curran · July 16, 2018 19:19 · tyrasd · Sep 9, 2015 · curran · Sep 9, 2015
diff --git a/README.md b/README.md
diff --git a/chiasm-leaflet.js b/chiasm-leaflet.js

 // This is an example Chaism plugin that uses Leaflet.js.
 function ChiasmLeaflet() {

  var my = ChiasmComponent({
    center: [0, 0],
    zoom: 2
  });

  // This line of code lets you see what the center value is when you pan in the map.
  //my.when("center", console.log, console);

  // Expose a div element that will be added to the Chiasm container.
  // This is a special property that Chiasm looks for after components are constructed.
  my.el = document.createElement("div");

  // When you zoom out all the way, this line makes the background black
  // (by default it is gray).
  d3.select(my.el).style("background-color", "black");

  // Instantiate the Leaflet map, see docs at
  // http://leafletjs.com/reference.html#map-constructor
  my.map = L.map(my.el, {

    // Turn off the "Leaflet" link in the lower right corner.
    // Leaflet is properly attributed in the README.
    attributionControl: false

  }).setView(my.center, my.zoom);

  // Add the black & white style map layer.
  // Found by browsing http://leaflet-extras.github.io/leaflet-providers/preview/
  // TODO move this to configuration.
  L.tileLayer("http://stamen-tiles-{s}.a.ssl.fastly.net/toner/{z}/{x}/{y}.png").addTo(my.map);

  // Also try this http://{s}.tiles.earthatlas.info/natural-earth/{z}/{x}/{y}.png

  // Returns the current Leaflet map center
  // in a format that D3 understands: [longitude, latitude]
  function getCenter(){
    var center = my.map.getCenter();
    return [center.lng, center.lat];
  }

  // Sets the Leaflet map center to be the given center.
  // Note that Leaflet will immediately trigger a "move"
  // event
  function setCenter(center){
    my.map.off("move", onMove);
    my.map.panTo(L.latLng(center[1], center[0]), {
      animate: false
    });
    my.map.on("move", onMove);
  }

  my.map.on("move", onMove);

  function onMove(){
    my.center = getCenter();
    my.zoom = my.map.getZoom();
  }

  // If the center or zoom was set externally, update the map accordingly.
  my.when("center", setCenter);
  my.when("zoom", my.map.setZoom, my.map);

  my.when("box", function (box) {

    // Move to chiasm-layout?
    d3.select(my.el)
      .style("width", box.width + "px")
      .style("height", box.height + "px");

    // Tell Leaflet that the size has changed so it updates.
    my.map.invalidateSize();
  });

  return my;
 }
diff --git a/globe.js b/globe.js
 // This is an example Chiasm plugin based on this D3 Canvas example:
 // http://bl.ocks.org/mbostock/ba63c55dd2dbc3ab0127
 function Globe (){

  var my = ChiasmComponent({
    backgroundColor: "black",
    foregroundColor: "white",
    center: [0, 0],
    zoom: 1,
    sens: 0.25
  });

  var canvas = document.createElement("canvas");
  var context = canvas.getContext("2d");
  
  var projection = d3.geo.orthographic()
    .clipAngle(90);

  var path = d3.geo.path()
    .projection(projection)
    .context(context);

  // Interaction that lets the user rotate the globe.
  // Draws from http://bl.ocks.org/KoGor/5994804
  d3.select(canvas)
    .call(d3.behavior.drag()
      .origin(function() {
        var r = projection.rotate();
        return {
          x: r[0] / my.sens,
          y: -r[1] / my.sens
        };
      })
      .on("drag", function() {
        var lng = -d3.event.x * my.sens;
        var lat = d3.event.y * my.sens;
        
        // Disallow rotation beyond the poles.
        lat = lat > 89 ? 89 : lat < -89 ? -89 : lat;

        my.center = [ lng, lat ];
      }));


  // Hand off the DOM element to the Chiasm layout plugin, which will inject it
  // into the parent container for us when we specify the special property `el`.
  my.el = canvas;

