在另一位用戶的建議下，我決定用v4重做我的地圖。因此，考慮到這一點，我已經開始使用一張簡單的地圖，並一直在the arcs docs上閱讀，但我如何將其應用於地圖？如何添加弧線d3 v4地圖
var arc = d3.arc();
arc({
innerRadius: 0,
outerRadius: 100,
startAngle: 0,
endAngle: Math.PI/2
}); // "M0,-100A100,100,0,0,1,100,0L0,0Z"
plnkr：http://plnkr.co/edit/ttXZdjmZDaqtTNvhb6Qz?p=preview
我離開你掛在您的評論的問題在你前面的問題所以這裏是你所追求的快速刺。最初的地圖繪製來自d3文檔示例here。繪製完成後，我添加一條線，其中包含從here借用的自定義弧線。然後，我使用attrTween和"stroke-dasharray"來爲生成的線條生成動畫，並在該轉換結束時使用另一個轉換來增加該圓圈。
運行代碼：
<!DOCTYPE html>
<meta charset="utf-8">
<style>
.stroke {
fill: none;
stroke: #000;
stroke-width: 3px;
}
.fill {
fill: #fff;
}
.graticule {
fill: none;
stroke: #777;
stroke-width: 0.5px;
stroke-opacity: 0.5;
}
.land {
fill: #222;
}
.boundary {
fill: none;
stroke: #fff;
stroke-width: 0.5px;
}
</style>
<svg width="960" height="960"></svg>
<script src="//d3js.org/d3.v4.js"></script>
<script src="//d3js.org/topojson.v1.min.js"></script>
<script>
var svg = d3.select("svg"),
width = +svg.attr("width"),
height = +svg.attr("height");
var projection = d3.geoMercator()
.scale((width - 3)/(2 * Math.PI))
.translate([width/2, height/2]);
var path = d3.geoPath()
.projection(projection);
var graticule = d3.geoGraticule();
svg.append("defs").append("path")
.datum({
type: "Sphere"
})
.attr("id", "sphere")
.attr("d", path);
svg.append("use")
.attr("class", "stroke")
.attr("xlink:href", "#sphere");
svg.append("use")
.attr("class", "fill")
.attr("xlink:href", "#sphere");
svg.append("path")
.datum(graticule)
.attr("class", "graticule")
.attr("d", path);
d3.json("https://rawgit.com/d3/d3-geo/master/test/data/world-50m.json", function(error, world) {
if (error) throw error;
svg.insert("path", ".graticule")
.datum(topojson.feature(world, world.objects.land))
.attr("class", "land")
.attr("d", path);
svg.insert("path", ".graticule")
.datum(topojson.mesh(world, world.objects.countries, function(a, b) {
return a !== b;
}))
.attr("class", "boundary")
.attr("d", path);
var coordinates = [
projection([-74, 40]), // new york
projection([-43, -22]) // rio 22.9068° S, 43.1729° W
];
var line = svg.append("path")
.datum(coordinates)
.attr("d", function(c) {
var d = {
source: c[0],
target: c[1]
};
var dx = d.target[0] - d.source[0],
dy = d.target[1] - d.source[1],
dr = Math.sqrt(dx * dx + dy * dy);
return "M" + d.source[0] + "," + d.source[1] + "A" + dr + "," + dr +
" 0 0,1 " + d.target[0] + "," + d.target[1];
})
.style("stroke", "steelblue")
.style("stroke-width", 5)
.style("fill", "none")
.transition()
.duration(5000)
.attrTween("stroke-dasharray", function() {
var len = this.getTotalLength();
return function(t) {
return (d3.interpolateString("0," + len, len + ",0"))(t)
};
})
.on('end', function(d) {
var c = coordinates[1];
svg.append('circle')
.attr('cx', c[0])
.attr('cy', c[1])
.attr('r', 0)
.style('fill', 'red')
.style('fill-opacity', '0.5')
.transition()
.duration(2000)
.attr('r', 50)
.on('end', function(d) {
d3.select(this)
.transition()
.duration(2000)
.attr('r', 10);
});
});
});
</script><!DOCTYPE html>
<meta charset="utf-8">
<style>
.stroke {
fill: none;
stroke: #000;
stroke-width: 3px;
}
.fill {
fill: #fff;
}
.graticule {
fill: none;
stroke: #777;
stroke-width: 0.5px;
stroke-opacity: 0.5;
}
.land {
fill: #222;
}
.boundary {
fill: none;
stroke: #fff;
stroke-width: 0.5px;
}
</style>
<svg width="960" height="960"></svg>
<script src="//d3js.org/d3.v4.js"></script>
<script src="//d3js.org/topojson.v1.min.js"></script>
<script>
var svg = d3.select("svg"),
width = +svg.attr("width"),
height = +svg.attr("height");
var projection = d3.geoMercator()
.scale((width - 3)/(2 * Math.PI))
.translate([width/2, height/2]);
var path = d3.geoPath()
.projection(projection);
var graticule = d3.geoGraticule();
svg.append("defs").append("path")
.datum({
type: "Sphere"
})
.attr("id", "sphere")
.attr("d", path);
svg.append("use")
.attr("class", "stroke")
.attr("xlink:href", "#sphere");
svg.append("use")
.attr("class", "fill")
.attr("xlink:href", "#sphere");
svg.append("path")
.datum(graticule)
.attr("class", "graticule")
.attr("d", path);
d3.json("https://rawgit.com/mbostock/topojson/master/examples/world-50m.json", function(error, world) {
if (error) throw error;
svg.insert("path", ".graticule")
.datum(topojson.feature(world, world.objects.land))
.attr("class", "land")
.attr("d", path);
svg.insert("path", ".graticule")
.datum(topojson.mesh(world, world.objects.countries, function(a, b) {
return a !== b;
}))
.attr("class", "boundary")
.attr("d", path);
var coordinates = [
projection([-74, 40]), // new york
projection([37, 55]) // moscow
];
var line = svg.append("path")
.datum(coordinates)
.attr("d", function(c) {
var d = {
source: c[0],
target: c[1]
};
var dx = d.target[0] - d.source[0],
dy = d.target[1] - d.source[1],
dr = Math.sqrt(dx * dx + dy * dy);
return "M" + d.source[0] + "," + d.source[1] + "A" + dr + "," + dr +
" 0 0,1 " + d.target[0] + "," + d.target[1];
})
.style("stroke", "steelblue")
.style("stroke-width", 5)
.style("fill", "none")
.transition()
.duration(5000)
.attrTween("stroke-dasharray", function() {
var len = this.getTotalLength();
return function(t) {
return (d3.interpolateString("0," + len, len + ",0"))(t)
};
})
.on('end', function(d) {
var c = coordinates[1];
svg.append('circle')
.attr('cx', c[0])
.attr('cy', c[1])
.attr('r', 0)
.style('fill', 'red')
.style('fill-opacity', '0.5')
.transition()
.duration(2000)
.attr('r', 50)
.on('end', function(d) {
d3.select(this)
.transition()
.duration(2000)
.attr('r', 10);
});
});
});
</script>
您好！你會知道這個答案：https://stackoverflow.com/questions/43696831/why-dont-the-flags-appear？ – Coder1000
該行之間不準確。赤道上的繪圖導致向北偏移 – jolly
@pksingh，您需要更具體或提供示例。我更新了上面的代碼，從紐約運行到里約熱內盧（「赤道上空」）。看起來對我很準確。 – Mark