vlandham/README.md

## README.md

      
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              README.md
            
          
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## index.html

<!-- Slight modification of example 1 on http://mtaptich.github.io/d3-lessons/d3-extras/ to add play/pause button.-->

<!DOCTYPE html>
<meta charset="utf-8">
<body>
<style>
.land {
  fill: #eee;
  stroke: #777777;
}

circle {
  fill: steelblue;
  stroke: #fff;
  stroke-width: 3px;
}

.journey{
  fill: none;
  stroke: #000;
  stroke-width: 4;
  stroke-dasharray: 4px,8px;
}
</style>

<h2>Map with Play/Pause Button on Path Code</h2>

<p>Original source (without play button) from <a href="http://mtaptich.github.io/d3-lessons/d3-extras/">mtaptich.github.io/d3-lessons/d3-extras</a>.</p>
<p>There is one strange bug in this: If you catch the ball on the starting point when you pause it, it takes a long time to start up again when you toggle "play/pause."</p>

<button>Play</button>

<div id="chart"></div>

<script src="http://d3js.org/d3.v3.min.js"></script>
<script src="http://d3js.org/topojson.v1.min.js"></script>
<script src="http://d3js.org/d3.geo.projection.v0.min.js"></script>
<script src="http://d3js.org/queue.v1.min.js"></script>
<script>

var width = 960,
    height = 500;

var projection = d3.geo.conicConformal()
    .rotate([98, 0])
    .center([0, 38])
    .parallels([29.5, 45.5])
    .scale(1000) // Change to 300 to zoom out
    .translate([width / 2, height / 2]);

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

var svg = d3.select("#chart").append("svg")
    .attr("width", width)
    .attr("height", height);

var points = [
  [-122.2728, 37.8717],
  [-104.9903, 39.7392],
  [-93.2650, 44.9778],
  [-75.6008, 41.0144],
  [-86.7833, 36.1667],
  [-96.7970, 32.7767],
  [-110.9264,32.2217]
];

var pauseValues = {
  lastTime: 0,
  currentTime: 0
};


// The x/y coordinates in the map scale are calculated by
// projection([d.long,d.lat]). So take the first for x, second for y.

var line = d3.svg.line()
    .interpolate("cardinal-closed")
    .x(function(d) { return projection(d)[0]; }) // lon
    .y(function(d) { return projection(d)[1]; }); // lat

queue()
    .defer(d3.json, "state_pol.json")
    .await(ready);

function ready (error, us) {
  svg.append("g")
      .attr("class", "land")
    .selectAll("path")
      .data(topojson.feature(us, us.objects.state_pol).features)
    .enter().append("path")
      .attr("class", function(d) {return d.id})
      .attr("d", path)

  var linepath = svg.append("path")
      .data([points])
      .attr("d", line)
      .attr('class', 'journey');

  svg.selectAll(".point")
      .data(points)
    .enter().append("circle")
      .attr("r", 8)
      .attr("transform", function(d) { return "translate(" + projection(d) + ")"; });

  var circle = svg.append("circle")
      .attr("r", 19)
      .attr("transform", "translate(" + projection(points[0]) + ")");

  d3.select("button").on("click",function(d, i){
      var button = d3.select(this);
      if (button.text() == "Pause") {
        button.text("Play");
        circle.transition()
          .duration(0);
        setTimeout(function() {
          pauseValues.lastTime = pauseValues.currentTime;
          },
        100);  // introduces a delay before resetting the times
      } else {
        button.text("Pause");
        transition();
      }
  });

  function transition() {
      circle.transition()
          .duration(5000)
          .ease("linear")
          .attrTween("transform", translateAlong(linepath.node()))
          .each("end", function() {
            pauseValues = {
              lastTime: 0,
              currentTime: 0
            };
          transition();
      });
  }

} // end of ready

// Returns an attrTween for translating along the specified path element.
function translateAlong(path) {
  var l = path.getTotalLength();
  return function(d, i, a) {
    return function(t) {
      //console.log('t:');
      //console.log(t);
      t += pauseValues.lastTime % 1.0;
      //console.log('lasttime');
      //console.log(pauseValues.lastTime);
      console.log('t:');
      console.log(t);
      //console.log('curtime');
      //console.log(pauseValues.currentTime);
      var p = path.getPointAtLength(t * l);
      pauseValues.currentTime = t;
      return "translate(" + p.x + "," + p.y + ")";
    };
  };
}

</script>

## state_pol.json

      
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              state_pol.json
            
