Delay Start of Force Simulation in JavaScript

by Abdul Rawoof A R Updated: Mar 2, 2023

Guide Kit

Simulation allows us to explore 'what if' questions and their scenarios without experimenting with the system. It helps us to identify bottlenecks in material, product flows, and information, and it also helps us to gain insight into which variables are most important to system performance.

Imitating the operation of a real-world system or the process over time requires using models in a simulation. This model represents the key characteristics or behaviors of the selected system or the process, whereas the simulation represents the evolution of the model over time. The advantages of simulation provide a cost-saving by reducing the requirement for physical prototypes and testing. Instead of having to build and test a product physically, the companies can use simulation software to create a virtual prototype, which can be tested virtually.

The phases of simulation:

Pre-modeling
Model building
Model runs
Experimentation
Final thoughts

Here is an example of a delayed start of force simulation in JavaScript:

Fig : Preview of the output that you will get on running this code from your IDE.

Code

Delay start of force simulation

JavaScriptLines of Code : 171License : Strong Copyleft (CC BY-SA 4.0)

simulation.stop();

setTimeout(function(){
  simulation.restart();
},2000);

<!DOCTYPE html>
<meta charset="utf-8">

<head>
  <title>Force layout (with links)</title>
</head>

<style>
  circle {
    fill: cadetblue;
  }
  
  line {
    stroke: #ccc;
  }
  
  text {
    text-anchor: middle;
    font-family: "Helvetica Neue", Helvetica, sans-serif;
    fill: #666;
    font-size: 16px;
  }
</style>

<body>
  <div id="content">
    <svg width="400" height="300">
      <g class="links"></g>
      <g class="nodes"></g>
    </svg>
  </div>

  <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/4.2.2/d3.min.js"></script>

  <script>
    var width = 400,
      height = 300

    var nodes = [{
        name: 'A'
      },
      {
        name: 'B'
      },
      {
        name: 'C'
      },
      {
        name: 'D'
      },
      {
        name: 'E'
      },
      {
        name: 'F'
      },
      {
        name: 'G'
      },
      {
        name: 'H'
      },
    ]

    var links = [{
        source: 0,
        target: 1
      },
      {
        source: 0,
        target: 2
      },
      {
        source: 0,
        target: 3
      },
      {
        source: 1,
        target: 6
      },
      {
        source: 3,
        target: 4
      },
      {
        source: 3,
        target: 7
      },
      {
        source: 4,
        target: 5
      },
      {
        source: 4,
        target: 7
      }
    ]

    var simulation = d3.forceSimulation(nodes)
      .force('charge', d3.forceManyBody().strength(-100))
      .force('center', d3.forceCenter(width / 2, height / 2))
      .force('link', d3.forceLink().links(links))
      .on('tick', ticked)
      .stop();

    setTimeout(function() {
      simulation.restart();
    }, 2000);

    function updateLinks() {
      var u = d3.select('.links')
        .selectAll('line')
        .data(links)

      u.enter()
        .append('line')
        .merge(u)
        .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
        })

      u.exit().remove()
    }

    function updateNodes() {
      u = d3.select('.nodes')
        .selectAll('text')
        .data(nodes)

      u.enter()
        .append('text')
        .text(function(d) {
          return d.name
        })
        .merge(u)
        .attr('x', function(d) {
          return d.x
        })
        .attr('y', function(d) {
          return d.y
        })
        .attr('dy', function(d) {
          return 5
        })

      u.exit().remove()
    }

    function ticked() {
      updateLinks()
      updateNodes()
    }
  </script>
</body>

</html>

Instructions

Follow the steps carefully to get the output easily.

Install Visual Studio Code IDE.
Create one new html file.
Copy the snippet using the 'copy' and paste it in that html file in your IDE.
Save and run the html file to generate the output.

I hope you found this useful.

I found this code snippet by searching for 'delay start of force simulation' in kandi. You can try any such use case!

Environment Tested

I tested this solution in the following versions. Be mindful of changes when working with other versions.

The solution is created and tested in Visual Studio Code 1.74.1.

Using this solution, we are able to implement delay start of force simulation in javascript with simple steps. This process also facilities an easy way to use, hassle-free method to create a hands-on working version of code which would help us to implement delay start of force simulation in javascript.

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