Cacatoo - Lotka Volterra

by bramvandijk88

HTML

<!-- 
  ###########################################################################################
    This is a JSFiddle example of "Cacatoo". This HTML page does not contain the code itself,
    but determines where the grids, graphs, buttons, etc are placed. The real code is in the 
    Javascript Tab. I recommend enabling "Tabs (Columns)" under the settings in the top-right. 
  ###########################################################################################
-->

<html>
  <script src="https://bramvandijk88.github.io/cacatoo/scripts/cacatoo.js"></script>
	  <script src="https://bramvandijk88.github.io/cacatoo/scripts/all.js"></script>  <!-- Dependencies
    <link rel="stylesheet" href="style.css">        <!-- Set style sheet -->

  <head>
    <title>Cacatoo examples</title>
  </head>


  <script>
    /*-------------------------End user-defined code ---------------------*/

  </script>

  <body onload="cacatoo()">
    <div class="header" id="header">
      <h2>Cacatoo (example project)</h2>
    </div>

    <div class="content" id="canvas_holder"> </div>
    <div class="content" id="graph_holder"> </div>
    <div class="content" id="form_holder"></div>
    <div class="output" id="output"></div>
    <div class="footer" id="footer"></div>

  </body>

</html>

CSS

* {
	color:black;
}


body {
  font-family: 'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, sans-serif;
  background-color: #BBBBBB;
  margin: 10px;
  font-size: 13px;
}

/* Style the header */
.header {
  background-color: rgb(108, 62, 122);
  display: block;
  border: 0px solid #FFFFFF;
  /*box-shadow: 3px 1px 0px #24242444;*/
  border-radius: 15px 15px 0px 0px;
  padding: 10px;
  text-align: center;
  font-size: 20px;
  font-weight: 900;
  color: #ffffff;
}


.logos {
  z-index: -1;
  vertical-align: middle;
  display: inline-block;
  padding-left: 10px;
  padding-top: 10px;
}

.example_card {
  width: 220px;
  height: 220px;
  background-color: rgb(151, 183, 204);
  box-shadow: rgba(100, 100, 111, 0.1) 20px 7px 29px 0px;
  /* font-weight: bold; */
  color: rgb(229, 239, 245);
  font-size: 12px;
  line-height: 25px;
  margin: 25px;
  padding: 20px;
  padding-bottom: 40px;
  padding-top: 10px;
  border-radius: 0px 0px 0px 0px;
  display: inline-block;
  transition: all 100ms ease-out 200ms;
  transition-delay: 0s;
}

.example_card_img {
  width: 100%;
  height: 100%;
  border-radius: 0px 0px 0px 0px;
  background-position: 45% 50%;
  background-repeat: no-repeat;
  background-size: cover;
}

.example_card:hover {
  background-color: rgb(151, 183, 204);
  font-size: 12px;
  color: black;
  border-radius: 30px 0px 30px 0px;
  box-shadow: rgba(100, 100, 111, 0.3) 0px 0px 29px 0px;
}

.example_card:active {
  background-color: rgb(151, 183, 204);
  font-size: 12px;
  padding-top: 11px;
  height: 199px;
  color: black;
  box-shadow: rgba(100, 100, 111, 0.3) 0px 0px 29px 0px;
}


/* Content (grid, graphs, sliders) */
.content {
  text-align: center;
  /*box-shadow: 3px 1px 0px #24242444;*/
  /*border-bottom: 1px dashed #88888844;*/
  background-color: #e2e2e2;
  padding: 10px;
}

/* Output div */
.output {
  border-radius: 8px 8px 8px 8px;
  margin: 30px;
  height: 300px;
  overflow-y: scroll;
  font-size: 11px;
 ...

JavaScript

/*-----------------------Start user-defined code ---------------------*/

    let sim;

    function cacatoo() {

        let config = {
            title: "ODEs in gridpoints",
            description: "Diffusion-coupled predator prey system (Lotka-Volterra)<br> <font size=1> A catastrophy kills some predators at time step 50.</font>",
            maxtime: 1000000,
            ncol: 64,
            nrow: 64,		            // dimensions of the grid to build
            wrap: [true, true],         // Wrap boundary [COLS, ROWS]   
            scale: 3,				    // scale of the grid (nxn pixels per grid cell
        }

        sim = new Simulation(config)

        sim.makeGridmodel("lotka");

        sim.lotka.colourGradient('numpred', 100, [0, 0, 0], [240, 200, 0])                         // Will contain the ODEs, and show the abundance of PREDATORS
        sim.lotka.colourGradient('numprey', 100, [0, 0, 0], [148, 0, 211])                         // Will contain the ODEs, and show the abundance of PREDATORS

        sim.createDisplay_continuous({model:"lotka", property:"numpred", label:"Local predator density", // Createa a display for a continuous variable (ODE state for external resources)
                            minval:0, maxval:200})        
        sim.createDisplay_continuous({model:"lotka", property:"numprey", label:"Local prey density", // Createa a display for a continuous variable (ODE state for external resources)
                            minval:0, maxval:200}) 

        // Define a basic Lotka Volterra ODE system
        // dn/dt = a n - b n p
        // dp/dt = c n p - d p
        let LotkaVolterra = function (a, b, c, d) {
            return function (n, p) {
                return [
                    a * p[0] - b * p[0] * p[1],         // p[0] is the prey which replicates with rate a, and gets consumed by the predator with rate b
                    c * p[0] * p[1] - d * p[1]          // p[1] is the predator which consumes prey with rate c,...