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 x coordinate of the first point.
Syntax:
d3.curveStepBefore()
Parameters: This method takes no parameters
Return Value: This method returns nothing.
Example 1:
HTML
<!DOCTYPE html><html><meta charset="utf-8"><head> <title>d3.curveStepBefore()</title></head><body> <h1 style="text-align: center; color: green;">neveropen</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)) // curveStepBefore is used .curve(d3.curveStepBefore);d3.select("#gfg") .append("path") .attr("d", line(data)) .attr("fill", "none") .attr("stroke", "green");// Defining pointsd3.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> <title>d3.curveStepBefore()</title></head><body> <h1 style="text-align: center; color: green;">neveropen</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.curveStepBefore);d3.select("#gfg") .append("path") .attr("d", Gen(points)) .attr("fill", "none") .attr("stroke", "green");// Defining pointsd3.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:
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