The d3.curveMonotoneY interpolator assumes that the data is sorted according to the y coordinates otherwise it sorts the data accordingly. This curve method produces a cubic spline that preserves monotonicity in x, assuming monotonicity in y.
Syntax:
d3.curveMonotoneY()
Parameters: This method does not accept any parameters.
Return Value: This method does not return any value.
Example 1:
HTML
<!DOCTYPE html> < html >
< head >
< script src =
</ script >
</ head >
< body >
< h1 style="text-align: center;
color: green;">
GeeksforGeeks
</ h1 >
< center >
< svg id = "gfg" width = "250" height = "250" >
</ svg >
</ center >
< script >
var data = [
{ x: 0, y: 0 },
{ x: 1, y: 3 },
{ x: 2, y: 15 },
{ x: 5, y: 1 },
{ x: 6, y: 15 },
{ x: 7, y: 5 },
{ x: 8, y: 19 }];
// Sorting the points by y axis
data.sort((a, b) => a.y - b.y);
var xScale = d3.scaleLinear()
.domain([0, 8])
.range([25, 200]);
var yScale = d3.scaleLinear()
.domain([0, 20])
.range([200, 25]);
var line = d3.line()
.x((d) => xScale(d.x))
.y((d) => yScale(d.y))
.curve(d3.curveMonotoneY);
d3.select("#gfg")
.append("path")
.attr("d", line(data))
.attr("fill", "none")
.attr("stroke", "green");
</ script >
</ body >
</ html >
|
Output:
Example 2: Sorting the unsorted points by the x-axis then rendering the curve.
HTML
<!DOCTYPE html> < html >
< head >
< script src =
</ script >
</ head >
< body >
< h1 style="text-align: center;
color: green;">
GeeksforGeeks
</ h1 >
< center >
< svg id = "gfg" width = "250" height = "200" >
</ svg >
</ center >
< script >
var points = [
{ xpoint: 75, ypoint: 150 },
{ xpoint: 25, ypoint: 5 },
{ xpoint: 150, ypoint: 150 },
{ xpoint: 100, ypoint: 5 },
{ xpoint: 200, ypoint: 150 }];
// Sorting the points by y axis
points.sort((a, b) => a.ypoint - b.ypoint);
var Gen = d3.line()
.x((p) => p.xpoint)
.y((p) => p.ypoint)
.curve(d3.curveMonotoneY);
d3.select("#gfg")
.append("path")
.attr("d", Gen(points))
.attr("fill", "none")
.attr("stroke", "green");
</ script >
</ body >
</ html >
|
Output: