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World Countries
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<!DOCTYPE html>
<meta charset="utf-8">
<style>
.country {
fill: #b8b8b8;
stroke: #fff;
stroke-width: .5px;
stroke-linejoin: round;
}
.graticule {
fill: none;
stroke: #000;
stroke-opacity: .3;
stroke-width: .5px;
}
.graticule-outline {
fill: none;
stroke: #333;
stroke-width: 1.5px;
}
text {
font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
font-size: 18px;
font-weight: bold;
text-anchor: middle;
}
</style>
<body>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script src="http://d3js.org/topojson.v0.min.js"></script>
<script>
var width = 960,
height = 500;
var centroid = d3.geo.path()
.projection(function(d) { return d; })
.centroid;
var projection = d3.geo.orthographic()
.scale(248)
.clipAngle(90);
var path = d3.geo.path()
.projection(projection);
var graticule = d3.geo.graticule()
.extent([[-180, -90], [180 - .1, 90 - .1]]);
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
var line = svg.append("path")
.datum(graticule)
.attr("class", "graticule")
.attr("d", path);
svg.append("circle")
.attr("class", "graticule-outline")
.attr("cx", width / 2)
.attr("cy", height / 2)
.attr("r", projection.scale());
var title = svg.append("text")
.attr("x", width / 2)
.attr("y", height * 3 / 5);
var rotate = d3_geo_greatArcInterpolator();
d3.json("readme-world-110m.json", function(error, world) {
var countries = topojson.object(world, world.objects.countries).geometries,
i = -1,
n = countries.length;
var country = svg.selectAll(".country")
.data(countries)
.enter().insert("path", ".graticule")
.attr("class", "country")
.attr("d", path);
step();
function step() {
if (++i >= n) i = 0;
title.text(countries[i].id);
country.transition()
.style("fill", function(d, j) { return j === i ? "red" : "#b8b8b8"; });
d3.transition()
.delay(250)
.duration(1250)
.tween("rotate", function() {
var point = centroid(countries[i]);
rotate.source(projection.rotate()).target([-point[0], -point[1]]).distance();
return function(t) {
projection.rotate(rotate(t));
country.attr("d", path);
line.attr("d", path);
};
})
.transition()
.each("end", step);
}
});
var d3_radians = Math.PI / 180;
function d3_geo_greatArcInterpolator() {
var x0, y0, cy0, sy0, kx0, ky0,
x1, y1, cy1, sy1, kx1, ky1,
d,
k;
function interpolate(t) {
var B = Math.sin(t *= d) * k,
A = Math.sin(d - t) * k,
x = A * kx0 + B * kx1,
y = A * ky0 + B * ky1,
z = A * sy0 + B * sy1;
return [
Math.atan2(y, x) / d3_radians,
Math.atan2(z, Math.sqrt(x * x + y * y)) / d3_radians
];
}
interpolate.distance = function() {
if (d == null) k = 1 / Math.sin(d = Math.acos(Math.max(-1, Math.min(1, sy0 * sy1 + cy0 * cy1 * Math.cos(x1 - x0)))));
return d;
};
interpolate.source = function(_) {
var cx0 = Math.cos(x0 = _[0] * d3_radians),
sx0 = Math.sin(x0);
cy0 = Math.cos(y0 = _[1] * d3_radians);
sy0 = Math.sin(y0);
kx0 = cy0 * cx0;
ky0 = cy0 * sx0;
d = null;
return interpolate;
};
interpolate.target = function(_) {
var cx1 = Math.cos(x1 = _[0] * d3_radians),
sx1 = Math.sin(x1);
cy1 = Math.cos(y1 = _[1] * d3_radians);
sy1 = Math.sin(y1);
kx1 = cy1 * cx1;
ky1 = cy1 * sx1;
d = null;
return interpolate;
};
return interpolate;
}
</script>
@aggieben

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aggieben commented Aug 27, 2015

I've tried to boil this down a little simpler and do a single rotation to a given lat/long (that's a valid point in a geo projection, right?) and am not having much success. I replaced lines 87 - 112 with the following:

  d3.transition()
    .delay(250)
    .duration(1250)
    .tween("rotate", function() {
        var point = [33.66415023803711, -117.6449966430664];
        rotate.source(projection.rotate()).target([-point[0], -point[1]]).distance();
        return function(t) {
            projection.rotate(rotate(t));
        };
    });

Nothing at all happens, and I'm a little bit at a loss as to why. Would you mind correcting me on what I've missed?

@aggieben

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aggieben commented Aug 27, 2015

Heh....nevermind. I wasn't setting the 'd' attribute on country or line. Still figuring out how to use lat/long though.

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