D3.js brush.move() Function

24 Aug, 2020
The brush.move() Function in D3.js is used to set the active selection of the brush on the specified group.
Syntax:
brush.move(group, selection);
Parameters: This function accepts a single parameter as mentioned above and described below
group: This parameter is the specified group on which brush is implemented.
selection: This parameter is an array of numbers.
Return Value: This function returns the array that defines the brush selection for that element.
Below programs illustrate the brush.move() function in D3.js
Example 1:
<!DOCTYPE html>  <html>          <head>              <script src=        "https://d3js.org/d3.v5.min.js">    </script> </head>      <body>      <center>        <h1 style="color:green;">GeeksForGeeks</h1>        <h3>D3.js | brush.move() Function  </h3>                  <button>Click</button>        <br>        <br>        <svg style="background-color: lightgreen;"              width="500" height="100">                              </svg>                   <script>                            // Selecting SVG element             const svg = d3.select("svg");                          const g = svg.append("g");                          // Creating a brush using the              // d3.brush function             g.call(d3.brush());                          // Use of brush.move() function            d3.select("button").on("click", function() {                g.call(d3.brush().move, [                    [100, 0],                    [400, 100]                ])            });             </script>      </center></body>      </html>
Output:
Media error: Format(s) not supported or source(s) not found
Example 2:
<!DOCTYPE html>  <html>          <head>      <meta charset="utf-8">      <script src=        "https://d3js.org/d3.v4.min.js">    </script>           <style>          circle {      fill-opacity: 0.2;    }          circle.active {      fill-opacity: 0.8;      stroke: red;      fill: green;    }          </style></head>      <body>      <center>        <h1 style="color:green;">GeeksForGeeks</h1>        <h3>D3.js | brush.move() Function  </h3>                  <svg width="600" height="300"></svg>                  <script>              var data = d3.range(100).map(Math.random);              var svg = d3.select("svg"),                margin = {top: 50, right: 50,                bottom: 50, left: 50},                width = +svg.attr("width") -                 margin.left - margin.right,                height = +svg.attr("height") -                 margin.top - margin.bottom,                g = svg.append("g")                    .attr("transform", "translate("                     + margin.left + ", " + margin.top + ")"                    );              var x = d3.scaleLinear().range([0, width]),                y = d3.randomNormal(height / 2, height / 8);              var brush = d3.brushX()                .extent([[0, 0], [width, height]])                .on("start brush end", brushmoved);              g.append("g")                .attr("class", "axis axis--x")                .attr("transform", "translate(0, 0)")                .call(d3.axisTop(x));              var circle = g.append("g")                .attr("class", "circle")              .selectAll("circle")              .data(data)              .enter().append("circle")                .attr("transform", function (d) {                     return "translate("                     + x(d) + ", " + y() + ")";                 })                .attr("r", 10);              var gBrush = g.append("g")                .attr("class", "brush")                .call(brush);              gBrush.call(brush.move, [0.3, 0.5].map(x));              var bs = "";            function brushmoved() {              var s = d3.event.selection;                              if (d3.event.type === "start"){                bs = d3.event.selection;              } else if (d3.event.type === "end"){                if (bs[0] !== s[0] && bs[1] !== s[1]) {                  console.log('moved both');                } else if (bs[0] !== s[0]) {                  console.log('moved left');                } else {                  console.log('moved right');                }              }                              if (s == null) {                handle.attr("display", "none");                circle.classed("active", false);              } else {                var sx = s.map(x.invert);                circle.classed("active", function (d) {                    return sx[0] <= d && d <= sx[1];                 });                handle.attr("display", null)                .attr("transform", function (d, i) {                    return "translate("                    + s[i] + ", " + height / 2 + ")";                 });              }            }                      </script>      </center></body>      </html>  
Output:
Media error: Format(s) not supported or source(s) not found
D3.js
JavaScript
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