在Google地图叠加层上,如何在D3中的svg元素之间创建线 [英] On a Google maps overlay, how do I create lines between svg elements in D3
问题描述
我是D3的新手,我想调用我的函数drawlink来绘制我的一些元素之间的线。我尝试添加每个调用我的链接变量来调用它,即:
var link = layer.selectAll )
.data(data.links)
.enter()。append(line)
.attr(class,link)
.each drawlink);
但不起作用。在添加该行之前,我已经得到了Google地图绘制和绘制了我的4个svg元素的阶段。
我应该怎么做?
{
nodes:[
{name:A,long:0.0000,lat:51.4800},
{name:B long: - 0.1684,lat:51.4875},
{name:C,long: - 0.2043,lat:51.5096},
{name: D,long: - 0.1269,lat:51.5295}
],
links:[
{source:0,target:1} b $ b {source:0,target:2},
{source:0,target:3},
{source:2,target 3}
]
}
index.html
<!DOCTYPE html>
< meta charset =utf-8>
< meta name =viewportcontent =initial-scale = 1.0,user-scalable = no/>
< html>
< head>
< script src =http://maps.google.com/maps/api/js?sensor=false>< / script>
< script src =http://d3js.org/d3.v3.min.js>< / script>
< style>
html,body,#map {
width:100%;
height:100%;
margin:0;
padding:0;
}
.link {
stroke:#ccc;
stroke-width:1.5px;
}
.stations ,.stations svg {
position:absolute;
}
.stations svg {
width:60px;
height:20px;
padding-right:100px;
font:12px sans-serif;
}
.stations circle {
fill:brown;
stroke:black;
stroke-width:1.5px;
}
< / style>
< / head>
< body>
< div id =mapstyle =width:1200px; height:600px;>< / div>
< script type =text / javascript>
//创建Google Map ...
var map = new google.maps.Map(d3.select(#map)。node(),{
zoom: 12,
center:new google.maps.LatLng(51.5195,-0.1269),
mapTypeId:google.maps.MapTypeId.TERRAIN
});
d3.json(stations.json,function(error,data){
if(error)throw error;
var overlay = new google。 maps.OverlayView();
overlay.onAdd = function(){
var layer = d3.select(this.getPanes()。overlayLayer).append(div)
.attr(class,stations);
overlay.draw = function(){
var projection = this.getProjection(),
padding = 10 ;
var node = layer.selectAll(。stations)
.data(data.nodes)
.each(transform)
.enter append(svg)
.each(transform)
.attr(class,node);
var link = layer.selectAll )
.data(data.links)
.enter()。append(line)
.attr(class,link);
$ b b node.append(circle)
.attr(r,4.5)
.attr(cx,padding)
.attr(cy,padding);
node.append(text)
.attr(x,padding + 7)
.attr(y,padding)
.attr dy,.31em)
.text(function(d){return d.name; });
function transform(d){
d = new google.maps.LatLng(d.lat,d.long);
d = projection.fromLatLngToDivPixel(d);
return d3.select(this)
.style(left,(dx - padding)+px)
.style(top px);
}
function drawlink(d){
link.attr(x1,function(d){return d.source.x;})
。 attr(y1,function(d){return d.source.y;})
.attr(x2,function(d){return d.target.x;})
。 attr(y2,function(d){return d.target.y;});
}
};
};
overlay.setMap(map);
});
< / script>
< / body>
< / html>
而不是在每个站点附加 svg
,我会附加一个 svg
(如果你需要从站到站,你必须这样做),然后在每个站点附加一个 g
。然后这些线是一个简单的循环你的链接,计算位置和添加线:
以下是3个主要的定位功能:
function latLongToPos(d){
var p = new google.maps.LatLng(d.lat,d.long);
p = projection.fromLatLngToDivPixel(p);
p.x = p.x - padding;
p.y = p.y - padding;
return p;
}
函数transform(d){
var p = latLongToPos(d);
return d3.select(this)
.attr(transform,translate(+ p.x +,+ p.y +));
}
function drawlink(d){
var p1 = latLongToPos(data.nodes [d.source]),
p2 = latLongToPos(data.nodes [ d.target]);
d3.select(this)
.attr('x1',p1.x)
.attr('y1',p1.y)
.attr('x2' ,p2.x)
.attr('y2',p2.y)
.style('fill','none')
.style('stroke','steelblue') ;
完整代码:
<!DOCTYPE html>< meta charset =utf-8>< meta name =viewportcontent =initial-scale = 1.0,user -scalable = no/>< html>< head> < script src =http://maps.google.com/maps/api/js?sensor=false>< / script> < script src =http://d3js.org/d3.v3.min.js>< / script> < style> html,body,#map {width:100%;高度:100%; margin:0; padding:0; } .link {stroke:#ccc; stroke-width:1.5px; } .stations,.stations svg {position:absolute; } .stations svg {width:1200px; height:600px; padding-right:100px; font:12px sans-serif; } .stations circle {fill:brown;中风:黑色; stroke-width:1.5px; }< / style>< / head>< body> < div id =mapstyle =width:1200px; height:600px;>< / div> < script type =text / javascript> // Create the Google Map ... var map = new google.maps.Map(d3.select(#map)。