The areaRadial.defined() method in D3.js lets one specify whether data is defined for a given data point or not. The value is checked for each point using the boolean value or function specified as a parameter to this method. The checked value is kept if this method returns true, otherwise it is omitted.
Syntax:
areaRadial.defined( data_point )
Parameters: This function accepts a single parameter as mentioned above and described below:
- data_point: It is a boolean value or function that is used to check every point.
Return Value: This method returns a boolean value.
Below given are a few examples of areaRadial.defined() method in D3.js:
Example 1:
HTML
<!DOCTYPE html> <html> <head> <script src= </script> </head> <body> <h1 style="text-align: center; color: green;"> neveropen </h1> <h3 style="text-align: center;"> D3.js | areaRadial.defined() Method </h3> <center> <svg id="gfg" width="500" height="500"> <g transform="translate(180,180)"></g> </svg> </center> <script> var data = [ { x: 10, y: 1 }, { x: 15, y: 3 }, { x: 20, y: 5 }, { x: 25, y: 7 }, { x: 30, y: 9 }, { x: 35, y: 11 }, { x: 40, y: 13 }]; var xScale = d3.scaleLinear() .domain([0, 8]) .range([25, 200]); var yScale = d3.scaleLinear() .domain([0, 20]) .range([200, 25]); var Gen = d3.areaRadial() .angle(d => xScale(d.x / 3)) .innerRadius(d => yScale(d.y / 2)) .outerRadius(d => yScale(d.y)) // Omitting 4th index .defined((d, i) => (i != 4)); d3.select("#gfg") .select("g") .append("path") .attr("d", Gen(data)) .attr("fill", "green") .attr("stroke", "black"); </script> </body> </html> |
Output:
Example 2:
HTML
<!DOCTYPE html> <html> <head> <script src= </script> </head> <body> <h1 style="text-align: center; color: green;"> neveropen </h1> <h3 style="text-align: center;"> D3.js | areaRadial.defined() Method </h3> <center> <svg id="gfg" width="200" height="200"> <g transform="translate(100,100)"></g> </svg> </center> <script> var points = [ { x: 0, y: 0 }, { x: 2, y: 3 }, { x: 4, y: 1 }, { x: 6, y: 8 }, { x: 8, y: 17 }, { x: 10, y: 15 }, { x: 12, y: 20 }]; var xScale = d3.scaleLinear() .domain([0, 6]) .range([0, 2 * Math.PI]); var yScale = d3.scaleLinear() .domain([0, 20]) .range([90, 30]); var Gen = d3.areaRadial() .angle(d => xScale(d.x / 2)) .innerRadius(d => yScale(d.y) / 2) .outerRadius(d => yScale(d.y)) // Omitting 2nd index .defined((d, i) => (i != 2)); d3.select("#gfg") .select("g") .append("path") .attr("d", Gen(points)) .attr("fill", "green") .attr("stroke", "black"); </script> </body> </html> |
Output:
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