zross/index.html

## index.html
<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8" />
    <link rel="stylesheet" href="http://cdn.leafletjs.com/leaflet-0.7/leaflet.css" />
    <script src="http://d3js.org/d3.v3.min.js" type="text/javascript"></script>
    <script src="http://cdn.leafletjs.com/leaflet-0.7/leaflet.js"></script>
    <script src='https://api.tiles.mapbox.com/mapbox.js/v1.6.4/mapbox.js'></script>
    <link href='https://api.tiles.mapbox.com/mapbox.js/v1.6.4/mapbox.css' rel='stylesheet' />
    <style>
    html,
    body {
        height: 100%;
        width: 100%;
    }
    body {
        margin: 0;
    }
    #map {
        width: 100%;
        height: 100%;
    }
    svg {
        position: relative;
    }
    path {
        fill: yellow;
        stroke-width: 2px;
        stroke: red;
        stroke-opacity: 1;
    }
    .travelMarker {
        fill: yellow;
        opacity: 0.75;
    }
    .waypoints {
        fill: black;
        opacity: 0;
    }
}
.drinks {
    stroke: black;
    fill: red;
}
.lineConnect {
    fill: none;
    stroke: black;
    opacity: 1;
}
.locnames {
    fill: black;
    text-shadow: 1px 1px 1px #FFF, 3px 3px 5px #000;
    font-weight: bold;
    font-size: 13px;
}
    </style>

</head>

<body>

    <div id="demo"></div>
    <div id="map"></div>
    <script type="text/javascript">
    var mapboxTiles = L.tileLayer('https://{s}.tiles.mapbox.com/v3/examples.map-zr0njcqy/{z}/{x}/{y}.png', {
        attribution: '<a href="http://www.mapbox.com/about/maps/" target="_blank">Terms &amp; Feedback</a>'
    });


    var map = L.map('map')
        .addLayer(mapboxTiles)
        .setView([40.72332345541449, -73.99], 14);


    // we will be appending the SVG to the Leaflet map pane
    // g (group) element will be inside the svg
    var svg = d3.select(map.getPanes().overlayPane).append("svg");

    // if you don't include the leaflet-zoom-hide when a
    // user zooms in or out you will still see the phantom
    // original SVG
    var g = svg.append("g").attr("class", "leaflet-zoom-hide");


    //read in the GeoJSON. This function is asynchronous so
    // anything that needs the json file should be within
    d3.json("points.geojson", function(collection) {

        // this is not needed right now, but for future we may need
        // to implement some filtering. This uses the d3 filter function
        // featuresdata is an array of point objects

        var featuresdata = collection.features.filter(function(d) {
            return d.properties.id == "route1"
        })

        //stream transform. transforms geometry before passing it to
        // listener. Can be used in conjunction with d3.geo.path
        // to implement the transform.

        var transform = d3.geo.transform({
            point: projectPoint
        });

        //d3.geo.path translates GeoJSON to SVG path codes.
        //essentially a path generator. In this case it's
        // a path generator referencing our custom "projection"
        // which is the Leaflet method latLngToLayerPoint inside
        // our function called projectPoint
        var d3path = d3.geo.path().projection(transform);


        // Here we're creating a FUNCTION to generate a line
        // from input points. Since input points will be in
        // Lat/Long they need to be converted to map units
        // with applyLatLngToLayer
        var toLine = d3.svg.line()
            .interpolate("linear")
            .x(function(d) {
                return applyLatLngToLayer(d).x
            })
            .y(function(d) {
                return applyLatLngToLayer(d).y
            });


        // From now on we are essentially appending our features to the
        // group element. We're adding a class with the line name
        // and we're making them invisible

        // these are the points that make up the path
        // they are unnecessary so I've make them
        // transparent for now
        var ptFeatures = g.selectAll("circle")
            .data(featuresdata)
            .enter()
            .append("circle")
            .attr("r", 3)
            .attr("class", "waypoints");

        // Here we will make the points into a single
        // line/path. Note that we surround the featuresdata
        // with [] to tell d3 to treat all the points as a
        // single line. For now these are basically points
        // but below we set the "d" attribute using the
        // line creator function from above.
        var linePath = g.selectAll(".lineConnect")
            .data([featuresdata])
            .enter()
            .append("path")
            .attr("class", "lineConnect");

