D3.js area.defined() Method
The d3.area.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.area.defined(data_point)
Parameters: This function accepts a single parameter as mentioned above and described below.
- data_point: This parameter is the data_point to be checked.
Return Value: This method returns a boolean value.
Example 1:
HTML
<!DOCTYPE html> < html > < head > < meta charset = "utf-8" > < script src = "https://cdnjs.cloudflare.com/ajax/libs/d3/4.2.2/d3.min.js" > </ script > </ head > < body > < h1 style = "text-align: center; color: green;" > w3wiki </ h1 > < h3 style = "text-align: center;" > D3.js | d3.area.defined() Method </ h3 > < center > < svg id = "gfg" width = "200" height = "200" > </ svg > </ center > < script > var data = [ {x: 50, y: 10}, {x: 150, y: 30}, {x: 200, y: 150}, {x: 250, y: 10}, {x: 300, y: 150}, {x: 350, y: 50}, {x: 400, y: 190}]; var xScale = d3.scaleLinear() .domain([0, 8]).range([25, 200]); var yScale = d3.scaleLinear() .domain([0,20]).range([200, 25]); var Gen = d3.area() .x((p) => p.x) .y0((p) => p.y*2) .y1((p) => p.y*4) // Excluding 3rd index .defined((d,i) => (i != 3)); d3.select("#gfg") .append("path") .attr("d", Gen(data)) .attr("fill", "green") .attr("stroke", "black"); </ script > </ body > </ html > |
Output:
Example 2:
HTML
<!DOCTYPE html> < html > < head > < meta charset = "utf-8" > < script src = "https://cdnjs.cloudflare.com/ajax/libs/d3/4.2.2/d3.min.js" > </ script > </ head > < body > < h1 style = "text-align: center; color: green;" > w3wiki </ h1 > < h3 style = "text-align: center;" > D3.js | d3.area.defined() Method </ h3 > < center > < svg id = "gfg" width = "250" height = "200" ></ svg > </ center > < script > var points = [ {xpoint: 25, ypoint: 150}, {xpoint: 75, ypoint: 50}, {xpoint: 100, ypoint: 150}, {xpoint: 100, ypoint: 50}, {xpoint: 200, ypoint: 150}]; var Gen = d3.area() .x((p) => p.xpoint) .y0((p) => p.ypoint/2) .y1((p) => p.ypoint) // Excluding 2nd index .defined((d,i) => (i != 2)); d3.select("#gfg") .append("path") .attr("d", Gen(points)) .attr("fill", "green") .attr("stroke", "black"); </ script > </ body > </ html > |
Output:
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