D3.js curveStep() 方法

阶跃曲线插值器创建表示阶跃函数的垂直和水平线。为数据集中的每对点创建一条垂直线。对于每对点，垂直线位于x坐标之间的中点。

句法：

d3.curveStep()

参数：此方法不接受任何参数

返回值：此方法不返回任何值。

示例 1：

HTML

  

    
    

  

    
        GeeksforGeeks
    
    
        
    
      
    
        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);
    

  

输出：

示例 2：

HTML

  

    
    

  

    
        GeeksforGeeks
    
    
        
    
      
    
        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);
    

  

输出：