Exploring the creation of a dynamic graph with d3.js

Question

Exploring the creation of a dynamic graph with d3.js

I'm new to d3 and attempting to create a graph layout.

        var w = 1000;
        var h = 500;
        var dataset = {
            nodes: [{
                name: 'Alice'
            }, {
                name: 'David'
            }, {
                name: 'Eve'
            }],
            edges: [{
                source: 0,
                target: 1
            }, {
                source: 1,
                target: 2
            }]
        };
        var svg = d3.select("body")
            .append("svg")
            .attr("height", h)
            .attr("width", w);

        var force = d3.layout.force()
            .nodes(dataset.nodes)
            .links(dataset.edges)
            .size([w, h])
            .linkDistance([50])
            .start();

        var nodes = svg.selectAll("circle")
            .data(dataset.nodes)
            .enter()
            .append("circle")
            .attr("r", 10)
            .style("fill", "blue")
            .call(force.drag);

        var edges = svg.selectAll("line")
            .data(dataset.edges)
            .enter()
            .append("line")
            .style("stroke", "#999")
            .style("stroke-width", 2);

You can view my fiddle here: http://jsfiddle.net/username/example/

I'm having trouble getting the graph to display correctly. Any advice or suggestions would be greatly appreciated.

javascript d3.js force-layout directed-graph

Answer 1

Answer №1

1. Ensure that the cx and cy of the circle are set in order to position it correctly. 2. Set x1, y1, x2, and y2 of the line to properly position the line.

3. To activate the layout, listen for the tick event of the force layout.

            
var w = 300;
var h = 300; 
var dataset = {
    nodes: [{
        name: 'Aden'
    }, {
        name: 'Bob'
    }, {
        name: 'Sue'
    }],
    edges: [{
        source: 0,
        target: 1
    }, {
        source: 1,
        target: 2
    }]
};
var svg = d3.select("body")
    .append("svg")
    .attr("height", h)
    .attr("width", w);

var force = d3.layout.force()
    .nodes(dataset.nodes)
    .links(dataset.edges)
    .size([w, h])
    .on("tick", tick) 
    .linkDistance([50])
    .start();

var nodes = svg.selectAll("circle")
    .data(dataset.nodes)
    .enter()
    .append("circle")
    .attr("r", 10)
    .attr("cx", function (d) {return d.x; })
    .attr("cy", function (d) { return d.y; })
    .style("fill", "red")
    .call(force.drag);

var edges = svg.selectAll("line")
    .data(dataset.edges)
    .enter()
    .append("line")
    .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;
    })
    .style("stroke", "#ccc")
    .style("stroke-width", 1);

function tick(e) {
     edges.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; });

  nodes.attr("cx", function(d) { return d.x; })
      .attr("cy", function(d) { return d.y; });
}

Demo Update: http://jsfiddle.net/MnX23/3/

Answer 2

1. Ensure that the cx and cy of the circle are set in order to position it correctly. 2. Set x1, y1, x2, and y2 of the line to properly position the line.

3. To activate the layout, listen for the tick event of the force layout.

            
var w = 300;
var h = 300; 
var dataset = {
    nodes: [{
        name: 'Aden'
    }, {
        name: 'Bob'
    }, {
        name: 'Sue'
    }],
    edges: [{
        source: 0,
        target: 1
    }, {
        source: 1,
        target: 2
    }]
};
var svg = d3.select("body")
    .append("svg")
    .attr("height", h)
    .attr("width", w);

var force = d3.layout.force()
    .nodes(dataset.nodes)
    .links(dataset.edges)
    .size([w, h])
    .on("tick", tick) 
    .linkDistance([50])
    .start();

var nodes = svg.selectAll("circle")
    .data(dataset.nodes)
    .enter()
    .append("circle")
    .attr("r", 10)
    .attr("cx", function (d) {return d.x; })
    .attr("cy", function (d) { return d.y; })
    .style("fill", "red")
    .call(force.drag);

var edges = svg.selectAll("line")
    .data(dataset.edges)
    .enter()
    .append("line")
    .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;
    })
    .style("stroke", "#ccc")
    .style("stroke-width", 1);

function tick(e) {
     edges.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; });

  nodes.attr("cx", function(d) { return d.x; })
      .attr("cy", function(d) { return d.y; });
}

Demo Update: http://jsfiddle.net/MnX23/3/

Answer 3

Answer №2

When working with circles in SVG, it is important to specify the attributes cx and cy, as well as the line attributes x1,y1,x2,y2.

The x1 attribute determines the starting point of the line on the x-axis
The y1 attribute determines the starting point of the line on the y-axis
The x2 attribute determines the ending point of the line on the x-axis
The y2 attribute determines the ending point of the line on the y-axis

Feel free to test out this code:

DEMO

   var width = 1000;
        var height = 500;
        var data = {
            nodes: [{
                name: 'Aden'
            }, {
                name: 'Bob'
            }, {
                name: 'Sue'
            }],
            edges: [{
                source: 0,
                target: 1
            }, {
                source: 1,
                target: 2
            }]
        };
        var svgCanvas = d3.select("body")
            .append("svg")
            .attr("height", height)
            .attr("width", width);

        var simulation = d3.layout.force()
            .nodes(data.nodes)
            .links(data.edges)
            .size([width, height])
            .linkDistance([50])
            .start();

        var nodeElements = svgCanvas.selectAll("circle")
            .data(data.nodes)
            .enter()
            .append("circle")
            .attr("r", 10)
            .style("fill", "red")

            .call(simulation.drag);

        var edgeElements = svgCanvas.selectAll("line")
            .data(data.edges)
            .enter()
            .append("line")

            .style("stroke", "#ccc")
            .style("stroke-width", 1);

       simulation.on("tick", function() {
       edgeElements.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; });

      nodeElements.attr("cx", function(d) { return d.x; })
                  .attr("cy", function(d) { return d.y; });
            });

Answer 4

When working with circles in SVG, it is important to specify the attributes cx and cy, as well as the line attributes x1,y1,x2,y2.

The x1 attribute determines the starting point of the line on the x-axis
The y1 attribute determines the starting point of the line on the y-axis
The x2 attribute determines the ending point of the line on the x-axis
The y2 attribute determines the ending point of the line on the y-axis

Feel free to test out this code:

DEMO

   var width = 1000;
        var height = 500;
        var data = {
            nodes: [{
                name: 'Aden'
            }, {
                name: 'Bob'
            }, {
                name: 'Sue'
            }],
            edges: [{
                source: 0,
                target: 1
            }, {
                source: 1,
                target: 2
            }]
        };
        var svgCanvas = d3.select("body")
            .append("svg")
            .attr("height", height)
            .attr("width", width);

        var simulation = d3.layout.force()
            .nodes(data.nodes)
            .links(data.edges)
            .size([width, height])
            .linkDistance([50])
            .start();

        var nodeElements = svgCanvas.selectAll("circle")
            .data(data.nodes)
            .enter()
            .append("circle")
            .attr("r", 10)
            .style("fill", "red")

            .call(simulation.drag);

        var edgeElements = svgCanvas.selectAll("line")
            .data(data.edges)
            .enter()
            .append("line")

            .style("stroke", "#ccc")
            .style("stroke-width", 1);

       simulation.on("tick", function() {
       edgeElements.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; });

      nodeElements.attr("cx", function(d) { return d.x; })
                  .attr("cy", function(d) { return d.y; });
            });

Exploring the creation of a dynamic graph with d3.js

Answer №1

Answer №2

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