The d3.line.defined() method lets you specify whether there is data defined for a given data point or not. If this method returns false, this means that data point exists, else true.
Syntax:
d3.line.defined(data_point);
Parameters:
- data_point: data_point to be checked.
Return Value: This method returns a boolean value.
Example 1: In this example, we will omit some points using this method.
<!DOCTYPE html> <html> <meta charset="utf-8"> <head> <title>d3.line.defined()</title> </head> <script src= </script> <body> <h1 style="text-align: center; color: green;"> neveropen </h1> <center> <svg id="gfg" width="400" height="400"> </svg> </center> <script> var points = [ {xpoint: 25, ypoint: 150}, {xpoint: 75, ypoint: 85}, {xpoint: 100, ypoint: 115}, {xpoint: 125, ypoint: 55}, {xpoint: 150, ypoint: 105}, {xpoint: 175, ypoint: 25}, {xpoint: 200, ypoint: 155}, {xpoint: 225, ypoint: 15}, {xpoint: 250, ypoint: 135}, ]; var Gen = d3.line() .x((p) => p.xpoint) .y((p) => p.ypoint) .defined(((d, i) => i != 4)); d3.select("#gfg") .append("path") .attr("d", Gen(points)) .attr("fill", "none") .attr("stroke", "green"); </script> </body> </html> |
Output:
Example 2: In this example, we will omit null points using this method.
<!DOCTYPE html> <html> <meta charset="utf-8"> <head> <title>d3.line.defined()</title> </head> <script src= </script> <body> <h1 style="text-align: center; color: green;"> neveropen </h1> <center> <svg id="gfg" width="400" height="400"> </svg> </center> <script> var points = [ {xpoint: 25, ypoint: 150}, {xpoint: 75, ypoint: null}, {xpoint: 100, ypoint: 115}, {xpoint: 125, ypoint: 55}, {xpoint: 150, ypoint: null}, {xpoint: 175, ypoint: 25}, {xpoint: 200, ypoint: 155}, {xpoint: 225, ypoint: 15}, {xpoint: 250, ypoint: 135}, ]; var Gen = d3.line() .x((p) => p.xpoint) .y((p) => p.ypoint) .defined(function (d) { return d.ypoint !== null; }); d3.select("#gfg") .append("path") .attr("d", Gen(points)) .attr("fill", "none") .attr("stroke", "green"); </script> </body> </html> |
Output:
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