        // This will be our traveling circle it will
        // travel along our path
        var marker = g.append("circle")
            .attr("r", 10)
            .attr("id", "marker")
            .attr("class", "travelMarker");


        // For simplicity I hard-coded this! I'm taking
        // the first and the last object (the origin)
        // and destination and adding them separately to
        // better style them. There is probably a better
        // way to do this!
        var originANDdestination = [featuresdata[0], featuresdata[17]]

        var begend = g.selectAll(".drinks")
            .data(originANDdestination)
            .enter()
            .append("circle", ".drinks")
            .attr("r", 5)
            .style("fill", "red")
            .style("opacity", "1");

        // I want names for my coffee and beer
        var text = g.selectAll("text")
            .data(originANDdestination)
            .enter()
            .append("text")
            .text(function(d) {
                return d.properties.name
            })
            .attr("class", "locnames")
            .attr("y", function(d) {
                return -10
            })


        // when the user zooms in or out you need to reset
        // the view
        map.on("viewreset", reset);

        // this puts stuff on the map!
        reset();
        transition();

        // Reposition the SVG to cover the features.
        function reset() {
            var bounds = d3path.bounds(collection),
                topLeft = bounds[0],
                bottomRight = bounds[1];


            // here you're setting some styles, width, heigh etc
            // to the SVG. Note that we're adding a little height and
            // width because otherwise the bounding box would perfectly
            // cover our features BUT... since you might be using a big
            // circle to represent a 1 dimensional point, the circle
            // might get cut off.

            text.attr("transform",
                function(d) {
                    return "translate(" +
                        applyLatLngToLayer(d).x + "," +
                        applyLatLngToLayer(d).y + ")";
                });


            // for the points we need to convert from latlong
            // to map units
            begend.attr("transform",
                function(d) {
                    return "translate(" +
                        applyLatLngToLayer(d).x + "," +
                        applyLatLngToLayer(d).y + ")";
                });

            ptFeatures.attr("transform",
                function(d) {
                    return "translate(" +
                        applyLatLngToLayer(d).x + "," +
                        applyLatLngToLayer(d).y + ")";
                });

            // again, not best practice, but I'm harding coding
            // the starting point

            marker.attr("transform",
                function() {
                    var y = featuresdata[0].geometry.coordinates[1]
                    var x = featuresdata[0].geometry.coordinates[0]
                    return "translate(" +
                        map.latLngToLayerPoint(new L.LatLng(y, x)).x + "," +
                        map.latLngToLayerPoint(new L.LatLng(y, x)).y + ")";
                });


            // Setting the size and location of the overall SVG container
            svg.attr("width", bottomRight[0] - topLeft[0] + 120)
                .attr("height", bottomRight[1] - topLeft[1] + 120)
                .style("left", topLeft[0] - 50 + "px")
                .style("top", topLeft[1] - 50 + "px");


            // linePath.attr("d", d3path);
            linePath.attr("d", toLine)
            // ptPath.attr("d", d3path);
            g.attr("transform", "translate(" + (-topLeft[0] + 50) + "," + (-topLeft[1] + 50) + ")");

        } // end reset

        // the transition function could have been done above using
        // chaining but it's cleaner to have a separate function.
        // the transition. Dash array expects "500, 30" where
        // 500 is the length of the "dash" 30 is the length of the
        // gap. So if you had a line that is 500 long and you used
        // "500, 0" you would have a solid line. If you had "500,500"
        // you would have a 500px line followed by a 500px gap. This
        // can be manipulated by starting with a complete gap "0,500"
        // then a small line "1,500" then bigger line "2,500" and so
        // on. The values themselves ("0,500", "1,500" etc) are being
        // fed to the attrTween operator
        function transition() {
            linePath.transition()
                .duration(7500)
                .attrTween("stroke-dasharray", tweenDash)
                .each("end", function() {
                    d3.select(this).call(transition);// infinite loop
                });
        } //end transition

        // this function feeds the attrTween operator above with the
        // stroke and dash lengths
        function tweenDash() {
            //total length of path (single value)
            var l = linePath.node().getTotalLength();

