The d3.area.y1() method is used to set the y1 accessor to the argument passed to it which may be either a number or a function that returns a number, this is the second point or our upper bounds.
Syntax:
d3.area.y1(y1_point)
Parameters: This function accepts a single parameter as mentioned above and described below.
- y1_point: This parameter is a number lower bound point or a function that returns a number.
Return Value: This method returns no value.
Example 1:
<!DOCTYPE html> <html> <head>     <meta charset="utf-8">       <script src=     </script> </head>   <body>     <h1 style="text-align: center; color: green;">         neveropen     </h1>       <h3 style="text-align: center;">         D3.js | d3.area.y1() Method     </h3>       <center>         <svg id="gfg" width="200" height="200">         </svg>     </center>       <script>         var data = [           {x: 50, y: 10},           {x: 150, y: 30},           {x: 200, y: 150},           {x: 250, y: 10},           {x: 300, y: 150},           {x: 350, y: 50},           {x: 400, y: 190}];           var xScale = d3.scaleLinear().domain([0, 8]).range([25, 200]);         var yScale = d3.scaleLinear().domain([0, 20]).range([200, 25]);           var Gen = d3.area()           .x((p) => p.x)           .y0((p) => p.y*2)           // Using area.y1() method           .y1((p) => p.y*4);           d3.select("#gfg")           .append("path")           .attr("d", Gen(data))           .attr("fill", "green")           .attr("stroke", "black");     </script> </body>   </html> |
Output:
Example 2:
<!DOCTYPE html> <html> <head>     <meta charset="utf-8">       <script src=     </script> </head> <body>     <h1 style="text-align: center; color: green;">         neveropen     </h1>       <h3 style="text-align: center;">         D3.js | d3.area.y1() Method     </h3>       <center>         <svg id="gfg" width="250" height="200">     </svg>     </center>       <script>         var points = [           {xpoint: 25, ypoint: 150},           {xpoint: 75, ypoint: 50},           {xpoint: 100, ypoint: 150},           {xpoint: 100, ypoint: 50},           {xpoint: 200, ypoint: 150}];             var Gen = d3.area()           .x((p) => p.xpoint)           .y0((p) => p.ypoint/2)           // Setting upper bounds           .y1((p) => p.ypoint);           d3.select("#gfg")           .append("path")           .attr("d", Gen(points))           .attr("fill", "green")           .attr("stroke", "black");       </script> </body>   </html> |
Output:
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