node(),{zoom:12,center:new google.maps.LatLng(51.5195,-0.1269) ,mapTypeId:google.maps.MapTypeId.TERRAIN}); //d3.json(\"stations.json,function(error,data){var data = {nodes:[{name:A,long:0.0000,lat:51.4800}, {name:B,long:-0.1684,lat:51.4875},{name:C,long:-0.2043,lat:51.5096} :D,long:-0.1269,lat:51.5295}],links:[{source:0,target:1},{source:0,target 2},{source:0,target:3},{source:2,target:3}]} var overlay = new google.maps.OverlayView(); overlay.onAdd = function ){var layer = d3.select(this.getPanes()。overlayLayer).append(div).attr(class,stations); overlay.draw = function(){layer.select('svg ').remove(); var projection = this.getProjection(),padding = 10; var svg = layer.append(svg).attr('width',1200).attr node = svg.selectAll(。stations).data(data.nodes).enter()。append(g).each(transform).attr(class,node); var link = svg.selectAll(。link).data(data.links).enter()。append(line).attr(class,link)。 node.append(circle).attr(r,4.5); node.append(text).attr(x,7).attr(y,0).attr(dy,.31em).text(function(d){return d.name ;}); function latLongToPos(d){var p = new google.maps.LatLng(d.lat,d.long); p = projection.fromLatLngToDivPixel(p); p.x = p.x - padding; p.y = p.y - padding; return p; } function transform(d){var p = latLongToPos(d); return d3.select(this).attr(transform,translate(+ p.x +,+ p.y +)); } function drawlink(d){var p1 = latLongToPos(data.nodes [d.source]),p2 = latLongToPos(data.nodes [d.target]); d3.select(this).attr('x1',p1.x).attr('y1',p1.y).attr('x2',p2.x).attr('y2',p2.y) .style('fill','none').style('stroke','steelblue'); }}; }; overlay.setMap(map); //}); < / script>< / body>< / html>
I'm new to D3 and I want to call my function drawlink to draw lines between some of my elements. I tried adding an each call to my link variable to call it, i.e.:
var link = layer.selectAll(".link")
.data(data.links)
.enter().append("line")
.attr("class", "link")
.each(drawlink);
but that did not work. Before I add that line I have got the stage where the Google Map has drawn and my 4 svg elements have been drawn.
How should I be doing this ? Other code improvement comments very welcome too.
stations.json
{
"nodes":[
{"name":"A","long":0.0000,"lat":51.4800},
{"name":"B","long":-0.1684,"lat":51.4875},
{"name":"C","long":-0.2043,"lat":51.5096},
{"name":"D","long":-0.1269,"lat":51.5295}
],
"links":[
{"source":0,"target":1},
{"source":0,"target":2},
{"source":0,"target":3},
{"source":2,"target":3}
]
}
index.html
<!DOCTYPE html>
<meta charset="utf-8">
<meta name="viewport" content="initial-scale=1.0, user-scalable=no"/>
<html>
<head>
<script src="http://maps.google.com/maps/api/js?sensor=false"></script>
<script src="http://d3js.org/d3.v3.min.js"></script>
<style>
html, body, #map {
width: 100%;
height: 100%;
margin: 0;
padding: 0;
}
.link {
stroke: #ccc;
stroke-width: 1.5px;
}
.stations, .stations svg {
position: absolute;
}
.stations svg {
width: 60px;
height: 20px;
padding-right: 100px;
font: 12px sans-serif;
}
.stations circle {
fill: brown;
stroke: black;
stroke-width: 1.5px;
}
</style>
</head>
<body>
<div id="map" style="width: 1200px; height: 600px;"></div>
<script type="text/javascript">
// Create the Google Map…
var map = new google.maps.Map(d3.select("#map").node(), {
zoom: 12,
center: new google.maps.LatLng(51.5195, -0.1269),
mapTypeId: google.maps.MapTypeId.TERRAIN
});
d3.json("stations.json", function(error, data) {
if (error) throw error;
var overlay = new google.maps.OverlayView();
overlay.onAdd = function() {
var layer = d3.select(this.getPanes().overlayLayer).append("div")
.attr("class", "stations");
overlay.draw = function() {
var projection = this.getProjection(),
padding = 10;
var node = layer.selectAll(".stations")
.data(data.nodes)
.each(transform)
.enter().append("svg")
.each(transform)
.attr("class", "node");
var link = layer.selectAll(".link")
.data(data.links)
.enter().append("line")
.attr("class", "link");
node.append("circle")
.attr("r", 4.5)
.attr("cx", padding)
.attr("cy", padding);
node.append("text")
.attr("x", padding + 7)
.attr("y", padding)
.attr("dy", ".31em")
.text(function(d) { return d.name; });
function transform(d) {