  // The following will all change at runtime, but they are set to some value to
  // handle the case that the render function gets run before they are updated.
  my.box = {
    width: 960,
    height: 600
  };
  my.radius = my.box.height / 2 - 5;
  my.scale = my.radius;
  my.cosLat = 1;

  my.when("box", function (box){
    canvas.width = box.width;
    canvas.height = box.height;
    projection.translate([box.width / 2, box.height / 2]);
    my.radius = box.height / 2 - 5;
  });

  my.when("radius", function (radius){
    my.scale = radius;
  });

  my.when("scale", function (scale){
    projection.scale(my.scale);
  });

  my.when("center", function (center){
    var lat = center[1];
    my.cosLat = Math.cos(toRadians(lat));

    my.rotate = [ -center[0], -center[1] ];
  });

  my.when("rotate", function (rotate){
    projection.rotate(rotate);
  });

  function toRadians(deg){
    return deg / 180 * Math.PI;
  }

  d3.json("world-110m.json", function(error, world) {
    if (error) throw error;

    var land = topojson.feature(world, world.objects.land);

    d3.timer(function(elapsed) {
      context.fillStyle = my.backgroundColor;
      context.fillRect(0, 0, my.box.width, my.box.height);

      context.fillStyle = my.foregroundColor;
      context.strokeStyle = my.foregroundColor;

      context.beginPath();
      path(land);
      context.fill();

      // This constant was tweaked such that the circle on the globe
      // roughly matches the viewport in the Leaflet map.
      var constant = 800;

      // Compute the size of the current viewport on the globe.
      // Draws from formula found at
      // http://wiki.openstreetmap.org/wiki/Zoom_levels
      var currentViewRadius = constant * my.box.height * my.cosLat / (Math.pow(2, my.zoom + 8));

      // Stop the code from crashing with transient states that happen on page load.
      currentViewRadius = currentViewRadius < 1 ? 1 : currentViewRadius;
      var radius = my.radius < 1 ? 1 : my.radius;

      context.beginPath();
      context.arc(my.box.width / 2, my.box.height / 2, radius, 0, 2 * Math.PI, true);
      context.lineWidth = 2.5;
      context.stroke();


      // This makes the circle invert whatever color is underneath it.
      context.save();
      context.globalCompositeOperation = "difference";
      context.strokeStyle = "white";

      // Draw the circle that represents the current zoom and pan.
      context.beginPath();
      context.arc(my.box.width / 2, my.box.height / 2, currentViewRadius, 0, 2 * Math.PI, true);
      context.lineWidth = 2.5;
      context.stroke();

      // This is the inverse of context.save(), it pops off the context stack so
      // we get back whatever the previous value was for
      // globalCompositeOperation.
      context.restore();
    });
  });

  return my;
 }
diff --git a/index.html b/index.html
 <!DOCTYPE html>
 <html>
  <head>
    <meta charset="utf-8">
    <title>Map & Globe</title>

    <script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/3.10.1/lodash.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/topojson/1.6.19/topojson.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.6/d3.min.js"></script>

    <!-- Leaflet.js, a geographic mapping library. -->
    <link rel="stylesheet" href="http://cdn.leafletjs.com/leaflet-0.7.5/leaflet.css" /> 
    <script src="http://cdn.leafletjs.com/leaflet-0.7.5/leaflet.js"></script>

    <!-- A functional reactive model library. github.com/curran/model -->
    <script src="http://curran.github.io/model/cdn/model-v0.2.4.js"></script>

    <!-- Chiasm core and plugins. github.com/chiasm-project -->
    <script src="http://chiasm-project.github.io/chiasm/chiasm-v0.2.0.js"></script>
    <script src="http://chiasm-project.github.io/chiasm-component/chiasm-component-v0.2.0.js"></script>
    <script src="http://chiasm-project.github.io/chiasm-layout/chiasm-layout-v0.2.1.js"></script>
    <script src="http://chiasm-project.github.io/chiasm-links/chiasm-links-v0.2.1.js"></script>

    <!-- Custom Chiasm plugins for this example. -->
    <script src="globe.js"></script>
    <script src="chiasm-leaflet.js"></script>

    <style>

      body {
        background-color: black;
      }

      /* Make the container fill the page using CSS. */
      #chiasm-container {
        position: fixed;
        left: 20px;
        right: 20px;
        top: 20px;
        bottom: 20px;
      }
    </style>

  </head>
  <body>
    <div id="chiasm-container"></div>

    <script>

      var chiasm = Chiasm();

      chiasm.plugins.layout = ChiasmLayout;
      chiasm.plugins.links = ChiasmLinks;
      chiasm.plugins.globe = Globe;
      chiasm.plugins.leaflet = ChiasmLeaflet;

      chiasm.setConfig({
        "layout": {
          "plugin": "layout",
          "state": {
            "containerSelector": "#chiasm-container",
            "layout": {
              "orientation": "horizontal",
              "children": [
                "leafletMap",
                "d3Globe",
              ]
            }
          }
        },
        "leafletMap": {
          "plugin": "leaflet",
          "state": {
            "center": [-4.592, 39.859],
            "zoom": 5
          }
        },
        "d3Globe": {
          "plugin": "globe"
        },
        "links": {
          "plugin": "links",
          "state": {
            "bindings": [
              "leafletMap.zoom -> d3Globe.zoom",
              "leafletMap.center <-> d3Globe.center"
            ]
          }
        }
      });
    
