malefs/README.md

## README.md

      
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              README.md
            
          
    Demonstrates using d3.behavior.zoom with a geographic projection. Based on an
example by Iain Dillingham.

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

path {
  fill: #E5F5F9;
  stroke: #2CA25F;
  stroke-width: 0.5;
}
#axes {
  stroke: #BDBDBD;
  stroke-width: 0.5;
}

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

var width = 960,
    height = 500,
    projection = d3.geo.mercator(),
    path = d3.geo.path().projection(projection);

var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height)
    .call(d3.behavior.zoom()
      .translate(projection.translate())
      .scale(projection.scale())
      .on("zoom", redraw));

var axes = svg.append("g").attr("id", "axes"),
    xAxis = axes.append("line").attr("y2", height),
    yAxis = axes.append("line").attr("x2", width);

d3.json("uk.json", function(error, json) {
  svg.selectAll("path")
      .data(json.features)
    .enter().append("path");
  redraw();
});

function redraw() {
  if (d3.event) {
    projection
        .translate(d3.event.translate)
        .scale(d3.event.scale);
  }
  svg.selectAll("path").attr("d", path);
  var t = projection.translate();
  xAxis.attr("x1", t[0]).attr("x2", t[0]);
  yAxis.attr("y1", t[1]).attr("y2", t[1]);
}

</script>

## uk.json

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

	path {
	fill: #E5F5F9;
	stroke: #2CA25F;
	stroke-width: 0.5;
	}
	#axes {
	stroke: #BDBDBD;
	stroke-width: 0.5;
	}

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

	var width = 960,
	height = 500,
	projection = d3.geo.mercator(),
	path = d3.geo.path().projection(projection);

	var svg = d3.select("body").append("svg")
	.attr("width", width)
	.attr("height", height)
	.call(d3.behavior.zoom()
	.translate(projection.translate())
	.scale(projection.scale())
	.on("zoom", redraw));

	var axes = svg.append("g").attr("id", "axes"),
	xAxis = axes.append("line").attr("y2", height),
	yAxis = axes.append("line").attr("x2", width);

	d3.json("uk.json", function(error, json) {
	svg.selectAll("path")
	.data(json.features)
	.enter().append("path");
	redraw();
	});

	function redraw() {
	if (d3.event) {
	projection
	.translate(d3.event.translate)
	.scale(d3.event.scale);
	}
	svg.selectAll("path").attr("d", path);
	var t = projection.translate();
	xAxis.attr("x1", t[0]).attr("x2", t[0]);
	yAxis.attr("y1", t[1]).attr("y2", t[1]);
	}

	</script>