It's been exactly 2 years since i started to learn Angular and it's sad that i dint write even a single blog on the same. Finally decided to start a series on the same topic. AngularJS is a JavaScript MVC Framework that integrates two-way data binding, web services, and build web components. There are enough number of blogs and tutorials to follow on the same.
The current product which i am working is a data visualization tool which is built on AngularJS and has many visualization been integrated with
D3.js.
In this blog, will be describing how to build a directive using d3.js and angular.
Directive is very powerful feature of AngularJS. It easily wired up with controller, html and do the DOM manipulations.
Building a Decomposition Force directed d3 directive:
App.directive('forceGraph', function() {
return {
restrict: 'EA',
transclude: true,
scope: {
chartData: '='
},
controller: 'hierarchySummaryCtrl',
link: function(scope, elem, attrs) {
var svg;
elem.bind("onmouseover", function(event) {
scope.svg = svg;
console.log("hierarchy svg", scope.svg);
scope.$apply();
});
scope.$watch('chartData', function(newValue, oldValue) {
if (newValue) {
scope.draw(newValue.data,newValue.id);
}
});
scope.draw = function(rootData,divID) {
var width = 400,
height = 320,
root;
var force = d3.layout.force()
.linkDistance(80)
.charge(-120)
.gravity(.05)
.size([width, height])
.on("tick", tick);
var divid = "#" + divID;
d3.select(divid).selectAll("*").remove();
svg = d3.select(divid)
.append("svg").attr("viewBox", "0 0 400 400")
.attr("width", '100%')
.attr("height", '100%');
var link = svg.selectAll(".link"),
node = svg.selectAll(".node");
root = rootData;
update();
console.log(svg);
scope.setSvg(svg[0][0].innerHTML);
function update() {
console.log(nodes)
var nodes = flatten(root),
links = d3.layout.tree().links(nodes);
var nodes = flatten(rootData),
links = d3.layout.tree().links(nodes);
force.nodes(nodes)
.links(links)
.start();
// Update links.
link = link.data(links, function(d) {
return d.target.id;
});
link.exit().remove();
link.enter().insert("line", ".node")
.attr("class", "link");
// Update nodes.
node = node.data(nodes, function(d) {
return d.id;
});
node.exit().remove();
var nodeEnter = node.enter().append("g")
.attr("class", "node")
.on("click", click)
.call(force.drag);
nodeEnter.append("circle")
.attr("r", function(d) {
return Math.sqrt(d.size) / 5 || 4.5;
});
nodeEnter.append("text")
.attr("dy", ".25em")
.text(function(d) {
return d.name + ", Count: " + d.size;
});
node.select("circle")
.style("fill", color);
}
function tick() {
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("transform", function(d) {
return "translate(" + d.x + "," + d.y + ")";
});
}
function color(d) {
return d._children ? "#FFEB3B" // collapsed package
:
d.children ? "#F44336" // expanded package
:
"#D32F2F"; // leaf node
}
// Toggle children on click.
function click(d) {
if (d3.event.defaultPrevented) return; // ignore drag
if (d.children) {
d._children = d.children;
d.children = null;
} else {
d.children = d._children;
d._children = null;
}
update();
}
// Returns a list of all nodes under the root.
function flatten(root) {
var nodes = [],
i = 0;
function recurse(node) {
if (node.children) node.children.forEach(recurse);
if (!node.id) node.id = ++i;
nodes.push(node);
}
recurse(root);
return nodes;
}
};
}
};
});
My Repository With the
sample
