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;"> 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 }]; // 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;"> 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: 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:
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