            // this is creating a function called interpolate which takes
            // as input a single value 0-1. The function will interpolate
            // between the numbers embedded in a string. An example might
            // be interpolatString("0,500", "500,500") in which case
            // the first number would interpolate through 0-500 and the
            // second number through 500-500 (always 500). So, then
            // if you used interpolate(0.5) you would get "250, 500"
            // when input into the attrTween above this means give me
            // a line of length 250 followed by a gap of 500. Since the
            // total line length, though is only 500 to begin with this
            // essentially says give me a line of 250px followed by a gap
            // of 250px.
            interpolate = d3.interpolateString("0," + l, l + "," + l);
            return function(t) {
                //t is fraction of time 0-1 since transition began
                var marker = d3.select("#marker");

                // p is the point on the line (coordinates) at a given length
                // along the line. In this case if l=50 and we're midway through
                // the time then this would 25.
                var p = linePath.node().getPointAtLength(t * l);

                //Move the marker to that point
                marker.attr("transform", "translate(" + p.x + "," + p.y + ")"); //move marker
                console.log(interpolate(t))
                return interpolate(t);
            }
        } //end tweenDash

        // Use Leaflet to implement a D3 geometric transformation.
        // the latLngToLayerPoint is a Leaflet conversion method:
        //Returns the map layer point that corresponds to the given geographical
        // coordinates (useful for placing overlays on the map).
        function projectPoint(x, y) {
            var point = map.latLngToLayerPoint(new L.LatLng(y, x));
            this.stream.point(point.x, point.y);
        } //end projectPoint
    });


    // similar to projectPoint this function converts lat/long to
    // svg coordinates except that it accepts a point from our
    // GeoJSON

    function applyLatLngToLayer(d) {
        var y = d.geometry.coordinates[1]
        var x = d.geometry.coordinates[0]
        return map.latLngToLayerPoint(new L.LatLng(y, x))


    }
    </script>
</body>

</html>

## points.geojson
{
"type": "FeatureCollection",
"crs": { "type": "name", "properties": { "name": "urn:ogc:def:crs:OGC:1.3:CRS84" } },

