I am trying to implement the zooming feature on a dendrogram in the simplest, most basic way and have gotten it to work. The only issue is that the zoom event only works when the cursor is over an edge, a node, or text. How do I allow zooming when the cursor is on any portion of the svg?
var margin = {top: 20, right: 120, bottom: 20, left: 120},
width = 2000 - margin.right - margin.left,
height = 2000 - margin.top - margin.bottom;
var x = d3.scale.linear()
.domain([0, width])
.range([0, width]);
var y = d3.scale.linear()
.domain([0, height])
.range([height, 0]);
var tree = d3.layout.tree()
.size([height, width])
.separation(function(a, b) { return (a.parent == b.parent ? 1 : 2) / a.depth; });
var diagonal = d3.svg.diagonal()
.projection(function(d) { return [d.y, d.x]; });
var svg = d3.select("body").append("svg")
.attr("width", width + margin.right + margin.left)
.attr("height", height + margin.top + margin.bottom)
.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")")
.attr("pointer-events", "all")
.append('svg:g')
.call(d3.behavior.zoom()
.x(x)
.y(y)
.scaleExtent([1,8])
.on("zoom", zoom))
.append('svg:g');
function zoom(d) {
svg.attr("transform",
"translate(" + d3.event.translate + ")"
+ " scale(" + d3.event.scale + ")");
}
d3.json("flare.json", function(error, root) {
var nodes = tree.nodes(root),
links = tree.links(nodes);
var link = svg.selectAll(".link")
.data(links)
.enter().append("path")
.attr("class", "link")
.attr("d", diagonal);
var node = svg.selectAll(".node")
.data(nodes)
.enter().append("g")
.attr("class", "node")
// .attr("transform", function(d) { return "rotate(" + (d.x - 90) + ")translate(" + d.y + ")"; })
.attr("transform", function(d) { return "translate(" + d.y + "," + d.x + ")"; })
node.append("circle")
.attr("r", 4.5);
node.append("text")
.attr("dy", ".31em")
.attr("text-anchor", function(d) { return d.children || d._children ? "end" : "start"; })
// .attr("transform", function(d) { return d.x < 180 ? "translate(8)" : "rotate(180)translate(-8)"; })
.text(function(d) { return d.name; });
});
d3.select(self.frameElement).style("height", "800px");
I have been using the following jsfiddle as a guide and cannot see where the difference is: http://jsfiddle.net/nrabinowitz/QMKm3/
Thanks in advance.