    </script>
  </body>
 </html>
diff --git a/thumbnail.png b/thumbnail.png
diff --git a/world-110m.json b/world-110m.json

	// This is an example Chaism plugin that uses Leaflet.js.
	function ChiasmLeaflet() {

	var my = ChiasmComponent({
	center: [0, 0],
	zoom: 2
	});

	// This line of code lets you see what the center value is when you pan in the map.
	//my.when("center", console.log, console);

	// Expose a div element that will be added to the Chiasm container.
	// This is a special property that Chiasm looks for after components are constructed.
	my.el = document.createElement("div");

	// When you zoom out all the way, this line makes the background black
	// (by default it is gray).
	d3.select(my.el).style("background-color", "black");

	// Instantiate the Leaflet map, see docs at
	// http://leafletjs.com/reference.html#map-constructor
	my.map = L.map(my.el, {

	// Turn off the "Leaflet" link in the lower right corner.
	// Leaflet is properly attributed in the README.
	attributionControl: false

	}).setView(my.center, my.zoom);

	// Add the black & white style map layer.
	// Found by browsing http://leaflet-extras.github.io/leaflet-providers/preview/
	// TODO move this to configuration.
	L.tileLayer("http://stamen-tiles-{s}.a.ssl.fastly.net/toner/{z}/{x}/{y}.png").addTo(my.map);

	// Also try this http://{s}.tiles.earthatlas.info/natural-earth/{z}/{x}/{y}.png

	// Returns the current Leaflet map center
	// in a format that D3 understands: [longitude, latitude]
	function getCenter(){
	var center = my.map.getCenter();
	return [center.lng, center.lat];
	}

	// Sets the Leaflet map center to be the given center.
	// Note that Leaflet will immediately trigger a "move"
	// event
	function setCenter(center){
	my.map.off("move", onMove);
	my.map.panTo(L.latLng(center[1], center[0]), {
	animate: false
	});
	my.map.on("move", onMove);
	}

	my.map.on("move", onMove);

	function onMove(){
	my.center = getCenter();
	my.zoom = my.map.getZoom();
	}

	// If the center or zoom was set externally, update the map accordingly.
	my.when("center", setCenter);
	my.when("zoom", my.map.setZoom, my.map);

	my.when("box", function (box) {

	// Move to chiasm-layout?
	d3.select(my.el)
	.style("width", box.width + "px")
	.style("height", box.height + "px");

	// Tell Leaflet that the size has changed so it updates.
	my.map.invalidateSize();
	});

	return my;
	}
	// This is an example Chiasm plugin based on this D3 Canvas example:
	// http://bl.ocks.org/mbostock/ba63c55dd2dbc3ab0127
	function Globe (){

	var my = ChiasmComponent({
	backgroundColor: "black",
	foregroundColor: "white",
	center: [0, 0],
	zoom: 1,
	sens: 0.25
	});

	var canvas = document.createElement("canvas");
	var context = canvas.getContext("2d");

	var projection = d3.geo.orthographic()
	.clipAngle(90);

	var path = d3.geo.path()
	.projection(projection)
	.context(context);

	// Interaction that lets the user rotate the globe.
	// Draws from http://bl.ocks.org/KoGor/5994804
	d3.select(canvas)
	.call(d3.behavior.drag()
	.origin(function() {
	var r = projection.rotate();
	return {
	x: r[0] / my.sens,
	y: -r[1] / my.sens
	};
	})
	.on("drag", function() {
	var lng = -d3.event.x * my.sens;
	var lat = d3.event.y * my.sens;

	// Disallow rotation beyond the poles.
	lat = lat > 89 ? 89 : lat < -89 ? -89 : lat;

	my.center = [ lng, lat ];
	}));


	// Hand off the DOM element to the Chiasm layout plugin, which will inject it
	// into the parent container for us when we specify the special property `el`.
	my.el = canvas;

	// The following will all change at runtime, but they are set to some value to
	// handle the case that the render function gets run before they are updated.
	my.box = {
	width: 960,
	height: 600
	};
	my.radius = my.box.height / 2 - 5;
	my.scale = my.radius;
	my.cosLat = 1;

	my.when("box", function (box){
	canvas.width = box.width;
	canvas.height = box.height;
	projection.translate([box.width / 2, box.height / 2]);
	my.radius = box.height / 2 - 5;
	});

	my.when("radius", function (radius){
	my.scale = radius;
	});

	my.when("scale", function (scale){
	projection.scale(my.scale);
	});

	my.when("center", function (center){
	var lat = center[1];
	my.cosLat = Math.cos(toRadians(lat));

	my.rotate = [ -center[0], -center[1] ];
	});

	my.when("rotate", function (rotate){
	projection.rotate(rotate);
	});

	function toRadians(deg){
	return deg / 180 * Math.PI;
	}

	d3.json("world-110m.json", function(error, world) {
	if (error) throw error;

	var land = topojson.feature(world, world.objects.land);

	d3.timer(function(elapsed) {
	context.fillStyle = my.backgroundColor;
	context.fillRect(0, 0, my.box.width, my.box.height);

	context.fillStyle = my.foregroundColor;
	context.strokeStyle = my.foregroundColor;

	context.beginPath();
	path(land);
	context.fill();