"features": [
{ "type": "Feature", "properties": { "latitude": 40.722390, "longitude": -73.995170, "time": 1, "id": "route1", "name":"Gimme" }, "geometry": { "type": "Point", "coordinates": [ -73.99517, 40.72239 ] } },
{ "type": "Feature", "properties": { "latitude": 40.721580, "longitude": -73.995480, "time": 2, "id": "route1", "name":"Along route"  }, "geometry": { "type": "Point", "coordinates": [ -73.99548, 40.72158 ] } },
{ "type": "Feature", "properties": { "latitude": 40.721280, "longitude": -73.994720, "time": 3, "id": "route1", "name":"Along route"   }, "geometry": { "type": "Point", "coordinates": [ -73.99472, 40.72128 ] } },
{ "type": "Feature", "properties": { "latitude": 40.720890, "longitude": -73.993760, "time": 4, "id": "route1" , "name":"Along route"  }, "geometry": { "type": "Point", "coordinates": [ -73.99376, 40.72089 ] } },
{ "type": "Feature", "properties": { "latitude": 40.721580, "longitude": -73.993480, "time": 5, "id": "route1", "name":"Along route"   }, "geometry": { "type": "Point", "coordinates": [ -73.99348, 40.72158 ] } },
{ "type": "Feature", "properties": { "latitude": 40.722310, "longitude": -73.993220, "time": 6, "id": "route1", "name":"Along route"   }, "geometry": { "type": "Point", "coordinates": [ -73.99322, 40.72231 ] } },
{ "type": "Feature", "properties": { "latitude": 40.722470, "longitude": -73.993160, "time": 7, "id": "route1", "name":"Along route"   }, "geometry": { "type": "Point", "coordinates": [ -73.99316, 40.72247 ] } },
{ "type": "Feature", "properties": { "latitude": 40.723580, "longitude": -73.992740, "time": 8, "id": "route1", "name":"Along route"   }, "geometry": { "type": "Point", "coordinates": [ -73.99274, 40.72358 ] } },
{ "type": "Feature", "properties": { "latitude": 40.725190, "longitude": -73.992150, "time": 9, "id": "route1", "name":"Along route"   }, "geometry": { "type": "Point", "coordinates": [ -73.99215, 40.72519 ] } },
{ "type": "Feature", "properties": { "latitude": 40.725590, "longitude": -73.992020, "time": 10, "id": "route1", "name":"Along route"   }, "geometry": { "type": "Point", "coordinates": [ -73.99202, 40.72559 ] } },
{ "type": "Feature", "properties": { "latitude": 40.725390, "longitude": -73.991510, "time": 11, "id": "route1", "name":"Along route"   }, "geometry": { "type": "Point", "coordinates": [ -73.99151, 40.72539 ] } },
{ "type": "Feature", "properties": { "latitude": 40.724180, "longitude": -73.988650, "time": 12, "id": "route1", "name":"Along route"   }, "geometry": { "type": "Point", "coordinates": [ -73.98865, 40.72418 ] } },
{ "type": "Feature", "properties": { "latitude": 40.723900, "longitude": -73.987980, "time": 13, "id": "route1", "name":"Along route"   }, "geometry": { "type": "Point", "coordinates": [ -73.98798, 40.7239 ] } },
{ "type": "Feature", "properties": { "latitude": 40.724550, "longitude": -73.987510, "time": 14, "id": "route1", "name":"Along route"   }, "geometry": { "type": "Point", "coordinates": [ -73.98751, 40.72455 ] } },
{ "type": "Feature", "properties": { "latitude": 40.726370, "longitude": -73.986180, "time": 15, "id": "route1", "name":"Along route"   }, "geometry": { "type": "Point", "coordinates": [ -73.98618, 40.72637 ] } },
{ "type": "Feature", "properties": { "latitude": 40.726960, "longitude": -73.985750, "time": 16, "id": "route1", "name":"Along route"   }, "geometry": { "type": "Point", "coordinates": [ -73.98575, 40.72696 ] } },
{ "type": "Feature", "properties": { "latitude": 40.727570, "longitude": -73.985310, "time": 17, "id": "route1", "name":"Along route"   }, "geometry": { "type": "Point", "coordinates": [ -73.98531, 40.72757 ] } },
{ "type": "Feature", "properties": { "latitude": 40.727250, "longitude": -73.984550, "time": 18, "id": "route1", "name":"Proletariat"   }, "geometry": { "type": "Point", "coordinates": [ -73.98455, 40.72725 ] } }
]
}
	<!DOCTYPE html>
	<html>

	<head>
	<meta charset="utf-8" />
	<link rel="stylesheet" href="http://cdn.leafletjs.com/leaflet-0.7/leaflet.css" />
	<script src="http://d3js.org/d3.v3.min.js" type="text/javascript"></script>
	<script src="http://cdn.leafletjs.com/leaflet-0.7/leaflet.js"></script>
	<script src='https://api.tiles.mapbox.com/mapbox.js/v1.6.4/mapbox.js'></script>
	<link href='https://api.tiles.mapbox.com/mapbox.js/v1.6.4/mapbox.css' rel='stylesheet' />
	<style>
	html,
	body {
	height: 100%;
	width: 100%;
	}
	body {
	margin: 0;
	}
	#map {
	width: 100%;
	height: 100%;
	}
	svg {
	position: relative;
	}
	path {
	fill: yellow;
	stroke-width: 2px;
	stroke: red;
	stroke-opacity: 1;
	}
	.travelMarker {
	fill: yellow;
	opacity: 0.75;
	}
	.waypoints {
	fill: black;
	opacity: 0;
	}
	}
	.drinks {
	stroke: black;
	fill: red;
	}
	.lineConnect {
	fill: none;
	stroke: black;
	opacity: 1;
	}
	.locnames {
	fill: black;
	text-shadow: 1px 1px 1px #FFF, 3px 3px 5px #000;
	font-weight: bold;
	font-size: 13px;
	}
	</style>

	</head>

	<body>

	<div id="demo"></div>
	<div id="map"></div>
	<script type="text/javascript">
	var mapboxTiles = L.tileLayer('https://{s}.tiles.mapbox.com/v3/examples.map-zr0njcqy/{z}/{x}/{y}.png', {
	attribution: '<a href="http://www.mapbox.com/about/maps/" target="_blank">Terms & Feedback</a>'
	});


	var map = L.map('map')
	.addLayer(mapboxTiles)
	.setView([40.72332345541449, -73.99], 14);


