var width = 300,
height = 300;
var centroid = d3.geo.path()
.projection(function(d) { return d; })
.centroid;
var projection = d3.geo.orthographic()
.scale(height / 2.0)
.translate([width / 2, height / 2])
.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(".globe").append("svg")
.attr("width", width)
.attr("height", height)
.attr("class", "world-center");
svg.append("circle")
.attr("class", "world-outline")
.attr("cx", width / 2)
.attr("cy", height / 2)
.attr("r", projection.scale());
var rotate = d3_geo_greatArcInterpolator();
// Define your specific set of country IDs
var specificCountryIds = [392, 840];
d3.json("https://s3-us-west-2.amazonaws.com/s.cdpn.io/95802/world-110m.json", function(error, world) {
var countries = topojson.object(world, world.objects.countries).geometries,
i = -1,
n = countries.length;
projection.clipAngle(180);
var backLine = svg.append("path")
.datum(graticule)
.attr("class", "back-line")
.attr("d", path);
var backCountry = svg.selectAll(".back-country")
.data(countries)
.enter().insert("path", ".back-line")
.attr("class", "back-country")
.attr("d", path);
projection.clipAngle(90);
var line = svg.append("path")
.datum(graticule)
.attr("class", "line")
.attr("d", path);
var country = svg.selectAll(".country")
.data(countries)
.enter().insert("path", ".line")
.attr("class", "country")
.attr("d", path);
var title = svg.append("text")
.attr("x", width / 2)
.attr("y", height * 3 / 5);
var arcPath = svg.append("path")
.attr("class", "arc-path")
.style("fill", "none")
.style("stroke", "#d7000e")
.style("stroke-width", "2px");
var currentCountryIndex = 0;
var lastSelectedIndex = -1; // Initialize with an invalid index
step();
function step() {
var selectedCountryId = specificCountryIds[currentCountryIndex]; // Get the current country ID from the list
var selectedCountry = countries.find(d => d.id === selectedCountryId); // Find the country in the dataset
// Increment the index, wrapping around if necessary
currentCountryIndex = (currentCountryIndex + 1) % specificCountryIds.length;
// Check if the selected country exists in the dataset
if (!selectedCountry) {
console.error("Selected country not found in the dataset");
return;
}
var currentIndex = countries.indexOf(selectedCountry);
var previousIndex = lastSelectedIndex; // Use the last selected index as the previous index
if (previousIndex === -1 || !countries[previousIndex]) {
previousIndex = currentIndex; // Default to current if no valid previous
}
lastSelectedIndex = currentIndex; // Update last selected index to current
var p0 = centroid(countries[previousIndex]);
var p1 = centroid(selectedCountry);
console.log("Previous:", countries[previousIndex] ? countries[previousIndex].id : "none", "Current:", selectedCountry.id);
country.transition()
.style("fill", function(d) {
return d.id === selectedCountry.id ? "#d7000e" : (d.id === countries[previousIndex].id ? "#d7000e" : "#737368");
});
rotate.source(projection.rotate()).target([-p1[0], -p1[1]]).distance();
d3.transition()
.delay(250)
.duration(6000)
.tween("rotate", function() {
var r = d3.interpolate(projection.rotate(), [-p1[0], -p1[1]]);
return function(t) {
var rt = r(t);
projection.rotate(rt).clipAngle(180);
backCountry.attr("d", path);
projection.rotate(rt).clipAngle(90);
country.attr("d", path);
var ip = d3.geo.interpolate(p0, p1)(t); // Interpolating from previous to current
arcPath.attr("d", path({type: "LineString", coordinates: [p0, ip]}));
};
})
.transition()
.each("end", step);
}
currentCountryIndex = (currentCountryIndex + 1) % specificCountryIds.length;
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;
}
