D3 Examples - d3-slippy: Constraining Zoom/Pan

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]}
​
var svg = d3.select("svg");
​
// Set up a slippy projection
var slippy = d3.geoSlippy()
 .tileSet(d3.tileSet.ESRI_OceanBasemap)
 .size(svg)
 .fitMargin(20,geojson);
 
// Set up a group to hold the tiles
var raster = svg.append("g"); 
​
// Set up a path generator
var path = d3.geoPath().projection(slippy.projection());
​
// Set zoom properties
var zoom = d3.zoom()
  .on("zoom",zoomed)
  .translateExtent(slippy.zoomTranslateConstrain())
  .scaleExtent([0.5,4]);
  
// Draw a path:
var uruguay = svg.append("path")
  .datum(geojson)
  .attr("d", path)
  .attr("fill","none")
  .attr("stroke","black")
  .attr("stroke-width",1);
​
// Call zoom and set initial zoom
svg
  .call(zoom)
  .call(zoom.transform, slippy.zoomIdentity());
​
// Apply zoom
function zoomed() {
  // Update projection.
  slippy.zoomTransform(d3.event.transform)
​
  // Update raster tiles:
  raster.call(slippy.tile);
  
  // Update the vector layer:
  uruguay.attr("d",path);
}
</script>
    