MicrowaveDev · December 17, 2019 21:26
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>
 <head>
  <meta charset="utf-8">
  <meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' />
  <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
  <script src="//d3js.org/topojson.v1.min.js"></script>
  <script src="viewport.js"></script>
  
  <script src='https://api.tiles.mapbox.com/mapbox-gl-js/v0.12.0/mapbox-gl.js'></script>
  <link href='https://api.tiles.mapbox.com/mapbox-gl-js/v0.12.0/mapbox-gl.css' rel='stylesheet' />

  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
    #map { 
      position:absolute; 
      width: 100%;
      height: 100%;
    }
    svg {
      position: absolute;
      width: 100%;
      height: 100%;
      pointer-events: none;
    }

    circle.mapbox {
      stroke: #111;
      fill-opacity: 0.1;
    }
    circle.vp {
      fill-opacity: 0.1;
      stroke: #111;
    }
    circle.d3 {
      fill-opacity: 0.1;
      stroke-width: 3;
      stroke: orange;
    }
  </style>
 </head>

 <body>
  <div id="map"></div>
  <svg id="overlay2"></svg>
  <script>
  
    mapboxgl.accessToken = 'pk.eyJ1IjoiZW5qYWxvdCIsImEiOiJjaWhtdmxhNTIwb25zdHBsejk0NGdhODJhIn0.2-F2hS_oTZenAWc0BMf_uw'
    
    //Setup mapbox-gl map
    var map = new mapboxgl.Map({
      container: 'map', // container id
      style: "mapbox://styles/mapbox/light-v9",
      center: [-0.1,51.5119112],
      zoom: 11.5,
      
    })
    //map.scrollZoom.disable()
    map.addControl(new mapboxgl.Navigation());

    // Setup our svg layer that we can manipulate with d3
    var container = map.getCanvasContainer()
    var svg = d3.select(container).append("svg")

    // we can project a lonlat coordinate pair using mapbox's built in projection function
    function mapboxProjection(lonlat) {
      var p = map.project(new mapboxgl.LngLat(lonlat[0], lonlat[1]))
      return [p.x, p.y];
    }

    // we can use viewport-mercator-project to get projection and unprojection functions
    function getVP() {
      var bbox = document.body.getBoundingClientRect();
      var center = map.getCenter();
      var zoom = map.getZoom();
      var vp = ViewportMercator({
        longitude: center.lng,
        latitude: center.lat,
        zoom: zoom,
        width: bbox.width,
        height: bbox.height,
      })
      return vp;
    }
    
    
    // we calculate the scale given mapbox state (derived from viewport-mercator-project's code)
    // to define a d3 projection
    function getD3() {
      var bbox = document.body.getBoundingClientRect();
      var center = map.getCenter();
      var zoom = map.getZoom();
      // 512 is hardcoded tile size, might need to be 256 or changed to suit your map config
      var scale = (512) * 0.5 / PI * pow(2, zoom);

      var d3projection = d3.geo.mercator()
        .center([center.lng, center.lat])
        .translate([bbox.width/2, bbox.height/2])
        .scale(scale);

      return d3projection;
    }
    
    // calculate the original viewport-mercator-project projection
    var vp = getVP();
        
    // calculate the original d3 projection
    var d3Projection = getD3()
    
    // we want to render the same point
    var point = [-0.1,51.5119112]
  
    var mapboxCircle = svg.append("circle").classed("mapbox", true)
    var vpCircle = svg.append("circle").classed("vp", true)
    var d3Circle = svg.append("circle").classed("d3", true)

    // you can use any of these projections to create a d3.geo.path
    // function for rendering lines and polygons
    /*
    var path = d3.geo.path()
      .projection(mapboxProjection)
    */
    /*
    var path = d3.geo.path()
      .projection(d3Projection)
    */

    function render() {
      
      // we update our calculated projections whenever the underlying map changes 
      // due to zoom and pan
      vp = getVP();
      d3Projection = getD3();

      mapboxCircle.attr({
        cx: mapboxProjection(point)[0],
        cy: mapboxProjection(point)[1],
        r: 15// * currentScale
      })

      vpCircle.attr({
        cx: vp.project(point)[0],
        cy: vp.project(point)[1],
        r: 20// * currentScale
      })

      d3Circle.attr({
        cx: d3Projection(point)[0],
        cy: d3Projection(point)[1],
        r: 25// * currentScale
      })
    }

    // re-render our visualization whenever the view changes
    map.on("viewreset", function() {
      render()
    })
    map.on("move", function() {
      render()
    })

    // render our initial visualization
    render()