	// This constant was tweaked such that the circle on the globe
	// roughly matches the viewport in the Leaflet map.
	var constant = 800;

	// Compute the size of the current viewport on the globe.
	// Draws from formula found at
	// http://wiki.openstreetmap.org/wiki/Zoom_levels
	var currentViewRadius = constant * my.box.height * my.cosLat / (Math.pow(2, my.zoom + 8));

	// Stop the code from crashing with transient states that happen on page load.
	currentViewRadius = currentViewRadius < 1 ? 1 : currentViewRadius;
	var radius = my.radius < 1 ? 1 : my.radius;

	context.beginPath();
	context.arc(my.box.width / 2, my.box.height / 2, radius, 0, 2 * Math.PI, true);
	context.lineWidth = 2.5;
	context.stroke();


	// This makes the circle invert whatever color is underneath it.
	context.save();
	context.globalCompositeOperation = "difference";
	context.strokeStyle = "white";

	// Draw the circle that represents the current zoom and pan.
	context.beginPath();
	context.arc(my.box.width / 2, my.box.height / 2, currentViewRadius, 0, 2 * Math.PI, true);
	context.lineWidth = 2.5;
	context.stroke();

	// This is the inverse of context.save(), it pops off the context stack so
	// we get back whatever the previous value was for
	// globalCompositeOperation.
	context.restore();
	});
	});

	return my;
	}
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8">
	<title>Map & Globe</title>

	<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/3.10.1/lodash.min.js"></script>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/topojson/1.6.19/topojson.min.js"></script>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.6/d3.min.js"></script>

	<!-- Leaflet.js, a geographic mapping library. -->
	<link rel="stylesheet" href="http://cdn.leafletjs.com/leaflet-0.7.5/leaflet.css" />
	<script src="http://cdn.leafletjs.com/leaflet-0.7.5/leaflet.js"></script>

	<!-- A functional reactive model library. github.com/curran/model -->
	<script src="http://curran.github.io/model/cdn/model-v0.2.4.js"></script>

	<!-- Chiasm core and plugins. github.com/chiasm-project -->
	<script src="http://chiasm-project.github.io/chiasm/chiasm-v0.2.0.js"></script>
	<script src="http://chiasm-project.github.io/chiasm-component/chiasm-component-v0.2.0.js"></script>
	<script src="http://chiasm-project.github.io/chiasm-layout/chiasm-layout-v0.2.1.js"></script>
	<script src="http://chiasm-project.github.io/chiasm-links/chiasm-links-v0.2.1.js"></script>

	<!-- Custom Chiasm plugins for this example. -->
	<script src="globe.js"></script>
	<script src="chiasm-leaflet.js"></script>

	<style>

	body {
	background-color: black;
	}

	/* Make the container fill the page using CSS. */
	#chiasm-container {
	position: fixed;
	left: 20px;
	right: 20px;
	top: 20px;
	bottom: 20px;
	}
	</style>

	</head>
	<body>
	<div id="chiasm-container"></div>

	<script>

	var chiasm = Chiasm();

	chiasm.plugins.layout = ChiasmLayout;
	chiasm.plugins.links = ChiasmLinks;
	chiasm.plugins.globe = Globe;
	chiasm.plugins.leaflet = ChiasmLeaflet;

	chiasm.setConfig({
	"layout": {
	"plugin": "layout",
	"state": {
	"containerSelector": "#chiasm-container",
	"layout": {
	"orientation": "horizontal",
	"children": [
	"leafletMap",
	"d3Globe",
	]
	}
	}
	},
	"leafletMap": {
	"plugin": "leaflet",
	"state": {
	"center": [-4.592, 39.859],
	"zoom": 5
	}
	},
	"d3Globe": {
	"plugin": "globe"
	},
	"links": {
	"plugin": "links",
	"state": {
	"bindings": [
	"leafletMap.zoom -> d3Globe.zoom",
	"leafletMap.center <-> d3Globe.center"
	]
	}
	}
	});

	</script>
	</body>
	</html>