The d3.curveMonotoneX interpolator assumes that the data is sorted according to the x coordinates otherwise sort the data accordingly. This curve method produces a cubic spline that preserves monotonicity in y, assuming monotonicity in x.
Syntax:
d3.curveMonotoneX()
Parameters: This method does not accept any parameters.
Return Value: This method does not return any value.
Example 1:Â
<!DOCTYPE html> <html>   <head>     <meta charset="utf-8">     <script src=     </script> </head>   <body>     <h1 style="text-align:center; color:green;">         neveropen     </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}];           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.curveMonotoneX);           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.
<!DOCTYPE html> <html>   <head>     <meta charset="utf-8">     <script src=     </script> </head>   <body>     <h1 style="text-align:center; color:green;">         neveropen     </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: 115},           {xpoint: 100, ypoint: 5},           {xpoint: 200, ypoint: 150}];           // Sorting the points by x axis         points.sort((a, b) => a.xpoint - b.xpoint);           var Gen = d3.line()           .x((p) => p.xpoint)           .y((p) => p.ypoint)           .curve(d3.curveMonotoneX);           d3.select("#gfg")           .append("path")           .attr("d", Gen(points))           .attr("fill", "none")           .attr("stroke", "green");       </script> </body> </html> |
Output:
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