Javascript D3中图形的缩放
我有javascript代码,它使用json文件中存储的数据绘制图形Javascript D3中图形的缩放,javascript,json,d3.js,zooming,force-layout,Javascript,Json,D3.js,Zooming,Force Layout,我有javascript代码,它使用json文件中存储的数据绘制图形 <!DOCTYPE html xmlns:xlink="http://www.w3.org/1999/xlink"> <meta charset="utf-8"> <style> // style here </style> <body> <script src="http://d3js.org/d3.v3.min.js"></script>
<!DOCTYPE html xmlns:xlink="http://www.w3.org/1999/xlink">
<meta charset="utf-8">
<style>
// style here
</style>
<body>
<script src="http://d3js.org/d3.v3.min.js"></script>
<div id="animviz"></div>
<script>
var vv = window,
w = vv.innerWidth,
h = vv.innerHeight;
var x = d3.scale.linear()
.domain([0, w])
.range([0, w]);
var y = d3.scale.linear()
.domain([0, h])
.range([h, 0]);
var svg = d3.select("#animviz")
.append("svg")
.attr("width", w)
.attr("height", h)
.append("g")
var color = d3.scale.category10();
var force = d3.layout.force()
.charge(-200)
.linkDistance(50)
.size([w, h]);
d3.json("post000.json", function(error, graph) {
force
.nodes(graph.nodes)
.links(graph.links)
.start();
var link = svg.selectAll(".link")
.data(graph.links)
.enter().append("line")
.attr("class", "link")
var myMouseoverFunction = function() {
var circle = d3.select(this);
circle.transition().duration(100)
.attr("r", 20 )
node.append("title")
.text(function(d) { return d.name});
}
var myMouseoutFunction = function() {
var circle = d3.select(this);
circle.transition().duration(500)
.attr("r", 10 );
}
var node = svg.selectAll(".node")
.data(graph.nodes)
.enter().append("circle")
.attr("class", "node")
.attr("r", 10)
.attr("transform", transform)
.style("fill", function(d) { return color(d.group); })
.call(force.drag)
.on("mouseover", myMouseoverFunction)
.on("mouseout", myMouseoutFunction);
force.on("tick", function() {
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; });
node.attr("cx", function(d) { return d.x; })
.attr("cy", function(d) { return d.y; });
});
});
</script>
</body>
但是,我无法在浏览器中放大或缩小此图形。我计划从文件中使用;然而,在我的例子中,我使用异步的d3.json从post000.json加载数据,我不确定在加载该数据时如何访问该数据,以将其作为输入传递给zoom函数
如何绘制一个可以放大json中存储的数据的图形?以下是适用于我的代码:
<!DOCTYPE html xmlns:xlink="http://www.w3.org/1999/xlink">
<meta charset="utf-8">
<style>
// style here
</style>
<body>
<script src="http://d3js.org/d3.v3.min.js"></script>
<div id="animviz"></div>
<script>
d3.json("post000.json", function(error, graph) {
var vv = window,
w = vv.innerWidth,
h = vv.innerHeight;
var svg = d3.select("#animviz")
.append("svg")
.attr("width", w)
.attr("height", h)
.append("g")
.call(d3.behavior.zoom().scaleExtent([0, 8]).on("zoom", zoom))
.append("g");
var color = d3.scale.category10();
var force = d3.layout.force()
.charge(-200)
.linkDistance(50)
.size([w, h]);
force
.nodes(graph.nodes)
.links(graph.links)
.start();
var link = svg.selectAll(".link")
.data(graph.links)
.enter().append("line")
.attr("class", "link")
.attr("transform", function(d) { return "translate(" + d + ")"; });
function zoom() {
svg.attr("transform", "translate(" + d3.event.translate + ")scale(" + d3.event.scale + ")");
}
var myMouseoverFunction = function() {
var circle = d3.select(this);
circle.transition().duration(100)
.attr("r", 20 )
node.append("title")
.text(function(d) { return d.name});
}
var myMouseoutFunction = function() {
var circle = d3.select(this);
circle.transition().duration(500)
.attr("r", 10 );
}
var node = svg.selectAll(".node")
.data(graph.nodes)
.enter().append("circle")
.attr("class", "node")
.attr("r", 10)
.style("fill", function(d) { return color(d.group); })
.call(force.drag)
.on("mouseover", myMouseoverFunction)
.on("mouseout", myMouseoutFunction);
force.on("tick", function() {
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; });
node.attr("cx", function(d) { return d.x; })
.attr("cy", function(d) { return d.y; });
});
});
</script>
</body>
只需在回调中设置缩放。您能详细说明一下吗?如果您从示例开始,您可以将其整个代码放入回调处理程序中。我不能,因为我还定义了回调外部的变量。您可以将这些变量移到回调中。