The density.weight() function is used to set the weight accessor of the density contour estimator function. If the weight is given then this function sets the accessor for the point weights else it sets the accessor to the default value of 1.
Syntax:
d3.contourDensity.x().y().weight([weight]);
Parameters: This function takes one parameter as given above and described below:
- weight: It takes a number that is used to set the accessor for the point weights.
Return Value: This function does not return anything.
Below given are a few examples of the density.weight() function.
Example1:
<!DOCTYPE html> <html lang="en">   <head>     <meta charset="UTF-8">     <meta name="viewport" content="         width=device-width, initial-scale=1.0">       <script type="text/javascript"    </script>     <script src=      </script> </head>   <body>     <h1 style="color:green">neveropen</h1>           <script>           // append the svg object to the body.         var svg = d3.select("body")         .append("svg")             .attr("width", 530)             .attr("height", 480)         .append("g")             .attr("transform",                 "translate(" + 40 + ", " + -80 + ")");           // read data         d3.csv("./data.csv", function(data) {                       var y = d3.scaleLinear()             .domain([2, 30])             .range([ 300, 100 ]);           var x = d3.scaleLinear()             .domain([2, 22])             .range([ 0, 200]);             svg.append("g")         .call(d3.axisLeft(y));                   svg.append("g")             .attr("transform", "translate(0, " + 300 + ")")             .call(d3.axisBottom(x));           var density= d3.contourDensity()             .y(function(d) { return y(d.y); })             .bandwidth(15)             // Use of weight function             .weight(0.007)             .x(function(d) { return x(d.x); })(data)           svg.selectAll("path")             .data(density)             .enter()             .append("path")             .attr("d", d3.geoPath())             .attr("fill", "none")             .attr("stroke", "green")         });           // Data for csv file         // x, y, group         // 9.45, 14.14, H         // 9.1, 14.14, H         // 9.9, 9.9, H         // 9.6, 14.5, H         // 9.1, 9.7, H         // 14.7, 9.5, H         // 7.9, 9.6, H         // 14.7, 9.7, H         // 9.45, 14.14, H         // 12.1, 9.14, H         // 7.5, 9, H         // 14.5, 14.5, H         // 9.45, 9.7, H         // 14.45, 9.6, H         // 9.5, 7.6, H         // 9, 9.45, H         // 14.7, 12, H         // 9.7, 9.7, H         // 9.6, 9, H         // 12, 9, H         // 9.45, 14.5, H         // 9.9, 14.6, H         // 12.7, 9.9, H         // 9, 12.14, H         // 9, 14.9, H         // 9.5, 9.7, H         // 9.7, 14.7, H         // 9.9, 14.5, H         // 14, 14.5, H         // 7.9, 9, H         // 9.9, 9.45, H         // 9, 14.14, H         // 14.7, 9.7, H         // 14.5, 9.9, H     </script> </body>   </html> |
Output:
Example2:
<!DOCTYPE html> <html lang="en">   <head>     <meta charset="UTF-8">     <meta name="viewport" content="         width=device-width, initial-scale=1.0">       <script type="text/javascript"    </script>     <script src=     </script> </head>   <body>     <h1 style="color:green">neveropen</h1>           <script>           // append the svg object to the body.         var svg = d3.select("body")         .append("svg")             .attr("width", 530)             .attr("height", 480)         .append("g")             .attr("transform",                 "translate(" + 40 + ", " + -80 + ")");           // read data         d3.csv("./data.csv", function(data) {                       var y = d3.scaleLinear()             .domain([2, 30])             .range([ 300, 100 ]);           var x = d3.scaleLinear()             .domain([2, 22])             .range([ 0, 200]);             svg.append("g")         .call(d3.axisLeft(y));                   svg.append("g")             .attr("transform", "translate(0, " + 300 + ")")             .call(d3.axisBottom(x));           var density= d3.contourDensity()             .y(function(d) { return y(d.y); })             .bandwidth(15)             // Use of weight function             .weight(48888)             .x(function(d) { return x(d.x); })(data)           svg.selectAll("path")             .data(density)             .enter()             .append("path")             .attr("d", d3.geoPath())             .attr("fill", "none")             .attr("stroke", "green")         });           // Data for csv file         // x, y, group         // 9.45, 14.14, H         // 9.1, 14.14, H         // 9.9, 9.9, H         // 9.6, 14.5, H         // 9.1, 9.7, H         // 14.7, 9.5, H         // 7.9, 9.6, H         // 14.7, 9.7, H         // 9.45, 14.14, H         // 12.1, 9.14, H         // 7.5, 9, H         // 14.5, 14.5, H         // 9.45, 9.7, H         // 14.45, 9.6, H         // 9.5, 7.6, H         // 9, 9.45, H         // 14.7, 12, H         // 9.7, 9.7, H         // 9.6, 9, H         // 12, 9, H         // 9.45, 14.5, H         // 9.9, 14.6, H         // 12.7, 9.9, H         // 9, 12.14, H         // 9, 14.9, H         // 9.5, 9.7, H         // 9.7, 14.7, H         // 9.9, 14.5, H         // 14, 14.5, H         // 7.9, 9, H         // 9.9, 9.45, H         // 9, 14.14, H         // 14.7, 9.7, H         // 14.5, 9.9, H     </script> </body>   </html> |
Output:
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