D3 Examples - Orthographic Transition III

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<!DOCTYPE html>
<meta charset="utf-8">
    <body>
​
    <script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
    <script src="https://d3js.org/d3.v3.min.js"></script>
    <script src="https://d3js.org/topojson.v1.min.js"></script>
    <script>
    ( function map() {
​
        var width = $(window).width() - 16,
            height = width,
            graticule = d3.geo.graticule(),
            norman = [-97.44, 35.22], //35.2200° N, 97.4400° W norman
            tunisia = [9, 34], //34.0000° N, 9.0000° E tunisia
            delay = 1000,
            duration = 3000;
​
        var projection = d3.geo.orthographic()
            .scale(width / 2)
            .clipAngle(90)
            .translate([width / 2, height / 2]);
​
        var canvas = d3.select("body").append("canvas")
            .attr("width", width)
            .attr("height", height);
​
        var context = canvas.node().getContext("2d");
​
        var path = d3.geo.path()
            .projection(projection)
            .context(context);
​
        d3.json("world.json", function(error, world) {
​
            var countries = topojson.feature(world, world.objects.countries),
                land = topojson.feature(world, world.objects.land),
                grid = graticule(),
                globe = {type:"Sphere"};
​
            function projrotate(array){
​
                projection.rotate([-array[0], -array[1]]);
​
            }
​
            function draw() {
​
                context.beginPath();
                path(countries);
                context.fillStyle = "#000";
                context.fill();
                context.strokeStyle = "#fff";
                context.stroke();
​
                context.beginPath();
                path(globe);
                context.lineWidth = 2;
                context.strokeStyle = "#000";
                context.stroke();
​
                context.beginPath();
                path(grid);
                context.lineWidth = .5;
                context.strokeStyle = "#bbb";
                context.stroke();
​
            };
​
            projrotate(tunisia)
            draw();
​
            ( function transition() {
​
                d3.transition()
                    .delay(delay)
                    .duration(duration)
                    .tween("rotate", function() {
​
                        var r = d3.interpolate(projection.rotate(), [-norman[0], -norman[1]]);
​
                        return function(t) {
​
                            projection.rotate(r(t));
                            context.clearRect(0, 0, width, height);
                            draw();
​
                        }
​
                    })
                    .transition()
​
            }) ();
​
​
        });
​
​
​
    }) ();
    </script>
​
    