d = new google.maps.LatLng(d.lat, d.long);
d = projection.fromLatLngToDivPixel(d);
return d3.select(this)
.style("left", (d.x - padding) + "px")
.style("top", (d.y - padding) + "px");
}
function drawlink(d) {
link.attr("x1", function(d) { return d.source.x; })
.attr("y1", function(d) { return d.source.y; })
.attr("x2", function(d) { return d.target.x; })
.attr("y2", function(d) { return d.target.y; });
}
};
};
overlay.setMap(map);
});
</script>
</body>
</html>
I'd make a slight deviation in your approach. Instead of appending an svg
per station, I'd append a single svg
(if you need to draw lines from station to station you'll have to do this) and then append a g
per station. The lines then are an easy loop over your links, calculate position and add the lines:
Here's the 3 main positioning functions then:
function latLongToPos(d){
var p = new google.maps.LatLng(d.lat, d.long);
p = projection.fromLatLngToDivPixel(p);
p.x = p.x - padding;
p.y = p.y - padding;
return p;
}
function transform(d) {
var p = latLongToPos(d);
return d3.select(this)
.attr("transform","translate(" + p.x + "," + p.y + ")");
}
function drawlink(d) {
var p1 = latLongToPos(data.nodes[d.source]),
p2 = latLongToPos(data.nodes[d.target]);
d3.select(this)
.attr('x1', p1.x)
.attr('y1', p1.y)
.attr('x2', p2.x)
.attr('y2', p2.y)
.style('fill', 'none')
.style('stroke', 'steelblue');
Full code:
<!DOCTYPE html>
<meta charset="utf-8">
<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
<html>
<head>
<script src="http://maps.google.com/maps/api/js?sensor=false"></script>
<script src="http://d3js.org/d3.v3.min.js"></script>
<style>
html,
body,
#map {
width: 100%;
height: 100%;
margin: 0;
padding: 0;
}
.link {
stroke: #ccc;
stroke-width: 1.5px;
}
.stations,
.stations svg {
position: absolute;
}
.stations svg {
width: 1200px;
height: 600px;
padding-right: 100px;
font: 12px sans-serif;
}
.stations circle {
fill: brown;
stroke: black;
stroke-width: 1.5px;
}
</style>
</head>
<body>
<div id="map" style="width: 1200px; height: 600px;"></div>
<script type="text/javascript">
// Create the Google Map…
var map = new google.maps.Map(d3.select("#map").node(), {
zoom: 12,
center: new google.maps.LatLng(51.5195, -0.1269),
mapTypeId: google.maps.MapTypeId.TERRAIN
});
//d3.json("stations.json", function(error, data) {
var data = {
"nodes": [{
"name": "A",
"long": 0.0000,
"lat": 51.4800
}, {
"name": "B",
"long": -0.1684,
"lat": 51.4875
}, {
"name": "C",
"long": -0.2043,
"lat": 51.5096
}, {
"name": "D",
"long": -0.1269,
"lat": 51.5295
}],
"links": [{
"source": 0,
"target": 1
}, {
"source": 0,
"target": 2
}, {
"source": 0,
"target": 3
}, {
"source": 2,
"target": 3
}]
}
var overlay = new google.maps.OverlayView();
overlay.onAdd = function() {
var layer = d3.select(this.getPanes().overlayLayer).append("div")
.attr("class", "stations");
overlay.draw = function() {
layer.select('svg').remove();
var projection = this.getProjection(),
padding = 10;
var svg = layer.append("svg")
.attr('width', 1200)
.attr('height', 600)
var node = svg.selectAll(".stations")
.data(data.nodes)
.enter().append("g")
.each(transform)
.attr("class", "node");
var link = svg.selectAll(".link")
.data(data.links)
.enter().append("line")
.attr("class", "link")
.each(drawlink);
node.append("circle")
.attr("r", 4.5);
node.append("text")
.attr("x", 7)
.attr("y", 0)
.attr("dy", ".31em")
.text(function(d) {
return d.name;
});
function latLongToPos(d) {
var p = new google.maps.LatLng(d.lat, d.long);
p = projection.fromLatLngToDivPixel(p);
p.x = p.x - padding;
p.y = p.y - padding;
return p;
}
function transform(d) {
var p = latLongToPos(d);
return d3.select(this)
.attr("transform", "translate(" + p.x + "," + p.y + ")");
}
function drawlink(d) {
var p1 = latLongToPos(data.nodes[d.source]),
p2 = latLongToPos(data.nodes[d.target]);
d3.select(this)
.attr('x1', p1.x)
.attr('y1', p1.y)
.attr('x2', p2.x)
.attr('y2', p2.y)
.style('fill', 'none')
.style('stroke', 'steelblue');
}
};
};
overlay.setMap(map);
//});
</script>
</body>
</html>
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