henryjameslau · May 11, 2018 05:56
diff --git a/.block b/.block
 license: mit
diff --git a/README.md b/README.md
diff --git a/index.html b/index.html
 <!DOCTYPE html>
 <meta charset="utf-8">
 <style>

 .uk { fill: #cad9dc; }

 .place,
 .place-label {
  fill: #444;
 }

 h1, p, text {
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  pointer-events: none;
 }
  
  .dialoguebox {
    position: absolute;
    background-color: rgba(255,255,255,0.8);
    border: solid;
    border-color:#003C57;
    opacity:0;
    text-align:center;
  }

 </style>
 <body>
  <h1>Guess the halfway of the UK</h1>
  <p>Click a point on the map where there is an equal amount of land above the line as there is below<p>
 <script src="http://d3js.org/d3.v4.min.js"></script>
 <script src="https://d3js.org/d3-queue.v3.min.js"></script>
 <script src="https://unpkg.com/topojson@3"></script>
 <script src='https://npmcdn.com/@turf/turf/turf.min.js'></script>
 <script>

 d3.queue  

 d3.queue()
 .defer(d3.json, "uk.geo.json")
 .await(ready);
  
 function ready (error, uk){
  
 var width = parseInt(d3.select('body').style("width"));
    height = width*1.2;

 var projection = d3.geoAlbers()
    .center([0, 55.4])
    .rotate([4.4, 0])
    .parallels([50, 60])
    .scale(width * 6.4)
    .translate([width / 2, height / 2]);

 var path = d3.geoPath()
    .projection(projection)
    .pointRadius(2);

 var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);
  
 	svg.append('rect')
    .attr("class","guess")
    .attr("width",width)
    .attr("height",0)
    .style("fill","steelblue")

 	svg.selectAll(".uk")
      .data(uk.features)
    .enter().append("path")
      .attr("class", "uk" )
      .attr("d", path);
  
  svg.append('rect')
    .attr("class","dialogue")
    .style("stroke","red")
    .style("fill","white")
    .attr("height",height/10)
    .attr("width",width/4)
  	.attr("display","none")
  
  svg.append('line')
  .attr("class","guessline")
  .attr("x1",0)
  .attr("x2",width)
  .attr("y1",0)
  .attr("y1",0)
  .style("stroke","rgb(255,0,0)")
 	.style("stroke-width","2")
  .style("opacity",0)
  
  var box = d3.select('body').append("div")
    .attr('class', "dialoguebox" )
 		.style('position','absolute')
 		.style('width', width/4 + "px")
 		.style('height', height/10 + "px")
  	.style("opacity",0)
  	
  box.append('p').append("text").text("hello")
  box.append('button').attr("id","guessagain").text("Choose again")
  box.append('button').attr("id","reveal").text("Reveal the answer")
  
 	//break down the uk from multipolygons to individual polygons for turf
  ukb=uk.features[0].geometry.coordinates

  svg.on("click",function(){
    py = (d3.mouse(this))[1]
    
    d3.select('.guessline')
    	.attr("y1",py)
    	.attr("y2",py)
    	.style("opacity",1)
    
 		d3.select('.guess')
     	.transition().duration(2000).ease(d3.easeExp)
    	.attr("width",width)
    	.attr("height",py)
    
 		d3.select(".dialoguebox")
      .style('top', d3.mouse(this)[1]+height/20+"px")
 			.style('left', width/2+"px")
    	.style('opacity',1)
    
    

 	box1=[];
  boxcoords=[];
    
  topleft=projection.invert([0,0])
  topright=projection.invert([width,0])
  bottomleft=projection.invert([0,py])
  bottomright=projection.invert([width,py])
  
  boxcoords.push(topleft,topright,bottomright,bottomleft,topleft)
  box1.push(boxcoords)//turf needs double square brackets for coordinates
  poly1=turf.polygon(box1)//turn it into a geojson feature

  area=0;//set the area to zero before looping through all the areas looking for intersections and summing up the areas
 	for(i=0;i<ukb.length;i++){
    intersection = turf.intersect(poly1,turf.polygon(ukb[i]))
    if(intersection!=null){area=area+turf.area(intersection)}
  }
   console.log(area/turf.area(uk))
    
  })//end of on click 
  
  
  function guess(){
 		console.log("button pushed")
  }
  
 };//end of ready
  
 