          
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	<!-- Slight modification of example 1 on http://mtaptich.github.io/d3-lessons/d3-extras/ to add play/pause button.-->

	<!DOCTYPE html>
	<meta charset="utf-8">
	<body>
	<style>
	.land {
	fill: #eee;
	stroke: #777777;
	}

	circle {
	fill: steelblue;
	stroke: #fff;
	stroke-width: 3px;
	}

	.journey{
	fill: none;
	stroke: #000;
	stroke-width: 4;
	stroke-dasharray: 4px,8px;
	}
	</style>

	<h2>Map with Play/Pause Button on Path Code</h2>

	<p>Original source (without play button) from <a href="http://mtaptich.github.io/d3-lessons/d3-extras/">mtaptich.github.io/d3-lessons/d3-extras</a>.</p>
	<p>There is one strange bug in this: If you catch the ball on the starting point when you pause it, it takes a long time to start up again when you toggle "play/pause."</p>

	<button>Play</button>

	<div id="chart"></div>

	<script src="http://d3js.org/d3.v3.min.js"></script>
	<script src="http://d3js.org/topojson.v1.min.js"></script>
	<script src="http://d3js.org/d3.geo.projection.v0.min.js"></script>
	<script src="http://d3js.org/queue.v1.min.js"></script>
	<script>

	var width = 960,
	height = 500;

	var projection = d3.geo.conicConformal()
	.rotate([98, 0])
	.center([0, 38])
	.parallels([29.5, 45.5])
	.scale(1000) // Change to 300 to zoom out
	.translate([width / 2, height / 2]);

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

	var svg = d3.select("#chart").append("svg")
	.attr("width", width)
	.attr("height", height);

	var points = [
	[-122.2728, 37.8717],
	[-104.9903, 39.7392],
	[-93.2650, 44.9778],
	[-75.6008, 41.0144],
	[-86.7833, 36.1667],
	[-96.7970, 32.7767],
	[-110.9264,32.2217]
	];

	var pauseValues = {
	lastTime: 0,
	currentTime: 0
	};


	// The x/y coordinates in the map scale are calculated by
	// projection([d.long,d.lat]). So take the first for x, second for y.

	var line = d3.svg.line()
	.interpolate("cardinal-closed")
	.x(function(d) { return projection(d)[0]; }) // lon
	.y(function(d) { return projection(d)[1]; }); // lat

	queue()
	.defer(d3.json, "state_pol.json")
	.await(ready);

	function ready (error, us) {
	svg.append("g")
	.attr("class", "land")
	.selectAll("path")
	.data(topojson.feature(us, us.objects.state_pol).features)
	.enter().append("path")
	.attr("class", function(d) {return d.id})
	.attr("d", path)

	var linepath = svg.append("path")
	.data([points])
	.attr("d", line)
	.attr('class', 'journey');

	svg.selectAll(".point")
	.data(points)
	.enter().append("circle")
	.attr("r", 8)
	.attr("transform", function(d) { return "translate(" + projection(d) + ")"; });

	var circle = svg.append("circle")
	.attr("r", 19)
	.attr("transform", "translate(" + projection(points[0]) + ")");

	d3.select("button").on("click",function(d, i){
	var button = d3.select(this);
	if (button.text() == "Pause") {
	button.text("Play");
	circle.transition()
	.duration(0);
	setTimeout(function() {
	pauseValues.lastTime = pauseValues.currentTime;
	},
	100); // introduces a delay before resetting the times
	} else {
	button.text("Pause");
	transition();
	}
	});

	function transition() {
	circle.transition()
	.duration(5000)
	.ease("linear")
	.attrTween("transform", translateAlong(linepath.node()))
	.each("end", function() {
	pauseValues = {
	lastTime: 0,
	currentTime: 0
	};
	transition();
	});
	}

	} // end of ready

	// Returns an attrTween for translating along the specified path element.
	function translateAlong(path) {
	var l = path.getTotalLength();
	return function(d, i, a) {
	return function(t) {
	//console.log('t:');
	//console.log(t);
	t += pauseValues.lastTime % 1.0;
	//console.log('lasttime');
	//console.log(pauseValues.lastTime);
	console.log('t:');
	console.log(t);
	//console.log('curtime');
	//console.log(pauseValues.currentTime);
	var p = path.getPointAtLength(t * l);
	pauseValues.currentTime = t;
	return "translate(" + p.x + "," + p.y + ")";
	};
	};
	}

	</script>