Fil/.block

## .block
license: mit

## README.md

      
    Raw
  

              README.md
            
          
    For @ozanyusufoglu
Some polygons (shown in yellow) have an inverse winding order.
Built with blockbuilder.org
forked from ozanyusufoglu's block: winding problem

  
## index.html
<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
  </style>
</head>

<body>
  <script>


var width = 960,
  height = 500;


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

d3.json('istanbul.geojson', function(error,json) {


var projection = d3.geoMercator();

var path = d3.geoPath().projection(projection)
  json.features.forEach(item => {
    if (d3.geoArea(item)> 2 * Math.PI) {
      item.geometry.coordinates = item.geometry.coordinates.map(f => f.map(e => e.reverse()));
      item.properties.error = true;
    }
  })

projection.fitExtent([[0,0],[width,height]], json);


  svg.selectAll("path").data(json.features)
                        .enter()
                        .append("path")
                        .style("fill", d => d.properties.error ? "yellow" : "lightblue")
                        .style("stroke","black")
                        .style('opacity', '0.1')
                        .style("stroke-width","2")
                        .attr("d", path)

  })


  </script>
</body>

## istanbul.geojson

      
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              istanbul.geojson
            
          
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## thumbnail.png

      
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              thumbnail.png
	<!DOCTYPE html>
	<head>
	<meta charset="utf-8">
	<script src="https://d3js.org/d3.v4.min.js"></script>
	<style>
	body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
	</style>
	</head>

	<body>
	<script>


	var width = 960,
	height = 500;


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

	d3.json('istanbul.geojson', function(error,json) {


	var projection = d3.geoMercator();

	var path = d3.geoPath().projection(projection)
	json.features.forEach(item => {
	if (d3.geoArea(item)> 2 * Math.PI) {
	item.geometry.coordinates = item.geometry.coordinates.map(f => f.map(e => e.reverse()));
	item.properties.error = true;
	}
	})

	projection.fitExtent([[0,0],[width,height]], json);




	svg.selectAll("path").data(json.features)
	.enter()
	.append("path")
	.style("fill", d => d.properties.error ? "yellow" : "lightblue")
	.style("stroke","black")
	.style('opacity', '0.1')
	.style("stroke-width","2")
	.attr("d", path)

	})


	</script>
	</body>