	// we will be appending the SVG to the Leaflet map pane
	// g (group) element will be inside the svg
	var svg = d3.select(map.getPanes().overlayPane).append("svg");

	// if you don't include the leaflet-zoom-hide when a
	// user zooms in or out you will still see the phantom
	// original SVG
	var g = svg.append("g").attr("class", "leaflet-zoom-hide");


	//read in the GeoJSON. This function is asynchronous so
	// anything that needs the json file should be within
	d3.json("points.geojson", function(collection) {

	// this is not needed right now, but for future we may need
	// to implement some filtering. This uses the d3 filter function
	// featuresdata is an array of point objects

	var featuresdata = collection.features.filter(function(d) {
	return d.properties.id == "route1"
	})

	//stream transform. transforms geometry before passing it to
	// listener. Can be used in conjunction with d3.geo.path
	// to implement the transform.

	var transform = d3.geo.transform({
	point: projectPoint
	});

	//d3.geo.path translates GeoJSON to SVG path codes.
	//essentially a path generator. In this case it's
	// a path generator referencing our custom "projection"
	// which is the Leaflet method latLngToLayerPoint inside
	// our function called projectPoint
	var d3path = d3.geo.path().projection(transform);


	// Here we're creating a FUNCTION to generate a line
	// from input points. Since input points will be in
	// Lat/Long they need to be converted to map units
	// with applyLatLngToLayer
	var toLine = d3.svg.line()
	.interpolate("linear")
	.x(function(d) {
	return applyLatLngToLayer(d).x
	})
	.y(function(d) {
	return applyLatLngToLayer(d).y
	});


	// From now on we are essentially appending our features to the
	// group element. We're adding a class with the line name
	// and we're making them invisible

	// these are the points that make up the path
	// they are unnecessary so I've make them
	// transparent for now
	var ptFeatures = g.selectAll("circle")
	.data(featuresdata)
	.enter()
	.append("circle")
	.attr("r", 3)
	.attr("class", "waypoints");

	// Here we will make the points into a single
	// line/path. Note that we surround the featuresdata
	// with [] to tell d3 to treat all the points as a
	// single line. For now these are basically points
	// but below we set the "d" attribute using the
	// line creator function from above.
	var linePath = g.selectAll(".lineConnect")
	.data([featuresdata])
	.enter()
	.append("path")
	.attr("class", "lineConnect");

	// This will be our traveling circle it will
	// travel along our path
	var marker = g.append("circle")
	.attr("r", 10)
	.attr("id", "marker")
	.attr("class", "travelMarker");


	// For simplicity I hard-coded this! I'm taking
	// the first and the last object (the origin)
	// and destination and adding them separately to
	// better style them. There is probably a better
	// way to do this!
	var originANDdestination = [featuresdata[0], featuresdata[17]]

	var begend = g.selectAll(".drinks")
	.data(originANDdestination)
	.enter()
	.append("circle", ".drinks")
	.attr("r", 5)
	.style("fill", "red")
	.style("opacity", "1");

	// I want names for my coffee and beer
	var text = g.selectAll("text")
	.data(originANDdestination)
	.enter()
	.append("text")
	.text(function(d) {
	return d.properties.name
	})
	.attr("class", "locnames")
	.attr("y", function(d) {
	return -10
	})


	// when the user zooms in or out you need to reset
	// the view
	map.on("viewreset", reset);

	// this puts stuff on the map!
	reset();
	transition();

	// Reposition the SVG to cover the features.
	function reset() {
	var bounds = d3path.bounds(collection),
	topLeft = bounds[0],
	bottomRight = bounds[1];


	// here you're setting some styles, width, heigh etc
	// to the SVG. Note that we're adding a little height and
	// width because otherwise the bounding box would perfectly
	// cover our features BUT... since you might be using a big
	// circle to represent a 1 dimensional point, the circle
	// might get cut off.

	text.attr("transform",
	function(d) {
	return "translate(" +
	applyLatLngToLayer(d).x + "," +
	applyLatLngToLayer(d).y + ")";
	});