    
  </script>
 </body>
	<!DOCTYPE html>
	<head>
	<meta charset="utf-8">
	<meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' />
	<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
	<script src="//d3js.org/topojson.v1.min.js"></script>
	<script src="viewport.js"></script>

	<script src='https://api.tiles.mapbox.com/mapbox-gl-js/v0.12.0/mapbox-gl.js'></script>
	<link href='https://api.tiles.mapbox.com/mapbox-gl-js/v0.12.0/mapbox-gl.css' rel='stylesheet' />

	<style>
	body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
	#map {
	position:absolute;
	width: 100%;
	height: 100%;
	}
	svg {
	position: absolute;
	width: 100%;
	height: 100%;
	pointer-events: none;
	}

	circle.mapbox {
	stroke: #111;
	fill-opacity: 0.1;
	}
	circle.vp {
	fill-opacity: 0.1;
	stroke: #111;
	}
	circle.d3 {
	fill-opacity: 0.1;
	stroke-width: 3;
	stroke: orange;
	}
	</style>
	</head>

	<body>
	<div id="map"></div>
	<svg id="overlay2"></svg>
	<script>

	mapboxgl.accessToken = 'pk.eyJ1IjoiZW5qYWxvdCIsImEiOiJjaWhtdmxhNTIwb25zdHBsejk0NGdhODJhIn0.2-F2hS_oTZenAWc0BMf_uw'

	//Setup mapbox-gl map
	var map = new mapboxgl.Map({
	container: 'map', // container id
	style: "mapbox://styles/mapbox/light-v9",
	center: [-0.1,51.5119112],
	zoom: 11.5,

	})
	//map.scrollZoom.disable()
	map.addControl(new mapboxgl.Navigation());

	// Setup our svg layer that we can manipulate with d3
	var container = map.getCanvasContainer()
	var svg = d3.select(container).append("svg")

	// we can project a lonlat coordinate pair using mapbox's built in projection function
	function mapboxProjection(lonlat) {
	var p = map.project(new mapboxgl.LngLat(lonlat[0], lonlat[1]))
	return [p.x, p.y];
	}

	// we can use viewport-mercator-project to get projection and unprojection functions
	function getVP() {
	var bbox = document.body.getBoundingClientRect();
	var center = map.getCenter();
	var zoom = map.getZoom();
	var vp = ViewportMercator({
	longitude: center.lng,
	latitude: center.lat,
	zoom: zoom,
	width: bbox.width,
	height: bbox.height,
	})
	return vp;
	}


	// we calculate the scale given mapbox state (derived from viewport-mercator-project's code)
	// to define a d3 projection
	function getD3() {
	var bbox = document.body.getBoundingClientRect();
	var center = map.getCenter();
	var zoom = map.getZoom();
	// 512 is hardcoded tile size, might need to be 256 or changed to suit your map config
	var scale = (512) * 0.5 / PI * pow(2, zoom);

	var d3projection = d3.geo.mercator()
	.center([center.lng, center.lat])
	.translate([bbox.width/2, bbox.height/2])
	.scale(scale);

	return d3projection;
	}

	// calculate the original viewport-mercator-project projection
	var vp = getVP();

	// calculate the original d3 projection
	var d3Projection = getD3()

	// we want to render the same point
	var point = [-0.1,51.5119112]

	var mapboxCircle = svg.append("circle").classed("mapbox", true)
	var vpCircle = svg.append("circle").classed("vp", true)
	var d3Circle = svg.append("circle").classed("d3", true)

	// you can use any of these projections to create a d3.geo.path
	// function for rendering lines and polygons
	/*
	var path = d3.geo.path()
	.projection(mapboxProjection)
	*/
	/*
	var path = d3.geo.path()
	.projection(d3Projection)
	*/

	function render() {

	// we update our calculated projections whenever the underlying map changes
	// due to zoom and pan
	vp = getVP();
	d3Projection = getD3();

	mapboxCircle.attr({
	cx: mapboxProjection(point)[0],
	cy: mapboxProjection(point)[1],
	r: 15// * currentScale
	})

	vpCircle.attr({
	cx: vp.project(point)[0],
	cy: vp.project(point)[1],
	r: 20// * currentScale
	})

	d3Circle.attr({
	cx: d3Projection(point)[0],
	cy: d3Projection(point)[1],
	r: 25// * currentScale
	})
	}

	// re-render our visualization whenever the view changes
	map.on("viewreset", function() {
	render()
	})
	map.on("move", function() {
	render()
	})

	// render our initial visualization
	render()


	</script>
	</body>