 </script>
diff --git a/uk.geo.json b/uk.geo.json
diff --git a/uk.json b/uk.json
 {"type":"Topology","transform":{"scale":[0.001546403012701271,0.0010939367048704803],"translate":[-13.69131425699993,49.90961334800009]},"objects":{"subunits":{"type":"GeometryCollection","geometries":[{"type":"MultiPolygon","arcs":[[[0]],[[1]],[[2]],[[3]],[[4]],[[5]],[[6,7,8,9]]],"id":"ENG","properties":{"name":"England"}},{"type":"MultiPolygon","arcs":[[[10]],[[11]],[[12]],[[13]],[[14]],[[15]],[[16,17]]],"id":"IRL","properties":{"name":"Ireland"}},{"type":"MultiPolygon","arcs":[[[-17,18]],[[19]]],"id":"NIR","properties":{"name":"N. Ireland"}},{"type":"MultiPolygon","arcs":[[[20]],[[21]],[[22]],[[23]],[[24]],[[25]],[[26]],[[27]],[[28]],[[29]],[[30]],[[31]],[[32]],[[33]],[[34]],[[35]],[[36]],[[37]],[[38]],[[39]],[[40]],[[41]],[[42]],[[43]],[[44]],[[45]],[[46]],[[47]],[[48]],[[-9,49]],[[50]],[[51]],[[52]],[[53]],[[54]],[[55]],[[56]],[[57]],[[58]],[[59]],[[60]],[[61]],[[62]],[[63]],[[64]],[[65]],[[66]]],"id":"SCT","properties":{"name":"Scotland"}},{"type":"MultiPolygon","arcs":[[[67]],[[-7,68]],[[69]]],"id":"WLS","properties":{"name":"Wales"}}]},"places":{"type":"GeometryCollection","geometries":[{"type":"Point","coordinates":[5868,5065],"properties":{"name":"Ayr"}},{"type":"Point","coordinates":[7509,6637],"properties":{"name":"Aberdeen"}},{"type":"Point","coordinates":[6610,5933],"properties":{"name":"Perth"}},{"type":"Point","coordinates":[6914,5997],"properties":{"name":"Dundee"}},{"type":"Point","coordinates":[8058,4270],"properties":{"name":"Middlesbrough"}},{"type":"Point","coordinates":[7884,2295],"properties":{"name":"Coventry"}},{"type":"Point","coordinates":[7334,1348],"properties":{"name":"Bath"}},{"type":"Point","coordinates":[6571,723],"properties":{"name":"Exeter"}},{"type":"Point","coordinates":[8929,2094],"properties":{"name":"Cambridge"}},{"type":"Point","coordinates":[8640,3511],"properties":{"name":"Kingston upon 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diff --git a/uklowres.geo.json b/uklowres.geo.json
	<!DOCTYPE html>
	<meta charset="utf-8">
	<style>

	.uk { fill: #cad9dc; }

	.place,
	.place-label {
	fill: #444;
	}

	h1, p, text {
	font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
	pointer-events: none;
	}

	.dialoguebox {
	position: absolute;
	background-color: rgba(255,255,255,0.8);
	border: solid;
	border-color:#003C57;
	opacity:0;
	text-align:center;
	}

	</style>
	<body>
	<h1>Guess the halfway of the UK</h1>
	<p>Click a point on the map where there is an equal amount of land above the line as there is below<p>
	<script src="http://d3js.org/d3.v4.min.js"></script>
	<script src="https://d3js.org/d3-queue.v3.min.js"></script>
	<script src="https://unpkg.com/topojson@3"></script>
	<script src='https://npmcdn.com/@turf/turf/turf.min.js'></script>
	<script>

	d3.queue

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

	function ready (error, uk){

	var width = parseInt(d3.select('body').style("width"));
	height = width*1.2;

	var projection = d3.geoAlbers()
	.center([0, 55.4])
	.rotate([4.4, 0])
	.parallels([50, 60])
	.scale(width * 6.4)
	.translate([width / 2, height / 2]);

	var path = d3.geoPath()
	.projection(projection)
	.pointRadius(2);

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

	svg.append('rect')
	.attr("class","guess")
	.attr("width",width)
	.attr("height",0)
	.style("fill","steelblue")

	svg.selectAll(".uk")
	.data(uk.features)
	.enter().append("path")
	.attr("class", "uk" )
	.attr("d", path);

	svg.append('rect')
	.attr("class","dialogue")
	.style("stroke","red")
	.style("fill","white")
	.attr("height",height/10)
	.attr("width",width/4)
	.attr("display","none")

	svg.append('line')
	.attr("class","guessline")
	.attr("x1",0)
	.attr("x2",width)
	.attr("y1",0)
	.attr("y1",0)
	.style("stroke","rgb(255,0,0)")
	.style("stroke-width","2")
	.style("opacity",0)

	var box = d3.select('body').append("div")
	.attr('class', "dialoguebox" )
	.style('position','absolute')
	.style('width', width/4 + "px")
	.style('height', height/10 + "px")
	.style("opacity",0)

	box.append('p').append("text").text("hello")
	box.append('button').attr("id","guessagain").text("Choose again")
	box.append('button').attr("id","reveal").text("Reveal the answer")

	//break down the uk from multipolygons to individual polygons for turf
	ukb=uk.features[0].geometry.coordinates

	svg.on("click",function(){
	py = (d3.mouse(this))[1]

	d3.select('.guessline')
	.attr("y1",py)
	.attr("y2",py)
	.style("opacity",1)

	d3.select('.guess')
	.transition().duration(2000).ease(d3.easeExp)
	.attr("width",width)
	.attr("height",py)

	d3.select(".dialoguebox")
	.style('top', d3.mouse(this)[1]+height/20+"px")
	.style('left', width/2+"px")
	.style('opacity',1)



	box1=[];
	boxcoords=[];

	topleft=projection.invert([0,0])
	topright=projection.invert([width,0])
	bottomleft=projection.invert([0,py])
	bottomright=projection.invert([width,py])

	boxcoords.push(topleft,topright,bottomright,bottomleft,topleft)
	box1.push(boxcoords)//turf needs double square brackets for coordinates
	poly1=turf.polygon(box1)//turn it into a geojson feature

	area=0;//set the area to zero before looping through all the areas looking for intersections and summing up the areas
	for(i=0;i<ukb.length;i++){
	intersection = turf.intersect(poly1,turf.polygon(ukb[i]))
	if(intersection!=null){area=area+turf.area(intersection)}
	}
	console.log(area/turf.area(uk))

	})//end of on click


	function guess(){
	console.log("button pushed")
	}

	};//end of ready



	</script>