	// for the points we need to convert from latlong
	// to map units
	begend.attr("transform",
	function(d) {
	return "translate(" +
	applyLatLngToLayer(d).x + "," +
	applyLatLngToLayer(d).y + ")";
	});

	ptFeatures.attr("transform",
	function(d) {
	return "translate(" +
	applyLatLngToLayer(d).x + "," +
	applyLatLngToLayer(d).y + ")";
	});

	// again, not best practice, but I'm harding coding
	// the starting point

	marker.attr("transform",
	function() {
	var y = featuresdata[0].geometry.coordinates[1]
	var x = featuresdata[0].geometry.coordinates[0]
	return "translate(" +
	map.latLngToLayerPoint(new L.LatLng(y, x)).x + "," +
	map.latLngToLayerPoint(new L.LatLng(y, x)).y + ")";
	});


	// Setting the size and location of the overall SVG container
	svg.attr("width", bottomRight[0] - topLeft[0] + 120)
	.attr("height", bottomRight[1] - topLeft[1] + 120)
	.style("left", topLeft[0] - 50 + "px")
	.style("top", topLeft[1] - 50 + "px");


	// linePath.attr("d", d3path);
	linePath.attr("d", toLine)
	// ptPath.attr("d", d3path);
	g.attr("transform", "translate(" + (-topLeft[0] + 50) + "," + (-topLeft[1] + 50) + ")");

	} // end reset

	// the transition function could have been done above using
	// chaining but it's cleaner to have a separate function.
	// the transition. Dash array expects "500, 30" where
	// 500 is the length of the "dash" 30 is the length of the
	// gap. So if you had a line that is 500 long and you used
	// "500, 0" you would have a solid line. If you had "500,500"
	// you would have a 500px line followed by a 500px gap. This
	// can be manipulated by starting with a complete gap "0,500"
	// then a small line "1,500" then bigger line "2,500" and so
	// on. The values themselves ("0,500", "1,500" etc) are being
	// fed to the attrTween operator
	function transition() {
	linePath.transition()
	.duration(7500)
	.attrTween("stroke-dasharray", tweenDash)
	.each("end", function() {
	d3.select(this).call(transition);// infinite loop
	});
	} //end transition

	// this function feeds the attrTween operator above with the
	// stroke and dash lengths
	function tweenDash() {
	//total length of path (single value)
	var l = linePath.node().getTotalLength();

	// this is creating a function called interpolate which takes
	// as input a single value 0-1. The function will interpolate
	// between the numbers embedded in a string. An example might
	// be interpolatString("0,500", "500,500") in which case
	// the first number would interpolate through 0-500 and the
	// second number through 500-500 (always 500). So, then
	// if you used interpolate(0.5) you would get "250, 500"
	// when input into the attrTween above this means give me
	// a line of length 250 followed by a gap of 500. Since the
	// total line length, though is only 500 to begin with this
	// essentially says give me a line of 250px followed by a gap
	// of 250px.
	interpolate = d3.interpolateString("0," + l, l + "," + l);
	return function(t) {
	//t is fraction of time 0-1 since transition began
	var marker = d3.select("#marker");

	// p is the point on the line (coordinates) at a given length
	// along the line. In this case if l=50 and we're midway through
	// the time then this would 25.
	var p = linePath.node().getPointAtLength(t * l);

	//Move the marker to that point
	marker.attr("transform", "translate(" + p.x + "," + p.y + ")"); //move marker
	console.log(interpolate(t))
	return interpolate(t);
	}
	} //end tweenDash

	// Use Leaflet to implement a D3 geometric transformation.
	// the latLngToLayerPoint is a Leaflet conversion method:
	//Returns the map layer point that corresponds to the given geographical
	// coordinates (useful for placing overlays on the map).
	function projectPoint(x, y) {
	var point = map.latLngToLayerPoint(new L.LatLng(y, x));
	this.stream.point(point.x, point.y);
	} //end projectPoint
	});


	// similar to projectPoint this function converts lat/long to
	// svg coordinates except that it accepts a point from our
	// GeoJSON

	function applyLatLngToLayer(d) {
	var y = d.geometry.coordinates[1]
	var x = d.geometry.coordinates[0]
	return map.latLngToLayerPoint(new L.LatLng(y, x))


	}
	</script>
	</body>

	</html>
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