Orthographic transition II

More DRY.

<!DOCTYPE html>
<meta charset="utf-8">
    <body>

var width = $(window).width() - 16,
            height = width,
            graticule = d3.geo.graticule(),
            norman = [-97.44, 35.22],
            tunisia = [9, 34],
            //35.2200° N, 97.4400° W norman
            //34.0000° N, 9.0000° E tunisia
            delay = 2000,
            duration = 10;

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("/d/4090846/world-110m.json", function(error, world) {

var countries = topojson.feature(world, world.objects.countries),
                land = topojson.feature(world, world.objects.land),
                grid = graticule(),
                sphere = {type:"Sphere"};

function rotate(array){

projection.rotate([-array[0], -array[1]]);

}

function draw(array){

rotate(array);

context.beginPath();
                path(countries);
                context.fillStyle = "#000";
                context.fill();
                context.strokeStyle = "#fff";
                context.stroke();

context.beginPath();
                path(sphere);
                context.lineWidth = 2;
                context.strokeStyle = "#000";
                context.stroke();

context.beginPath();
                path(grid);
                context.lineWidth = .5;
                context.strokeStyle = "#bbb";
                context.stroke();

};

( function transition() {

draw(tunisia);

d3.transition()
                    .delay(delay)
                    .duration(duration)
                    .tween("rotate", function() {

context.clearRect(0, 0, width, height);
                        draw(norman);

});
            }) ();

});

}) ();
    </script>

Modified http://d3js.org/d3.v3.min.js to a secure url

Modified http://d3js.org/topojson.v1.min.js to a secure url

https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js

https://d3js.org/d3.v3.min.js

https://d3js.org/topojson.v1.min.js