D3.js curveStep() Method

Last Updated : 18 Sep, 2020

The step curve interpolator creates vertical and horizontal lines representing a step function. A vertical line is created for each pair of points in the dataset. For each pair of points, the vertical line is positioned at the midpoint between the x coordinate.

Syntax:

d3.curveStep()

Parameters: This method does not accept any parameters

Return Value: This method does not return any value.

Example 1:

HTML

<!DOCTYPE html>
<html>
<meta charset="utf-8">

<head>
    <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;">
        GeeksforGeeks
    </h1>
    <center>
        <svg id="gfg" width="200" height="200"></svg>
    </center>
    
    <script>
        var data = [
            { x: 0, y: 0 },
            { x: 1, y: 3 },
            { x: 2, y: 15 },
            { x: 5, y: 15 },
            { x: 6, y: 1 },
            { x: 7, y: 5 },
            { x: 8, y: 1 }];

        var xScale = d3.scaleLinear()
            .domain([0, 8]).range([25, 175]);
        var yScale = d3.scaleLinear()
            .domain([0, 20]).range([175, 25]);

        var line = d3.line()
            .x((d) => xScale(d.x))
            .y((d) => yScale(d.y))

            // curveStep is used
            .curve(d3.curveStep);

        d3.select("#gfg")
            .append("path")
            .attr("d", line(data))
            .attr("fill", "none")
            .attr("stroke", "green");

        // Defining points
        d3.select('#gfg')
            .selectAll('circle')
            .data(data)
            .enter()
            .append('circle')
            .attr('cx', (d) => xScale(d.x))
            .attr('cy', (d) => yScale(d.y))
            .attr('r', 3);
    </script>
</body>

</html>

Output:

Example 2:

HTML

<!DOCTYPE html>
<html>
<meta charset="utf-8">

<head>
    <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;">
        GeeksforGeeks
    </h1>
    <center>
        <svg id="gfg" width="200" height="200"></svg>
    </center>
    
    <script>
        var points = [
            { xpoint: 25, ypoint: 150 },
            { xpoint: 75, ypoint: 85 },
            { xpoint: 100, ypoint: 115 },
            { xpoint: 175, ypoint: 25 }];

        var Gen = d3.line()
            .x((p) => p.xpoint)
            .y((p) => p.ypoint)
            .curve(d3.curveStep);

        d3.select("#gfg")
            .append("path")
            .attr("d", Gen(points))
            .attr("fill", "none")
            .attr("stroke", "green");
            
        // Defining points
        d3.select('#gfg')
            .selectAll('circle')
            .data(points)
            .enter()
            .append('circle')
            .attr('cx', (d) => (d.xpoint))
            .attr('cy', (d) => (d.ypoint))
            .attr('r', 3);
    </script>
</body>

</html>

Output:

D3.js curveStepAfter() method

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D3.js curveStep() Method

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