README.md

## README.md

      
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              README.md
            
          
    Experimenting with transitions on pattern fills. 

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

.state-patterned-stripey { fill: url(#stripey); }
.state-patterned-polkadot { fill: url(#polkadot); }

#stripey rect { stroke: none; fill: #ffa; }
#stripey path { stroke: #aff; }

#polkadot rect { stroke: none; fill: #aaf; }
#polkadot circle { fill: #faf; }


.state-boundary {
  fill: none;
  stroke: #000;
  stroke-width:1;
  stroke-linejoin:round;
  opacity:.2;
}

</style>
<body>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script src="http://d3js.org/topojson.v1.min.js"></script>
<script>

var width = 960,
    height = 500;

var patternSize = 20;

var projection = d3.geo.albersUsa()
    .scale(1000)
    .translate([width / 2, height / 2]);

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

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

var map = svg.append('g');

var defs = svg.append('defs');

var stripey  = newPattern('stripey',patternSize,defs);
var polkadot = newPattern('polkadot',patternSize,defs);

stripey.append('rect').attr({
  'x': -patternSize,
  'y': -patternSize,
  'height': patternSize*3,
  'width':  patternSize*3
})
stripey.append('path').attr({
  'd': 'M-10,10 l30,-30 M0,'+patternSize+' l'+patternSize+',-'+patternSize+' M'+(patternSize-10)+','+(patternSize+10)+' l30,-30'
})


polkadot.append('rect').attr({
  'x': -patternSize,
  'y': -patternSize,
  'height': patternSize*3,
  'width':  patternSize*3
})
polkadot.append('circle').attr({
  'r': 5,
  'cx':patternSize/2,
  'cy':patternSize/2
})

var patterns = ['stripey','polkadot']


d3.json("/mbostock/raw/4090846/us.json", function(error, us) {

  map.selectAll('path')
      .data(topojson.feature(us, us.objects.states).features)
      .enter().append("path")
      .attr("class", function(d) {
        var choice = Math.round(Math.random());
        return "state-patterned-"+patterns[choice]
      })
      .attr("d", path);

  map.append("path")
      .datum(topojson.mesh(us, us.objects.states, function(a, b) { return a !== b; }))
      .attr("class", "state-boundary")
      .attr("d", path);
});

d3.select('#stripey path').call(pulse,1000)
d3.select('#polkadot circle').call(spin,700)


function newPattern(name,size,defs) {
  return defs.append('pattern').attr({
    'id': name,
    'patternUnits':'userSpaceOnUse',
    'width': size,
    'height':size
    }).append('g');
}

function pulse(path,duration){
  path.transition()
      .duration(duration)
      .attr('stroke-width',12)
      .transition()
      .attr('stroke-width',2)

  setTimeout(function() { pulse(path, duration); }, duration*2);
}

function spin(path,duration) {
  path.transition()
    .duration(duration)
    .attr('transform','rotate(180,10,5)').attr('r',1)
    .transition()
    .attr('transform','rotate(0,10,5)').attr('r',4)

  setTimeout(function() { spin(path, duration); }, duration*2);
}

</script>