition()
        .duration(duration)
            .attr('d', path)

    states.classed('active', false)
        .filter(function(d) {
            return d.properties.code === state
        })
        .classed('active', true)

    point.attr('transform', 'translate(' + projection(coord) + ')')
}

function changeRadius(changedCoord) {
    // Scientifically calculated
    r = range * zoomedScale / 5660.377358490566
    // 2 is the minimum radius
    r = d3.max([r, 2])
    if (point.attr('r') === '0') {
        point.transition()
            .delay(duration)
                .attr('r', r)
    } else if (changedCoord) {
        point
            .transition()
            .duration(duration)
                .attrTween('r', function() {
                    return function(t) {
                        return rScale(t) * r
                    }
                })
    } else {
        point.attr('r', r)
    }
}

// Events
function clickButton() {
    el = d3.select(this)
    // D3 doesn't have event delegation
    if (el.classed('active')) return

    d3.selectAll('button').classed('active', false)
    el.classed('active', true)
    coord = JSON.parse(this.dataset.coord)
    state = this.dataset.state
    goTo(coord, state)
    changeRadius(true)
}

function inputRange() {
    range = this.value
    changeRadius()
}

</script>
</body>
</html>

thumbnail.png